色谱

色谱

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苯甲酸在对叔丁基杯［4］-1,2-冠4固定相上的保留机理

胡锴1, 陈康康1, 张会明1, 刘军伟1, 赵文杰1,2, 张书胜1*   

  1. 1. 郑州大学化学系, 河南 郑州 450052; 2. 河南工业大学化学化工学院, 河南 郑州 450001
  • 收稿日期:2011-05-25 修回日期:2011-08-15 出版日期:2011-11-28 发布日期:2011-12-25
  • 通讯作者: 张书胜,博士,教授,主要研究方向为现代分离科学研究与应用.
  • 基金资助:

    国家自然科学基金项目(Nos. 20875083, 21077095)、环境化学与生态毒理学国家重点实验室开放基金项目(No. KF2008-22)和郑州市人才建设工程基金项目(No. 10LJRC192).

Retention mechanism of benzoic acid on p-tert-butyl- calix［4］arene-1,2-crown-4 stationary phase

HU Kai1, CHEN Kangkang1, ZHANG Huiming1, LIU Junwei1, ZHAO Wenjie1,2, ZHANG Shusheng1*   

  1. 1. Department of Chemistry, Zhengzhou University, Zhengzhou 450052, China; 2. School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, China
  • Received:2011-05-25 Revised:2011-08-15 Online:2011-11-28 Published:2011-12-25

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摘要： 选用自制的对叔丁基杯［4］-1,2-冠-4 (Cx4-4)键合固定相,通过改变流动相中甲醇比例和pH值,考察了苯甲酸(BAH)在Cx4-4键合固定相上的保留行为。采用量子化学计算方法中密度泛函理论(DFT)中的B3LYP/STO-3G*基组对建立的Cx4-4与BAH相互作用的超分子构型进行了优化和频率计算,得到了超分子相互作用的稳定化能和吉布斯自由能;根据计算结果对BAH在杯芳烃固定相上的保留机理进行了研究,并进一步建立了食品中BAH在Cx4-4色谱柱上的高效液相色谱(HPLC)分离分析方法。

关键词: 杯［4］芳烃, 苯甲酸, 超分子相互作用, 固定相, 量子化学计算

Abstract: The chromatographic behaviors of benzoic acid (BAH) were investigated on a self-made p-tert-butyl-calix［4］arene-1,2-crown-4 (Cx4-4) stationary phase by changing methanol content and pH value of the mobile phase. The results show that hydrophobic interaction is the main interaction in the separation of benzoic acid, moreover, inclusion interaction, π-π and hydrogen bonding interactions also play additional roles. A Density Functional Theory (DFT) method with the base set of B3LYP/STO-3G* was employed to explain the interaction between BAH and Cx4-4, and the optimized supramolecular structure (Cx4-4 and BAH), the Gibbs free energy change (ΔG) and stabilization energy change (ΔE) were obtained. With the assistance of quantum chemistry calculation, the separation mechanism is further discussed. The quantum chemical calculation results were consistent with the retention behavior of BAH on Cx4-4 stationary phase. Finally, by using the self-made Cx4-4 column, a high performance liquid chromatographic (HPLC) method for the analysis of BAH in tuber mustard and vinegar was developed.

Key words: benzoic acid, quantum chemical calculation, stationary phase, supramolecular interaction, calix［4］arene