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Extreme pH-induced lateral reorganization of supported lipid bilayer by fluorescence microscope

Sheng Jie Zhang Guo-Liang Li Yu-Qiang Zhu Tao Jiang Zhong-Ying

Extreme pH-induced lateral reorganization of supported lipid bilayer by fluorescence microscope

Sheng Jie, Zhang Guo-Liang, Li Yu-Qiang, Zhu Tao, Jiang Zhong-Ying
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  • Received Date:  23 October 2013
  • Accepted Date:  09 December 2013
  • Published Online:  05 March 2014

Extreme pH-induced lateral reorganization of supported lipid bilayer by fluorescence microscope

  • 1. Physics School of Nanjing University, Nanjing 210093, China;
  • 2. College of Electronic and Information Engineering, Yili Normal University, Yining 835000, China;
  • 3. Physical Science and Technology, Yili Normal University, Yining 835000, China
Fund Project:  Project supported by the National Basic Research Program of China (Grant No. 2012CB821500) and the National Natural Science Foundation of China (Grant Nos. 21264016, 21364016).

Abstract: The extreme pH-induced lateral reorganization of supported lipid bilayer membranes are studied by fluorescence microscopy. The results show that the fluid dioleoyl-phosphatidylcholine bilayers in extreme acidic or basic solution presents a similar phenomenon to endocytosis and exocytosis, such as rupture, detachment, budding, formation of microtubules etc. In the view of the interaction of polar molecules with H+/H3O+ or OH ions, we conclude that the zwitterionic phospholipid headgroup as core adsorbs the H+/H3O+ or OH ions in electrolyte solution. The asymmetric charge adsorption quantity of the lipid headgroups leads to the effective area discrepancy between the outer and inner leaflets of lipid bilayers. The asymmetric membrane curvatures induce a variety of structures and dynamic responses. The present study helps explain lipid membranes reorganization under extreme pH conditions and provides some guidelines for deformation process of lipid membranes.

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