EN
It was found that quaternary ammonium salt derivatives of glycine ester (GE) admixtures induced increased fluidity of egg yolk lecithin (EYL) liposome membranes (L). The increase depended on chain-lengths of the GEs added and on their concentrations. A maximum fluidity was observed with the 12-carbon atom compound. From considerations concerning the electrostatic interactions in the hydrophilic layer of the liposome mebranes it follows that GEs at low concentrations can induce an increase of binding energy of the layer, while at hihger concentrations the opposite effect can occur.