MD/QM/CSM方法计算β-环糊精及其衍生物对二甲四氯的包合机理

doi:10.16085/j.issn.1000-6613.2015.12.009

化工进展 ›› 2015, Vol. 34 ›› Issue (12): 4185-4190.DOI: 10.16085/j.issn.1000-6613.2015.12.009

MD/QM/CSM方法计算β-环糊精及其衍生物对二甲四氯的包合机理

周玉梅, 周宝晶, 聂雪玫, 叶仁龙, 贡雪东, 朱卫华, 肖鹤鸣

南京理工大学化工学院, 分子与材料计算研究所, 江苏南京 210094

收稿日期:2015-03-30 修回日期:2015-04-26 出版日期:2015-12-05 发布日期:2015-12-05
通讯作者: 周宝晶,副教授,硕士生导师,研究方向为理论计算与应用化学。E-mailbzhou@njust.edu.cn。
作者简介:周玉梅(1989—),女,硕士研究生。E-mailmeiyuzhou@qq.com。
基金资助:
中央高校基本科研业务费专项项目(30915011314)。

A theoretical study on the microencapsulation of herbicide MCPA with native β-cyclodextrin and its derivatives by a molecular dynamics/quantum mechanics/continuum solvent model approach

ZHOU Yumei, ZHOU Baojing, NIE Xuemei, YE Renlong, GONG Xuedong, ZHU Weihua, XIAO Heming

Computational Institute for Molecules and Materials, School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China

Received:2015-03-30 Revised:2015-04-26 Online:2015-12-05 Published:2015-12-05

摘要/Abstract

摘要： 利用β-环糊精(β-CD)及其衍生物控制二甲四氯农药分子的释放是目前研究的热点。本文使用一种最近发展的分子动力学/量子力学/连续介质溶剂模型(MD/QM/CSM)方法计算β-CD及其甲基、羟丙基衍生物对二甲四氯(MPCA)农药分子的包合机理。揭示了溶剂效应在决定对这3种CD相对包合能力时发挥了主导作用,而真空包合自由能顺序与溶剂中的正好相反。算得的3个体系包合能力强弱排序为:DM-β-CD>HP-β-CD>β-CD,与实验测量结果一致,且线性相关度达到R=0.99。结果表明:MD/QM/CSM方法对于计算不同主体的超分子复合物体系的相对稳定性是可靠的。

关键词: 计算化学, 热力学性质, 隐溶剂模型, 包合自由能, 环糊精

Abstract: Microencapsulation is an effective technology to reduce the environmental losses of pesticides during their use. This paper reports the complexation mechanism of chlorophenoxy herbicide MCPA with native β-cyclodextrin (CD) and its methyl and hydroxypropyl derivatives by a molecular dynamics/quantum mechanics/continuum solvent model (MD/QM/CSM) approach developed recently. The results reveal that the solvation effect plays a dominant role in determining the relative stabilities of the three CD/MPCA inclusion complexes. However,the results in vacuum environment are opposite to those in solvent media. The calculated relative binding affinities of the three systems in aqueous solution decrease in the order:DM-β-CD>HP-β-CD>β-CD,which agrees with the experimental results,with a correlation coefficient R=0.99. This demonstrates that the MD/QM/CSM method is able to determine the relative stability of host-guest systems with different host molecule.

Key words: computational chemistry, thermodynamic properties, continuum solvent modeling, binding affinity, cyclodextrin

中图分类号:

TQ028.8

周玉梅, 周宝晶, 聂雪玫, 叶仁龙, 贡雪东, 朱卫华, 肖鹤鸣. MD/QM/CSM方法计算β-环糊精及其衍生物对二甲四氯的包合机理[J]. 化工进展, 2015, 34(12): 4185-4190.

ZHOU Yumei, ZHOU Baojing, NIE Xuemei, YE Renlong, GONG Xuedong, ZHU Weihua, XIAO Heming. A theoretical study on the microencapsulation of herbicide MCPA with native β-cyclodextrin and its derivatives by a molecular dynamics/quantum mechanics/continuum solvent model approach[J]. Chemical Industry and Engineering Progree, 2015, 34(12): 4185-4190.

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MD/QM/CSM方法计算β-环糊精及其衍生物对二甲四氯的包合机理

A theoretical study on the microencapsulation of herbicide MCPA with native β-cyclodextrin and its derivatives by a molecular dynamics/quantum mechanics/continuum solvent model approach

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