There are new chemical substances that increase the strength of washing products such as surfactants. However, these products are not biodegradable and can all be found in surface water, groundwater. Cationic surfactants are one of the pollutants of greatest danger to man is his environment. Therefore, we have determined some parameters of three cationic surfactants by molecular modeling, using...

Surfactants are among the most versatile and widely used excipients in pharmaceuticals. This versatility, together with their pH-responsive membrane-disruptive activity and low toxicity, could also enable their potential application in drug delivery systems. Five anionic lysine-based surfactants which differ in the nature of their counterion were studied. Their capacity to disrupt the cell memb...

This laboratory study examined viability and infectivity of the entomopathogenic nematode (EPN) Heterorhabditis bacteriophora Poinar in solutions containing four different turfgrass soil surfactants: Revolution (Aquatrols Corp., Paulsboro, NJ), Aqueduct (Aquatrols Corp., Paulsboro, NJ), Cascade Plus (Precision Laboratories Inc., Waukegan, IL) and OARS (Aqua-Aid Inc., Rocky Mount, NC). Infective...

The interaction forces provided by silicone polyether (SPE) surfactants, adsorbed at the interface of octadecyltrichlorosilan monolayer and aqueous surfactant solution, were measured by atomic force microscopy. Changes in the forces in the presence of ethanol were examined for a series of comb-type SPE surfactants. It was found that the steric repulsion provided by the SPE molecules persisted u...

Membrane proteins play vital roles in every aspect of cellular activities. To study diverse membrane proteins, it is crucial to select the right surfactants to stabilize them for analysis. Despite much effort, little progress has been made in elucidating their structure and function, largely because of a lack of suitable surfactants. Here we report the stabilization of a G protein-coupled recep...

Surface tensiometry and small-angle neutron scattering have been used to characterize a new class of low-surface energy surfactants (LSESs), "hedgehog" surfactants. These surfactants are based on highly branched hydrocarbon (HC) chains as replacements for environmentally hazardous fluorocarbon surfactants and polymers. Tensiometric analyses indicate that a subtle structural modification in the ...

Kinetics of the title reaction has been carried out by studying the reaction spectrophotometrically at 80 oC and pH 5.0 in presence of cationic gemini (alkanediyl-α, ωbis(dimethylhexadecylammonium bromide)) surfactants. The reaction followed first-order kinetics in [Zn(II)-Gly-Tyr]T complex and fractional-order kinetics in [ninhydrin]T. Typical rate constant (kΨ) increase and leveling-off regio...

Lipid formulations can improve the bioavailability of drugs that have low aqueous solubility. A variety of chemical compounds, including triglyceride oils (lipids), fatty acid esters and surfactants, can be included in lipid formulations. This heterogeneity makes spectroscopic study of the in ternal structure of formulation difficult. Understanding of lipid formulations at a molecular level wil...

Fluorescence analysis is a simple and highly sensitive method for detection of small amounts biologically active substances. In this study, complexation terbium(III) chelates with 1,10-phenanthroline ascorbic acid (AA) luminescent properties complexes were investigated. The influence pH solubilization by micellar solutions nonionic, cationic, anionic surfactants on fluorescence was studied. que...