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由盐屏蔽的Zwitterionic Osmolytes复活了静电相互作用
Roy Govrin1, Shani Tcherner1, Tal Obstbaum1
1Department of Physics and the Russell Berrie Nanotechnology Institute , Technion-Israel Institute of Technology , Technion City, Haifa 3200003 , Israel.
Journal of the American Chemical Society
|October 10, 2018
概括
兹维特里克酸盐可以抵消盐分
科学领域:
- 生物物理
- 物理化学
背景情况:
- 细胞使用zwitterionic结体来管理来自盐的结应激.
- 这些化合物在高离子强度环境中稳定蛋白质和酶活性.
- 然而,奥斯莫利特的静电影响仍未得到充分研究.
研究的目的:
- 研究zwitterionic酸盐如何影响盐溶液中的静电相互作用.
- 确定奥斯莫利特在调节盐对充电表面的选作用中的作用.
- 探索各种盐和酸盐对静电力的联合影响.
主要方法:
- 使用原子力显微镜探测负电荷的表面之间的相互作用.
- 检查了五种不同盐 (NaCl,KCl,CsCl,MgCl2,CaCl2) 和五种zwitterionic酸盐 (贝他因,普罗林,三甲基胺N-氧化物,甘氨酸,氨酸) 的混合物.
- 不同的溶液度和pH值,以分析对静电力的影响.
主要成果:
- 所有测试的氧化物都降低了盐对静电排斥的选效应.
- 通过脱离质子和离子来增加溶液选长度和增强负面电荷.
- 这些效应与奥斯莫利特比水更高的分子极化性有关.
- 观察到一种溶性霍夫梅斯特效应,这取决于溶物的疏水性和阴离体的水分.
结论:
- 在生物相关的盐溶液中显著改变静电相互作用.
- 通过修改溶液特性和表面电荷来增强静电排斥.
- 这些发现提供了更现实的细胞系库伦相互作用模型,突出显示了一个尚未研究的领域.
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