LECITHIN ORGANOGELS WITH ALKYLGLUCOSIDES

Oscillation rheology was used to study the viscoelastic properties of lecithin organogels with included alpha- and beta-anomers of alkylgluc osides as well as their derivatives containing an alkyl chain of vario us length. The alkylglucosides caused an equal decrease of zero shear viscosity. Pronounced difference was established in their effects on t he plateau modulus. Derivatives with a shorter alkyl chain brought abo ut an increase in the plateau modulus, whereas derivatives with a long er chain decreased it, FTIR spectroscopic measurements showed that the re is a distinction in the alkylglucoside effect on hydrogen bonds for med by the lecithin phosphate group. It was suggested that the changes observed in the molecular interactions within micelles are responsibl e for the variation of the rheological parameters through the relaxati on time for the micellar breaking/recombination. (C) 1998 Academic Pre ss.