Interaction of phosphotungstate ions with phospholipid monolayers. A synchrontron X-ray study

G. T. Barnes*, I. R. Gentle, C. H L Kennard, J. B. Peng, I. Mc L Jamie

*Corresponding author for this work

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The surface pressure-area isotherms of monolayers of several phospholipids are markedly altered by the presence of phosphotungstate ions in the aqueous subphase at low values of pH (Gorwyn, D.; Barnes, G. T. Langmuir 1990, 6, 222). These changes have now been studied by grazing incidence synchrotron X-rays diffraction. Where the monolayer was in a condensed monolayer state the 2θ scans revealed a single peak consistent with hexagonal packing of the acyl chains despite the diacyl structure of the phospholipids. Addition of phosphotungstate to the subphase at pH 2 caused this peak to disappear, suggesting a disruption of the regular chain packing, and examination of the concomitant surface pressure-area isotherms showed that there had been a transition from a condensed to an expanded phase.

Original languageEnglish
Pages (from-to)281-285
Number of pages5
JournalLangmuir
Volume11
Issue number1
Publication statusPublished - Jan 1995
Externally publishedYes

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