The invention relates to the use of an acid anhydride incorporated as a latentiated catalyst in poly(ortho ester) and other polymers such that upon exposure to aqueous environments the acid anhydride generates the corresponding acid which catalyzes the matrix erosion. The releasing rate of a loaded drug substance incorporated into or surrounded by the poly(ortho ester) or other polymers can be controlled in that the drug is released as the poly(ortho ester)s or other polymer is eroded by action of the acid anhydride incorporated therein.
The report generally describes phenyl boronic acid anhydride, examines its uses, production methods, patents. Phenyl boronic acid anhydride market situation
Retrospective exposure assessment using Bayesian methods.: This paper presents the application of a Bayesian framework for retrospective exposure assessment of
Looking for chlorendic anhydride? Find out information about chlorendic anhydride. C9H2Cl6O3 White, fine crystals used in fire-resistant polyester resins, in hardening epoxy resins, and as a chemical intermediate Explanation of chlorendic anhydride
Looking for caprylic anhydride? Find out information about caprylic anhydride. 2O A white solid that melts at -1°C; used as a chemical intermediate Explanation of caprylic anhydride
Mixed anhydrides of O-benzylbenzohydroximic acid have been prepared by acylation and sulfonylation of O-benzylbenzohydroxamic acid using a variety of acyl and sulfonyl halides in the presence of trimethylamine and pyridine in dioxane and benzene. Structure elucidation of the resulting products was performed by chemical and spectroscopic methods. All evidences indicate that the products have the mixed anhydride structure with (Z)-configuration. Corresponding (E)-isomer and the isomeric N-acylated or sulfonylated products, if formed, could not be isolated. Several mixed anhydrides showed antiparasitic activity.. ...
Bis(trifluoromethyl)thiophosphinic acid, (CF3)2P(S)OH, has been prepared by the reaction of concentrated sulfuric acid with salts of the acid. The new moderately strong monothio acid is stable in aqueous solution but yields 1 mol of CF3H per mole of acid upon alkaline hydrolysis. The acid has been characterized by chemical and spectroscopic methods including gas-phase infrared spectra which suggest that the acid has the (CF3)2P(S)OH structure. Dehydration of the acid with P4O10 proceeds smoothly to give good yields of the anhydride, ((CF3)2P(S))2O, which is extremely inert toward electrophilic reagents such as hydrogen halides and hydrogen sulfide. The infrared and nmr spectral properties of the acid and its anhydride are discussed. The anhydrides reactions are also discussed.(*ORGANIC PHOSPHORUS COMPOUNDS
term_id nAnno nGroup nOverlap zscore pvalue adjp GO:0016866 GO:0016866 11 73 3 2.18 0.011 0.3 GO:0050112 GO:0050112 20 73 4 1.79 0.025 0.3 GO:0016787 GO:0016787 112 73 15 1.85 0.026 0.3 GO:0016746 GO:0016746 14 73 3 1.68 0.028 0.3 GO:0004022 GO:0004022 21 73 4 1.68 0.031 0.3 GO:0015002 GO:0015002 38 73 6 1.56 0.042 0.3 GO:0004518 GO:0004518 16 73 3 1.42 0.044 0.3 GO:0016817 GO:0016817 31 73 5 1.47 0.047 0.3 GO:0016818 GO:0016818 31 73 5 1.47 0.047 0.3 GO:0016462 GO:0016462 31 73 5 1.47 0.047 0.3 term_name GO:0016866 intramolecular transferase activity GO:0050112 inositol 2-dehydrogenase activity GO:0016787 hydrolase activity GO:0016746 transferase activity, transferring acyl groups GO:0004022 alcohol dehydrogenase (NAD) activity GO:0015002 heme-copper terminal oxidase activity GO:0004518 nuclease activity GO:0016817 hydrolase activity, acting on acid anhydrides GO:0016818 hydrolase activity, acting on acid anhydrides, in phosphorus-containing anhydrides GO:0016462 pyrophosphatase activity ...
2-DECEN-1-YLSUCCINIC ANHYDRIDE 25447-83-0 Precursor and Downstream products, 2-DECEN-1-YLSUCCINIC ANHYDRIDE Precursor products, 2-DECEN-1-YLSUCCINIC ANHYDRIDE Downstream products ect.
5-Fluoroisatoic Anhydride 321-69-7 NMR spectrum, 5-Fluoroisatoic Anhydride H-NMR spectral analysis, 5-Fluoroisatoic Anhydride C-NMR spectral analysis ect.
PubMed comprises more than 30 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites.
cis-5-Norbornene-exo-2,3-dicarboxylic anhydride, 95%, ACROS Organics™ 5g; Glass bottle cis-5-Norbornene-exo-2,3-dicarboxylic anhydride, 95%, ACROS...
A coating composition useful for a finish for automobiles and trucks in which the film forming binder contains reactive binder components of about (a) 25-94% by weight, based on the weight of the binder, of an acrylic polymer having at least two reactive anhydride groups composed of polymerized monomers of an ethylenically unsaturated anhydride and polymerized monomers from the group consisting of alkyl methacrylate, alkyl acrylate and any mixtures thereof, wherein the alkyl groups have 1-8 carbon atoms and the polymer has a weight average molecular weight of about 2,000-50,000; (b) 5-50% by weight, based on the weight of the binder, of a glycidyl component having at least two reactive glycidyl groups; (c) 1-40% by weight, based on the weight of the binder, of a self-stabilized dispersed resin; and the composition contains about 0.1-5% by weight; based on the weight of the binder, of a catalyst.
Looking for 4,4-Oxydiphthalic Anhydride Odpa Cas: 1823-59-2, 1,4-Bis(3-Aminophenoxy)benzene (Tpe-R) Cas: 59326-56-6 products & leads in High Polymers, contact Chinatech (Tianjin) Chemical Co., Ltd to buy 4,4-Oxydiphthalic Anhydride Odpa Cas: 1823-59-2, 1,4-Bis(3-Aminophenoxy)benzene (Tpe-R) Cas: 59326-56-6 products and find useful product information on Toboc.
Authentic & verified Glycine anhydride Export data for market research & supply chain analysis of Glycine anhydride Export trade, view 102 Export shipments from bill of entry filed at over 64 countries customs.
4124-31-6 Trichloroacetic anhydride testing. Laboratory testing for CAS number 4124-31-6. Trichloroacetic anhydride. This chemical is colourless liquid
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TY - JOUR. T1 - XXXII. - Action of phosphoric anhydride on fatty acids. Part I. AU - Kipping, F. Stanley. PY - 1890. Y1 - 1890. U2 - 10.1039/CT8905700532. DO - 10.1039/CT8905700532. M3 - Literature review. VL - 57. SP - 532. EP - 540. JO - Journal of the Chemical Society, Transactions. JF - Journal of the Chemical Society, Transactions. SN - 0368-1645. ER - ...
Page contains details about poly(iso-butylene-alt-maleic anhydride/succinic amides)-coated dodecanethiol-stabilized gold nanoparticles in TBE buffer . It has composition images, properties, Characterization methods, synthesis, applications and reference articles : nano.nature.com
نسخه قابل چاپ خلاصه مقاله Statistical Process Optimization of poly(bis(2-hydroxyl ethyl) terephthalate-Maleic Anhydride)from PET - گواهی پذیرش مقاله در کنفرانس
4-Thiazoleacetic acid,alpha-[(acetyloxy)imino]-2-amino-,anhydride with diethyl hydrogen phosphate,(Z)-/ACM205307524 can be provided in Alfa Chemistry. We are dedicated to provide our customers the best products and services.
Joosten, Mathew W., Agius, Steven, Hilditch, Tim and Wang, Chun 2017, Effect of residual stress on the matrix fatigue cracking of rapidly cured epoxy/anhydride composites, Composites part A: applied science and manufacturing, vol. 101, pp. 521-528, doi: 10.1016/j.compositesa.2017.07.007. ...
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Dissolution of paracetamol crystallized in the presence of poly(vinyl acetate-co-maleic anhydride), DA Raval, DN Parikh, VM Patel
Buy 3-(4-Chlorophenyl)glutaric Anhydride (CAS 53911-68-5), a product for proteomics research, from Santa Cruz Biotechnology. MF: C11H9ClO3, MW: 224.64
All metallic oxides that react with water to form a base solution are considered basic anhydrides, including lithium, magnesium, sodium and calcium oxides. Only the oxides formed by the alkali metals...
Sigma-Aldrich offers Aldrich-441570, (R)-(+)-2-Acetoxysuccinic anhydride for your research needs. Find product specific information including CAS, MSDS, protocols and references.
Hexahydro-4 methylphthalic anhydride (4 -MHHPA) was examined for its possible prenatal developmental toxicity in a GLP compliant study according to OECD 414. Groups of 26 sperm-positive female Hsd. Han: Wistar rats were treated with the test item by oral administration daily at three dose levels of 80, 240 and 460 mg/kg bw/day respectively from day 5 up to and including day 19 post coitum. A control group of 26 sperm positive females was included and the animals were given the vehicle sunflower oil. During the study, mortality was checked and clinical observations were performed. The body weights and food consumption of the dams were also recorded. The day when sperm was detected in the vaginal smear was regarded as day 0 of gestation. Caesarean section and gross pathology were performed on gestational day 20. The number of implantations, early and late resorptions, live and dead fetuses in each uterine horn and the number of corpora lutea were recorded. Each fetus was weighed and examined for ...
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The glutaconic acids are substances possessing a highly mobile three carbon tautomeric system. They also exhibit geometrical isomerism and, in the case of the symmetrically di-substituted acids, optical isomerism as well. Glutaconic acid has the trans configuration, but readily yields an anhydride which on careful hydration forms the unstable cis-acid (Malachowski, Ber., 1929, 62, (B) 1323). This is explained by the high mobility of the system which results in isomerisation from the trans to the cis form as a preliminary step in anhydride formation. ...
There is provided an underlayer coating forming composition for lithography that is used in lithography process of manufacture of semiconductor device; and an underlayer coating having a high dry etching rate compared with photoresist. Concretely, it is a composition for forming an underlayer without use of crosslinking reaction by an strong acid catalyst, and an underlayer coating forming composition containing a component having an epoxy group (a polymer, a compound) and a component having a phenolic hydroxyl group, a carboxyl group, a protected carboxyl group or an acid anhydride structure (a polymer, a compound).
Characteristics of organic compounds analysis. The methodology of the analysis, development and trends. Determination of physical constants: melting and boiling point, refractivity, optical activity, partition coefficients of extraction, molecular weight, spectral constants. Determination of purity, purification of sample. Elemental analysis. Sample decomposition, detection and determination of C, H, O, N, Cl, Br, I, S, P, F. Automatic methods of elemental analysis. Functional groups identification: classes of dissolution, classification reactions for carbohydrates, alcohols, phenols, aldehydes, ketones, carboxylic acids, acid anhydrides, esters, amides, imides, ethers, epoxides, peroxides, amines, hydroxylamines, nitriles, isocyanides, nitro-, nitroso-, azo-, azoxy-, hydrazo- and diazocompounds, thiols, sulphonic and sulphinic acids and their derivatives, halogen compounds. Methods and procedures for identification of organic compounds. Determination of organic compounds based on their ...
English Translation of naphtaline , Collins French-English ... English Translation of naphtaline , The official Collins French-English Dictionary online. Over 100,000 English translations of French words and phrases. Define mothball. mothball synonyms, mothball pronunciation, mothball translation, English dictionary definition of mothball. ... etc) out of operation but maintain it ... Fujifilm Instax Mini 9 User Manual Have a look at the manual Fujifilm Instax Mini 9 User Manual online for free. Its possible to download the document as PDF or print. UserManuals.tech offer 17 Fujifilm manuals and users guides for free. US3507810A - Catalyst for oxidation of naphthalene to ... US3507810A - Catalyst for oxidation of naphthalene to phthalic acid anhydride - Google Patents. durée : 00:05:44 - Tanguy Pastureau maltraite linfo - par : Tanguy Pastureau - Les sondages de France Inter sont exceptionnels, 6 millions de gens écoutent cette radio tous les jours, 120 millions selon la CGT Radio ...
vacuolar ATP synthase subunit B, putative / V-ATPase B subunit, putative / vacuolar proton pump B subunit, putative / V-ATPase 57 kDa subunit, putative; FUNCTIONS IN: hydrogen ion transporting ATP synthase activity, rotational mechanism, hydrolase activity, acting on acid anhydrides, catalyzing transmembrane movement of substances, proton-transporting ATPase activity, rotational mechanism; INVOLVED IN: proton transport, ATP metabolic process, ATP synthesis coupled proton transport; LOCATED IN: plasma membrane, vacuole, membrane, chloroplast envelope; EXPRESSED IN: 27 plant structures; EXPRESSED DURING: 15 growth stages; CONTAINS InterPro DOMAIN/s: ATPase, F1/V1/A1 complex, alpha/beta subunit, C-terminal (InterPro:IPR000793), ATPase, F1/V1/A1 complex, alpha/beta subunit, N-terminal (InterPro:IPR004100), ATPase, F1/V1/A1 complex, alpha/beta subunit, nucleotide-binding (InterPro:IPR000194), ATPase, V1 complex, subunit B (InterPro:IPR005723); BEST Arabidopsis thaliana protein match is: vacuolar ATP ...
CGS 27830 [meso-1,4-dihydro-5-methoxycarbonyl-2,6-dimethyl-4-(3- nitrophenyl)-3-pyridine carboxylic acid anhydride] is a nonpeptidic, insurmountable, endothelin (ET) receptor antagonist with approximately 10- to 20-fold selectivity for ETA receptors. CGS 27830 exhibits unusual binding properties which depend on the receptor and ligand: standard saturation binding experiments (coincubation of membranes with ligand in the absence or presence of antagonist) suggest that CGS 27830 is a competitive inhibitor of [125I]IRL 1620 binding to ETB receptors in rat cerebellar membranes (i.e., there was a change of apparent Kd with no change of maximum binding), but a noncompetitive inhibitor of [125I]IRL 1620 binding to ETB receptors in rat lung membranes (i.e., significant loss of total binding was observed). Although the antagonist appears to be a noncompetitive inhibitor of [125I]IRL 1620 binding to ETB receptors in rat lung membranes, CGS 27830 appears to be a competitive inhibitor of [125I]ET-1 binding ...
Aldrich-697443; 1-(Phenylsulfonyl)-2-indolylboronic acid MIDA ester 0.96; CAS No.: 1158984-95-2; Synonyms: 1-(Phenylsulfonyl)indole-2-boronic acid; 1-(Phenylsulfonyl)indole-2-boronic acid MIDA ester; Methyliminodiacetic acid anhydride; Linear Formula: C19H17BN2O6S
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Millions of active and retired military and civilian personnel contractors and other parties could face financial hardships if the Defense Finance and Accounting Service (DFAS) does not fix its Year 2000 computer problems according to a report issued last week by the General Accounting Office. In a
Conjugates of testosterone-3-carboxymethyloxime (T-3-CMO), testosterone-17-hemisuccinate (T-17-HS), 17 beta-estradiol-6-carboxymethyloxime (E-6-CMO), or 17 beta-estradiol-17-hemisuccinate (E-17-HS) and bovine serum albumin (BSA) with varying steroid:protein ratios were prepared using the mixed anhydride method. Dialysis followed by molecular filtration yielded monomer steroid-BSA conjugates with a molecular weight of 70,000 dalton, and polymer conjugates with molecular weights of 140,000 dalton and higher. When conjugates were prepared with increasing initial steroid:BSA molar ratios the ratio of the obtained conjugates increased, in parallel with a decrease in the relative amount of monomers and an increase in the mean molecular size of polymers. The molecular properties of these conjugates were studied further by polyacrylamide gel electrophoresis (PAGE) in native and denaturing conditions. In native PAGE the monomer fractions showed one main band with a mobility slightly lower than BSA and a faint
alternative to amitriptyline for ibs Pfleiderâ  s revised total debt of $1,098.87 was less than the $1,533 the Treasury had already collected from him on behalf of DFAS. After accounting for other, smaller underpayments to Pfleider, as well as interest and penalties, DFAS said his final total debt came to $815.50 â  or only about 25 percent of what it had claimed when it started sending bills to him. DFAS deducted that from the $1,533 it already had collected and in mid-April, a month after Reuters inquired about his case, paid him the balance of $717.50 ...
I want to make a quick correction to the last video where we introduced the carboxylic acid videos, and then we can actually compare them in terms of
For REACH substances, inclusion in the list means that an informal hazard assessment for PBT/vPvB properties either is under development or has been completed since the start of the implementation of the SVHC Roadmap in February 2013. For each substance, the table shows the assessing or evaluating Member State (submitter), the outcome and the suggested follow-up from the assessment, and the date of the latest update to the list entry. Other process details and hazard assessment outcome documents are also available and can be accessed through the Details icon. One possible outcome of such an assessment is that a substance is considered not to have PBT/vPvB properties. If the outcome is that the substance is considered to have PBT/vPvB properties, confirmation through the formal risk management and decision-making processes under REACH/BPR is needed before any regulatory action can be taken due to these properties. The intentions of authorities to submit a dossier to the formal REACH and CLP ...
This list contains biological and chemical agents, in accordance with Art. 7 and points 2 and 3 of the Annex to Directive 94/33/EC, to which young persons (under 18 years of age) may not be exposed at the workplace. The database represents a non-exhaustive list of such substances based on: 1) agents of risk groups 3 and 4 under Directive 2000/54/EC; 2) Table 3 of Annex VI to the CLP Regulation; 3) and Annex I of Directive 2004/37/EC.. ...
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database ...
Succinic anhydride can be expected to have a low potential for bioaccumulation (due to low log Pow). Information regarding the toxicokinetics and percutaneous absorption of cyclic anhydrides is available in the published literature. Toxicokinetics data on hexahydrophthalic anhydride and phthalic anhydride indicate that cyclic anhydrides are readily hydrolysed to the corresponding dicarboxylic acid, which is mainly excreted in the urine and to a lesser extent in expired air after exposure via the inhalation route. Cyclic anhydrides share structural and physicochemical properties such that following inhalation exposure. The hydrolysis product of succinic anhydride is succinic acid, an endogenous substance and food ingredient that is expected to be effectively excreted in urine. A separate toxicokinetics study on succinic anhydride is not proposed and cannot be justified based upon animal welfare considerations. Percutaneous absorption of cyclic anhydrides was investigated using hexahydrophthalic ...
Acetic anhydride is an esterification agent for use in prepn. of modified food starch and for acetylation of monoglycerides Acetic anhydride is a versatile reagent for acetylations, the introduction of acetyl groups to organic substrates. In these conversions, acetic anhydride is viewed as a source of CH3CO+. Alcohols and amines are readily acetylated. For example, the reaction of acetic anhydride with ethanol yields ethyl acetate: (CH3CO)2O + CH3CH2OH → CH3CO2CH2CH3 + CH3COOH. Acetic anhydride is an irritant and flammable. Because of its reactivity toward water, alcohol foam or carbon dioxide are preferred for fire suppression. The vapour of acetic anhydride is harmful. Acetic anhydride is the chemical compound with the formula (CH3CO)2O. Commonly abbreviated Ac2O, it is one of the simplest acid anhydrides and is a widely used reagent in organic synthesis. It is a colorless liquid that smells strongly of acetic acid, which is formed by its reaction with the moisture in the air. As indicated ...
The single dose oral toxicity of succinic anhydride in Sprague-Dawley rats was reported as 1794.9 mg/kg bw for males and females. The acute dermal median lethal dose for succinic anhydride was found to exceed the limit dose level in rats, ,2000 mg/kg bw. Clinical signs included reduced appetite and activity, increasing weakness, collapse and death inalbino rabbits following acute dermal administration of maleic anhydride. The LD50 is between 1600 and 2600 mg/kg/day. Macroscopic evaluation showed enlarged gall bladder, discoloration of spleen and kidneys, and gastrointestinal inflammation. Similar results would be expected with succinic anhydride Acute inhalation testing is not required. The results of the granulometry indicate the L10 value for particle size was 377 µm and the L50 was greater than 1100 µm. On the basis of these results only a very small part of the particles in the batch of succinic anhydride may be smaller than 100 µm and may be respirable. The lager part of the particles ...
TY - JOUR. T1 - Formation of citraconic anhydride via condensation of dialkyl succinates and formaldehyde. AU - Shekhawat,Dushyant. AU - Nagarajan,Kirthivasan. AU - Jackson,James E.. AU - Miller,Dennis J.. PY - 2002. Y1 - 2002. N2 - The formation of citraconic anhydride (CAN) from the condensation of succinic acid and its derivatives with formaldehyde over oxide catalysts is described. Alumina and aluminum phosphate are active catalysts that give selectivity to citraconic anhydride as high as 75% in an integral fixed bed reactor. Weakly acidic sites on the catalyst surface, particularly Lewis acid sites, are responsible for activating the desired reaction pathway. Strongly acidic sites lead to cracking and coking, while basic sites facilitate the Cannizzaro reaction of formaldehyde to carbon dioxide and methanol. Catalyst deactivation via coking occurs over the course of reaction, but activity is easily restored by regeneration in air at elevated temperatures. The reaction system under ...
Define acetic anhydride. acetic anhydride synonyms, acetic anhydride pronunciation, acetic anhydride translation, English dictionary definition of acetic anhydride. n a colourless pungent liquid used in the manufacture of cellulose and vinyl acetates for synthetic fabrics. Formula: 2O n. a colorless, pungent liquid,...
Acetic anhydride, is a colorless liquid, primarily used in the manufacturing of cellulose acetate. Cellulose acetate is used in production of several products, such as cigarette filters, textile fibers and plastic goods. In addition, acetic anhydride is used for production or manufacturing of resins & polymers, artificial sweeteners, TAED, explosives, agrochemicals, coating materials and others. Acetic anhydride is used to manufacture tetraacetylethylenediamine (TAED), which is utilized as a bleach activator in laundry and cleaning industry. Similarly, acetic anhydride, in addition to its several other applications, is used often in the form of derivatives or sources, amongst which cellulose acetate is the most widely used derivative.. Cigarette filters, occupy the largest share in volume, since their tar and nicotine removal rate goes up to 50%, higher than other compounds such as phenols. Thus, cellulose acetate contributes to more than half of the world acetic anhydride market. The demand for ...
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TY - JOUR. T1 - Possibilities of the application of polyisobutenyl succinic anhydride derivatives of various molecular structures. AU - Kocsis, Z.. AU - Baladincz, J.. AU - Bartha, L.. AU - Hancsók, J.. PY - 2001/12/1. Y1 - 2001/12/1. N2 - Detergent-dispersant (DD) effect is one of the most important properties of lubricants and fuels. To ensure these properties various types of additives are used in increasing amount in the performance additive packages. Among them ashless types and mostly polyalkenyl succinic anhydride derivatives are applied in high volumes. In this paper the main advantages of the ashless additives are presented showing the dependence of their properties on the molecule structure (monosuccinimides, bissuccinimides, mixtures thereof and polysuccinimide). Additionally, the interactions with other additives are shown which can determine the main tribological properties of the lubricants.. AB - Detergent-dispersant (DD) effect is one of the most important properties of ...
TY - JOUR. T1 - Reversible acylation and inhibition of aggregation of platelets by substituted maleic anhydrides. AU - Walder, J. A.. AU - Hyman, B. T.. AU - Heller, M. J.. AU - Shishido, R. Y.. AU - Klotz, I. M.. PY - 1977/12/1. Y1 - 1977/12/1. N2 - The antiprostaglandin action of aspirin due to the acetylation of the enzyme prostaglandin synthetase is manifested by inhibition of the so-called release reaction and consequent abolition of secondary-phase aggregation. The maleic anhydrides, a series of reversible acylating agents, have now been shown to produce the aspirin-type defect in platelet aggregation. The antiplatelet effect of aspirin is irreversible. With 2,3-dimethylmaleic anhydride, however, the antiplatelet effect disappeared in approximately 80 min at 25°. Hence the persistence of the lesion when caused by aspirin results from the stability of the acetyl linkage formed in its reaction with prostaglandin synthetase. This suggests that the modification occurs at either a lysine or an ...
TY - JOUR. T1 - Neurogenic goblet cell secretion and bronchoconstriction in guinea pigs sensitised to trimellitic anhydride. AU - Hayes, James P.. AU - Kuo, Han Pin. AU - Rohde, Juliette A.L.. AU - Newman Taylor, Anthony J.. AU - Barnes, Peter J.. AU - Fan Chung, K.. AU - Rogers, Duncan F.. PY - 1995/1/13. Y1 - 1995/1/13. N2 - Trimellitic anhydride is a cause of occupational asthma in humans. We have previously found that tracheal instillation of trimellitic anhydride conjugated to guinea pig serum albumin induces acute bronchoconstriction and airway plasma exudation in sensitised animals, responses mediated primarily via histamine release. In the present study, neural mechanisms mediating bronchoconstriction and goblet cell secretion were determined in trimellitic anhydride-sensitised guinea pigs using the ganglionic blocker hexamethonium to eliminate efferent reflex mechanisms, pretreatment with capsaicin to eliminate afferent mechanisms, or cimetidine and mepyramine to eliminate ...
Maleic anhydride is the organic compound which is the maleic acids acid anhydride. It is produced in large quantities for the coatings and polymers applications.
As indicated by its organic chemistry, Acetic anhydride is mainly used for acetylations leading to commercially significant materials. Its largest application is for the conversion of cellulose to cellulose acetate, which is a component of photographic film and other coated materials, and is used in the manufacture of cigarette filters. Similarly it is used in the production of aspirin (acetylsalicylic acid), which is prepared by the acetylation of salicylic acid.[19] It is also used as a wood preservative via autoclave impregnation to make a longer-lasting timber. In starch industry, acetic anhydride is a common acetylation compound, used for the production of modified starches (E1414, E1420, E1422) Because of its use for the synthesis of heroin by the diacetylation of morphine, acetic anhydride is listed as a U.S. DEA List II precursor, and restricted in many other countries.[20]. ...
Im not sure, but I think that its possible that I prepared acetic anhydride by accident today. I mixed 164g CH3COONa (contaminated with a small amount of NaHCO3, around 1-2g) with 75g 94% H2SO4. I then poured that into a flask; began heating it, and condensing the vapors (typical distillation). I noticed a very strange, sickly-sweet odor; very difficult to describe. I got a whiff of a very small amount of it, causing me to choke for a few moments. The condensed liquid (which I got 22mL of, if I remember correctly) was still liquid, showing no signs of imminent freezing, at -10C. Now, if that had been acetic acid, it would have frozen at a far higher temperature than that... acetic anhydride, on the other hand, would not freeze until the temperature was FAR lower. Im postulating that the following reactions were occuring, forming at least a fair-sized quantity of acetic anhydride (there is probably a significant amount of acetic acid remaining). Keep in mind that there was a slight ...
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Maleic Anhydride (Maleic Anhydride) is an intermediate chemical, produced from oxidation of benzene using a special catalyst.. Maleic Anhydride is a versatile chemical that is needed in almost all fields of the chemical industry. The use of Maleic Anhydride varies due to the structure of the di carboxylic acid group, double bond reactivity between alpha and beta positions. This chemical structure and the high reactivity of the Maleic Anhydride derivative make it possible to make various types of resins and also organic reagents for various chemical transformations.. ...
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Random polymerization by radical mechanisms is probably the most common, and takes place in head to tail fashion, predominately about the alkene double bonds, to make the sp3 bonded carbons. Try visualizing the styrene polymer, first and then see how one maleic anhydride can disrupt that regular polymer coil ...
91722-16-6 - Soybean oil, mixed esters with maleic anhydride and pentaerythritol, reaction products with dicyclopentadiene - Searchable synonyms, formulas, resource links, and other chemical information.
Research Report on Asia-Pacific Maleic Anhydride(MAH) Market Report 2017. The Report includes market price, demand, trends, size, Share, Growth, Forecast, Analysis & Overview.
1. Bernstein, D.I., Patterson, R. et Zeiss, C.R., «Clinical and immunologic evaluation of trimellitic anhydride and phthalic anhydride exposed workers using a questionnaire with comparative analysis of enzyme-linked immunosorbent and radioimmunoassay studies.» Journal of Allergy and Clinical Immunology. Vol. 69, no. 3, p. 311-318. (1982). [AP-022699 ...
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Global Styrene-Maleic Anhydride Copolymer Market is a professional and in-depth study on the current state of the industry. The report provides a basic overview of the Styrene-Maleic Anhydride Copolymer market including definitions, classifications, applications and industry chain structure. This report also states import/export consumption, supply and demand figures, cost, price, revenue and gross margins, and the global market size (volume and value).. Access complete report at: https://www.themarketreports.com/report/2017-global-styrene-maleic-anhydride-copolymer-industry-depth-research-report. Key companies profiled in this report are Polyscope Polymers, Total Cray Valley (Tcv), Ineos, Sinopec, Baoding Lucky Chemical, Yinxin Chemical, Kaixin Fine Chemical more in terms of basic information, product categories, Sales (Volume), Revenue (Million USD), Price (USD/Unit) and Gross Margin (%) (2012-2017).. Global Styrene-Maleic Anhydride Copolymer Market Report covers Alternate Styrene-Maleic ...
polyoxyethylene (2-methyl-2-propenyl) methyl diether-maleic anhydride copolymer: comb-shaped copolymer of PEG derivative and maleic anhydride; mol wt 100,000; structure of comb-shaped copolymers given in first source
Mass spectrometry of heterocyclic compounds. XVIII. New secondary metabolites of Aspergillus wentii Wehmer. The positive and negative ion mass spectra produced by electron impact. Selva, A.; Traldi, P.; Camarda, L.; Nasini, G. Biomedical Mass Spectrometry (1980), 7(4), 148-52.. ...
To date, no credible buyers have been identified and no offers for acquiring these facilities were made. Therefore, Celanese said Monday that it will begin discussions concerning the possible closure of both the acetic anhydride facility in Roussillon and the VAM production unit in Tarragona. This action is initiated to safeguard the competitiveness of the Celanese acetyl business. The need for these contemplated projects emerged from an assessment of Celanese s overall corporate strategy, which included an assessment of the company s global manufacturing facilities. Specifically, in support of the company s acetyl portfolio, the manufacturing footprint strategy favors integrated production sites that provide critical economies of scale. Celanese subsidiaries that operate these facilities expect to soon begin the consultation process with local employee representatives to mitigate the social impact of the closures to the best possible extent.. ...
We,China Suppliers & China Manufacturers, provide our Products catalog2: China Acetic acid, China Acetic anhydride, China Acetone
The reaction between acetic anhydride and water is written as follows: (CH3CO)2O + H2O --| 2CH3COOH. This reaction produces two molecules of etanoic acid, a compound that appears as a colorless...
290924807 - EP 1124893 B1 2004-12-22 - POLYISOCYANATE POLYADDITION PRODUCTS - [origin: DE19928676A1] Polyisocyanate poly-addition products contains: (i) hydrophobic compounds; (ii) cyclic organic compounds; (iii) certain metal salts; (iv) acid anhydrides; (v) cyclic sulfonic acid esters or sulfones; (vi) lactones, lactams or cyclic esters; and/or (vii) alpha , beta -unsaturated carboxylic acids, acid derivatives, ketones and/or aldehydes. Polyisocyanate poly-addition products (I) containing hydrophobic compounds and other compound(s) selected from: (i) cyclic organic compounds with mol. wts. of 200-3000; (ii) salts of Sub-Group I, II and/or VIII metals; (iii) organic and/or inorganic acid anhydrides; (iv) cyclic sulfonic acid esters or sulfones; (v) lactones, lactams or cyclic esters; and/or (vi) alpha , beta -unsaturated carboxylic acids and their derivatives and alpha , beta -unsaturated ketones and/or aldehydes. Independent claims are also included for: (a) a process for the production of (I)
Gantrez™ AN polymers are synthetic, alternating copolymers of methyl vinyl ether (MVE) and maleic anhydride available in a range of molecular weights. Although the anhydride polymers (AN grades) are not directly useable in oral care products, they are used as base polymer for making polymer salts used as bioadhesives in denture adhesive applications. When Gantrez™ AN polymers anhydrides are dispersed in water, the anhydride side-chain hydrolyzes to produce free diacid solutions that are directly useable in oral care products. Gantrez™ polymer diacids are available as Gantrez S polymers. Applications:. ...
It can be seen from the phthalic anhydride price trend chart that the phthalic anhydride market stopped falling and recovered in October, and the phthalic anhydride price rose by 2.94%. The phthalic anhydride market rose, which was good for the o-benzene market, and the downstream demand for o-phthalic anhydride rose, and the driving force for the price rise of o-phthalic anhydride increased.. Future forecast:. According to Bai Jiaxin, an o-xylene data analyst from business agency, in October, the prices of raw materials for o-benzene rose slightly, while the prices of phthalic anhydride and plasticizer in the downstream sector rose, and the market of downstream industrial chain of o-benzene increased, and the momentum of o-benzenes rise was sufficient, which was beneficial to the market of o-benzene. Generally speaking, the market of o-benzene has sufficient momentum to rise, the market of o-benzene is strong, and the price is strong and stable temporarily.. ...
Water insoluble polycaprolactone-epoxide adducts are produced comprising the reaction product of a polycaprolactone polyol, a diepoxide and an anhydride of a polycarboxylic acid. The polycaprolactone polyol reacted with the diepoxide and the anhydride of the polycarboxylic acid has at least two hydroxyl groups in the molecule, a hydroxyl number of from about 15 to about 600 and an average molecular weight of from about 290 to about 6,000. The carboxylic acid anhydride has at least one intramolecular carboxylic anhydride group. These water insoluble polycaprolactone-epoxide adducts on reaction with an inorganic or organic base produce water soluble, carboxyl modifier polycarprolactone-epoxide oligomer addition reaction products which are eminently suitable for the production of aqueous coatings compositions. Exceptionally good coatings compositions are obtained when a crosslinker is present in the coating composition.
An epoxy material suitable for no-flow underfilling processes with high glass transition temperature can be obtained by curing a solvent free formulation containing an epoxy resin, an organic carboxylic acid anhydride hardener, a curing accelerator, a fluxing agent, a viscosity controlling agent, a coupling agent, and a surfactant.
Grade: Biotech Appearance Fine, white homogeneous powder Moisture content ≤10% Gel Strength 1.5% ≥1,120 g/cm2 Gelling Point 34.5 - 37.5°C Electroendosmosis-Mr 0.09-0.13 Sulfate ≤0.15% DNase , RNase and protease None detected ...
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 ...
Poly P is a linear polymer that consists of a variable number of phosphate residues (from three to more than a thousand) that are linked by energy-rich phosphoanhydride bonds. It occurs ubiquitously in all living cells and regulates many molecular and biological processes. Nevertheless, poly P is scarcely studied and little is known about poly P metabolism and its exact molecular functions; especially in eukaryotes. In our group we have developed methods to quantify poly P, to stain and localize poly P and to screen for poly P binding proteins. We are using these tools to investigate poly P metabolism and functions in fungi, plants and algae. However, at the moment our main efforts are devoted to the study of poly P metabolism in the yeast Saccharomyces cerevisiae and of poly P in fungal cell walls. ...
High-polymeric inorganic polyphosphates were found in living organisms by L. Liberman in 1890. These compounds are linear polymers containing a few to several hundred residues of orthophosphate linked by energy-rich phosphoanhydride bonds. Previously, it was considered either as molecular fossil or as only a phosphorus and energy source providing the survival of microorganisms under extreme conditions. These compounds are now known to also have regulatory roles, and to occur in representatives of all kingdoms of living organisms, participating in metabolic correction and control on both genetic and enzymatic levels. Polyphosphate is directly involved in the switching-over of the genetic program characteristic of the exponential growth stage of bacteria to the program of cell survival under stationary conditions, a life in the slow line. They participate in many regulatory mechanisms occurring in bacteria: ...
The present invention relates to processes for controlling the formation and deposition of scale and sludge and in particular calcium phosphate which would otherwise occur in aqueous mediums containing sludge and the ions capable of forming scale. The invention, more particularly, relates to the control, reduction and/or prevention of scale and sludge deposits in cooling water, scrubber and steam generating systems, evaporators, economizers, and the like by the introduction of a copolymer comprising sulfonated styrene and maleic anhydride moieties to the water used therein. The copolymers discovered to be particularly effective for the purpose are those having a mole ratio of sulfonated styrene moieties to moieties derived from maleic anhydride of from about 2:1 to about 4:1 and preferably 2:1 to 3:1 with certain type deposits.
A photoimageable composition, useful as a photoresist for forming a printed circuit board, is both alkaline aqueous developable but, subsequent to exposure and development, is processable in highly alkaline environments, such as additive plating baths and ammoniacal etchants. The photoimageable composition is tack-free and is resistance to polymerization inhibition by oxygen, and is therefore particularly suitable for contact printing. The photoimageable composition comprises A) between about 25 and about 75 wt % of a binder polymer, B) between about 20 and about 60 wt % of a photopolymerizeable material which is a multifunctional photopolymerizeable monomer or short chain oligomer, and C) between about 2 and about 20 wt % of a photoimageable chemical system, the weight percentages being based on the total weight of components A)-C). The improvement is the use in the photoimageable composition of a binder polymer A) which is a styrene/maleic anhydride copolymer in which the incorporated maleic anhydride
Video articles in JoVE about acetic anhydrides include Consensus Brain-derived Protein, Extraction Protocol for the Study of Human and Murine Brain Proteome Using Both 2D-DIGE and Mini 2DE Immunoblotting, Customization of Aspergillus niger Morphology Through Addition of Talc Micro Particles, Chick Heart Invasion Assay for Testing the Invasiveness of Cancer Cells and the Activity of Potentially Anti-invasive Compounds, The Use of the Ex Vivo Chandler Loop Apparatus to Assess the Biocompatibility of Modified Polymeric Blood Conduits, Foraging Path-length Protocol for Drosophila melanogaster Larvae, Recombinant Protein Expression, Crystallization, and Biophysical Studies of a Bacillus-conserved Nucleotide Pyrophosphorylase, BcMazG, Analysis of LINE-1 Retrotransposition at the Single Nucleus Level, Evaluating In Vitro DNA Damage Using Comet Assay, Non-Invasive Model of Neuropathogenic Escherichia coli Infection in the Neonatal Rat, Measurement of Basal and Forskolin-stimulated Lipolysis
A multi-ply, heat-shrinkable film has a surface layer for contact with a cooked or processed meat product which is formed of an ethylene-ethyl acrylate-maleic anhydride copolymer or a mixture of the ethylene-ethyl acrylate-maleic anhydride copolymer and a polyolefin, with the content of ethyl acrylate component in the surface layer being 2 to 20% by weight and the content of maleic anhydride component being 1 to 5% by weight. A cooked or processed meat product may be packaged with the multi-ply, heat-shrinkable film and formed according to zero-loss cooking method.
Oxides of more electropositive elements (particularly metals) tend to be basic, and they are called basic anhydrides. Upon adding water, they may form basic hydroxides. For example, sodium oxide is basic; when hydrated, it forms sodium hydroxide.. Conversely, oxides of more electronegative elements tend to be acidic. They are called acid anhydrides. Upon adding water, they form oxoacids. For example, dichlorine heptoxide is an acidic oxide; perchloric acid is a hydrated form.. In some cases, an oxide can behave as an acid or a base, under different conditions. They are called amphoteric oxides. An example is aluminum oxide. Other oxides do not behave as either acid or base.. The oxide anion (O2−) is the conjugate base of the hydroxide ion (OH−) and is encountered in an ionic solid such as calcium oxide. The O2− anion is unstable in aqueous solution-its affinity for H+ is so great (pKb ~ -22) that it extracts a proton from a solvent H2O molecule:. ...
α-Methylacetylfentanyl (or alphamethylacetylfentanyl) is an opioid analgesic that is an analog of fentanyl. It is a Schedule I controlled substance in the United States, with a DEA ACSCN of 9815. α-Methylacetylfentanyl was sold briefly on the black market in the early 1980s, before the introduction of the Federal Analog Act which for the first time attempted to control entire families of drugs based on their structural similarity rather than scheduling each drug individually as they appeared. α-Methylacetylfentanyl is made with the same synthetic route as α-methylfentanyl, but by substituting the relatively common acetic anhydride for the more difficult to obtain chemical propionic anhydride in the synthesis. α-Methylacetylfentanyl has similar effects to fentanyl.[medical citation needed] Side effects of fentanyl analogs are similar to those of fentanyl itself, which include itching, nausea and potentially serious respiratory depression, which can be life-threatening. Fentanyl analogs have ...
Name: Drug, bio-affecting and body treating compositions > Designated organic active ingredient containing (doai) > Radical -xh acid, or anhydride, acid halide or salt thereof (x is chalcogen) doai > Carboxylic acid, percarboxylic acid, or salt thereof (e.g., peracetic acid, etc.) > Cyclic carboxylic acid containing three to five carbons or cyclic percarboxylic acid containing three to five carbons or salt ...
All information about the latest scientific publications of the Clínica Universidad de Navarra. Bioadhesive properties and biodistribution of cyclodextrin-poly(anhydride) nanoparticles
A general strategy for visible-light-enabled site-selective trifluoromethylative pyridylation of unactivated alkenes has been developed using pyridines and triflic anhydride (Tf2O). Intriguingly, the N-triflylpyridinium salts, generated in situ from pyridines and Tf2O, serve as effective modular bifunctional reagents to install both CF3 and pyridyl groups to various olefins while controlling C4-selectivity in radical addition to the pyridine core. This synthetic route exhibited broad substrate scope under metal-free and mild photocatalytic conditions, granting efficient access to valuable C4-alkylated pyridines and quinolines without requiring prefunctionalization of the reaction site ...
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Pakistan imported Acids; cyclanic, cyclenic or cycloterpenic polycarboxylic acids, their anhydrides, halides, peroxides, peroxyacids and derivatives from China ($346.11K , 200,000 Kg), Germany ($295.14K , 146,981 Kg), Hong Kong, China ($55.86K , 38,740 Kg), Other Asia, nes ($35.39K , 20,790 Kg), United States ($22.66K , 5,013 Kg ...
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