engleski

On the surface properties of oleate micelles and oleic acid/oleate vesicles studied by spin labeling

Dilute aqueous systems composed of sodium oleate micelles and sodium oleate/oleic acid vesicles were investigated as a function of pH by a electron spin resonance spectroscopy with TEMPO-stearate and TEMPO-stearamide as well as with a positively charged water soluble spin label, TEMPO-choline. The dynamics of the three TEMPO-spin labels were found to be sensitive to changes in the interfacial region of the aggregates as a function of pH. The results obtained were consistent with the formation of a hydrogen bond network at the surface of the sodium oleate/oleic acid system in the course of the transformation of the micelles into the closed bilayers (vesicles).

spin labeling; micelles; vesicles; oleic acid; sodium oleate; hydrogen bond netwoking

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