Incubation of liposomes prepared by sonication of egg lecithin with the amphipathic form of cytochrome b5 results in the binding of a maximum of 244 molecules of cytochrome b5 per liposomal vesicle. Interactions of the phospholipid with the hydrophobic segment of cytochrome b5 are involved in this binding which does not disrupt the liposome. When a small amount of NADH-cytochrome b5 reductase i...

We describe a novel liposome-based immunoassay in which covalently linked hapten-cytolysin conjugates are used instead of complement and surface-immobilized immunoreagents. Stable, unilamellar liposomes containing entrapped alkaline phosphatase as a marker enzyme were prepared by dialysis of octyl glucoside from suspensions of cholesterol and egg yolk lecithin. The resulting vesicles could be i...

The surface properties of cholesteryl palmitate, stearate, linoleate, linolenate, arachidonate, and acetate were investigated. Long-chain esters were not surface-active and force-area (pi-A) isotherms were not obtained. Unsaturated cholesteryl esters were oxidized at the air-water interface and these oxidized lipids gave expanded pi-A isotherms. Cholesteryl acetate had an equilibrium spreading ...

Vibrio parahaemolyticus ( Vp ), a typical microorganism inhabiting marine ecosystems, uses pathogenic virulence molecules such as hemolysins to cause bacterial infections of both human and animals. The thermolabile hemolysin TLH lyses erythrocytes by phospholipase B/A2 enzymatic activity in egg-yolk lecithin. However, few studies have been characterized the biochemical properties use molecular ...

This article provides a brief and basic discussion of Pluronic lecithin organogel to include its history, its components, its mechanism of action, the range of active pharmacological agents that can and cannot be incorporated into a Pluronic lecithin organogel, as well as important information for those pharmacists who compound Pluronic lecithin organogel.

Optical waveguide lightmode spectroscopic (OWLS) techniques were probed for monitoring ion permeation through channels incorporated into artificial lipid environment. A novel sensor set-up was developed by depositing liposomes or cell-derived membrane fragments onto hydrophilic polytetrafluoroethylene (PTFE) membrane. The fibrous material of PTFE membrane could entrap lipoid vesicles and the wa...

Using the spin label method (ESR) it has been shown that biologically active, amphiphilic compounds (quaternary ammonium salts (AS) containing polar heads with single and double positive charge caused, at low concentrations, decrease fluidity of liposome membranes formed with egg yolk lecithin (EYL). At higher concentrations an increase in fluidity was observed. With compounds having a single p...

The enzyme preparations used in this study consisted of particulate fractions from frozen chicken liver or fresh rat liver isolated from 0.25 M sucrose homogenates by a method already described (1). These preparations contained both mitochondria and microsomes. The enzyme was suspended in 0.02 M Tris buffer of pH 8.0 containing 0.001 M Versene in a concentration of 20 to 40 mg. per ml. and coul...

The aim of the work was to quantify possible interactions between surfactants and preservatives, comparing surface properties, in model pharmaceutical formulations. Surface parameters of 2-component surfactant-preservative aquous mixtures were determined with a Wilhelmy plate technique, for the so-called principal surfactants (polysorbate 80, egg lecithin, phosphatidylcholine) and preservatives...