水性有机溶剂混合物中小溶液的溶解及其对逆相液态染色学的影响
Andreas Steinhoff1, Alexandra Höltzel1, Ulrich Tallarek1
1Department of Chemistry, Philipps-Universität Marburg, Hans-Meerwein-Strasse 4, Marburg 35032, Germany.
The journal of physical chemistry. B
|November 9, 2023
概括
在水-有机溶剂移动相中通过有机溶剂优先溶解分析物,显著影响反相液色谱 (RPLC) 保留. 溶解水结合是限制水静止相保留的一个关键因素.
科学领域:
- 分析化学 分析化学
- 物理化学 物理化学
- 染色体学 染色体学 是一种染色学.
背景情况:
- 反相液态色谱 (RPLC) 使用水有机溶剂 (W-OS) 移动相.
- 在这些移动阶段内,溶解物的偏好溶解 (PS) 是一个关键的,但往往被忽视的,影响保留的因素.
- 了解溶解物溶解对于优化RPLC分离至关重要.
研究的目的:
- 调查溶液溶解在移动阶段对RPLC保留的作用.
- 为了将分子动力学模拟与实验RPLC数据相关联.
- 阐明不同W-OS混合物对溶液的行为和保留的影响.
主要方法:
- 在W-甲醇 (MeOH) 和W-乙二 (ACN) 混合物中的小,中性溶液的分子动力学模拟.
- 在各种W/OS比率中分析RPLC实验中的保留数据.
- 基克伍德-巴夫积分和差异空间分布函数的应用.
- 溶解物-溶剂结相互作用的分析.
主要成果:
- 柯克伍德-巴夫积分揭示了有机溶剂对分析物的优先溶解,而死亡时间标记器显示低或负PS.
- W-ACN混合物表现出比W-MeOH更强的PS,与ACN的较高化剂强度相关.
- 观察到异型溶解,碳化合物元素有过多的有机溶剂,功能组有过多的水.
- 溶解水结合被确定为主要的保留限制因素.
结论:
- 在W-OS移动相中的溶液溶解对于RPLC保留至关重要.
- 溶液中的碳化合物元素与疏水性静止阶段相互作用,而功能组与水相互作用.
- W-OS相互作用和溶液-水结合对于理解和预测RPLC保留行为至关重要.
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