作为 riboflavin 在水性介质中的可溶性限制因子的自我结合
Nadja Ulmann1, Johnny Hioe1, Didier Touraud1
1Institute of Physical and Theoretical Chemistry, University of Regensburg, Universitätsstrasse 31, 93053 Regensburg, Germany. Nadja.Ulmann@ur.de.
Physical chemistry chemical physics : PCCP
|July 2, 2024
概括
由于异氨酸的 π 堆积,氨酸 (RF) 聚合在水中,限制了其溶解性. 在热力学上更喜欢的延长式利比链形状,进一步降低溶解度,与更容易溶解的利比-5'-单酸盐不同.
科学领域:
- 生物化学 生物化学
- 物理化学 物理化学
- 计算化学计算化学
背景情况:
- рибофлавин (RF) 是一种具有较低水溶性的必需维生素,阻碍了其应用.
- 了解射频聚合和溶解性的分子基础对于其配方和生物可用性至关重要.
研究的目的:
- 阐明 riboflavin 的聚合和低水溶性背后的分子机制.
- 调查 π 堆积和基链构成在确定射频溶解度中的作用.
主要方法:
- 单晶X射线衍射分析晶体结构.
- 经典分子动力学 (MD) 模拟用于研究水中的射频聚合.
- 雨采样用于计算RF分离的平均力潜力.
- 用COSMO-RS (COnductor-like Screening Model for Real Solvents) 来进行可溶性预测. 这是一个非常好的方法.
- 核复杂效应光谱 (NOESY) 用于相关化合物的结构分析.
主要成果:
- X射线衍射揭示了在射频晶体中的异氧单元的 π 堆叠.
- MD模拟显示了水中RF的反对齐聚合,由分散相互作用驱动.
- 雨采样表明,在分离射频和光色时存在相似的力量,这证实了聚合中的分散力.
- 预测COSMO-RS和MD在热力学上更喜欢延长的利比链形状,这显著降低了预测的溶解度.
- 利博胺5-单酸盐的NOESY证实了π堆叠和扭曲的酸链,与其更高的溶解度相关.
结论:
- riboflavin 聚合,主要是由于 isoalloxazine π 堆积,是限制其水溶性的主要因素.
- 在热力学上有利于扩展的利比链形状进一步降低了射频溶解度.
- 利比链的构成在调节射频溶解度方面发挥着重要作用,与更容易溶解的利比-5-单酸盐形成鲜明对比.
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