6533b82efe1ef96bd12927d9

RESEARCH PRODUCT

Bimodal Effect of Amphiphilic Biocide Concentrations on Fluidity of Lipid Membranes

Stanislaw PrzestalskiStanislaw WagaDariusz ManMarian Podolak

subject

chemistry.chemical_classificationLiposomefood.ingredientMembrane FluidityBinding energyInorganic chemistryElectron Spin Resonance SpectroscopyEgg YolkModels BiologicalLecithinGeneral Biochemistry Genetics and Molecular BiologyDivalentCyclic N-OxidesQuaternary Ammonium CompoundsMembranefoodchemistryBiochemistryLiposomesPhosphatidylcholinesMembrane fluiditySpin LabelsUltrasonicsSpin labelAlkyl

description

Abstract 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 positive charge minimum fluidity of membrane structure occurs in the range of 1 to 3%, with compounds containing double positive charge -in the range of 4 -6 % . That effect does not depend on polar head size and length of alkyl chains of the AS used. Analysis of the electrostatic interaction between positive charges and dipole system suggest that at low ion concentrations the binding energy of the system increases, while it decreases at high concentrations. For the model presented, maxi­mum of binding energy of the system occurs at 3% of positive monovalent ions and at 6% of positive divalent ions admixed.

yearjournalcountryeditionlanguage
1996-11-01Zeitschrift für Naturforschung C
https://doi.org/10.1515/znc-1996-11-1214