Influence of La3+ on the Phase Behavior and the Pluidity of Phospholipid Bilayers

Chem. J. Chinese Universities ›› 1995, Vol. 16 ›› Issue (S1): 91.

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Influence of La³⁺ on the Phase Behavior and the Pluidity of Phospholipid Bilayers

LI Xin-min¹, ZHAO Bing², NI Jia-zuan¹, WU Ying², XU Wei-qing², CHEN Jian-Wen³

1. Laboratory of Rare Earth Chemistry and Physics, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China;
2. Key Laboratory for Molecular Spectra and Structure, Jilin University, Changchun, 130023 P. R. China;
3. State Key Laboratory of Biomacromolecuies, Institute of Biophysics Chinese Academy of Sciences, Beijing, 100101, P. R. China

Received:1995-07-31 Online:1995-12-31 Published:1995-12-31
Supported by:
National Program "the Basic Research of Rare Earth Science" of China and the National Natural Science Foundation of China

Abstract

Abstract:

The influence of La³⁺ on the phase behavior and the fluidity of the negatively charged phospholipid dipalmitoylphosphatidylglycerol(DPPG) bilayers was studied by differential scanning calorimetry (DSC) and FT-Raman spectroscopy. La³⁺, induced a phase separation of DPPG bilayers, and formed three peaks. La³⁺ increased the phase transition temperature of the new peaks, broadened the half width of the DSC signal, and stabilized a gel phase relative to a crystalline phase of DPPG bilayers. La³⁺ was shown to increase interchain order and intermolecular ordering of the lipid lattice, and decreased the fluidity of DPPG bilayers.

Key words: Phase bahavior, Phospholipid, Dipalmitoylphosphatidylglycerol

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LI Xin-min, ZHAO Bing, NI Jia-zuan, WU Ying, XU Wei-qing, CHEN Jian-Wen, HUANG Fen. Influence of La³⁺ on the Phase Behavior and the Pluidity of Phospholipid Bilayers[J]. Chem. J. Chinese Universities, 1995, 16(S1): 91.

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Influence of La³⁺ on the Phase Behavior and the Pluidity of Phospholipid Bilayers

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