0013] This invention relates to creating a new class of surface-active agents (amphiphilic molecules) from naturally occurring polysaccharides. The starting materials used in this invention are either partially water-soluble or completely insoluble polysaccharides. They were hydrophilically modified to yield effective wetting agents or emulsifiers. See examples 1-7 for methods of hydrophilically modifying water insoluble polysaccharide. See example 1 and Table 1 for surface tension results. In one of the embodiments, the hydrophilic modification involves covalent functionalization of the polygalacturonic acid using naturally occurring or synthetic molecules that may include but are not restricted to amino acids, peptides, and lipids containing sulfonate groups, and/or polyethylene glycol (PEG) or polypropylene glycol (PPG) homopolymers and copolymers. In another embodiment the said modification process can be carried out with conventional chemical methods using heat supplied using conventional ...
The effects of Pluronic F68, a nonionic surface-active agent, on blood viscosity and platelet adhesiveness during extracorporeal circulation were investigated. Blood viscosity was significantly decreased. Platelet adhesiveness decreased markedly in six patients within ten minutes after intravenous injection. Pluronic F68 has many properties and actions which make it a useful additive to perfusion systems. Its potential in the treatment of diseases in which high viscosity or increased platelet adhesiveness are present deserves investigation.. ...
Contents of the 15 Chapter for This Anionic Surfactants Market Study:-. Chapter 1: to describe Global Anionic Surfactants Market Introduction, product scope, market overview, market opportunities, market risk, market driving force;. Chapter 2: to analyze the top manufacturers of Global Anionic Surfactants Market, with sales, revenue, and price of Global Anionic Surfactants Market, in 2016 and 2017;. Chapter 3: to display the competitive situation among the top manufacturers, with sales, revenue and market share in 2016 and 2017;. Chapter 4: to show the Global Anionic Surfactants market by regions, with sales, revenue and market share of Global Anionic Surfactants Market, for each region, from 2012 to 2017;. Chapter 5, 6, 7, 8 and 9: to analyze the key regions, with sales, revenue and market share by key countries in these regions;. Chapter 10 and 11: to show the market by type and application, with sales market share and growth rate by type, application, Methodology, Analyst Introduction, Data ...
The invention provides compositions intended for the treatment of fibrous materials. These compositions contain at least one cationic polymer, at least one anionic polymer, at least one alkali metal salt and at least one non-ionic surface-active agent or surface-active agent which contains one or more carboxyl or carboxylate groups in addition to non-ionic groups.
... , This detergent is especially suitable for greasy and combination skins. It dissolves and eliminates the exceeding skin sebum, horny scales, dust traces and impurities without attacking the skins natural defences. It has a purifying and cleansing action. It does not contain surface-active agents. Its cleansing action does not impoverish the skin hydrolipidic layer not to stimulate the sebaceous secretion. This detergent is especially suitable for greasy and combination skins. It dissolves and eliminates the exceeding skin sebum, horny scales, dust traces and impurities without attacking the skins natural defences. It has a purifying and cleansing action. It does not contain surface-active agents. Its cleansing action does not impoverish the skin hydrolipidic layer not to stimulate the sebaceous secretion.
Font - Ribera, Laia ; Kogevinas, Manolis ; Zock, Jan - Paul ; Gomez, Federico P. ; Barreiro, Esther ; Nieuwenhuijsen, Mark J. ; Fernandez, Pilar ; Lourencetti, Carolina ; Perez - Olabarria, Maitane ; Bustamante, Mariona ; Marcos, Ricard ; Grimalt, Joan O. ; Villanueva, Cristina M ...
Nonionic surfactants are surface active agents which do not dissociate into ions in aqueous solutions, unlike anionic surfactants which have a negative charge and cationic surfactants which have a positive charge in aqueous solution. Nonionic surfactants are more widely used as detergents than ionic surfactants because anionic surfactants are insoluble in many hard water and cationic surfactants are considered to be poor cleaners. In addition to detergency, nonionic surfactants show excellent solvency, low foam properties and chemical stability. It is thought that nonionic surfactants are mild on the skin even at high loadings and long-term exposure. The hydrophilic group of nonionic surfactants is a polymerized alkene oxide (water soluble polyether with 10 to 100 units length typically). They are prepared by polymerization of ethylene oxide, propylene oxide, and butylene oxide in the same molecule. Depending on the ratio and order of oxide addition, together with the number of carbon atoms ...
Studies on a model ink suspension have shown that the effect of non-ionic dispersion agents on ink agglomeration using fatty acid chemistry as collector was highly temperature-dependent. The non-ionic surfactant reduced the agglomeration efficiency at low temperatures (below the cloud point of the surfactant) but this negative effect was reduced at increasing temperatures. At temperatures above the cloud point the non-ionic surfactant improved the agglomeration. The non-ionic surfactant adsorbs to both the ink and precipitated soap particles, which at low temperatures resulted in an increased colloidal stability of the particles but at higher temperatures led to a destabilisation of the particles due to the increased hydrophobicity of the surfactant. The surfactants clearly affected the precipitation of fatty acid anions to calcium soaps and at very high surfactant concentrations the formation of calcium soap particles was drastically reduced. The most favourable conditions seemed to be ...
The cloud points (CP) of 1 g/dl solutions of polyethylene oxide-polypropylene oxide (PEO-PPO) based triblock copolymers (Pluronics® P84, L64, L44 and Reverse Pluronics® 10R5, 25R4, 17R4) were measured as a function of their molecular weight and added ionic surfactant. For identical PEO/PPO ratios, copolymers with lower molecular weight show a larger increase in the cloud point in the presence of surfactants than polymers with higher molecular weight. The opposite trend has been observed for reverse Pluronics. The cloud points of polymers with different PEO/PPO ratios have also been reported. An increase in the size of the middle PEO block in reverse Pluronics has a more significant effect on cloud points than molecular weight increment. Ionic surfactants produced marked increases in the cloud points of copolymer solutions. The effect was much larger for surfactants with higher hydrophobicity. Cationic surfactants with different chain lengths were used to examine the surfactant-polymer ...
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A Niosome is a non-ionic surfactant-based Vesicle (biology and chemistry). Niosomes are formed mostly by non-ionic surfactant and cholesterol incorporation as an excipient. Other excipients can also be used. Niosomes have more penetrating capability than the previous preparations of emulsions. They are structurally similar to liposomes in having a bilayer, however, the materials used to prepare niosomes make them more stable. Niosomes are lamellar structures that are microscopic in size. They constitute of non-ionic surfactant of the alkyl or dialkyl polyglycerol ether class and cholesterol with subsequent hydration in aqueous media. The surfactant molecules tend to orient themselves in such a way that the hydrophilic ends of the non-ionic surfactant point outwards, while the hydrophobic ends face each other to form the bilayer. The figure in this article on Niosomes gives a better idea of the lamellar orientation of the surfactant molecules. Niosomes are osmotically active, chemically stable ...
The susceptibility of ethoxylated non-ionic surfactants to oxidation on exposure to air was investigated. Surfactants have a complex chemical composition and are widely used in a variety of applications for to their amphiphilic properties. Ethoxylated non-ionic surfactants are regarded by the producers to be stable at normal handling. However, ethoxylated surfactants are polyethers and as such susceptible to oxidation on exposure to air, which is theoretically discussed in literature. Hand eczema is a common occupational disease of which mom than half of the cases is considered to be caused by work with surfactants and water. Surfactants are known to cause skin irritation, but cases of allergic contact dermatitis have also been reported.. Some ethoxylated surfactants were handled at room temperature in a manner that imitated ordinary handling at work. All samples autoxidized and the structures of some of the components formed were identified with liquid chromatography (HPLC) and gas ...
The self-assembly of complex molecules containing water-attracting (hydrophilic) and water-repelling (hydrophobic) segments in water is important across many scientific disciplines. Surfactants are surface-active agents widely used in the chemical industry to control the interface between liquids or a solid and a liquid. Surfactants aggregate to give either spherical or cylindrical molecular structures with collapsed hydrophobic cores and hydrophilic outer surfaces when exposed to water. Similarly, proteins fold in three-dimensional structures with hydrophobic cores in the interior and hydrophilic groups in the exterior. In contrast, the molecular peptoid structures, a nature-inspired synthetic material, synthesized in this research at Lawrence Berkeley National Laboratory consist of hollow rings stacked to produce a tube. The key to verifying the formation of nanotubes is cryo-electron microscopy which imaged 50 of the nanotubes showing the diameter of each tube is relatively uniform along its ...
NEW YORK, Feb. 2, 2011 /PRNewswire/ -- Reportlinker.com announces that a new market research report is available in its catalogue: Global Surface Active Agents...
Cloud point is an important property to consider when evaluating surfactants for your formulation.. Cloud point is defined as the temperature above which a surfactant rich phase separates from an aqueous solution. This separation occurs when a nonionic surfactant, for instance, becomes insoluble due to increased heat, resulting in a cloudy or hazy dispersion in the solution. As heat and instability increases, the solution may undergo total phase separation.. It is generally understood that nonionic surfactants will perform most effectively when used at temperatures at or near their cloud point.. With this in mind, it is possible to manipulate the cloud point of a solution through the presence of other materials. More specifically, certain components can depress or increase the solutions cloud point. For example, the addition of a coupler or hydrotrope can increase the cloud point of a solution, whereas builders or other salts (electrolytes) will depress the cloud point temperature. In fact, ...
Stable microbicidal disinfectant compositions comprising a complex of a halogen, a nonionic surface-active agent, and an -onium salt of an alkyl amine characterized by a negative reaction to standard tests for free halogen, no loss of halogen when boiled in an aqueous solution, and having microbicidal activity.
In: XXII International Conference on Raman Spectroscopy. American Institute of Physics, Melville, USA, pp. 839-840. ISBN 9780735408180 ISSN 0094-243X (doi:10.1063/1.3482842) Vine, G.J., Chowdhry, B.Z. and Mitchell, J.C. (2005) Antimicrobial properties of surface-active agents by flow calorimetry. Journal of Pharmacy and Pharmacology, 57 (S1). S107-S107. ISSN 0022-3573 (Print), 2042-7158 (Online) (doi:10.1211/002235705778248406) Seidel, J., Pinkrah, V.T., Mitchell, J.C., Chowdhry, B.Z. and Snowden, M.J. (2004) Isothermal titration calorimetric studies of the acid-base properties of poly (N-isopropylacrylamide-co-4-vinylpyridine) cationic polyelectrolyte colloidal microgels. Thermochimica Acta, 414 (1). pp. 47-52. ISSN 0040-6031 (doi:10.1016/j.tca.2003.11.012) Pinkrah, V.T., Snowden, M.J., Mitchell, J.C., Seidel, J., Chowdhry, B.Z. and Fern, G.R. (2003) Physicochemical properties of poly(N-isopropylacrylamide-co-4-vinylpyridine) cationic polyelectrolyte colloidal microgels. Langmuir, 19 (3). pp. ...
Contents of the 15 Chapter for This Biosurfactants Market Study:-. Chapter 1: to describe Global Biosurfactants Market Introduction, product scope, market overview, market opportunities, market risk, market driving force;. Chapter 2: to analyze the top manufacturers of Global Biosurfactants Market, with sales, revenue, and price of Global Biosurfactants Market, in 2016 and 2017;. Chapter 3: to display the competitive situation among the top manufacturers, with sales, revenue and market share in 2016 and 2017;. Chapter 4: to show the Global Biosurfactants market by regions, with sales, revenue and market share of Global Biosurfactants Market, for each region, from 2012 to 2017;. Chapter 5, 6, 7, 8 and 9: to analyze the key regions, with sales, revenue and market share by key countries in these regions;. Chapter 10 and 11: to show the market by type and application, with sales market share and growth rate by type, application, Methodology, Analyst Introduction, Data Source from 2012 to ...
In present investigation, B. subtilis and B. cereus was isolated and Identified from the petroleum contaminated site soil and identified by grams staining, motility and biochemical tests. After the isolation and identification, biosurfactant production from bacterial organisms was screened using mineral salt medium, by oil spreading, drop collapse and hemolysis test. From the blood agar plates, the biosurfactant producing bacterial culture were obtained and maintained as stock cultures. Organisms were inoculated into the mineral salt broth with petroleum oil, diesel oil, kerosene oil and crude oil as a carbon source for biosurfactant production. Biosurfactant was extracted by acid precipitation method. Biosurfactants production was optimized by using different pH, temperature, carbon and nitrogen sources. Emulsification activity of biosurfactant was analyzed. The extracted biosurfactant was characterized by using Thin Layer Chromatography (TLC). B.subtilis was able to produce the biosurfactant ...
Most anionic and non-ionic surfactants are nontoxic, having LD50 comparable to sodium chloride. The toxicity of quaternary ammonium compounds, which are antibacterial and antifungal, varies. Dialkyldimethylammonium chlorides (DDAC, DSDMAC) used as fabric softeners have low LD50 (5 g/kg) and are essentially non-toxic, while the disinfectant alkylbenzyldimethylammonium chloride has an LD50 of 0.35 g/kg. Prolonged exposure to surfactants can irritate and damage the skin because surfactants disrupt the lipid membrane that protects skin and other cells. Skin irritancy generally increases in the series non-ionic, amphoteric, anionic, cationic surfactants.[3] Surfactants are routinely deposited in numerous ways on land and into water systems, whether as part of an intended process or as industrial and household waste.[5][6][7] Anionic surfactants can be found in soils as the result of sludge application, wastewater irrigation, and remediation processes. Relatively high concentrations of surfactants ...
TY - CONF. T1 - Biosurfactant production by lactic acid bacteria. AU - Prior, C.. AU - Speelmans, G.. AU - Weusthuis, R.A.. PY - 1998. Y1 - 1998. M3 - Poster. Y2 - 12 March 1998 through 13 March 1998. ER - ...
Granular detergent compositions containing an anionic surfactant, an ethoxylated surfactant solubility aid and a water-soluble neutral or alkaline salt are disclosed. The compositions are prepared by forming an intimate mixture of the anionic and ethoxylated surfactants and then agglomerating the mixture with the neutral or alkaline salt.
Color bleed (the invasion of one color into another on the surface of the print medium) using ink-jet inks is alleviated by employing zwitterionic surfactants (ph-sensitive or pH-insensitive) or ionic or non-ionic amphiphiles. The inks of the invention comprise a vehicle and a cationic dye. The vehicle typically comprises a low viscosity, high boiling point solvent, one or two amphiphiles at concentrations above their critical micelle concentration (cmc), while the dye typically comprises any of the dyes commonly employed in ink-jet printing. The amount of surfactants/amphiphile is described in terms of its critical micelle concentration (cmc), which is a unique value for each amphiphile. Above the cmc, micelles form, which attract the dye molecule and thus control the color bleed. Below the cmc, there is no micelle formation, and thus no control of the color bleed.
The most important daily skin care is to clean our face.A good cleansing will make you fall in love with skin.. How to choose a good cleanser?. When purchase cleanser, ignore the brand factor, the main thing is to see the surface active agent. As for the smell (aroma), preservatives, more important is to look at personal preferences. Different surfactants builds cleansing products, will form a different sense of washing (at the same time the sense of washing will be affected by moisturizing ingredients, thickening ingredients and other effects) and cleanliness. Few cleansers are completely constructed with a single surfactant. Usually with several different surfactants to match up.. Soap-based cleanser. Soap-based cleanser is an anionic surfactant; soap-based cleanser is usually used fatty acids plus alkali ingredients to build cleanser products. Generally speaking, different fatty acids are slightly different after the formation of soap base. For example, the longer the carbon chain, the finer ...
The viscosity of anionic surfactant slurries is increased by admixing with such slurries an effective amount of a viscosity increasing additive selected from the group consisting of dialkyl ethers wherein the alkyl radicals of said ethers contain from 2 to 5 carbon atoms, alkoxyethoxyethanols wherein the alkyl radical contains from 2 to 6 carbon atoms, and tertiary amines wherein the alkyl radical contains from 2 to 4 carbon atoms.
Description: Compositions which contains a sulfur-containing anionic surfactant; e.g., sulfonates, sulfates, sulfosuccinates, isethionates, sarcosinates, taurates, etc ...
The effect of nonionic surfactants on the cationic conjugated polymer (CCP), poly{9,9-bis[6-(N,N-trimethylammonium)hexyl]fluorene-co 1,4-phenylene} iodide 1, has been investigated. It is shown that the CCP in various solvents exists in three phases: isolated polymer chains, polymer aggregate, and variable size clusters (partially dissolved polymer). It is shown that nonionic surfactants enhance the photoluminescence (PL) quantum yield of the CCP in water by breakup of polymer aggregates, which eliminates the nonemissive interchain quenching with aggregates and increases surface-to-volume ratio of the CCP. Furthermore, the surfactants reduce quenching by incorporation of the CCP into aggregates or binary micelles. Surfactant also reduces the polar interaction strength between CCP and water and enhances CCP quenching by the counterions (iodine) by ion pairing effect. The dynamics of the interactions are complex and reveal that the surfactant induces rapid increase in the PL which imply that the ...
1. U.v. difference spectra show that the anionic surfactant sodium n-dodecyl sulphate unfolds ribonuclease A at pH7.3 and 10.3, but that the cationic surfactant n-dodecyltrimethylammonium bromide does not affect the conformation of the enzyme. 2. Equilibrium-dialysis experiments show that sodium n-dodecyl sulphate binds to ribonuclease A, but no binding of n-dodecyltrimethylammonium bromide could be detected at pH7.3. 3. The enzymic activity of ribonuclease A is unaffected by n-dodecyltrimethylammonium bromide up to a concentration of 0.03m at 25°C. 4. Ultracentrifuge studies support the conclusion that n-dodecyltrimethylammonium bromide does not interact significantly with ribonuclease A. 5. The enthalpy change as measured by microcalorimetry on binding of sodium n-dodecyl sulphate to ribonuclease A is consistent with an exothermic enthalpy of binding occurring simultaneously with an endothermic enthalpy of chain unfolding.. ...
To investigate whether nitric oxide (NO) is involved in surfactant-induced systemic and pulmonary vasodilatation in newborn piglets with surfactant deficiency, 2-6-d-old piglets were subjected to repeated saline lung lavages. They were then randomly
Biosurfactants have recently been recognized as important biotechnological products in biomedical, cosmeceutical, and potential food applications owing to their specificity, low toxicity, and biodegradability. In recent years, increasing concern has been placed on the environmental impacts of chemical surfactants. Biosurfactants (BSs) produced by microorganisms such as yeast, fungi, and bacteria are thought to be efficient replacers of chemically synthetic surfactants, and BSs have been developed as suitable alternatives for antimicrobial and biomedical agents. This study aimed to develop of high throughput screening (HTS) method for large amounts of potential candidates. In HTS steps, we developed rapid and simple screening methods for BS-producing yeast to design processes for the production of BS. During the screening for BS-producing yeast, we isolated many BS-producing yeasts which were identified as Aureobasidium pullulans, from wild flowers. A. pullulans is ubiquitous yeast found in ...
Any type of surfactant has a hydrophilic-lipophilic balance number (HLB number) of different. There are several methods for determining the HLB number, with ohysical properties of surfactant (solubility cloud point and interfacial tension), CMC methods and by thermodynamics properties (Free energy Gibbs). This paper proposes to determined HLB numbers from interfelation methods. The result of study indicated that the CMC method described by Hair and Moulik espesially for nonionic surfactant. The application of exess Gibbs free energy and by implication activity coefficient provides the ability to predict the behavior of surfactants in multi component mixtures of different concentration. Determination of HLB number by solubility and cloud point parameter is spesific for anionic and nonionic surfactant but this methods not available for cationic surfactants. ...
Amphiphilic dicationic surfactants, known as gemini surfactants, are currently studied for gene delivery purposes. The gemini surfactant molecule is composed of two hydrophilic
A. Lipid Order Parameter in the Presence of Amphiphilic Molecules The outer lipid membrane surface of eukaryotic cells is generally uncharged. Amphiphilic, water-soluble molecules such as local anesthetics, viral or antibiotic pep-tides, or peptide toxins therefore partition into the bilayer […]
The present invention discloses various embodiments and examples of a thickened aqueous abrasive cleanser capable of maintaining a smoothly flowable or plastic consistency over long periods of time. The cleanser is characterized by the ability to stably suspend abrasives while exhibiting excellent shelf stability over long periods of time with substantially no syneresis and being suitable for use where environmental requirements prevent the use of phosphates. This cleaner has the following ingredients: (a) a colloidal alumina thickener having an average particle size, in dispersion, of no more than about one micron; (b) an electrolyte/buffer; (c) a surfactant system including two surfactant components, one surfactant component comprising a fatty acid anionic surfactant, the other surfactant component comprising a selected bleach-stable surfactant or mixed surfactant; (d) a bleach; and (e) a particulate abrasive having an average particle size of about one to as much as 400 microns to provide scouring
Nonionic surfactants are often used in laundry and dishwasher detergents as a cleaning agent. They are also used in cosmetics as emulsifiers, conditioning agents and solubilizing agents and to boost...
Surface treatment compositions comprising certain cationic polymer(s), anionic surfactant, one or more shielding salts and hydrophobic association disruptor. The surface treatment compositions comprise at least about 6 % by weight of cationic polymer, at least about 6% by weight anionic surfactant, and at least about 4 % by weight of the shielding salt. The weight ratio of anionic surfactant to cationic polymer is between about 0.5:1 and about 4:1. The composition may also have a weight ratio of shielding salt to cationic polymer of between about 0.3:1 and about 3:1.
Biosurfactants or surface-active compounds are produced by microoaganisms. These molecules reduce surface tension both aqueous solutions and hydrocarbon mixtures. In this study, isolation and identification of biosurfactant producing bacteria were assessed. The potential application of these bacteria in petroleum industry was investigated. Samples (crude oil) were collected from oil wells and 45 strains were isolated. To confirm the ability of isolates in biosurfactant production, haemolysis test, emulsification test and measurement of surface tension were conducted. We also evaluated the effect of different pH, salinity concentrations, and temperatures on biosurfactant production. Among importance features of the isolated strains, one of the strains (NO.4: Bacillus ...
Abstract: We present a large range of experimental data concerning the influence of surfactants on the well-known Landau-Levich-Derjaguin experiment where a liquid film is generated by pulling a plate out of a bath. The thickness h of the film was measured as a function of the pulling velocity V for different kinds of surfactants (C12E6, which is a nonionic surfactant, and DeTAB and DTAB, which are ionic) and at various concentrations near and above the critical micellar concentration (cmc). We report the thickening factor alpha = h/h(LLD), where h(LLD) is the film thickness obtained without a surfactant effect, i.e., as for a pure fluid but with the same viscosity and surface tension as the surfactant solution, over a wide range of capillary numbers (Ca = eta V/gamma, with eta being the surfactant solution viscosity and gamma its surface tension) and identify three regimes: (i) at small Ca alpha is large due to confinement and surface elasticity (or Marangoni) effects, (ii) for increasing Ca ...
Petroleum reservoirs have long been known as the hosts of extremophilic microorganisms. Some of these microorganisms are known for their potential biotechno ...
[140 Pages Report] Crop Oil Concentrates Market by Surfactant Concentration, Crop Type (Cereals & grains, Oilseeds & Pulses, and Fruits & Vegetables), Application (Herbicides, Insecticides, and Fungicides), and Region
A liquid and readily flowable composition includes (a) a room-temperature-solid solute, such as a nonionic surfactant, preferably having a hydrophile-lipophile balance from about 11.1 to about 18.4, a (ii) C8-C14 fatty acid, or combinations thereof; (b) an alkoxylated fatty alkanolamide; and (c) water, if needed. The alkoxylated fatty alkanolamide, which is substantially liquid at room temperature, solvates the solid solute to form a homogeneous composition which is liquid and readily flowable at room temperature. The select classes of nonionic surfactants include polyalkylene oxide carboxylic acid esters, ethoxylated fatty alcohols, poloxamers, alkyl polysaccharides, or combinations thereof. Useful alkoxylated fatty alkanolamides include propoxylated fatty ethanolamides.
[106 Pages Report] Check for Discount on Global Microbial Biosurfactants Market by Manufacturers, Regions, Type and Application, Forecast to 2021 report by Global Info Research. Biosurfactants can be defined as the surface-active biomolecules produced...
296861376 - EP 0968269 A1 2000-01-05 - DETERGENT COMPOSITIONS - [origin: WO9817769A1] The present invention relates to detergent compositions or components thereof containing a cellulytic enzyme and one or more cationic surfactants of the formula: R 1 R 2 R 3 R 4 N + X - in which R 1 is a hydroxyalkyl group having no greater than 6 carbon atoms; each of R 2 and R 3 is independently selected from C1-4 alkyl or alkenyl; R 4 is a C5-9 alkyl or alkenyl; and X - is a counterion. The cationic surfactant may comprise a mixture of surfactants where at least 10 % by weight of the mixture has R 4 of C9 or below, or where R 4 is a Cn alkyl group of from more than 8 to 11, and a C(n-2) alkyl group, respectively.[origin: WO9817769A1] The present invention relates to detergent compositions or components thereof containing a cellulytic enzyme and one or more cationic surfactants of the formula: R 1 R 2 R 3 R 4 N + X - in which R 1 is a hydroxyalkyl group having no greater than 6 carbon atoms; each of R 2
Calfax® 10L-45 is a light amber, water soluble surface active agent that contains no halogenated solvents. It is an aqueous surfactant solution that is ...
Micellar solubilization is a method used for improving the solubility of poorly soluble drugs with the goal of preparing efficient pharmaceutical formulations. Dexamethasone is a synthetic glucocorticoid poorly soluble in water. In this work dexamethasone solubilization potential has been examined by using polysorbate 80 as an nonionic surface active agent in a complex dispersion medium of Krebs-Ringer buffer (pH = 7,4). In the concentration area lower than the critical micellar concentration of polysorbate 80, dexamethasone solubility remained unchanged while the concentration area above the critical micellar concentration of polysorbate 80 showed a significant increase in dexamethasone solubility due to the incorporation of dexamethasone in polysorbate 80 micelles via the process of micellar solubilization. Size and distribution of size of polysorbate 80 micelles, with or without incorporated dexamethasone, was determined by using the photon correlation spectroscopy method. The size of empty ...
This study was focused on the description of interaction between Cu2+ ions and the 1:1 mono- and dirhamnolipid mixtures in the premicellar and aggregated state in water and 20 mM KCl solution at pH 5.5 and 6.0. The critical micelle concentration of biosurfactants was determined conductometrically and by the pH measurements. Hydrodynamic diameter and electrophoretic mobility were determined in micellar solutions using dynamic light scattering and laser Doppler electrophoresis, respectively. The copper immobilization by rhamnolipids, methylglycinediacetic acid (MGDA), and ethylenediaminetetraacetic acid (EDTA) was estimated potentiometrically for the Cu2+ to chelating agent molar ratio from 16:100 to 200:100. The degree of ion binding and the complex stability constant were calculated at a 1:1 metal to chelant molar ratio. The aggregates of rhamnolipids (diameter of 43-89 nm) were negatively charged. Biosurfactants revealed the best chelating activities in premicellar solutions. For all chelants studied
A system for delivering a chemical agent in the form of a spray or foam, which in a preferred embodiment involves the use of an aerosol dispenser to deliver a formulation containing both an anionic surface active agent such as sodium lauryl sulfate as a foaming agent and a chemical agent such as either hydrogen peroxide as a disinfecting chemical agent or natural sea water.
To improve the flow characteristics of screening media, specific surface active agents can be used. For example, N acyl sarcosine surfactants are parti...
1987 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 119, p. 155-167Article in journal (Refereed) ...
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