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Surfactin: interfacial properties and interactions with membrane lipids in mixed monolayers

Authors
Journal
Thin Solid Films
0040-6090
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/0040-6090(92)90387-q

Abstract

Abstract The interfacial properties of surfactin were studied. The adsorption at the air-water interface was detectable at 5 × 10 −8 M. The compression isotherms of surfactin films have been recorded as a function of the pH subphase and the p K at the interface determined (p K ⋍ 6.5). In mixed lipid monolayers ionized surfactin ismiscible with DMPC. When surfactin is protonated, the mean area-composition plots followed the additivity rule. In mixed surfactin/cholosterol the mean are plots show positive deviations suggesting the formation of bidimensional patches.

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