Direct Enantiomeric Separation and Determination of Hexythiazox Enantiomers in Environment and Vegetable by Reverse-Phase High-Performance Liquid Chromatography

文献类型： 外文期刊

第一作者： Zhang, Ping

作者： Zhang, Ping;Wang, Sheng;Shi, Dongmei;Xu, Yangyang;Yang, Furong;He, Yuhan;He, Lin;Zhang, Ping;Wang, Sheng;Shi, Dongmei;Xu, Yangyang;Yang, Furong;He, Yuhan;He, Lin;Zhang, Ping;He, Lin;Deng, Xile

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关键词： hexythiazox; enantiomeric separation; residue analysis; vegetable; environment

期刊名称：INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH （ 影响因子：3.39； 五年影响因子：3.789 ）

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年卷期： 2020 年 17 卷 10 期

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收录情况： SCI

摘要： In the present study, the direct enantiomeric separation of hexythiazox enantiomers on Lux cellulose-1, Lux cellulose-2, Lux cellulose-3, Lux cellulose-4, Lux amylose-1 and Chirapak IC chiral columns were carefully investigated by reverse-phase high-performance liquid chromatography (RP-HPLC). Acetonitrile/water and methanol/water were used as mobile phase at a flow rate of 0.8 mL.min(-1). The effects of chiral stationary phase, temperature, thermodynamic parameters, mobile phase component and mobile phase ratio on hexythiazox enantiomers separation were fully evaluated. Hexythiazox enantiomers received a baseline separation on the Lux cellulose-3 column with a maximum resolution of R-s = 2.09 (methanol/water) and R-s = 2.74 (acetonitrile/water), respectively. Partial separations were achieved on other five chiral columns. Furthermore, Lux amylose-1 and Chirapak IC had no separation ability for hexythiazox enantiomers when methanol/water was used as mobile phase. Temperature study indicated that the capacity factor (k) and resolution factor (R-s) decreased with column temperature increasing from 10 degrees C to 40 degrees C. The enthalpy (Delta H) and entropy (Delta S) involved in hexythiazox separation were also calculated and demonstrated the lower temperature contributed to better separation resolution. Moreover, the residue analytical method for hexythiazox enantiomers in the environment (soil and water) and vegetable (cucumber, cabbage and tomato) were also established with reliable accuracy and precision under reverse-phase HPLC condition. Such results provided a baseline separation method for hexythiazox enantiomers under reverse-phase conditions and contributed to an environmental and health risk assessment of hexythiazox at enantiomer level.

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