Inorganic or organic oxy acids of sulfur which contain the RSO2(OH) radical.
A reagent that is used to neutralize peptide terminal amino groups.
A class of organic compounds that contains a naphthalene moiety linked to a sulfonic acid salt or ester.
A class of organic compounds which contain an anilino (phenylamino) group linked to a salt or ester of naphthalenesulfonic acid. They are frequently used as fluorescent dyes and sulfhydryl reagents.
Inflammation of the COLON section of the large intestine (INTESTINE, LARGE), usually with symptoms such as DIARRHEA (often with blood and mucus), ABDOMINAL PAIN, and FEVER.
Sulfonic acid derivatives that are substituted with an aliphatic hydrocarbon group.
Compounds with a benzene ring fused to a thiazole ring.
Aminobenzenesulfonic acids. Organic acids that are used in the manufacture of dyes and organic chemicals and as reagents.
A chelating agent used as an antidote to heavy metal poisoning.
Organic esters or salts of sulfonic acid derivatives containing an aliphatic hydrocarbon radical.
A copper-containing oxidoreductase enzyme that catalyzes the oxidation of 4-benzenediol to 4-benzosemiquinone. It also has activity towards a variety of O-quinols and P-quinols. It primarily found in FUNGI and is involved in LIGNIN degradation, pigment biosynthesis and detoxification of lignin-derived products.
A plant genus of the family ASTERACEAE, order Asterales, subclass Asteridae. It is a source of costus root oil and should not be confused with the genus COSTUS.
Irritants and reagents for labeling terminal amino acid groups.
Measurement of the intensity and quality of fluorescence.
A hemeprotein from leukocytes. Deficiency of this enzyme leads to a hereditary disorder coupled with disseminated moniliasis. It catalyzes the conversion of a donor and peroxide to an oxidized donor and water. EC
Indolesulfonic acid used as a dye in renal function testing for the detection of nitrates and chlorates, and in the testing of milk.
Agents that emit light after excitation by light. The wave length of the emitted light is usually longer than that of the incident light. Fluorochromes are substances that cause fluorescence in other substances, i.e., dyes used to mark or label other compounds with fluorescent tags.
Oxy acids of sulfur with the general formula RSOH, where R is an alkyl or aryl group such as CH3. They are often encountered as esters and halides. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
An indole-dione that is obtained by oxidation of indigo blue. It is a MONOAMINE OXIDASE INHIBITOR and high levels have been found in urine of PARKINSONISM patients.
A plant genus of the family ASTERACEAE. Members contain SESQUITERPENES. The common name of sweet coltsfoot is similar to the common name for TUSSILAGO.
A thiol-containing non-essential amino acid that is oxidized to form CYSTINE.
Chemical agents that react with SH groups. This is a chemically diverse group that is used for a variety of purposes. Among these are enzyme inhibition, enzyme reactivation or protection, and labelling.
The insertion of drugs into the rectum, usually for confused or incompetent patients, like children, infants, and the very old or comatose.
A bicyclic monoterpene ketone found widely in plants, especially CINNAMOMUM CAMPHORA. It is used topically as a skin antipruritic and as an anti-infective agent.
Organic salts and esters of benzenesulfonic acid.
Liquid perfluorinated carbon compounds which may or may not contain a hetero atom such as nitrogen, oxygen or sulfur, but do not contain another halogen or hydrogen atom. This concept includes fluorocarbon emulsions and fluorocarbon blood substitutes.
Beta-Sulfoalanine. An amino acid with a C-terminal sulfonic acid group which has been isolated from human hair oxidized with permanganate. It occurs normally in the outer part of the sheep's fleece, where the wool is exposed to light and weather.
Lining of the INTESTINES, consisting of an inner EPITHELIUM, a middle LAMINA PROPRIA, and an outer MUSCULARIS MUCOSAE. In the SMALL INTESTINE, the mucosa is characterized by a series of folds and abundance of absorptive cells (ENTEROCYTES) with MICROVILLI.
Stable sulfur atoms that have the same atomic number as the element sulfur, but differ in atomic weight. S-33, 34, and 36 are stable sulfur isotopes.
A genus of gram-negative gliding bacteria found in SOIL; HUMUS; and FRESHWATER and marine habitats.
SESQUITERPENES cyclized into two adjoining cyclohexane rings but with a different configuration from the ARTEMISININS.
Chronic, non-specific inflammation of the GASTROINTESTINAL TRACT. Etiology may be genetic or environmental. This term includes CROHN DISEASE and ULCERATIVE COLITIS.
Substances that influence the course of a chemical reaction by ready combination with free radicals. Among other effects, this combining activity protects pancreatic islets against damage by cytokines and prevents myocardial and pulmonary perfusion injuries.
Long-chain polymer of glucose containing 17-20% sulfur. It has been used as an anticoagulant and also has been shown to inhibit the binding of HIV-1 to CD4-POSITIVE T-LYMPHOCYTES. It is commonly used as both an experimental and clinical laboratory reagent and has been investigated for use as an antiviral agent, in the treatment of hypolipidemia, and for the prevention of free radical damage, among other applications.
An antiseptic with mild fungistatic, bacteriostatic, anthelmintic, and amebicidal action. It is also used as a reagent and metal chelator, as a carrier for radio-indium for diagnostic purposes, and its halogenated derivatives are used in addition as topical anti-infective agents and oral antiamebics.
The rate dynamics in chemical or physical systems.
The normality of a solution with respect to HYDROGEN ions; H+. It is related to acidity measurements in most cases by pH = log 1/2[1/(H+)], where (H+) is the hydrogen ion concentration in gram equivalents per liter of solution. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)
Disruption of the non-covalent bonds and/or disulfide bonds responsible for maintaining the three-dimensional shape and activity of the native protein.
A chemical reaction in which an electron is transferred from one molecule to another. The electron-donating molecule is the reducing agent or reductant; the electron-accepting molecule is the oxidizing agent or oxidant. Reducing and oxidizing agents function as conjugate reductant-oxidant pairs or redox pairs (Lehninger, Principles of Biochemistry, 1982, p471).
A change from planar to elliptic polarization when an initially plane-polarized light wave traverses an optically active medium. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
Naturally occurring or experimentally induced animal diseases with pathological processes sufficiently similar to those of human diseases. They are used as study models for human diseases.
The characteristic 3-dimensional shape of a protein, including the secondary, supersecondary (motifs), tertiary (domains) and quaternary structure of the peptide chain. PROTEIN STRUCTURE, QUATERNARY describes the conformation assumed by multimeric proteins (aggregates of more than one polypeptide chain).
The sensory fibers innervating the viscera.
Small antigenic determinants capable of eliciting an immune response only when coupled to a carrier. Haptens bind to antibodies but by themselves cannot elicit an antibody response.
The transfer of energy of a given form among different scales of motion. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed). It includes the transfer of kinetic energy and the transfer of chemical energy. The transfer of chemical energy from one molecule to another depends on proximity of molecules so it is often used as in techniques to measure distance such as the use of FORSTER RESONANCE ENERGY TRANSFER.
The location of the atoms, groups or ions relative to one another in a molecule, as well as the number, type and location of covalent bonds.
Concentrated pharmaceutical preparations of plants obtained by removing active constituents with a suitable solvent, which is evaporated away, and adjusting the residue to a prescribed standard.
Processes involved in the formation of TERTIARY PROTEIN STRUCTURE.
Derivatives of caprylic acid. Included under this heading are a broad variety of acid forms, salts, esters, and amides that contain a carboxy terminated eight carbon aliphatic structure.
A strong organic base existing primarily as guanidium ions at physiological pH. It is found in the urine as a normal product of protein metabolism. It is also used in laboratory research as a protein denaturant. (From Martindale, the Extra Pharmacopoeia, 30th ed and Merck Index, 12th ed) It is also used in the treatment of myasthenia and as a fluorescent probe in HPLC.
A strain of albino rat used widely for experimental purposes because of its calmness and ease of handling. It was developed by the Sprague-Dawley Animal Company.
The parts of a macromolecule that directly participate in its specific combination with another molecule.
Naturally occurring or synthetic substances that inhibit or retard the oxidation of a substance to which it is added. They counteract the harmful and damaging effects of oxidation in animal tissues.
Substances used for the detection, identification, analysis, etc. of chemical, biological, or pathologic processes or conditions. Indicators are substances that change in physical appearance, e.g., color, at or approaching the endpoint of a chemical titration, e.g., on the passage between acidity and alkalinity. Reagents are substances used for the detection or determination of another substance by chemical or microscopical means, especially analysis. Types of reagents are precipitants, solvents, oxidizers, reducers, fluxes, and colorimetric reagents. (From Grant & Hackh's Chemical Dictionary, 5th ed, p301, p499)
Stable oxygen atoms that have the same atomic number as the element oxygen, but differ in atomic weight. O-17 and 18 are stable oxygen isotopes.
An alkylating sulfhydryl reagent. Its actions are similar to those of iodoacetate.
Compounds containing the -SH radical.
A conditionally essential nutrient, important during mammalian development. It is present in milk but is isolated mostly from ox bile and strongly conjugates bile acids.
A silver metallic element that exists as a liquid at room temperature. It has the atomic symbol Hg (from hydrargyrum, liquid silver), atomic number 80, and atomic weight 200.59. Mercury is used in many industrial applications and its salts have been employed therapeutically as purgatives, antisyphilitics, disinfectants, and astringents. It can be absorbed through the skin and mucous membranes which leads to MERCURY POISONING. Because of its toxicity, the clinical use of mercury and mercurials is diminishing.
An analytical method used in determining the identity of a chemical based on its mass using mass analyzers/mass spectrometers.
Measurement of the polarization of fluorescent light from solutions or microscopic specimens. It is used to provide information concerning molecular size, shape, and conformation, molecular anisotropy, electronic energy transfer, molecular interaction, including dye and coenzyme binding, and the antigen-antibody reaction.
A polyanionic compound with an unknown mechanism of action. It is used parenterally in the treatment of African trypanosomiasis and it has been used clinically with diethylcarbamazine to kill the adult Onchocerca. (From AMA Drug Evaluations Annual, 1992, p1643) It has also been shown to have potent antineoplastic properties.
One of the three polypeptide chains that make up the TROPONIN complex of skeletal muscle. It is a calcium-binding protein.
The property of objects that determines the direction of heat flow when they are placed in direct thermal contact. The temperature is the energy of microscopic motions (vibrational and translational) of the particles of atoms.
Benzene derivatives that include one or more hydroxyl groups attached to the ring structure.
The facilitation of a chemical reaction by material (catalyst) that is not consumed by the reaction.
The process in which substances, either endogenous or exogenous, bind to proteins, peptides, enzymes, protein precursors, or allied compounds. Specific protein-binding measures are often used as assays in diagnostic assessments.
An essential amino acid that is necessary for normal growth in infants and for NITROGEN balance in adults. It is a precursor of INDOLE ALKALOIDS in plants. It is a precursor of SEROTONIN (hence its use as an antidepressant and sleep aid). It can be a precursor to NIACIN, albeit inefficiently, in mammals.
A strong oxidizing agent used in aqueous solution as a ripening agent, bleach, and topical anti-infective. It is relatively unstable and solutions deteriorate over time unless stabilized by the addition of acetanilide or similar organic materials.
Inflammation of the COLON that is predominantly confined to the MUCOSA. Its major symptoms include DIARRHEA, rectal BLEEDING, the passage of MUCUS, and ABDOMINAL PAIN.
The class of all enzymes catalyzing oxidoreduction reactions. The substrate that is oxidized is regarded as a hydrogen donor. The systematic name is based on donor:acceptor oxidoreductase. The recommended name will be dehydrogenase, wherever this is possible; as an alternative, reductase can be used. Oxidase is only used in cases where O2 is the acceptor. (Enzyme Nomenclature, 1992, p9)
Domesticated bovine animals of the genus Bos, usually kept on a farm or ranch and used for the production of meat or dairy products or for heavy labor.
Compounds formed by the joining of smaller, usually repeating, units linked by covalent bonds. These compounds often form large macromolecules (e.g., BIOPOLYMERS; PLASTICS).
A compound formed in the liver from ammonia produced by the deamination of amino acids. It is the principal end product of protein catabolism and constitutes about one half of the total urinary solids.
A phylum of fungi that produce their sexual spores (basidiospores) on the outside of the basidium. It includes forms commonly known as mushrooms, boletes, puffballs, earthstars, stinkhorns, bird's-nest fungi, jelly fungi, bracket or shelf fungi, and rust and smut fungi.
The property of emitting radiation while being irradiated. The radiation emitted is usually of longer wavelength than that incident or absorbed, e.g., a substance can be irradiated with invisible radiation and emit visible light. X-ray fluorescence is used in diagnosis.
The order of amino acids as they occur in a polypeptide chain. This is referred to as the primary structure of proteins. It is of fundamental importance in determining PROTEIN CONFORMATION.
The species Oryctolagus cuniculus, in the family Leporidae, order LAGOMORPHA. Rabbits are born in burrows, furless, and with eyes and ears closed. In contrast with HARES, rabbits have 22 chromosome pairs.
A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain.
Proteins prepared by recombinant DNA technology.
The level of protein structure in which regular hydrogen-bond interactions within contiguous stretches of polypeptide chain give rise to alpha helices, beta strands (which align to form beta sheets) or other types of coils. This is the first folding level of protein conformation.
The relationship between the chemical structure of a compound and its biological or pharmacological activity. Compounds are often classed together because they have structural characteristics in common including shape, size, stereochemical arrangement, and distribution of functional groups.
Liquid chromatographic techniques which feature high inlet pressures, high sensitivity, and high speed.
Highly reactive molecules with an unsatisfied electron valence pair. Free radicals are produced in both normal and pathological processes. They are proven or suspected agents of tissue damage in a wide variety of circumstances including radiation, damage from environment chemicals, and aging. Natural and pharmacological prevention of free radical damage is being actively investigated.
A species of gram-negative, facultatively anaerobic, rod-shaped bacteria (GRAM-NEGATIVE FACULTATIVELY ANAEROBIC RODS) commonly found in the lower part of the intestine of warm-blooded animals. It is usually nonpathogenic, but some strains are known to produce DIARRHEA and pyogenic infections. Pathogenic strains (virotypes) are classified by their specific pathogenic mechanisms such as toxins (ENTEROTOXIGENIC ESCHERICHIA COLI), etc.
A reagent commonly used in biochemical studies as a protective agent to prevent the oxidation of SH (thiol) groups and for reducing disulphides to dithiols.
Elements of limited time intervals, contributing to particular results or situations.
Substances that reduce or suppress INFLAMMATION.
Determination of the spectra of ultraviolet absorption by specific molecules in gases or liquids, for example Cl2, SO2, NO2, CS2, ozone, mercury vapor, and various unsaturated compounds. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The extent to which an enzyme retains its structural conformation or its activity when subjected to storage, isolation, and purification or various other physical or chemical manipulations, including proteolytic enzymes and heat.
Descriptions of specific amino acid, carbohydrate, or nucleotide sequences which have appeared in the published literature and/or are deposited in and maintained by databanks such as GENBANK, European Molecular Biology Laboratory (EMBL), National Biomedical Research Foundation (NBRF), or other sequence repositories.
The relationship between the dose of an administered drug and the response of the organism to the drug.
The art or process of comparing photometrically the relative intensities of the light in different parts of the spectrum.
Spectroscopic method of measuring the magnetic moment of elementary particles such as atomic nuclei, protons or electrons. It is employed in clinical applications such as NMR Tomography (MAGNETIC RESONANCE IMAGING).
Models used experimentally or theoretically to study molecular shape, electronic properties, or interactions; includes analogous molecules, computer-generated graphics, and mechanical structures.
An order of fungi in the phylum BASIDIOMYCOTA having macroscopic basidiocarps. The members are characterized by their saprophytic activities as decomposers, particularly in the degradation of CELLULOSE and LIGNIN. A large number of species in the order have been used medicinally. (From Alexopoulos, Introductory Mycology, 4th ed, pp504-68)
Non-antibody proteins secreted by inflammatory leukocytes and some non-leukocytic cells, that act as intercellular mediators. They differ from classical hormones in that they are produced by a number of tissue or cell types rather than by specialized glands. They generally act locally in a paracrine or autocrine rather than endocrine manner.
The section of the alimentary canal from the STOMACH to the ANAL CANAL. It includes the LARGE INTESTINE and SMALL INTESTINE.
A characteristic feature of enzyme activity in relation to the kind of substrate on which the enzyme or catalytic molecule reacts.
Use of plants or herbs to treat diseases or to alleviate pain.
Artificial, single or multilaminar vesicles (made from lecithins or other lipids) that are used for the delivery of a variety of biological molecules or molecular complexes to cells, for example, drug delivery and gene transfer. They are also used to study membranes and membrane proteins.
A basic science concerned with the composition, structure, and properties of matter; and the reactions that occur between substances and the associated energy exchange.
Chromatography on thin layers of adsorbents rather than in columns. The adsorbent can be alumina, silica gel, silicates, charcoals, or cellulose. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)
The composition, conformation, and properties of atoms and molecules, and their reaction and interaction processes.
The endogenous compounds that mediate inflammation (AUTACOIDS) and related exogenous compounds including the synthetic prostaglandins (PROSTAGLANDINS, SYNTHETIC).
A disturbance in the prooxidant-antioxidant balance in favor of the former, leading to potential damage. Indicators of oxidative stress include damaged DNA bases, protein oxidation products, and lipid peroxidation products (Sies, Oxidative Stress, 1991, pxv-xvi).
An essential amino acid. It is often added to animal feed.
Organic compounds that generally contain an amino (-NH2) and a carboxyl (-COOH) group. Twenty alpha-amino acids are the subunits which are polymerized to form proteins.
Serum glycoprotein produced by activated MACROPHAGES and other mammalian MONONUCLEAR LEUKOCYTES. It has necrotizing activity against tumor cell lines and increases ability to reject tumor transplants. Also known as TNF-alpha, it is only 30% homologous to TNF-beta (LYMPHOTOXIN), but they share TNF RECEPTORS.
A rigorously mathematical analysis of energy relationships (heat, work, temperature, and equilibrium). It describes systems whose states are determined by thermal parameters, such as temperature, in addition to mechanical and electromagnetic parameters. (From Hawley's Condensed Chemical Dictionary, 12th ed)
A mass spectrometry technique used for analysis of nonvolatile compounds such as proteins and macromolecules. The technique involves preparing electrically charged droplets from analyte molecules dissolved in solvent. The electrically charged droplets enter a vacuum chamber where the solvent is evaporated. Evaporation of solvent reduces the droplet size, thereby increasing the coulombic repulsion within the droplet. As the charged droplets get smaller, the excess charge within them causes them to disintegrate and release analyte molecules. The volatilized analyte molecules are then analyzed by mass spectrometry.
A technique applicable to the wide variety of substances which exhibit paramagnetism because of the magnetic moments of unpaired electrons. The spectra are useful for detection and identification, for determination of electron structure, for study of interactions between molecules, and for measurement of nuclear spins and moments. (From McGraw-Hill Encyclopedia of Science and Technology, 7th edition) Electron nuclear double resonance (ENDOR) spectroscopy is a variant of the technique which can give enhanced resolution. Electron spin resonance analysis can now be used in vivo, including imaging applications such as MAGNETIC RESONANCE IMAGING.

Respiratory chain strongly oxidizes the CXXC motif of DsbB in the Escherichia coli disulfide bond formation pathway. (1/630)

Escherichia coli DsbB has four essential cysteine residues, among which Cys41 and Cys44 form a CXXC redox active site motif and the Cys104-Cys130 disulfide bond oxidizes the active site cysteines of DsbA, the disulfide bond formation factor in the periplasm. Functional respiratory chain is required for the cell to keep DsbA oxidized. In this study, we characterized the roles of essential cysteines of DsbB in the coupling with the respiratory chain. Cys104 was found to form the inactive complex with DsbA under respiration-defective conditions. While DsbB, under normal aerobic conditions, is in the oxidized state, having two intramolecular disulfide bonds, oxidation of Cys104 and Cys130 requires the presence of Cys41-Cys44. Remarkably, the Cys41-Cys44 disulfide bond is refractory to reduction by a high concentration of dithiothreitol, unless the membrane is solubilized with a detergent. This reductant resistance requires both the respiratory function and oxygen, since Cys41-Cys44 became sensitive to the reducing agent when membrane was prepared from quinone- or heme-depleted cells or when a membrane sample was deaerated. Thus, the Cys41-Val-Leu-Cys44 motif of DsbB is kept both strongly oxidized and strongly oxidizing when DsbB is integrated into the membrane with the normal set of respiratory components.  (+info)

ApoB100 secretion from HepG2 cells is decreased by the ACAT inhibitor CI-1011: an effect associated with enhanced intracellular degradation of ApoB. (2/630)

The concept that hepatic cholesteryl ester (CE) mass and the rate of cholesterol esterification regulate hepatocyte assembly and secretion of apoB-containing lipoproteins remains controversial. The present study was carried out in HepG2 cells to correlate the rate of cholesterol esterification and CE mass with apoB secretion by CI-1011, an acyl CoA:cholesterol acyltransferase (ACAT) inhibitor that is known to decrease apoB secretion, in vivo, in miniature pigs. HepG2 cells were incubated with CI-1011 (10 nmol/L, 1 micromol/L, and 10 micromol/L) for 24 hours. ApoB secretion into media was decreased by 25%, 27%, and 43%, respectively (P<0.0012). CI-1011 (10 micromol/L) inhibited HepG2 cell ACAT activity by 79% (P<0.002) and cellular CE mass by 32% (P<0.05). In contrast, another ACAT inhibitor, DuP 128 (10 micromol/L), decreased cellular ACAT activity and CE mass by 85% (P<0.002) and 42% (P=0.01), respectively, but had no effect on apoB secretion into media. To characterize the reduction in apoB secretion by CI-1011, pulse-chase experiments were performed and analyzed by multicompartmental modelling using SAAM II. CI-1011 did not affect the synthesis of apoB or albumin. However, apoB secretion into the media was decreased by 42% (P=0.019). Intracellular apoB degradation increased proportionately (P=0.019). The secretion of albumin and cellular reuptake of labeled lipoproteins were unchanged. CI-1011 and DuP 128 did not affect apoB mRNA concentrations. These results show that CI-1011 decreases apoB secretion by a mechanism that involves an enhanced intracellular degradation of apoB. This study demonstrates that ACAT inhibitors can exert differential effects on apoB secretion from HepG2 cells that do not reflect their efficacy in inhibiting cholesterol esterification.  (+info)

Anaerobic oxidations of cysteate: degradation via L-cysteate:2-oxoglutarate aminotransferase in Paracoccus pantotrophus. (3/630)

Anoxic, fresh-water enrichment cultures to oxidize different organosulfonates were set up with nitrate, ferric iron or sulfate as electron acceptors. Pure cultures were easily obtained with two naturally occurring sulfonates, cysteate (2-amino-3-sulfopropionate) and taurine (2-aminoethanesulfonate), under nitrate-reducing conditions. These two sulfonates were also oxidized during reduction of iron(III), though isolation of pure cultures was not successful. One nitrate-reducing cysteate-oxidizing bacterium, strain NKNCYSA, was studied in detail. It was identified as Paracoccus pantotrophus. Eighteen sulfonates were tested, and the organism degraded cysteate, taurine, isethionate (2-hydroxyethanesulfonate), sulfoacetate or 3-aminopropanesulfonate with concomitant reduction of nitrate, presumably to molecular nitrogen. The carbon skeleton of these substrates was converted to cell material and, presumably, CO2. The amino group was released as ammonia and the sulfono moiety was recovered as sulfate. Cell-free extracts of P. pantotrophus NKNCYSA contained constitutive L-cysteate:2-oxoglutarate aminotransferase (EC 2.6.1.-) and glutamate dehydrogenase (EC Taurine:pyruvate aminotransferase, in contrast, was inducible.  (+info)

Modulation of fibroblast growth factor-2 receptor binding, signaling, and mitogenic activity by heparin-mimicking polysulfonated compounds. (4/630)

Basic fibroblast growth factor (FGF-2) interacts with high-affinity tyrosine-kinase fibroblast growth factor receptors (FGFRs) and low-affinity heparan sulfate proteoglycans (HSPGs) in target cells. Both interactions are required for FGF-2-mediated biological responses. Here we report the FGF-2 antagonist activity of novel synthetic sulfonic acid polymers with distinct chemical structures and molecular masses (MMs). PAMPS [poly(2-acrylamido-2-methyl-1-propanesulfonic acid)], (MM approximately 7,000-10,000), PAS [poly(anetholesulfonic acid)], (MM approximately 9,000-11,000), PSS [poly(4-styrenesulfonic acid)], (MM = 70,000), and poly(vinylsulfonic acid) (MM = 2,000), inhibited FGF-2 binding to HSPGs and FGFRs in fetal bovine aortic endothelial GM 7373 cells. They also abrogated the formation of the HSPG/FGF-2/FGFR ternary complex, as evidenced by their capacity to prevent FGF-2-mediated cell-cell attachment of FGFR-1-overexpressing, HSPG-deficient Chinese hamster ovary cells to wild-type HSPG-bearing cells. Direct interaction of the polysulfonates with FGF-2 was demonstrated by their ability to protect the growth factor from proteolytic cleavage. Accordingly, molecular modeling, based on the crystal structure of the interaction of FGF-2 with a heparin hexamer, showed the feasibility of docking PAMPS into the heparin-binding domain of FGF-2. In agreement with their FGF-2-binding capacity, PSS, PAS, and PAMPS inhibited FGF-2-induced cell proliferation in GM 7373 cells and murine brain microvascular endothelial cells. The antiproliferative activity of these compounds was associated with the abrogation of FGF-2-induced tyrosine phosphorylation of FGFR-1. Moreover, the polysulfonates PSS and PAS inhibited FGF-2-induced activation of mitogen-activated protein kinase-1/2, involved in FGF-2 signal transduction. In conclusion, sulfonic acid polymers bind FGF-2 by mimicking heparin interaction. These compounds may provide a tool to inhibit FGF-2-induced endothelial cell proliferation in angiogenesis and tumor growth.  (+info)

Inhibition of ACAT by avasimibe decreases both VLDL and LDL apolipoprotein B production in miniature pigs. (5/630)

An orally bioavailable acyl coenzyme A:cholesterol acyltransferase (ACAT) inhibitor, avasimibe (CI-1011), was used to test the hypothesis that inhibition of cholesterol esterification, in vivo, would reduce hepatic very low density (VLDL) apolipoprotein (apo) B secretion into plasma. ApoB kinetic studies were carried out in 10 control miniature pigs, and in 10 animals treated with avasimibe (10 mg/kg/d, n = 6; 25 mg/kg/d, n = 4). Pigs were fed a diet containing fat (34% of calories) and cholesterol (400 mg/d; 0.1%). Avasimibe decreased the plasma concentrations of total triglyceride, VLDL triglyceride, and VLDL cholesterol by 31;-40% 39-48%, and 31;-35%, respectively. Significant reductions in plasma total cholesterol (35%) and low density lipoprotein (LDL) cholesterol (51%) concentrations were observed only with high dose avasimibe. Autologous 131I-labeled VLDL, 125I-labeled LDL, and [3H]leucine were injected simultaneously into each pig and apoB kinetic data were analyzed using multicompartmental analysis (SAAM II). Avasimibe decreased the VLDL apoB pool size by 40;-43% and the hepatic secretion rate of VLDL apoB by 38;-41%, but did not alter its fractional catabolism. Avasimibe decreased the LDL apoB pool size by 13;-57%, largely due to a dose-dependent 25;-63% in the LDL apoB production rate. Hepatic LDL receptor mRNA abundances were unchanged, consistent with a marginal decrease in LDL apoB FCRs. Hepatic ACAT activity was decreased by 51% (P = 0.050) and 68% (P = 0.087) by low and high dose avasimibe, respectively. The decrease in total apoB secretion correlated with the decrease in hepatic ACAT activity (r = 0.495; P = 0.026). We conclude that inhibition of hepatic ACAT by avasimibe reduces both plasma VLDL and LDL apoB concentrations, primarily by decreasing apoB secretion.  (+info)

Low-molecular-weight sulfonates, a major substrate for sulfate reducers in marine microbial mats. (6/630)

Several low-molecular-weight sulfonates were added to microbial mat slurries to investigate their effects on sulfate reduction. Instantaneous production of sulfide occurred after taurine and cysteate were added to all of the microbial mats tested. The rates of production in the presence of taurine and cysteate were 35 and 24 microM HS(-) h(-1) in a stromatolite mat, 38 and 36 microM HS(-) h(-1) in a salt pond mat, and 27 and 18 microM HS(-) h(-1) in a salt marsh mat, respectively. The traditionally used substrates lactate and acetate stimulated the rate of sulfide production 3 to 10 times more than taurine and cysteate stimulated the rate of sulfide production in all mats, but when ethanol, glycolate, and glutamate were added to stromatolite mat slurries, the resulting increases were similar to the increases observed with taurine and cysteate. Isethionate, sulfosuccinate, and sulfobenzoate were tested only with the stromatolite mat slurry, and these compounds had much smaller effects on sulfide production. Addition of molybdate resulted in a greater inhibitory effect on acetate and lactate utilization than on sulfonate use, suggesting that different metabolic pathways were involved. In all of the mats tested taurine and cysteate were present in the pore water at nanomolar to micromolar concentrations. An enrichment culture from the stromatolite mat was obtained on cysteate in a medium lacking sulfate and incubated anaerobically. The rate of cysteate consumption by this enrichment culture was 1.6 pmol cell(-1) h(-1). Compared to the results of slurry studies, this rate suggests that organisms with properties similar to the properties of this enrichment culture are a major constituent of the sulfidogenic population. In addition, taurine was consumed at some of highest dilutions obtained from most-probable-number enrichment cultures obtained from stromatolite samples. Based on our comparison of the sulfide production rates found in various mats, low-molecular-weight sulfonates are important sources of C and S in these ecosystems.  (+info)

Antioxidant activity: what do we measure? (7/630)

Inhibition of oxidation of 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) by free radicals generated by decomposition of 2,2'-azobis(2-amidopropane) (ABAP) by antioxidants and biological material was studied. A correlation was found between the ability of various substances to delay the onset of ABTS oxidation and their rapid reduction of the ABTS+* cation radical, and between the ability to reduce the maximal rate of ABTS oxidation and slow reduction of ABTS+*. The length of the lag period of ABTS oxidation was found to be independent of ABTS concentration. Similar decrease of peroxynitrite-induced ABTS+* formation by antioxidants was observed when the antioxidants were added before and after peroxynitrite. All these findings indicate that the main effect of antioxidants in this system is reduction of ABTS+* and not prevention of its formation. Reduction of oxidation products rather than inhibition of their formation may be the predominant mode of action of antioxidants in various assays of antioxidant activity.  (+info)

Malaria vectors in a traditional dry zone village in Sri Lanka. (8/630)

Malaria transmission by anopheline mosquitoes was studied in a traditional tank-irrigation-based rice-producing village in the malaria-endemic low country dry zone of northcentral Sri Lanka during the period August 1994-February 1997. Adult mosquitoes were collected from human and bovid bait catches, bovid-baited trap huts, indoor catches, and pit traps. Mosquito head-thoraces were tested for the presence of Plasmodium falciparum and P. vivax, and blood-engorged abdomens for the presence of human blood by ELISAs. House surveys were done at two-day intervals to record cases of blood film-confirmed malaria among the villagers. A total of 7,823 female anophelines representing 14 species were collected. Trends in anopheline abundance were significantly correlated with rainfall of the preceding month in An. annularis, An. barbirostris, An. subpictus, An. vagus, and An. varuna, but were not significant in An. culicifacies and An. peditaeniatus. Malaria parasite infections were seen in seven mosquito species, with 75% of the positive mosquitoes containing P. falciparum and 25% P. vivax. Polymorph PV247 was recorded from a vector (i.e., An. varuna) for the first time in Sri Lanka. Computations of mean number of infective vector (MIV) rates using abundance, circumsporozoite (CS) protein rate, and human blood index (HBI) showed the highest rate in An. culicifacies. A malaria outbreak occurred from October 1994 to January 1995 in which 45.5% of village residents experienced at least a single disease episode. Thereafter, malaria incidence remained low. Anopheles culicifacies abundance lagged by one month correlated positively with monthly malaria incidence during the outbreak period, and although this species ranked fifth in terms of abundance, infection was associated with a high MIV rate due to a high CS protein rate and HBI. Abundance trends in other species did not correlate significantly with malaria. It was concluded that An. culicifacies was epidemiologically the most important vector in the study area.  (+info)

Glioblastoma is the most common primary brain tumor in adults and one of its hallmarks is resistance to apoptosis. Acyl-CoA: cholesterol acyltransferase (ACAT) is an intracellular membrane-bound enzyme that uses cholesterol and long chain fatty acyl-CoA as substrates to produce cholesteryl esters. T …
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Sulfamoylation of 2-methoxyestrone (2-MeOE1) was shown previously to enhance its potency as an anti-proliferative agent against breast cancer cells. We have examined the ability of a series of 2-methoxyestradiol (2-MeOE2) and 2-ethylestradiol (2-EtE2) sulfamates to inhibit angiogenesis in vitro. 2-MeOE2 bis-sulfamate and 2-EtE2 sulfamate were potent inhibitors of human umbilical vein endothelial cell (HUVEC) proliferation with IC(50) values of 0.05 microM and 0.01 microM, respectively. A novel co-culture system, in which endothelial cells were cultured in a matrix of human dermal fibroblasts, was also used to assess the anti-angiogenic potential of these drugs. In this system endothelial cells proliferate and migrate through the culture matrix to form tubule structures. Whereas 2-MeOE2 (1.0 microM) caused a small reduction in tubule formation, both 2-MeOE2 bis-sulfamate (0.1 microM) and 2-EtE2 sulfamate (0.1 microM) almost completely abolished tubule formation. 2-MeOE2 bis-sulfamate and 2-EtE2 sulfamate
2,2-Azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) is a peroxidase substrate suitable for use in ELISA procedures. This substrate produces a soluble end product that is green in color and can be read spectrophotometrically at 405 nm. The reaction may be stopped with 1% sodium dodecyl sulfate (SDS). Recommended for ELISA (microwell) procedures, not recommended for membrane applications ...
The Acute and Chronic Effects of Standard Sodium Alkyl Benzene Sulfonate Upon the Pumpkinseed Sunfish, Lepomis gibbosus (Linn.) and the Bluegill Sunfish L. macrochirus Raf. J. CAIRNS, JR., Curator and A. SCHEIER, Biologist Department of Limnology Academy of Natural Sciences Philadelphia, Pennsylvania A number of comparatively recent publications have noted the striking expansion in use of synthetic detergents which has occurred in the past 12 years (1,2,3,4,5). The most common active agent in these detergents is alkyl benzene sulfonate (ABS); Vaughn (5) and Hammerton (6) have indicated that synthetic detergents occur persistently in a variety of natural waters. Thus, it is quite likely that fish and other aquatic organisms will be continuously exposed to these materials except in areas quite remote from civiliza - tion. The purpose of the experiments reported in this paper was to determine the chronic or long-term effects of sublethal concentrations of ABS upon the ability of sunfish to ...
Chemicals China, Sdbs Sodium Dodecyl Benzene Sulfonate Factory Supplier, SDBS ( sodium dodecyl benzene sulfonate) Appearance: white or light yellow powder Type: LAS- 60, LAS- 70, LAS- 80, LAS- ...
Sodium dodecyl benzene sulfonate powder (LAS) is a high content anionic surfactant with properties of detergency, moistening, foaming, emulsifying and disp
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A derivative of rapamycin of general formula (I) ##STR1## where R1 is alkyl, alkenyl, or alkynyl containing 1 to 6 carbon atoms; or an aromatic moiety selected from the group consisting of phenyl and naphthyl or a heterocyclic moiety selected from the group consisting of thiophenyl and quinolinyl or NHCO2 R2 wherein R2 is lower alkyl containing 1 to 6 carbon atoms or a pharmaceutically acceptable salt thereof, which by virtue of its immunosuppressive activity is useful in treating transplantation rejection, host versus graft disease, autoimmune diseases, and diseases of inflammation.
94349-56-1 - SHUSBRIWJQXMNB-XGMLEZCSSA-N - Adenosine, adenylyl-(3.5)-adenylyl-(3.5)-, diammonium salt - Similar structures search, synonyms, formulas, resource links, and other chemical information.
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The new antitumor sulfamate EMD 486019 was investigated for its interaction with twelve catalytically active mammalian carbonic anhydrase (CA, EC isozymes, hCA I - XIV. Similarly to 667-Coumate, a structurally related compound in phase II clinical trials as steroid sulfatase/CA inhibitor with potent antitumor properties, EMD 486019 acts as a strong inhibitor of isozymes CA II, VB, VII, IX, XII, and XIV (K(I)s in the range of 13-19nM) being less effective against other isozymes (K(I)s in the range of 66-3600nM against hCA I, IV, VA, VI, and mCA XIII, respectively). The complete inhibition profile of 667-Coumate against these mammalian CAs is also reported here for the first time. Comparing the X-ray crystal structures of the two adducts of CA II with EMD 486019 and 667-Coumate, distinct orientations of the bound sulfamates within the enzyme cavity were observed, which account for their distinct inhibition profiles. CA II/IX potent inhibitors belonging to the sulfamate class are thus ...
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Find quality suppliers and manufacturers of 68201-32-1(Asphalt,sulfonated, sodium salt) for price inquiry. where to buy 68201-32-1(Asphalt,sulfonated, sodium salt).Also offer free database of 68201-32-1(Asphalt,sulfonated, sodium salt) including MSDS sheet(poisoning, toxicity, hazards and safety),chemical properties,Formula, density and structure, solution etc.
The esterification of glycerol with lauric and oleic acids (1 : 1 molar ratio) has been carried out by using hybrid MCM-41 materials containing simultaneously alkyl (methyl or propyl) and sulfonic acid groups as catalysts. It has been found that for each fatty acid the catalyst activity is affected by the concentration of methyl groups, and maximum activity per sulfonic acid group is achieved by tuning the methyl/sulfonic acid ratio. A monolaurin yield of 63% is obtained with the most active catalyst, whereas for oleic acid the maximum monoolein yield was 45%. Reduction of the average pore size (determined by N2 adsorption) from 14 to below 10 Å has a detrimental influence on the catalyst activity for both acids ...
1-AMINO-2-NAPHTHOL-4-SULFONIC ACID 567-13-5 NMR spectrum, 1-AMINO-2-NAPHTHOL-4-SULFONIC ACID H-NMR spectral analysis, 1-AMINO-2-NAPHTHOL-4-SULFONIC ACID C-NMR spectral analysis ect.
2,4-Dimethylaniline-6-sulfonic acid chemical properties, What are the chemical properties of 2,4-Dimethylaniline-6-sulfonic acid 88-22-2, What are the physical properties of 2,4-Dimethylaniline-6-sulfonic acid ect.
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TY - JOUR. T1 - Antioxidant and anti-inflammatory properties of cancer preventive peptide lunasin in RAW 264.7 macrophages. AU - Hernández-Ledesma, Blanca. AU - Hsieh, Chia Chien. AU - de Lumen, Ben O.. PY - 2009/12/18. Y1 - 2009/12/18. N2 - Oxidative stress and inflammation are two of the most critical factors implicated in carcinogenesis and other degenerative disorders. We have investigated how lunasin, a known anti-cancer seed peptide, affect these factors. This peptide inhibits linoleic acid oxidation and acts as 2,2′-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium salt (ABTS) radical scavenger. Furthermore, using LPS-stimulated RAW 264.7 macrophages, we have demonstrated that lunasin reduces, in a significant dose-dependent manner, the production of reactive oxygen species (ROS) by LPS-induced macrophages. Lunasin also inhibits the release of pro-inflammatory cytokines (tumor necrosis factor-α [TNF-α] and interleukine-6 [IL-6]). On the basis of these potent antioxidant ...
Disclosed are nonstinging, sustained release ophthalmic formulations. The formulations comprise a cationic drug, an acidic mucomimetic polymer and a polystyrene sulfonic acid polymer. In particular, formulations for the control of intraocular pressure and glaucoma are disclosed. Methods for use of the formulations are also disclosed.
China Water Treatment /Acrylic Acid-2-Acrylamido-2-Methylpropane Sulfonic Acid Copolymer (AA/AMPS) 40.0% Min, 90.0%, Find details about China AA-AMPS, 40623-75-4 from Water Treatment /Acrylic Acid-2-Acrylamido-2-Methylpropane Sulfonic Acid Copolymer (AA/AMPS) 40.0% Min, 90.0% - Shanghai Smart Chemicals Co.,Ltd.
Herbal medicine is an important part of health care system in most of the countries. Rubus fairholmianus is an unexplored berry in folkloric medicine. In this study, we aimed to understand the importance of R. fairholmianus in pharmaceutical industry for the development of cost-effective cancer therapeutic drugs using in vivo and in vitro analysis. Chemical characterization, antioxidant, antiproliferative and apoptosis inducing properties of R. fairholmianus root methanolic column subfraction (RFM) were investigated. The RFM displayed the presence of alpha-tocopherol, flavonol glycoside and apigenin in the chemical characterization. DPPH (2, 2-diphenyl-1-picrylhydrazyl) and ABTS (2, 2-azinobis-(3-ethylbenzothiazoline-6-sulfonic acid)) radical scavenging assays exhibited an activity of 7.56 g/mL (IC ) and 20514.7 M trolox equivalents/g respectively. The solid and ascites tumors in mice were reduced significantly upon 100 mg/kg RFM treatment by reducing the tumor volume (1.86 cm ), tumor weight ...
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice ...
In the food industry, in the process of creating new agricultural plant products, and in the testing of anti-cancer drugs there is often a need to assay multiple samples of low molecular weight antioxidants, plant samples and foods rich in antioxidants, with minimal additional costs and low degrees of uncertainty. With these demands in mind, we decided to study the fully automated assay of antioxidants using not only automated sample measurements but also automated processing of samples and application of reagents. The automated pipetting system epMotion 5075 and the automated spectrophotometer BS 400 were chosen for the assay purposes. Five methods were introduced for the automation: 2-diphenyl-1-picrylhydrazyl (DPPH) test, ferric reducing antioxidant power (FRAP) method, 2,2-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) based test, N,N-dimethyl-1,4-diaminobenzene (DMPD) based test and the Free Radicals method. Samples containing one of the four antioxidants (standard rutin, ...
Hydrolysis o f the original sample to the corresponding carbamate, G T X 3 (5), w o u l d increase the toxicity o f the sample 6-fold, to 1400 mouse units. Subsequent epimerization o f the hydrolysate, 5, to a 4:1 mixture o f the carbamates GTX2 (3) and 5 (or hydrolysis o f the epimeric sulfamates 4 and 6 to the same mixture o f carbamates) w o u l d then change the toxicity to 1,120 mouse units. T h e observed toxicity and composition o f the hypothetical sample w h i c h started as pure 6 may l i e anywhere w i t h i n the indicated bounds as these interconversions occur. It can be increased at any point by hydrolysis, toward the toxicity shown o n the upper line. T h e highest toxicity w i l l be attained i f the hydrolysis is performed o n 6 prior to epimerization, resulting i n 5. Hydrolysis o f the epimeric 4 and 6, o r epimerization o f the hydrolysate, will ultimately result i n a stable, equilibrated mixture o f the epimers 3 and 5, with a slightly lower toxicity. T h e hypothetical ...
Recent advances possess identified metabolic reprogramming as an fundamental mechanism for cancer drug resistance. The email address details are proven as means SD, n = 6. After that we used an inhibitor of ACAT-1, avasimibe, and examined its efficiency in Mia PaCa-2 and G3K cells. The outcomes present that avasimibe successfully suppresses cell viability of both Mia PaCa-2 and G3K cells with IC50s of 7.0 and 8.85 M, respectively (Fig 1E). On the other hand, the IC50s of gemcitabine in Mia PaCa-2 and G3K cells are 1.23 and 36.34 M, respectively (Fig 1F), indicating G3K cells are highly resistant to gemcitabine. These outcomes show a higher antitumor efficiency of avasimibe also in gemcitabine resistant tumor cells. Mix of avasimibe and gemcitabine displays synergistic impact 0.05, ** 0.01, *** 0.001. Avasimibe overcomes gemcitabine-resistance by downregulating Akt pathway To research the potential systems where avasimibe overcomes gemcitabine level of resistance, weve performed immunoblotting ...
7-Amino-4-hydroxy-3-[(4-methoxy-2-sulfophenyl)azo]naphthalene-2-sulfonic acid/ACM16452065 can be provided in Alfa Chemistry. We are dedicated to provide our customers the best products and services.
Boron sulfonic acid (BSA) plays an important role in the improvement of many organic reaction conditions as a solid acid catalyst, which dramatically has attracted the attention of many chemists. This review covers all highlight research of literatures in the last decade from 2008 to 2018.
4-(N-Ethylbenzamido)benzene-1-sulfonic acid | C15H15NO4S | CID 138366079 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.
1,4-dihydroquinazoline-4-sulfonic acid | C8H8N2O3S | CID 582558 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards/toxicity information, supplier lists, and more.
Looking for SPECTRUM P Anisidine Sulfonic Acid,25g (26WZ13)? Graingers got your back. Price:$80.75. Easy ordering & convenient delivery. Log-in or register for your pricing.
102415-55-4 - KRFAVSHDVRABPO-CIVUBGFFSA-N - Adenosine-5-triphosphoro-gamma-1-(5-sulfonic acid)naphthyl ethylamidate - Similar structures search, synonyms, formulas, resource links, and other chemical information.
terephthalylidene dicamphor sulfonic acid: structure given in first source; abreviated as TDSA; FDA approved 2006 as component of Anthelios SX along with avobenzone and octocrylene
시중 유통 혼합잡곡 첨가 취반 밥 에탄올 추출물에 대한 radical 소거활성은 항산화물질에 의해 환원되어 짙은 자색 이 탈색됨으로써 항산화 물질의 전자공여능을 측정할 때 사용되고 있는 DPPH radical 소거활성(Nieva et al., 2000) 과 혈장에서 ABTS radical의 흡광도가 항산화제에 의해 억 제되는 것에 기초하여 개발된 ABTS radical 소거활성(Kim et al., 2009)을 측정한 결과 Fig. 4 및 Table 4와 같이 나타 났다. 전자공여능은 지질과산화의 연쇄반응에 관여하는 free radical에 전자를 공여하여 산화를 억제시키는 척도가 되며, free radical은 인체 내에서 각종질병과 세포의 노화를 일으 키므로 식물 추출물 등에서 항산화제로 작용할 수 있는 물질 을 확인할 필요성이 있다(Kim et al., 2009). 일반밥솥과 압 력밥솥으로 취반한 백미 추출물의 DPPH radical 소거활성은 각각 3.15±0.04 및 3.71±0.07 mg ...
Three esterase-labile, but chemically-stable sulfonate protecting groups have been designed and synthesized. One of these sulfonate esters allowed the cytoplasmic delivery and unmasking of a sulfonated dye in live cells.
BACKGROUND: To elucidate whether and how alkali treatment, which is a common process for rice protein (RP) extraction, affects antioxidant activity of RP, the different degree of alkali (from 0.1% to 0.4% of NaOH) was used to extract RP (RP‐1, RP‐2, RP‐3, RP‐4). RESULTS: The antioxidant capacities of scavenging free radicals [2,2′‐azinobis(3‐ethylbenzothiazoline‐6‐sulfonic acid] diammonium salt, A ...
Ahmed, Sabbir, Shahid, Imran, Dhanani, Sachin and Owen, Caroline P. (2009) Synthesis and biochemical evaluation of a range of sulfonated derivatives of 4-hydroxybenzyl imidazole as highly potent inhibitors of rat testicular 17 alpha-hydroxylase/17,20-lyase (P-450(17 alpha)). Bioorganic & Medicinal Chemistry Letters, 19(16), pp. 4698-4701. ISSN (print) 0960-894X ...
Compositions for preventing the attachment of dental plaque to the surfaces of the teeth comprise certain sulfonated poly(arylene ether sulfone) polymers and the pharmaceutically acceptable salts thereof in a pharmaceutically acceptable nonabrasive gel vehicle comprising a selected polyoxypropylene/polyoxyethylene block copolymer as the principal gelling agent.
Looking for sodium dodecylbenzenesulphonate powder? Details about Sodium Dodecylbenzenesulphonate & sodium dodecyl benzene sulfonate uses.Get.
The crystal structure of 8-hydroxy-7-iodoquinoline-5-sulfonic acid-urea-water, C9H6INO4S烈4N2O爲O, shows the zwitterionic (quinoline-sulfonate group) ferron molecule lying in a crystallographic mirror plane which related two of the sulfonate O atoms. Both the urea and the water molecule lie across the same plane and are inter-associated with the ferron molecules both within and between the planes by extensive hydrogen bonding, involving most available donor and acceptor sites on all three molecules. This includes a cyclic R22(8) sulfonate-urea association. The result is a three-dimensional layered structure ...
Fatty Methyl Ester Sulfonates Market (FMES Market) was valued at USD 0.57 billion in 2014 and is anticipated to reach USD 1.58 billion by 2020, expanding at a CAGR of 18.6% between 2015 and 2020
Spillane, W.J.,Birch, G.G.,Drew, M.G.B.,Bartolo, I. (1992) Correlation of computed van der Waals and molecular volumes with Apparent Molar Volumes (AMV) for amino acid, carbohydrate and sulfamate tastant molecules. Relationship between Corey-Pauling-Koltun volumes (VCPK) and computed volumes. Journal of the Chemical Society, Perkin Transactions 2, (4) [Details] ...
No guideline study and non-GLP but performed according to scientific standards at time of performance. Acceptable based on nowadays existing guidlines and standards. Well performed and documented. Reliability declaration regarding procedures and performance available ...
Molecular Weight : 188 grams/mole. Empirical Formula : C6 H8 O3 N2 S. Purity : Min. 98.00%. Insoluble Content : Max. 0.20%. Moisture : Max. 0.30%. Other impurities : Max. 0.10%. Solubility : Soluble In Alkaline Water. Physical appearance : Light gray White powder. Basis of Sale : On As Is basis. Packing : 25/50kgs HDPE bags with double liners inside. ...
| Temelleri 1940l y llara dayanan Acar Kimya, kimyevi hammadde ithalat , ihracat ve pazarlamas yapmaktad r. Firmam z, m teri talepleri do rultusunda fason retim, dan manl k hizmeti ve teknik destek hizmeti de vermektedir.
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A green approach to the biosynthesis of amino acid functionalized silver nanoparticles (AgNPs) using Neem gum is reported herein. To the best of our knowledge, this is the first attempt at biosynthesizing AgNPs. The AgNPs show good colloidal stability with surfactants and dyes. The reduction of Methylene blue (MB)
Effect of Biological Slime on the Retention of Alkyl Benzene Sulfonate on Granular Media B. B. EWING, Professor of Sanitary Engineering S. K. BANERJI, Research Assistant Department of Civil Engineering University of Illinois Urbana, Illinois The use of synthetic detergents has greatly increased since their advent about 15 years ago. These detergents have, of necessity, been discarded with waste waters to the environment. Because the surface active agents in the packaged product, unlike soaps, are not readily degraded by bacteria in soil, streams, and sewage treatment plants, the pollution of the aqueous environment has been recognized as a serious problem almost since the first inception of their use. The complaints have included frothing in waste treatment plants and streams as well as taste and odor problems and foaming of drinking water taken from grossly polluted streams. Not until 1958 were there instances of contamination of ground water reported (1). Since this time there have been ...
Gemcitabine、Irinotecan、Trifluridine、Trifluorothymine、Atracurium besylate、Calcium folinatc、Folinic acid、Mesna、Imatinib mesylate
In this study, leaves of three indigenous varieties of Mulberry namely, Morus alba L., Morus nigra L. and Morus rubra L. were investigated for their antioxidant potential and their proximate composition was determined. The yields of 80% methanolic extracts ranged between 8.28-13.89%. The contents of total phenolics (TPC), total flavonoids (TFC) and ascorbic acid (AA) ranged between 16.21-24.37 mg gallic acid equivalent (GAE)/g, 26.41-31.28 mg rutin equivalent (RE)/g and 0.97-1.49 mg/g, respectively. The antioxidant activity of leaf extracts was evaluated by measuring 1,1-diphenyl-2-picrylhydrazyl (DPPH•) radical scavenging actity, 2,2-azino-bis-(3-ethylbenzthiazoline-6-sulphonic acid (ABTS•+) radical cation scavenging capacity and ferric ion reducing power and values ranged between 1.89-2.12, 6.12-9.89 and 0.56-0.97 mM Trolox equivalent/g of dried leaves, respectively. The investigated features reveal good nutritive and antioxidant attributes of all the varieties with mutually significant
J and Sharp Holdings Pty Ltd is a leading Manufacturer Exporter & Supplier of Linear Alkyl Benzene Sulfonic Acid in South Africa, Exporter & Supplier of Linear Alkyl Benzene Sulfonic Acid in South Africa, Wholesale Linear Alkyl Benzene Sulfonic Acid in Johannesburg, Linear Alkyl Benzene Sulfonic Acid Manufacturing Company in South Africa.
Development policies and plans are also discussed as well as manufacturing processes and cost structures. Benzene Sulfonic Acid market report also states import/export, supply and figures as well as cost, price, revenue and gross margin by regions (United States, EU, China and Japan), and other regions can be added.. Ask for Discount @ Then, Benzene Sulfonic Acid market report focuses on major leading industry players with information such as company profiles, product picture and specification, capacity, production, price, cost, revenue and contact information. Upstream raw materials, and downstream consumers analysis is also carried out. Whats more, the Benzene Sulfonic Acid industry development trends and marketing channels are analysed.. For each player, product details, capacity, price, cost, gross and revenue numbers are given. Their contact information is provided for better understanding.. Purchase Benzene Sulfonic Acid ...
Two types of composite imprinted membranes, i.e., composite membrane comprised of D-Phe imprinted beads and D-Phe imprinted membrane or DCM and composite membrane comprised of L-Phe imprinted beads and L-Phe imprinted membranes or LCM, were synthesized by phase inversion technique after a uniform dispersion of beads within the polymeric solutions using simple physico-mechanical process. The assemblies of the prepared DCM, LCM and control membranes were employed in ultrafiltration for chiral separation of D, L-Phenylalanine racemate solution. DCM and LCM showed an improved adsorption capacity (0.334 mg g-1 and 0.365 mg g-1 respectively), and adsorption selectivity (2.72 and 2.98 respectively). However, the percent rejection of the template and counter enantiomer were lower than that of control membranes. Compared to control membrane, the DCM and LCM showed inverse permselectivity. These composite membranes having better adsorption and separation ability for Phenylalanine racemate solution will be ...
The primary objective of this project was to prepare and characterize a hydrogen permselective palladium-ceramic composite membrane for high temperature gas separations and catalytic membrane reactors. Electroless plating method was used to deposit a thin palladium film on microporous ceramic substrate. The objective of this paper is to discuss the preparation and characterization of a thin-film palladium-ceramic composite membrane for selective separation of hydrogen at elevated temperatures and pressures. In this paper, we also present a model to describe the hydrogen transport through the palladium-ceramic composite membrane in a cocurrent flow configuration.
Attention for Chapter 12: Sulphonation Technology as a Tool for the Educator in Preparing Case Studies and Final-Year Design Projects in a Chemical Engineering Curriculum ...
Name: 5-Hydroxynaphthalene-1-sulfonic acid CA Name: 1-Naphthalenesulfonic,5-hydroxy- Molecular Structure: 5-Hydroxynaphthalene-1-sulfonic acid,1-Naphthalenesulfonic,5-hydroxy-,CAS 117-59-9,224.23,C10H8O4S 5-Hydroxynaphthalene-1-sulfonic acid,1-Naphthalenesulfonic,5-hydroxy-,CAS 117-59-9,224.23,C10H8O4S Molecular Formula:C10H8O4S Molecular Weight: 224.23 CAS Registry Number: 117-59-9
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Methods Experimental animals were divided into four groups: normal group without any treatment (Normal), contral group were treated orally with distilled water (Control), Experimental group were treated orally with JGS at a concentration of 200 mg/kg/day (JGS 200) and Experimental group were treated orally with JGS at a concentration of 200 mg/kg/day (JGS 400). Rats in each group except the normal group were induced fractures in the skull. <In vitro> The 1,1-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity and 2,2-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid (ABTS) radical scavenging activity were measured to evaluate antioxidant activity. The production of nitric oxide (NO), interleukin- 1β (IL-1β), interleukin-6 (IL-6) and tumor necrosis factor-α (TNF-α) in the RAW 264.7 cells were measured to evaluate anti-inflammatory activity. <In vivo> The production of osteocalcin calcitonin, carboxy-terminal telepeptides of type II collagen (CTX II), transforming growth ...
This compound is chosen because the enzyme facilitates the reaction with hydrogen peroxide, turning it into a green and soluble end-product. Its new absorbance maximum of 420 nm light (ε = 3.6 × 104 M-1 cm-1)[2] can easily be followed with a spectrophotometer, a common laboratory instrument. It is sometimes used as part of a glucose estimating reagent when finding glucose concentrations of solutions such as blood serum. ABTS is also frequently used by the food industry and agricultural researchers to measure the antioxidant capacities of foods.[3] In this assay, ABTS is converted to its radical cation by addition of sodium persulfate. This radical cation is blue in color and absorbs light at 734 nm.[4] The ABTS radical cation is reactive towards most antioxidants including phenolics, thiols and Vitamin C.[5] During this reaction, the blue ABTS radical cation is converted back to its colorless neutral form. The reaction may be monitored spectrophotometrically. This assay is often referred to as ...
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The report generally describes morpholinopropane sulfonic acid, examines its uses, production methods, patents. Morpholinopropane sulfonic acid market
Highly conductive and low vanadium permeable crosslinked sulfonated poly(ether ether ketone) (cSPEEK) membranes were prepared by electrophilic aromatic substitution for a Vanadium/Air Redox Flow Battery (Vanadium/Air-RFB) application. Membranes were synthesized from ethanol solution and crosslinked under different temperatures with 1,4-benzenedimethanol and ZnCl2 via the Friedel-Crafts crosslinking route. The crosslinking mechanism under different temperatures indicated two crosslinking pathways: (a) crosslinking on the sulfonic acid groups; and (b) crosslinking on the backbone. It was observed that membranes crosslinked at a temperature of 150 °C lead to low proton conductive membranes, whereas an increase in crosslinking temperature and time would lead to high proton conductive membranes. High temperature crosslinking also resulted in an increase in anisotropy and water diffusion. Furthermore, the membranes were investigated for a Vanadium/Air Redox Flow Battery application. Membranes crosslinked at
0074] A sulphonate detergent with 500 TBN and its preparation are disclosed in U.S. Pat. No. 5,792,732. In Example 2 thereof, a 500 TBN all-linear alkylbenzene sulphonate is prepared by reacting an alkyl benzene sulphonate from Witco Corp. (now known as Crompton) with Ca(OH)2 and CaO in n-heptane and methanol and bubbling with CO2. It is also reported in the aforementioned patent (col. 5) that a 500 TBN overbased sulphonate containing highly branched alkylbenzene sulphonate is available from Witco Corp. (now known as Crompton) as Petronate® C-500. Another method for preparing an overbased sulphonate detergent of high metal ratio is disclosed in U.S. Pat. No. 6,444,625 (see, for instance, column 3, bottom). The latter process includes providing a sulphonic acid to a reactor, adding a lime reactant for neutralization and overbasing, adding a lower aliphatic C1 to C4 alcohol and a hydrocarbon solvent, and carbonating the process mixture with carbon dioxide during which process the exotherm of the ...
Peroxidases catalyse reactions in which hydrogen peroxide is reduced and a suitable electron donor is subsequently oxidised. Most assays are based on the principle that the electron donor in oxidised form absorbs light and can be determined by a spectrophotometric assay. Currently 2, 2-azino-di-3-ethylbenzthiazoline-6-sulphonic acid (ABTS) is accepted as the electron donor of choice for peroxidase assay.
A single, non-guideline study published in 1966. A soil microorganism inoculum was used in an aerobic water-based medium at 25C. Duplicate flasks of a single test substance concentration, 75 mg/L hydroxybenzene sulfonic acid, were sampled and analyzed over 64 days for change in spectral absorbance as the measure of test substance presence. An abiotic control using HgCl2 was run in parallel. The time necessary for complete degradation was 32 days. The degradation was due to biological activity because no decreased absorbance was seen in the abiotic control. The half-life of the test substance under the conditions of this study would be less than 32 days. This is a non-guideline study, however, the study design is sufficiently representative and there are sufficient details to support a conclusion that the test substance, hydroxybenzene sulfonic acid is biodegradable under aerobic soil conditions. The study is considered to be of value in providing weight of evidence to support this conclusion. ...
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Isolated Enterococcus faecalis YZ 66 strain shows ability to decolorize various industrial dyes among which, it showed complete decolorization and degradation of toxic, sulfonated recalcitrant diazo dye Direct Red 81 (50 mg/L) within 1.5 h of incubation under static anoxic condition. The optimum pH …
This page contains information on the chemical Alkenes, C14-16 Alpha-, Sulfonated, Sodium Salts including: 2 synonyms/identifiers.
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A novel ionic liquid entitled 3-methyl-1-sulfonic acid imidazolium mesylate ([Msim][OMs]) was synthesized, and characterized by studying its FT-IR, 1H NMR, 13C NMR and mass spectra. This ionic liquid was employed as a dual-functional catalyst for the preparation of bis-coumarins via the one-pot pseudo three-component reaction of 4-hydroxycoumarin (2 eq.) and arylaldehydes (1 eq.) under solvent-free and relatively mild conditions. Owing to dual-functionality of [Msim][OMs] (having acidic and basic sites), it could act as a highly effective catalyst for the reaction. Additionally, an attractive mechanism based on dual-functionality of the catalyst was proposed.
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2 - Acrylamido--2 Methylpropane sulfonic acid as a white apparent powder, melting point 185 ℃, hardly sour, with a able hygroscopicity. Such as damp, AMPS monomer cocky polymerization can occur. Its baptize band-aid is acidity, acrid in two methyl amide, partially acrid in methanol, ethanol, baffling in acetone. Stable at allowance temperature. In aqueous solution, monomer…
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The present study evaluated the potential biological activities of rhizospheric fungi isolated from the Achanakmar Biosphere Reserve, India. Fungus, Talaromyces purpureogenus isolate-ABRF2 from the soil of the Achanakmar biosphere was characterized by using morphological, biochemical and molecular techniques. Fungus was screened for the production of secondary metabolites using a specific medium. The metabolites were extracted using a suitable solvent and each fraction was subsequently evaluated for their antioxidant, antimicrobial, antiproliferative and anti-aging properties. The ethanolic extract depicted the highest antioxidant activity with 83%, 79%, 80% and 74% as assessed by ferric reducing power, 2,2-diphenyl 1-picrylhydrazyl, 2,2′-azino-bis3-ethylbenzthiazoline-6-sulfonic and phosphomolybdenum assays, respectively. Similarly, ethanolic extracts depicted marked antimicrobial activity as compared with standard antibiotics and antifungal agents as well as demonstrated significant
The sulfonic acid has a low pKa ensuring that it is fully ionized to the sulfonate at the pH's found in the intestinal tract. ... Kosswig K (2000). "Sulfonic Acids, Aliphatic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002 ... 2000). "Sulfonic Acids". Kirk-Othmer Encyclopedia of Chemical Technology. John Wiley & Sons, Inc. doi:10.1002/ ... Taurine is an unusual example of a naturally occurring sulfonic acid. Taurine exists as a zwitterion H3N+CH2CH2SO3−, as ...
It can decompose explosively when heated above 170 °C.[citation needed] Kosswig, Kurt (2000). Sulfonic Acids, Aliphatic. ... Ethionic acid undergoes further hydrolysis to isethionic acid: Carbyl sulfate is used as precursor for vinylsulfonic acid and ... Disulfuric acid and chlorosulfuric acid can also be used as a sulfonating agent, replacing sulfur trioxide. Instead of ethylene ... with a variety of applications are available by nucleophilic addition at the activated double bond of the vinyl sulfonic acid ...
Sulfonic acid chlorides, or sulfonyl chlorides, are a sulfonyl halide with the general formula RSO2Cl. They are generally ... Kosswig, Kurt (2000). "Sulfonic Acids, Aliphatic". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi: ... HCl Or by treating with SOCl2 An obvious reaction is their tendency to hydrolyse to the corresponding sulfonic acid: C6H5SO2Cl ... "Benzenesulfonic Acids and Their Derivatives". Ullmann's Encyclopedia of Industrial Chemistry. Weinheim: Wiley-VCH. doi:10.1002/ ...
... sulfonic and phosphonic acids; amino, hydroxycarboxylic, and carboxylic acids; purines and pyrimidines; and kerogen-type ... as well as the amino acids, nucleobases, and many other compounds in meteorites, carry deuterium (2H) and isotopes of carbon, ...
Reactions of aryl sulfonic acidsEdit. As a functional group, aryl sulfonic acids undergo desulfonation when heated in water: RC ... Aromatic sulfonation is an organic reaction in which a hydrogen atom on an arene is replaced by a sulfonic acid functional ... Aromatic sulfonic acids are intermediates in the preparation of dyes and many pharmaceuticals. Sulfonation of anilines lead to ... Aryl sulfonic acids are used as detergents, dye, and drugs. ... Synthesis of sulfanilic acid from aniline and sulfuric acid.[7] ...
2-Hydroxy-4-Methoxybenzophenone-5-sulfonic acid, 3-Benzoyl-4-hydroxy-6-methoxybenzenesulfonic acid, Benzophenone-4, Escalol 577 ... Phenylbenzimidazole sulfonic acid Ensulizole, Eusolex 232, PBSA, Parsol HS 4% (US, AUS) 8% (EU) 3% (JP) EU, USA, AUS, JP ... Mexoryl SX, Terephthalylidene Dicamphor Sulfonic Acid 10% EU, AUS (US: approved in certain formulations up to 3% via New Drug ... p-Aminobenzoic acid PABA 15% (EU: banned from sale to consumers from 8 October 2009) USA, AUS Protects against skin tumors in ...
Sulfonic, sulfinic and sulfenic acids, esters, amides, and related compounds[edit]. Sulfonic acids have functionality R−S(=O)2− ... Sulfonic acids like trifluoromethanesulfonic acid is a frequently used reagent in organic chemistry. Sulfinic acids have ... In the series sulfonic-sulfinic-sulfenic acids, both the acid strength and stability diminish in that order.[21][22] ... Thiocarboxylic acids and thioamides[edit]. Thiocarboxylic acids (RC(O)SH) and dithiocarboxylic acids (RC(S)SH) are well known. ...
Sarver, L. A; Kolthoff, I. M (1931). "Diphenylamine Sulfonic Acid as a New Oxidation-Reduction Indicator". Journal of the ... With strong acids, it forms salts. For example, treatment with sulfuric acid gives the bisulfate [(C6H5)2NH2]+[HSO4]− as a ... Sarver, L. A; Kolthoff, I. M (1937). "Electrochemical Properties of Diphenylbenzidine Sulfonic Acid". Journal of the American ... The diphenylaminesulfonic acid is a simple prototype redox indicator, owing to its improved aqueous solubility compared with ...
NH2OH reacts with chlorosulfonic acid to give hydroxylamine-O-sulfonic acid, a useful reagent for the synthesis of caprolactam ... HOSO2Cl + NH2OH → NH2OSO2OH + HCl The hydroxylamine-O-sulfonic acid, which should be stored at 0 °C to prevent decomposition, ... preparation of hydroxylamine-O-sulfonic acid). Calorimetric studies of hydroxylamine decomposition Chemical company BASF info ... They can also act as antioxidants for fatty acids. In the synthesis of Nylon 6, cyclohexanone (1) is first converted to its ...
The resulting phenol sulfonic acid chlorinates at the positions flanking the phenol. Hydrolysis releases the sulfonic acid ... which is converted to its 4-sulfonic acid derivative. ... synthesis starts with the ethyl ester of 4-hydroxybenzoic acid ... Otto Lindner; Lars Rodefeld (2005). "Benzenesulfonic Acids and Their Derivatives". Ullmann's Encyclopedia of Industrial ...
Hydroxylamine-O-sulfonic acid provides 3-pinanamine. Also useful is the reaction of diisopinocampheylborane with an aldehyde ( ... Effective Intramolecular Asymmetric Reductions of α-,β and γ-Keto Acids with Diisopinocampheylborane and Intermolecular ...
Sulfonic acids are used in many detergents. Compounds with carbon-sulfur multiple bonds are uncommon, an exception being carbon ... Sulfuric acid and SO3 combine to give oleum, a solution of pyrosulfuric acid (H2S2O7) in sulfuric acid. Thiosulfate salts (S ... and sulfurous acid (H2SO3). These acids are components of acid rain, lowering the pH of soil and freshwater bodies, sometimes ... Sulfuryl chloride and chlorosulfuric acid are derivatives of sulfuric acid; thionyl chloride (SOCl2) is a common reagent in ...
By reacting toluene sulfonic acids with the base, Volkova obtained the corresponding cresols, thereby facilitating the sulfonic ... Obtained in pure form ortho-toluene sulfonic acid, its acid chloride, and its amide (1870); Synthesized para-tricresol ... Discovered that substitution of the hydrogen atom of the ammonia residue in the amides of sulfonic acids with an acid residue ( ... Volkova was the first chemist to prepare pure ortho-toluene sulfonic acid, its acyl chloride, and its amide (1870). She was the ...
This reaction affords 4-nitrotoluene-2-sulfonic acid. Oxidation of this species with sodium hypochlorite yields the disodium ... Reduction gives 4,4′-diamino-2,2′-stilbenedisulfonic acid, which is a common optical brightener. Arthur Green and André Wahl ... Cumming, William M.; Hopper, I. Vance; Wheeler, T. Sherlock (1926). "Preparation 294.-Dinitro-Stilbene-Disulphonic Acid (Na ... On the oxidation of para-nitrotoluenesulfonic acid]. Ber. Dtsch. Chem. Ges. (in German). 30 (3): 3097-3101. doi:10.1002/cber. ...
They are the conjugate bases of sulfonic acids with formula RSO2OH. As sulfonic acids tend to be strong acids, the ... A sulfonate is a salt or ester of a sulfonic acid. It contains the functional group R-SO− 3, where R is an organic group. ... In the presence of water, they slowly hydrolyze to the hydroxy sulfonic acids. Sultone oximes are key intermediates in the ... Sulfonates are the conjugate base of sulfonic acids. Sulfonates are generally stable in water, non-oxidizing, and colorless. ...
... are then sulfonated with sulfur trioxide to give the sulfonic acid. The sulfonic acid is subsequently neutralized with sodium ...
From sulfonic acids, the corresponding sulfochlorides are formed analogously. In an analogous manner, the activation of ... Thioacetic acid reacts with acetyl-protected α-galactosyl trichloroacetimidate even without additional acid catalysis to ... 1999). "A mild and efficient procedure for the preparation of acid chlorides from carboxylic acids". Tetrahedron Letters. 40 ( ... It is sensitive towards water, acids and bases. The bond lengths are 146.0 pm (C-C), 116.5 pm (C-N) and 176.3 pm (C-Cl). The ...
Meteoritic material studies of Thiemens in sulfur isotopes have shown that sulfonic acids from chondritic meteorites have shown ... "Sulfur and Hydrogen Isotope Anomalies in Meteorite Sulfonic Acids". Science. 277 (5329): 1072-1074. doi:10.1126/science. ... It was shown that the manufacture of adipic acid, used in nylon production is a globally important source. In the year post ...
... sulfonic acid esters are components of common photoresist materials. Such photoresists are used in the ... The ketene adds water to form indane-carboxylic acid. Dammel, Ralph (1993). Diazonaphthoquinone-based Resists. Int. Soc. ... reacts with ambient water to form a base soluble indene carboxylic acid. The exposed regions of the photoresist film become ...
Aryl sulfonic acids are used as detergents, dye, and drugs. Typical conditions involve heating the aromatic compound with ... Aromatic sulfonic acids are intermediates in the preparation of dyes and many pharmaceuticals. Sulfonation of anilines lead to ... Aromatic sulfonation is an organic reaction in which a hydrogen atom on an arene is replaced by a sulfonic acid functional ... As a functional group, aryl sulfonic acids undergo desulfonation when heated in water: RC6H4SO3H + H2O → RC6H5 + H2SO4 When ...
... and Mixed Phosphonic/Sulfonic Acids". Canadian Journal of Chemistry. 67: 1795. doi:10.1139/v89-278. "Jean'ne M. Shreeve - Dept ... Su, Debao; Cen, Wenbiao; Kirchmeier, Robert L.; Shreeve, Jean'ne M. (1989). "Synthesis of Fluorinated Phosphonic, Sulfonic, ... Phosphonic Acid". Journal of the American Chemical Society. 111: 1773. doi:10.1021/ja00187a033. Guo, Cai-Yun; Kirchmeier, ...
2-Acrylamido-2-methylpropane sulfonic acid (AMPS) v t e. ... PolyAMPS, or poly(2-acrylamido-2-methyl-1-propanesulfonic acid ...
A Lewis acid, such as TiCl4, must be used in order to promote condensation. Ketone Condensations Using Sulfonic Acid Ion ...
3-Amino-2-(4-chlorophenyl)propane-1-sulfonic acid. Identifiers CAS Number ... Valerian constituents (e.g., valerenic acid). *Volatiles/gases (e.g., chloral hydrate, chloroform, diethyl ether, paraldehyde, ...
Synthesis of aromatic carboxylic acids from sulfonic acid and formates (1869). Nitroalkanes from alkyl iodides and silver ... Discovery of iodoso compounds in 1892 by reacting o-iodobenzoic acid with nitric acid. Observation (1892) that ortho- ... Discovery of nitrolic acids (with Locher in 1874). Development of a method to distinguish primary, secondary, and tertiary ... substituted benzoic acid derivatives are esterified with difficulty. This principle is now known as the Victor Meyer ...
... is the polycondensation product of metacresol sulfonic acid and formaldehyde. It is used as a topical hemostatic ...
In this form, it is the salt of a sulfonic acid. This compound is an extension of the phenanthroline series of coordination ... labels containing chromophores which have longer excitation wavelength and emission wavelength than the aromatic amino acids. ...
Thioflavin S results from the methylation of dehydrothiotoluidine with sulfonic acid. This sulfonic acid on oxidation with ... Thioflavin T is obtained by the methylation of dehydrothiotoluidine with methanol in the presence of hydrochloric acid. ...
Perfluorinated carboxylic acids and sulfonic acids are produced in this way. 1,1-Difluoroethane is produced by adding HF to ... When dilute, hydrofluoric acid behaves like a weak acid, unlike the other hydrohalic acids, due to the formation of hydrogen- ... In 1771 Carl Wilhelm Scheele prepared the aqueous solution, hydrofluoric acid in large quantities, although hydrofluoric acid ... Hydrogen fluoride is produced by the action of sulfuric acid on pure grades of the mineral fluorite: CaF2 + H2SO4 → 2 HF + ...
Sulfonic acid functional groups can be attached to activated carbon to give "starbons" which can be used to selectively ... The chemical is typically an acid, strong base,[1][2] or a salt[20] (phosphoric acid 25%, potassium hydroxide 5%, sodium ... "Sulfonic groups anchored on mesoporous carbon Starbons-300 and its use for the esterification of oleic acid". Fuel. 100: 128- ... boric acid, petroleum products, and is particularly ineffective against poisonings of strong acids or alkali, cyanide, iron, ...
The two sulfonic acid groups have extremely low pKa and will normally be negatively charged, thus at a pH of around zero the ... A protein sample is added to a solution of the dye in phosphoric acid and ethanol. Under the acid conditions the dye is ... The sheet was then soaked in sulfosalicylic acid to fix the protein bands and then transferred to a solution of the dye.[10] ... Through a study done at the University of Albany, it was shown that the ability of the Coomassie dye to target amino acids with ...
They are made by reacting carboxylic acids like acetic acid with amines. There are many ways to make them. They are also used ... This is ammonia acting as an acid, although a very weak one. Amides made by deprotonating ammonia are very strong bases. Sodium ... Phosphonous and Phosphonic acid. *Pyridine derivative. *Selenol. *Selenonic acid. *Sulfone. *Sulfonic acid ...
சல்போனிக் அமிலம் (Sulfonic acid) என்பது R−S(=O)2−OH, என்ற பொது வாய்ப்பாட்டைக் கொண்ட கரிம கந்தகச் சேர்மங்களில் ஓர் ... Guido Busca "Acid Catalysts in Industrial Hydrocarbon Chemistry" Chem. Rev. 2007, 107, 5366-5410. எஆசு:10.1021/cr068042e ...
Sulfonic acids: Acamprosate. Religion and alcohol. *Christian views on alcohol *alcohol in the Bible ...
... after Air Force tests showed perfluorooctane sulfonic acid (PFOS) 12.5 times higher than the EPA's Provisional Health Advisory ... Perfluorooctanoic acid (PFOA) was also found, but below the health advisory level.[56] The Air Force had tested the well in ...
Sulfonic acids: Acamprosate. Religion and alcohol. *Christian views on alcohol *alcohol in the Bible ... The enzyme acetaldehyde dehydrogenase then converts the acetaldehyde into non-toxic acetic acid. ...
It can take protons away from some acids. It can also be a nucleophile. It can be changed into imines and other functional ... Phosphonous and Phosphonic acid. *Pyridine derivative. *Selenol. *Selenonic acid. *Sulfone. *Sulfonic acid ...
Sulfonic acids: Acamprosate. Religion and alcohol. *Christian views on alcohol *alcohol in the Bible ...
During this reaction, nitro groups are introduced, and the sulfonic acid group is displaced. The reaction is highly exothermic ... Picric acid[1]. Carbazotic acid. Phenol trinitrate. Picronitric acid. Trinitrophenol. 2,4,6-Trinitro-1-phenol. 2-Hydroxy-1,3,5- ... Redirected from Picric Acid). Picric acid is an organic compound with the formula (O2N)3C6H2OH. Its IUPAC name is 2,4,6- ... The sensitivity of picric acid was demonstrated in the Halifax Explosion. Picric acid was used in the Battle of Omdurman,[7] ...
3-ethylbenzthiazoline-6-sulphonic acid) (ABTS), 2-keto-4-thiomethyl butyric acid and 4-aminoantipyrine. ... Its amino acid sequence is highly conserved in eukaryotes, differing by only a few residues. In more than thirty species, 34 of ... Many higher-order organisms possess a chain of 104 amino acids.[9] The sequences of cytochrome c in humans is identical to that ... Amino acid sequences in cytochrome c proteins from different species, adapted from Strahler, Arthur; Science and Earth History ...
Sulfonic acids: Acamprosate. Religion and alcohol. *Christian views on alcohol *alcohol in the Bible ... Antibodies against the enzyme glutamic acid decarboxylase (GAD: enzyme changing glutamate into GABA) cause cerebellar deficits. ... glutamic acid decarboxylase ataxia.[43] Novel therapies target the RNA defects associated with cerebellar disorders, using in ... recessive gene disorder where mutations in the ALDH5A1 gene results in the accumulation of gamma-Hydroxybutyric acid (GHB) in ...
... can be oxidized to ethyl sulfonic acid, using strong oxidizing agents. Weaker oxidants, such as ferric oxide or ...
carboxylic acid. −. ,. H. −. N. +. ,. R. 2. R. 1. ,. −. H. +. R. 3. −. COO. −. ⏟. substituted-ammonium. carboxylate salt. →. d ... Reductive amination with formic acid and formaldehyde via an imine intermediate Reactions[edit]. Alkylation, acylation, and ... 3) are the most common positively charged moieties in proteins, specifically in the amino acid lysine.[16] The anionic polymer ... Because amines are basic, they neutralize acids to form the corresponding ammonium salts R3NH+. When formed from carboxylic ...
Valerian constituents (e.g., isovaleric acid, isovaleramide, valerenic acid, valerenol). *Unsorted benzodiazepine site positive ... Ethylene is biosynthesized from the amino acid methionine to S-adenosyl-L-methionine (SAM, also called Adomet) by the enzyme ... Ethylene appears to have been discovered by Johann Joachim Becher, who obtained it by heating ethanol with sulfuric acid;[48] ... The main method practiced since the mid-1990s is the direct hydration of ethylene catalyzed by solid acid catalysts:[14] ...
... and a small amount of organic sulfonic acid,[20] and variations on the compound n-butyl cyanoacrylate for medical applications[ ...
They can be made by reacting a carboxylic acid with an alcohol with some acid. ... Phosphonous and Phosphonic acid. *Pyridine derivative. *Selenol. *Selenonic acid. *Sulfone. *Sulfonic acid ...
However, since the concentration of the sulphonic acid in the resin is high, the hydrogen of HCl has no tendency to enter the ... The ion resins were impregnated with silver ions, which were then exposed to various acids (silicic acid) to elute fatty acids ... and sulfonic acid (S, -SO2OH), which is a cation exchanger.[29] These types of exchangers can maintain their charge density ... The amino acids that have negatively charged side chains at pH 7 (pH of water) are glutamate and aspartate. The beads that are ...
... linoleic acid and alpha-linolenic acid) and singly allylic sites (oleic acid) ... Compounds containing the C=C−CH2−C=C linkages, e.g. linoleic acid derivatives, are prone to autoxidation, which can lead to ...
The method was invented in the 1930s.[25] Amines, alcohols, carboxylic acids, and sulfonic acids are converted to the ... Cathodic reduction of a carboxylic acid (oxalic acid) to an aldehyde (glyoxylic acid, shows as the rare aldehyde form) in a ... Originally phenylpropanoic acid could be prepared from reduction of cinnamic acid by electrolysis.[21] ... Propiolic acid is prepared commercially by oxidizing propargyl alcohol at a lead electrode.[12][dubious - discuss]. ...
More aggressive oxidants convert cysteine to the corresponding sulfinic acid and sulfonic acid. Cysteine residues play a ... and glutamic acid. While glutamic acid is usually sufficient because amino acid nitrogen is recycled through glutamate as an ... Cysteine (symbol Cys or C;[3] /ˈsɪstiiːn/)[4] is a semiessential[5] proteinogenic amino acid with the formula HO2CCH(NH2)CH2SH ... "Amino Acid Properties and Consequences of Substitutions, In: Bioinformatics for Geneticists. Wiley. Retrieved 2012-09-16.. ...
Sulfuric acid is a typical catalyst for this reaction. Many other acids are also used such as polymeric sulfonic acids. Since ... Silicotungstic acid is used to manufacture ethyl acetate by the alkylation of acetic acid by ethylene: C2H4 + CH3CO2H → CH3CO2C ... Addition of carboxylic acids to alkenes and alkynes[edit]. In the presence of palladium-based catalysts, ethylene, acetic acid ... Inorganic acids that exist as tautomers form diverse esters *phosphorous acid forms two kinds of phosphite esters, e.g. ...
Sulfonic acids, which are organic oxyacids, are a class of strong acids. A common example is toluenesulfonic acid (tosylic acid ... Common acids. Mineral acids (inorganic acids). *Hydrogen halides and their solutions: hydrofluoric acid (HF), hydrochloric acid ... See also: Acid dissociation constant § Monoprotic acids. Polyprotic acids. Polyprotic acids, also known as polybasic acids, are ... Examples of strong acids are hydrochloric acid (HCl), hydroiodic acid (HI), hydrobromic acid (HBr), perchloric acid (HClO4), ...
Phosphonous and Phosphonic acid. *Pyridine derivative. *Selenol. *Selenonic acid. *Sulfone. *Sulfonic acid ...
It is often said the resonance stability of phenol makes it a stronger acid than that of aliphatic alcohols such as ethanol (pK ... Most common among natural products is the amino acid phenylalanine, which contains a phenyl group. A major product of the ...
Alkenes engage in an acid catalysed hydration reaction using concentrated sulfuric acid as a catalyst that gives usually ... More complex alcohols however are pervasive, as manifested in sugars, some amino acids, and fatty acids. ... the names ethanol ethanal and ethanoic acid or simply ethane acid would then stand for the OH, COH and COOH derivatives of ... If a higher priority group is present (such as an aldehyde, ketone, or carboxylic acid), then the prefix hydroxy-is used,[14] e ...
More aggressive oxidants convert cysteine to the corresponding sulfinic acid and sulfonic acid. Cysteine residues play a ... so it must be biosynthesized from its constituent amino acids, cysteine, glycine and glutamic acid. Glutamic acid and glycine ... Cysteine (symbol Cys or C;[3] /ˈsɪstiiːn/)[4] is a semi-essential[5] proteinogenic amino acid with the formula HO2CCH(NH2)CH2SH ... "Amino Acid Properties and Consequences of Substitutions, In: Bioinformatics for Geneticists. Wiley. Retrieved 2012-09-16.. ...
Strong cation exchange sorbents contain aliphatic sulfonic acid groups that are always negatively charged in aqueous solution, ... and sulfonic acid or carboxyl groups (for cation exchange).[3] Solid-phase microextraction[edit]. Solid-phase microextraction ( ... such as acids. Strong anion exchange sorbents contain quaternary ammonium groups that have a permanent positive charge in ... to recover a strong acid a weak anion exchange cartridge should be used. To elute the analyte from either the strong or weak ...
Although ethers resist hydrolysis, their polar bonds are cloven by mineral acids such as hydrobromic acid and hydroiodic acid. ... Acid-catalyzed ring-opening polymerization of tetrahydrofuran. -CH. 2CH. 2CH. 2CH. 2O-. Terathane from Invista and PolyTHF from ... The reaction is catalyzed by acids, usually sulfuric acid. The method is effective for generating symmetrical ethers, but not ... Acid catalysis is required for this reaction. Often, mercury trifluoroacetate (Hg(OCOCF3)2) is used as a catalyst for the ...
Some azo compounds, e.g., methyl orange, are used as acid-base indicators due to the different colors of their acid and salt ...
Amino Acids and Enzymes Buffers & Salts Nucleosides and Nucleotides Specialty Chemicals >> View All Empowered Products. New ... Amino Acids and Enzymes Buffers and Salts Nucleosides and Nucleotides Specialty Chemicals >> View All Empowered Products ...
Amino Acids and Enzymes Buffers & Salts Nucleosides and Nucleotides Specialty Chemicals >> View All Empowered Products. New ... Amino Acids and Enzymes Buffers and Salts Nucleosides and Nucleotides Specialty Chemicals >> View All Empowered Products ...
Amino Acids and Enzymes Buffers & Salts Nucleosides and Nucleotides Specialty Chemicals >> View All Empowered Products. New ... Amino Acids and Enzymes Buffers and Salts Nucleosides and Nucleotides Specialty Chemicals >> View All Empowered Products ...
Amino Acids and Enzymes Buffers & Salts Nucleosides and Nucleotides Specialty Chemicals >> View All Empowered Products. New ... Amino Acids and Enzymes Buffers and Salts Nucleosides and Nucleotides Specialty Chemicals >> View All Empowered Products ...
Amino Acids and Enzymes Buffers & Salts Nucleosides and Nucleotides Specialty Chemicals >> View All Empowered Products. New ... Amino Acids and Enzymes Buffers and Salts Nucleosides and Nucleotides Specialty Chemicals >> View All Empowered Products ...
  • the free acids are widely used as catalysts in organic syntheses, while the salts and other derivatives form the basis of the manufacture of detergents, water-soluble dyes and catalysts , sulfonamide pharmaceuticals, and ion-exchange resins . (
  • Such operations are conducted on a manufacturing scale in the preparation of the sodium salts of TPPTS (used in catalysts as described above), in the preparation of alkylated benzenesulfonic acids (used as synthetic detergents), and in the preparation of anthraquinonesulfonic acid (used in the manufacture of alizarin and other dyes). (
  • They are also usually colourless and nonoxidizing, which makes them suitable for use as acid catalysts in organic reactions. (
  • Two different heterogeneous catalysts carrying aryl-sulfonic moieties, in which the aromatic ring was either fluorinated or not, were successfully synthesized. (
  • The esterification of glycerol with lauric and oleic acids (1 : 1 molar ratio) has been carried out by using hybrid MCM-41 materials containing simultaneously alkyl (methyl or propyl) and sulfonic acid groups as catalysts. (
  • Sodium salts of long-chain aliphatic or aromatic sulfonic acids are used as detergents. (
  • Aromatic sulfonic acids are particularly useful as intermediates or starting materials in synthesis-for example, in the preparation of phenols . (
  • Aromatic sulfonic acids are obtained generally by treating aromatic compounds with concentrated sulfuric acid and added sulfur trioxide ("oleum"), the process being called sulfonation . (
  • A large scale application of this method is the production of alkylbenzenesulfonic acids: RC6H5 + SO3 → RC6H4SO3H In this reaction, sulfur trioxide is an electrophile and the arene undergoes electrophilic aromatic substitution. (
  • Although both alkyl and aryl sulfonic acids are known, most of the applications are associated with the aromatic derivatives. (
  • with(B) aromatic isocyanato sulfonic acids, wherein the equivalent ratio of the total quantity of isocyanate groups (including any isocyanate groups present in dimerized form) to sulfonic acid groups is from 0.5:1 to 50:1 and the equivalent ratio of the sum of hydroxyl groups in (A) to NCO groups is from 1.5:1 to 30:1. (
  • The instant invention is directed to a process wherein polyhydroxyl compounds are reacted with sub-equivalent molar quantities of aromatic isocyanatosulfonic acids, optionally in admixture with conventional polyisocyanates. (
  • Linear alkyl benzene sulfonic acid are complex mixtures of homologues of different alkyl chain lengths (C10 to C13 or C14) and phenyl positional isomers of 2 to 5-phenyl in proportions dictated by the starting materials and reaction conditions, each containing an aromatic ring sulfonated at the para position and attached to a linear alkyl chain at any position with the exception of terminal one (1-phenyl). (
  • A straightforward and efficient method for the synthesis of pyrano[2,3-d]pyrimidine diones derivatives from the reaction of barbituric acid, malononitrile and various aromatic aldehydes using SBA-Pr-SO3H as a nanocatalyst is reported. (
  • Convenient and simple, sequential diazotization-iodination of aromatic amines with NaNO 2 /KI in the presence of a sulfonic acid based cation-exchange resin in water is an inexpensive, noncorrosive and eco-friendly synthetic route, that allows the preparation of various electron-rich and deficient iodoarenes in good yields. (
  • Labsa 96% linear alkyl benzene sulfonic acid. (
  • Linear alkyl benzene sulfonic acid, alias: dodecyl benzene sulfonic acid, molecular formula C18H30O3S, molecular weight 326.49, brown viscous liquid, organic weak acid;It is corrosive to a certain extent, strongly irritating to skin and eyes, soluble in water and diluted with water to generate heat;Insoluble in general organic solvents, mainly used as detergent raw materials. (
  • Because sulfonic acids are so acidic, they generally exist as their salts and thus tend to be quite soluble in water. (
  • The most important use of sulfonic acid salts (sulfonates) is in the detergent industry. (
  • Unlike ordinary soaps , which contain carboxylic acid salts, soaps containing sulfonates do not form a scum in hard water because the calcium and magnesium ions present in the hard water do not form insoluble precipitates with sulfonates as they do with carboxylates. (
  • The pesticidal properties of a large number of different sulfonic acids, their salts, esters, amides, and other derivatives have been studied, and among them have been found compounds with high physiological activity. (
  • The free sulfonic acids and their salts with metals and nitrogenous bases do not show contact insecticidal and acaricidal properties, but some sulfonic acids of the triphenylmethane series and substituted arylureas are active mothproofing agents. (
  • The salts of sulfanilic acid and related compounds have a fungicidal effect against rust of grains, but the mechanism of this action is still not entirely clear. (
  • Because the sulfonic acids are frequently used in the form of their sodium salts, sulfonation is usually followed by neutralization with sodium hydroxide or sodium carbonate . (
  • Salts or esters of sulfonic acids are called sulfonates. (
  • The use of alkali metal, alkaline earth metal, ammonium and substituted ammonium salts of alkyl and alkanol sulfonic acids as additives in pure metal and metal alloy sulfonic acid electroplating baths has a number of unexpected benefits including wider useful current density range, improved appearance and in the case of tin improved oxidative stability. (
  • An additional significant appearance is to reduce the overall costs of this type of bath with the more economical salts of alkyl and alkanol sulfonic acids. (
  • 1. A method of improving the plating performance of sulfonic acid based electroplating baths, comprising the step of replacing at least a portion of the alkyl sulfonic acidelectrolyte with a salt of an alkanol sulfonic acid or of a mixture of an alkyl sulfonic acid and an alkanol sulfonic acid, wherein the replacement salt is selected from the group consisting of alkali metal, alkaline earth metal, and ammonium orsubstituted ammonium salts. (
  • and (c) a salt of a mixture of an alkyl sulfonic acid and alkanol sulfonic acid in an amount to improve the plating performance of the aqueous sulphonic acid electroplating baths, wherein the salt is selected from the group consisting of alkalimetal, alkaline earth metal, and ammonium or substituted ammonium salts. (
  • The literature on saturated amino sulfonic acids with primary/secondary amino group and their derivatives from XIX century to 2016 is surveyed, focusing mainly on results published in the last two decades. (
  • Synthesis of saturated amino sulfonic acids and their derivatives, their occurrence among natural products, as well as their use for design of peptidomimetics, conjugates with various molecules of practical significance, applications as building blocks for drug discovery and for other reasons are discussed. (
  • Direct sulfonation also converts methanesulfonic acid to methanedisulfonic acid. (
  • For example, p-Toluenesulfonic acid and methanesulfonic acid have pKa values of −2.8 and −1.9, respectively, while those of benzoic acid and acetic acid are 4.20 and 4.76, respectively. (
  • For instance, various sources have reported the pKa of methanesulfonic acid to be as high as −0.6 or as low as −6.5. (
  • The structure of sulfonic acids is illustrated by the prototype, methanesulfonic acid. (
  • Ball-and-stick model of methanesulfonic acid. (
  • 9. A method of increasing the useful upper current density range of a tin/lead methane/methanol sulfonate plating bath and thereby allowing plating at higher speeds, said method comprising the step of replacing at least a portion of the methanesulfonic acid with sodium isethionate. (
  • Sulfur-33 enrichments observed in methanesulfonic acid could have resulted from gas-phase ultraviolet irradiation of a precursor, carbon disulfide. (
  • 2. The method of claim 1, wherein the sulfonic acid is an alkyl sulfonic acid. (
  • Hydroxyethylpiperazine Ethane Sulfonic Acid is a heterocyclic compound. (
  • Magnetic nanoparticles functionalized ethane sulfonic acid (MNESA): as an efficient catalyst in. (
  • We offer optimal quality Para Toluene Sulfonic Acid which is made up of best quality chemicals. (
  • The Para Toluene Sulfonic Acid we supply and export is made from extremely pure substances. (
  • Thus, our Para Toluene Sulfonic Acid is well known for high efficacy. (
  • The Para Toluene Sulfonic Acid we offer is available at market leading prices. (
  • We are Manufacturers and Exporters of Para Toluene Sulfonic Acid. (
  • we are a renowned Supplier of Para Toluene Sulfonic Acid. (
  • Para Toluene sulfonic acid (PTSA or pTsOH) or tosylic acid (TsOH) is an organic compound with the formula CH3C6H4SO3H. (
  • The present study aimed to investigate the protective effects of magnolol on acute 2,4,6-trinitrobenzene sulfonic acid (TNBS)‑induced colitis, and its underlying mechanisms. (
  • A rectal enema of trinitrobenzene sulfonic acid (TNBS) (100 mg/kg) was applied to BALB/c mice. (
  • Efficacy of topical versus oral 5-aminosalicylate for treatment of 2,4,6-trinitrobenzene sulfonic acid-induced ulcerative colitis in rats. (
  • A flexible tube was inserted into the rat cecum to establish a topical administration model of 2,4,6-trinitrobenzene sulfonic acid (TNBS)-induced UC. (
  • A sulfonic acid can be thought of as sulfuric acid with one hydroxyl group replaced by an organic substituent. (
  • The overall geometry of the sulfur centre is reminiscent of the shape of sulfuric acid. (
  • The compound is prepared by sulfonation of naphthalene with sulfuric acid, however under equilibrating conditions that allow the 1-sulfonic acid isomer to convert to the more stable 2-sulfonic acid. (
  • Customers choose MSA LC as a higher-performing alternative acid that avoids the corrosion problems that arise when inorganic acids, such as sulfuric acid and hydrochloric acid, are used in pre-esterification . (
  • Other sulfonation alternative reagents are sulfuric acid, diluted sulfur trioxide, chlorosulfonic acid and sulfamic acid on falling film reactors. (
  • The major raw materials for LABSA are LAB, sulfuric acid and other auxiliary chemicals. (
  • Molecular Weight 303 Empirical Formula C7H11NO7S Synonyms 2 Naphthylamine 1-5 Disulfonic Acid Form Supplied Wet Powder Basis For Sale On Real Contant (M.W. 303) Strength Min. (
  • ACID SODIUM SALT Synonyms: SODIUM DL- 10 -CAMPHORSULFONATE;SODIUM CAMPHORSULPHONATE;7,7-dimethyl-2-oxo-,sodiumsalt,(±)-Biscyclo[2.2.1. (
  • Triflic acid, one of the strongest known organic acids, is used as a polymerization catalyst and in fuel cells , in gasoline production, and in the synthesis of organic and organometallic compounds . (
  • MSA LC is a strong acid esterification catalyst that improves yield for biodiesel producers using advantaged feeds, with significantly reduced corrosivity toward stainless steel materials. (
  • It is most useful as acid-catalyst reaction such as esterification condensation acetylation polymerization alkylation's hydrolysis dehydration. (
  • Different biomaterials have been chosen, with a view to select the most active solid acid catalyst . (
  • It has been found that for each fatty acid the catalyst activity is affected by the concentration of methyl groups, and maximum activity per sulfonic acid group is achieved by tuning the methyl/sulfonic acid ratio. (
  • Reduction of the average pore size (determined by N2 adsorption) from 14 to below 10 Å has a detrimental influence on the catalyst activity for both acids. (
  • The heterogeneous silica gel/sulfonic acid catalyst can be recycled without significant loss of activity. (
  • Is selective heating of the sulfonic acid catalyst AC-SO3H by microwave radiation crucial in the acid hydrolysis of cellulose to glucose in aqueous media? (
  • Kiani Moghadam, Faeze 2016-03-28 00:00:00 This paper reports an efficient heterogeneous catalyst based on sulfonic acid functionalization of magnetic nanoparticles. (
  • This paper reports an efficient heterogeneous catalyst based on sulfonic acid functionalization of magnetic nanoparticles. (
  • Substitution of both hydrogen of barbituric acid with methyl group will convert inhibitor to activator. (
  • The ' Global and Chinese (2S-Trans)-3-Amino-2-Methyl-4-Oxoaze Tidine-1-Sulphonic Acid Industry, 2011-2021 Market Research Report ' is a professional and in-depth study on the current state of the global (2S-Trans)-3-Amino-2-Methyl-4-Oxoaze Tidine-1-Sulphonic Acid industry with a focus on the Chinese market. (
  • The report provides key statistics on the market status of the (2S-Trans)-3-Amino-2-Methyl-4-Oxoaze Tidine-1-Sulphonic Acid manufacturers and is a valuable source of guidance and direction for companies and individuals interested in the industry.Firstly, the report provides a basic overview of the industry including its definition, applications and manufacturing technology. (
  • Through the statistical analysis, the report depicts the global and Chinese total market of (2S-Trans)-3-Amino-2-Methyl-4-Oxoaze Tidine-1-Sulphonic Acid industry including capacity, production, production value, cost/profit, supply/demand and Chinese import/export. (
  • The report then estimates 2016-2021 market development trends of (2S-Trans)-3-Amino-2-Methyl-4-Oxoaze Tidine-1-Sulphonic Acid industry. (
  • In the end, the report makes some important proposals for a new project of (2S-Trans)-3-Amino-2-Methyl-4-Oxoaze Tidine-1-Sulphonic Acid Industry before evaluating its feasibility. (
  • Overall, the report provides an in-depth insight of 2011-2021 global and Chinese (2S-Trans)-3-Amino-2-Methyl-4-Oxoaze Tidine-1-Sulphonic Acid industry covering all important parameters. (
  • Sulfonic acids are produced by the process of sulfonation. (
  • sulfonic acid groups were introduced by mild post-sulfonation exclusively on the para-position of the pendant phenyl ring in PHQ. (
  • Amorphous carbon - silica composites bearing sulfonic acid derived from inexpensive natural organic compounds ( glucose , maltose , cellulose, chitosan and starch ) were prepared by partial carbonization followed by sulfonation and their catalytic activity was evaluated for the protection of aldehydes as 1,1-diacetates and for N -, O - and S -acylations under solvent-free conditions. (
  • Global Dinonyl Naphthalene Sulfonic Acid Market 2017 Industry. (
  • Qyresearchreports include new market research report "Global Dinonyl Naphthalene Sulfonic Acid Sales Market Report 2017" to its huge collection of research reports. (
  • A new research study presents a comprehensive analysis and understanding of the global Dinonyl Naphthalene Sulfonic Acid market . (
  • The research report also offers an-depth analysis of the global Dinonyl Naphthalene Sulfonic Acid market, focusing on the product portfolio, primary applications, latest developments, regional segmentation, and the competitive scenario of the overall market. (
  • This is expected to help the readers and players in gaining a strong understanding of the Dinonyl Naphthalene Sulfonic Acid market across the globe. (
  • The research study addresses important questions related to the development in the global Dinonyl Naphthalene Sulfonic Acid market. (
  • What are the vital factors augmenting the global Dinonyl Naphthalene Sulfonic Acid market? (
  • Which primary factors are projected to restrict the development of the global Dinonyl Naphthalene Sulfonic Acid market? (
  • Which technological developments are likely to encourage the growth of the global Dinonyl Naphthalene Sulfonic Acid market? (
  • What are the anticipated value and growth rate of the global Dinonyl Naphthalene Sulfonic Acid market? (
  • How is the competitive landscape of the global Dinonyl Naphthalene Sulfonic Acid market? (
  • Which are the leading players operating in the global Dinonyl Naphthalene Sulfonic Acid market? (
  • The research report has offered a thorough study of the competitive scenario of the global Dinonyl Naphthalene Sulfonic Acid market. (
  • The strategies and tactics that are used by the key players have been highlighted in order to guide the new players of the global Dinonyl Naphthalene Sulfonic Acid market. (
  • Naphthalene-2-sulfonic acid is an organic compound with the formula C10H7SO3H. (
  • It is one of two monosulfonic acids of naphthalene, the other being naphthalene-1-sulfonic acid. (
  • Naphthalene-2-sulfonic acid undergoes many reactions, some of which are or were of commercial interest. (
  • It is an intermediate in the formation of 2,6-, 2,7- and 1,6-naphthalene disulfonic acids as well as 1,3,6-naphthalenetrisulfonic acid. (
  • Naphthalene-2-sulfonic acid condenses with formaldehyde to give polymeric sulfonic acids. (
  • Naphthalene sulfonic acid, reaction products. (
  • The global market size of 2-Naphthalene Sulfonic Acid is $XX million in 2017 with XX CAGR from 2013 to 2017, and it is expected to reach $XX million by the end of 2023 with a CAGR of XX% from 2018 to 2023. (
  • For competitor segment, the report includes global key players of 2-Naphthalene Sulfonic Acid as well as some small players. (
  • The therapeutic potency of rAS3 was evaluated in the 2,4,6-trinitrobenzene sulphonic acid (TNBS) induced colitis model of the rat. (
  • METHODS Colitis was induced by an intrarectal instillation of trinitrobenzene sulphonic acid (TNBS, 60 mg/ml, 30% ethanol), in wild type (control) or iNOS deficient mice. (
  • In this study, we induced a chronic experimental colitis, in both wild type and iNOS deficient mice, by using the hap- ten 2,4,6-trinitrobenzene sulphonic acid (TNBS). (
  • Explain why benzene sulfonic acid is a Brønsted acid. (
  • 2. Used as raw material for detergents, and used in the production of ammonium salt, sodium salt and calcium salt of alkyl benzene sulfonic acid, etc. (
  • Global Linear Alkyl Benzene Sulphonic Acid Market Report 2018 aims to fulfill the needs of the clients looking for a fresh outlook towards the Global Linear Alkyl Benzene Sulphonic Acid Market, or fill in the knowledge gaps with the data available in the report. (
  • Linear Alkyl Benzene Sulphonic Acid is an anionic surfactant with molecules characterized by a hydrophobic and a hydrophilic group. (
  • The properties of linear alkyl benzene sulfonic differ in physical and chemical properties according to the alkyl chain length, resulting in formulations for various applications. (
  • There are 15 Chapters to deeply display the global Linear Alkyl Benzene Sulphonic Acid market. (
  • The ' Global and Chinese Nitro benzene sulfonic acid sodium salt Industry, 2011-2021 Market Research Report ' is a professional and in-depth study on the current state of the global Nitro benzene sulfonic acid sodium salt industry with a focus on the Chinese market. (
  • The report provides key statistics on the market status of the Nitro benzene sulfonic acid sodium salt manufacturers and is a valuable source of guidance and direction for companies and individuals interested in the industry.Firstly, the report provides a basic overview of the industry including its definition, applications and manufacturing technology. (
  • Through the statistical analysis, the report depicts the global and Chinese total market of Nitro benzene sulfonic acid sodium salt industry including capacity, production, production value, cost/profit, supply/demand and Chinese import/export. (
  • The report then estimates 2016-2021 market development trends of Nitro benzene sulfonic acid sodium salt industry. (
  • In the end, the report makes some important proposals for a new project of Nitro benzene sulfonic acid sodium salt Industry before evaluating its feasibility. (
  • Overall, the report provides an in-depth insight of 2011-2021 global and Chinese Nitro benzene sulfonic acid sodium salt industry covering all important parameters. (
  • 5.2 Market Competition of Nitro benzene sulfonic acid sodium salt Industry by Country (USA, EU, Japan, Chinese etc. (
  • This report studies the global Linear Alkyl Benzene Sulphonic Acid market status and forecast, categorizes the global Linear Alkyl Benzene Sulphonic Acid market size (value & volume) by manufacturers, type, application, and region. (
  • The global Linear Alkyl Benzene Sulphonic Acid market is valued at 3360 million US$ in 2017 and will reach 4420 million US$ by the end of 2025, growing at a CAGR of 3.5% during 2018-2025. (
  • Focuses on the key Linear Alkyl Benzene Sulphonic Acid manufacturers, to study the capacity, production, value, market share and development plans in future. (
  • Nafion, a polymeric sulfonic acid useful in fuel cells. (
  • Sulfonic acid groups are often introduced into organic molecules such as dyes to stabilize them for use in aqueous dye baths. (
  • Sulfonic acid groups also improve the washfastness of wool and silk dyes by enabling the dye to bind more tightly to the fabric. (
  • The compound is mainly used in the production of dyes via nitration en route to aminonaphthalenesulfonic acids. (
  • 4-Amino-3-hydroxy-1-naphthalenesulfonic acid is used as mordant dyes and acid dyes intermediate. (
  • The instant invention is directed to compounds having an average molecular weight of from 300 to 12,000, containing: at least one hydroxyl group and at least one urethano-aryl-sulfonic acid group and a method for their preparation. (
  • The process is characterized as a process for the preparation of compounds having a number average molecular weight of from 300 to 12,000 having at least one hydroxyl group and at least one urethano-aryl-sulfonic acid group, comprising: reacting at from (
  • Preliminary results indicated superior performances for the fluoro-aryl-sulfonic acid, compared to the non-fluorinated sample. (
  • Linear Alkylbenzene Sulfonic Acid (Labsa) 90% & 96% in SAMRAT INDL. (
  • We are Making, Exporting and Supplying Linear Alkylbenzene Sulfonic Acid (Labsa) 90% & 96% in Porbandar, Gujarat, India. (
  • Triflic acid is manufactured by electrochemical fluorination of methanesulfonyl chloride or fluoride. (
  • Similarly the sulfonyl chloride derived from polyethylene is hydrolyzed to the sulfonic acid. (
  • Sulfonic acids are known to react with solid sodium chloride (salt) to form the sodium sulfonate and hydrogen chloride. (
  • For this purpose, chloride based (pH ~5) and methane sulfonic acid (MSA, pH ~0.5) electrolytes, including ABN, were prepared. (
  • Zajkoska SP, Mulone A, Hansal WEG, Klement U, Mann R, Kautek W. Alkoxylated β-Naphthol as an Additive for Tin Plating from Chloride and Methane Sulfonic Acid Electrolytes. (
  • Arkema's sulfonyls range includes MSA (methane sulfonic acid - CAS 75-75-2) and MSC (methane sulfonic chloride - CAS 124-63-0) with various grades adapted to customer's applications. (
  • We are also one of the recommended P-Toulene Sulfonic Acid Exporters and suppliers in India. (
  • morpholinopropane sulfonic acid manufacturers and suppliers with contacts and product range are mentioned in the study. (
  • All Verified lignin sulfonic acid suppliers & lignin sulfonic acid manufacturers have passed our Business License Check, they can provide quality lignin sulfonic acid products. (
  • Mohammadi, Ali A. Reaction of 4-amino-3-hydroxy-1-naphthalenesulfonic acid with orthoesters: a new facile one-pot synthesis of 2-substituted naphth[1,2-d]oxazole-5-sulfonates. (
  • A glassy carbon electrode (GCE) was modified with electropolymerized film of 4-amino-3-hydroxynaphthalene sulfonic acid (AHNSA) in 0.1 M HNO 3 . (
  • This report is an essential reference for who looks for detailed information on US 2-Amino-8-naphthol-6-sulfonic acid market. (
  • In addition to the data part, the report also provides overview of 2-Amino-8-naphthol-6-sulfonic acid market, including classification, application, manufacturing technology, industry chain analysis and latest market dynamics. (
  • The 'Global and Chinese 2-Amino Toluene-5-Sulfonic Acid Industry, 2013-2023 Market Research Report' is a professional and in-depth study on the current state of the global 2-Amino Toluene-5-Sulfonic Acid industry with a focus on the Chinese market. (
  • The report then estimates 2018-2023 market development trends of 2-Amino Toluene-5-Sulfonic Acid industry. (
  • Overall, the report provides an in-depth insight of 2013-2023 global and Chinese 2-Amino Toluene-5-Sulfonic Acid industry covering all important parameters. (
  • 5.2 Market Competition of 2-Amino Toluene-5-Sulfonic Acid Industry by Country (USA, EU, Japan, Chinese etc. (
  • Besides, the amphiphilic properties of fluorinated compounds such as PFOS and perfluorohexanoic acid (PFHxA) suggest a role in increasing cell membrane permeability and solubilizing chemicals. (
  • Traditionally, soaps are the popular surfactants, being derived from fatty acids. (
  • Among the various methods used to prepare aliphatic sulfonic acids are the oxidation of other organosulfur compounds, the reaction of alkyl halides and metallic sulfites, and the reaction of organometallic compounds with amine complexes of sulfur trioxide (e.g. (
  • Vinylsulfonic acid is derived by hydrolysis of carbyl sulfate, (C2H4(SO3)2), which in turn is obtain by the addition of sulfur trioxide to ethylene. (
  • p-Toluenesulfonic acid, a widely used reagent in organic synthesis. (
  • An, L.-T., Zou, J.-P. and Zhang, L.-L. (2008) Polymer-Supported Sulphonic Acid Catalyzed Cross-Aldol Condensation An Expeditious Synthesis of α, α'-bis(substituted Benzylidene) Cycloalkanones. (
  • A highly efficient one-pot synthesis of Hantzsch 1,4-dihydropyridines is catalyzed by sulfonic acid covalently anchored onto the surface of silica gel. (
  • The findings hereby reported open new avenues for the design of heterogeneous sulfonic acids with superior reactivity in acid-catalyzed reactions. (
  • Sulfonic acid , sulfonic also spelled sulphonic , any of a class of organic acids containing sulfur and having the general formula RSO 3 H , in which R is an organic combining group. (
  • A sulfonic acid (or sulphonic acid) refers to a member of the class of organosulfur compounds with the general formula R−S(=O)2−OH, where R is an organic alkyl or aryl group and the S(=O)2(OH) group a sulfonyl hydroxide. (
  • The parent compound (with the organic substituent replaced by hydrogen) is the parent sulfonic acid, HS(=O)2(OH), a tautomer of sulfurous acid, S(=O)(OH)2. (
  • PTSA is comparable in strength to mineral acids such as Sulphuric acid, but are especially suitable for organic reactions where an inorganic, mineral acid could cause charring, oxidation, or an unwanted chemical reaction. (
  • Intramolecular carbon, hydrogen, and sulfur isotope ratios were measured on a homologous series of organic sulfonic acids discovered in the Murchison meteorite. (
  • N-(Iodoacetylaminoethyl)-8-Naphthylamine-1-Sulfonic Acid is a fluorescent sulfhydryl reagent that is sensitive to photo catalyzed degradation in aqueous solution and organic solvents. (
  • Perfluorooctane sulfonic acid (PFOS) and 3,3′,4,4′,5-pentachlorobiphenyl (PCB126) are persistent organic pollutants of high concern because of their environmental persistence, bioaccumulation and toxic properties. (
  • The chemically modified guar gum sulphonic acid (GSA) resin was used for removal and pre-concentration of Zn 2+ , Cd 2+ , Fe 2+ , Pb 2+ and Cu 2+ ions in aqueous solutions and steel industry effluent from Jodhpur, India. (
  • The effects of halogenation of polystyrene sulfonic acid resins on acidic and catalytic properties have been evaluated. (
  • Four polystyrene-co-divinylbenzene sulfonic acid resins from Rohm and Haas (Amberlyst 70, Amberlyst 15, Amberlyst 35 and Amberlyst 36) have been characterised in terms of their acidities (both strength and acid site concentrations) by ammonia adsorption flow microcalorimetry, their thermal and hydrothermal stabilities, and their catalytic activities in two test reactions, the isomerisation of α-pinene and the benzylation of toluene using benzyl alcohol. (
  • Amberlyst 70, which is reported to be halogenated and is claimed to exhibit better thermal stability than the other three resins, shows acid site strengths similar to those of the over-sulfonated Amberlysts 35 and 36, and shows significantly better thermal and hydrothermal stability. (
  • and (B) hydroxyl compounds having an average molecular weight of 300 to 12,000 and containing a urethanoaryl-sulfonic acid group, said hydroxyl compounds being prepared by reacting at from (
  • soluble in water,slightly soluble in acetic acid , ethyl acetate.Has strong odor. (
  • Many alkane sulfonic acids are obtained from bisulfite, which adds to terminal alkenes or is alkylated by alkyl halides: HSO3− + RCH=CH2 + H+ → RCH2CH2SO3H HSO3− + RBr → RSO3H + Br− Sulfonic acids can be prepared by oxidation of thiols: RSH + 3⁄2 O2 → RSO3H Such a pathway is the basis of the biosynthesis of taurine. (
  • Noble Metal Resistors in Microcircuits, "The Mechanism of the Inhibition of Stannous-Ion Oxidation by Phenolsulfonic Acid",vol. 2, No. 9-10, Sep. (
  • However, while carboxylic acids are weak (with dissociation constants of about 10 −5 ), sulfonic acids are considered strong acids (with dissociation constants of about 10 −2 ). (
  • Sulfonic acid groups can greatly enhance the water solubility of compounds , as seen with the sulfonic acid derivative of triphenyl phosphine (TPPTS), P(C 6 H 4 -m-SO 3 Na) 3 . (
  • The sulfonic and oxanilic metabolites were present in almost 75% of the groundwater samples and were generally present from 3 to 45 times more frequently than their parent compounds. (
  • Losartan Reduces Trinitrobenzene Sulphonic Acid-Induced Colorectal Fibrosis in Rats," Canadian Journal of Gastroenterology , vol. 26, no. 1, pp. 33-39, 2012. (
  • DIGITAL.CSIC: Combined Alkyl and Sulfonic Acid Functionalization of MCM-41-Type Silica: Part 2. (
  • Combined Alkyl and Sulfonic Acid Functionalization of MCM-41-Type Silica: Part 2. (
  • A copoly(arylene ether) (PAE) with high fluorine content and a copoly(arylene ether nitrile) (PAEN) with high nitrile content, each containing pendant phenyl sulfonic acids were synthesized. (
  • Benzenesulfonic Acid, C14-24-Branched And Linear Alkyl Derivs. (
  • Many sulfonic acids are prepared by hydrolysis of sulfonyl halides and related precursors. (
  • Linear alkylbenzene sulfonic acid is the largest-volume synthetic surfactant because of its relatively low cost, good performance, the fact that it can be dried to a stable powder and the biodegradable environmental friendliness as it has straight chain. (
  • Morpholinopropane sulfonic acid (CAS 1132-61-2) Market Research Report 2018 contents were worked out and placed on the website in January, 2018. (
  • Please note that Morpholinopropane sulfonic acid (CAS 1132-61-2) Market Research Report 2018 is a half ready publication and contents are subject to change. (
  • Representative sulfonic acids and sulfonates Taurine, a bile acid, and one of the few naturally occurring sulfonic acids (shown in uncommon tautomer). (
  • Here a positively charged ruthenium metal complex ([Ru(bpy)(3)](2+)) is immobilised on all electrode surface by ion paring with a sulfonated conducting polymer poly(2-methoxyaniline-5-sulfonic acid), (PMAS). (