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          Institute: MPI für Biochemie     Collection: Structural Biology (W. Baumeister)     Display Documents

ID: 318315.0, MPI für Biochemie / Structural Biology (W. Baumeister)
Anomalous ph dependence of the coexistence pressure of the polymerizable two-chain n-lipid methyl-bis(pentacosadiinoyl-oxyethyl)-amine
Authors:Wagner, D.; Hofmann, U. G.; Dorn, I.; Schmitt, L.; Tampe, R.; Gaub, H. E.
Date of Publication (YYYY-MM-DD):1997
Title of Journal:European Biophysics Journal
Issue / Number:3
Start Page:271
End Page:275
Review Status:not specified
Audience:Not Specified
Abstract / Description:Molecular films from polymeric materials play an important role in basic research as well as in technology. We have synthesized the double chain diacetylenic ammonium lipid N-bis-(10, 12-pentacosadiinoyl)-oxyethyl)-N-methyl-amine (ONCO). We have characterized monomolecular films at the air/water interface by means of microfluorescence filmbalance techniques and by atomic force microscopy (AFM). ONCO forms stable monomolecular films that exhibit a fluid-solid phase transition with a transition enthalpy of 90 kJ/mol at 10 degrees C and neutral pH. The coexistence pressure was found to decrease with decreasing protonation, which is in contrast to the commonly found Coulomb mechanism. A change in the chain packing due to a different nitrogen bond angle is discussed as a possible mechanism. This model is corroborated by the finding that crystals at high and at low pH differ in their polymerization properties as measured by microfluorescence. [References: 23]
Free Keywords:Diacetylenic lipids; Polymerization; Microfluorescence; Filmbalance; Afm.; Pentacosadiynoic amide; Molecular films; Monolayers.; Biochemistry & biophysics.
External Publication Status:published
Document Type:Article
Communicated by:Anton Hillebrand
Affiliations:MPI für Biochemie/Structural Biology (W. Baumeister)
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