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A H-1-NMR study of the permeation of glycolic acid through phospholipid membranes

TitleA H-1-NMR study of the permeation of glycolic acid through phospholipid membranes
Publication TypeJournal Article
Year of Publication1999
AuthorsMales, RG, Herring, FG
JournalBiochimica Et Biophysica Acta-Biomembranes
Volume1416
Pagination333-338
Date PublishedJan
Type of ArticleArticle
ISBN Number0005-2736
KeywordsACETIC-ACID, acne, aging of the, BILAYER-MEMBRANES, CHOLESTEROL, CHOLESTEROL CONTENT, glycolic acid, H-1-NMR, HUMAN ERYTHROCYTES, LAIDLAWII-B-CELLS, LARGE UNILAMELLAR VESICLES, lipid, NONELECTROLYTE, NUCLEAR MAGNETIC-RESONANCE, permeability, SKIN, transmembrane permeability, TRANSPORT, WATER
Abstract

The transmembrane permeability coefficient of the alpha-hydroxyacid, glycolic acid, has been measured for egg phosphatidylcholine large unilamellar vesicles. The determination of the vesicle concentration independent first-order rate constant for membrane transport and the permeability coefficient were made using an NMR technique employing shift agents. Both the temperature dependence and the dependence on cholesterol content were investigated. The activation energy and the Arrhenius pre-exponential factor were found to be dependent on the cholesterol content. A marked increase in both parameters was observed up to 20 mol% cholesterol, with a further, small increase up to 50%. The pH dependence of permeability was also investigated. An increase in permeability is observed with a decrease in pH, providing a possible explanation for the effectiveness of glycolic acid in skin treatment. (C) 1999 Published by Elsevier Science B.V. All rights reserved.

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