溶解物探头水化在特定的协会的环氧德克斯和阿达曼坦
Daniel Harries1, Donald C Rau, V Adrian Parsegian
1Laboratory of Physical and Structural Biology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892-0924, USA. harries@helix.nih.gov
Journal of the American Chemical Society
|February 17, 2005
概括
贝塔-环氧德 (CD) 和阿达曼坦碳酸盐 (AD) 的结合会释放水. 与CD/AD结合的溶液相互作用显示了水化变化和力-力补偿效应.
科学领域:
- 超分子化学 超分子化学
- 物理化学 物理化学
- 生物物理化学 生物物理化学
背景情况:
- 贝塔-环氧德克斯 (CD) 和阿达曼坦碳酸盐 (AD) 形成了纳入复合体.
- 溶剂效应,包括水化和溶解物相互作用,显著影响结合热力学.
- 了解这些相互作用对于分子识别和药物输送应用至关重要.
研究的目的:
- 量化beta-cyclodextrin与阿达曼坦碳酸盐在添加各种溶液后的结合自由能量的变化.
- 调查优先水和溶解物排除在结合过程中的作用.
- 阐明溶解物对宿主-客人复合的作用的热力学基础.
主要方法:
- 微热量计用于测量CD-AD协会的结合热力学 (,,自由能量) 在不同溶液的存在下.
- 溶液的透压变化以探测结合常数和优先水的变化.
- 用蒸汽压力奥斯米度独立评估反应剂和产品的水合度.
主要成果:
- CD-AD协会释放15-25个水分子,表明水分的显著变化.
- 溶液的类型会影响水化变化,反映了与反应物或产品的优先相互作用.
- 在所有溶液中观察到一个很大的变化,与不同程度的补偿.
- 释放的水的数量与溶解物对空气-水表面张力的影响相关.
结论:
- 从交互表面的溶液排除驱动在CD-AD复合体形成过程中偏好的水合的变化.
- 度-度补偿在调节结合热力学方面发挥着关键作用,以应对不同的溶液.
- 这些发现为控制溶液与宿主相互作用的力量及其对分子识别的影响提供了洞察力.
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