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  Anomalous ph dependence of the coexistence pressure of the polymerizable two-chain n-lipid methyl-bis(pentacosadiinoyl-oxyethyl)-amine

Wagner, D., Hofmann, U. G., Dorn, I., Schmitt, L., Tampe, R., & Gaub, H. E. (1997). Anomalous ph dependence of the coexistence pressure of the polymerizable two-chain n-lipid methyl-bis(pentacosadiinoyl-oxyethyl)-amine. European Biophysics Journal, 26(3), 271-275.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0010-72AE-5 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0010-72AF-3
Genre: Journal Article

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Wagner, D., Author
Hofmann, U. G., Author
Dorn, I., Author
Schmitt, L., Author
Tampe, R.1, Author
Gaub, H. E., Author
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1External Organizations, ou_persistent22              

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Free keywords: Diacetylenic lipids; Polymerization; Microfluorescence; Filmbalance; Afm.; Pentacosadiynoic amide; Molecular films; Monolayers.; Biochemistry & biophysics.
 Abstract: 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]

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 Dates: 1997
 Publication Status: Issued
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 Identifiers: eDoc: 318315
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Title: European Biophysics Journal
Source Genre: Journal
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Pages: - Volume / Issue: 26 (3) Sequence Number: - Start / End Page: 271 - 275 Identifier: -