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

  • Maget-Dana R
  • Ptak M
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Abstract

The interfacial properties of surfactin were studied. The adsorption at the air-water interface was detectable at 5 × 10-8M. The compression isotherms of surfactin films have been recorded as a function of the pH subphase and the pK at the interface determined (pK {reversed tilde equals} 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. © 1992.

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Authors

  • Régine Maget-Dana

  • Marius Ptak

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