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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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資料種別: 学術論文

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 作成者:
Wagner, D., 著者
Hofmann, U. G., 著者
Dorn, I., 著者
Schmitt, L., 著者
Tampe, R.1, 著者
Gaub, H. E., 著者
所属:
1External Organizations, ou_persistent22              

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キーワード: Diacetylenic lipids; Polymerization; Microfluorescence; Filmbalance; Afm.; Pentacosadiynoic amide; Molecular films; Monolayers.; Biochemistry & biophysics.
 要旨: 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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 日付: 1997
 出版の状態: 出版
 ページ: -
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 識別子(DOI, ISBNなど): eDoc: 318315
 学位: -

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出版物名: European Biophysics Journal
種別: 学術雑誌
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ページ: - 巻号: 26 (3) 通巻号: - 開始・終了ページ: 271 - 275 識別子(ISBN, ISSN, DOIなど): -