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首页> 外文期刊>Electrophoresis: The Official Journal of the International Electrophoresis Society >STEREOSELECTIVE ANALYSIS OF HERBICIDES BY CAPILLARY ELECTROPHORESIS USING SULFOBUTYL ETHER BETA-CYCLODEXTRIN AS CHIRAL SELECTOR
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STEREOSELECTIVE ANALYSIS OF HERBICIDES BY CAPILLARY ELECTROPHORESIS USING SULFOBUTYL ETHER BETA-CYCLODEXTRIN AS CHIRAL SELECTOR

机译：巯基醚β-环糊精作为手性选择剂通过毛细管电泳对除草剂进行立体选择性分析

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Capillary zone electrophoresis has been used for the enantiomeric separation of several herbicides. Different beta-cyclodextrin (CD) derivatives have been investigated for chiral separations and among them the negatively charged sulfobutyl ether beta-cyclodextrin (SBE-beta-CD) proved to be effective for the stereoselective resolutions of the investigated herbicides. The effect of CD concentration, buffer pH and organic modifier on effective mobilities, resolution and selectivity of the analytes have been studied. Addition of SBE-beta-CD (5-50 mg/mL) to the buffer at pH 9 resulted in a general increase of migration times as well as resolution. A CD concentration as low as 5 mg/mL was effective to completely resolve napropamide and ethofumesate enantiomers. Buffer solutions containing 40 mg/mL of SBE-beta-CD were chosen to study the effect of buffer pH (7, 8, and 9) on chiral separation of the herbicides. No great differences in resolution and effective mobilities have been found in the pH 7-9 range. The addition of different organic modifiers to the background electrolyte at pH 9, containing 20 mg/mL of SBE-beta-CD, showed different effects. Methanol was the most effective in improving resolution but in some cases total loss in enantiomeric separation was observed. The qualitative analysis of an enantiomerically pure herbicide (flamprop isopropyl) commercial preparation is also shown. [References: 22]
机译：毛细管区带电泳已用于几种除草剂的对映体分离。已经研究了不同的β-环糊精（CD）衍生物用于手性分离，其中带负电荷的磺丁基醚β-环糊精（SBE-β-CD）被证明对于所研究的除草剂的立体选择性拆分有效。已经研究了CD浓度，缓冲液pH和有机改性剂对分析物的有效迁移率，分离度和选择性的影响。在pH 9的缓冲液中添加SBE-β-CD（5-50 mg / mL），导致迁移时间和分离度普遍增加。低至5 mg / mL的CD浓度可以有效地完全分解萘丙酰胺和依托美酸酯对映体。选择含有40 mg / mLSBE-β-CD的缓冲溶液以研究缓冲液pH（7、8和9）对除草剂的手性分离的影响。在pH 7-9范围内，分离度和有效迁移率没有太大差异。在pH值为9的背景电解质中添加不同的有机改性剂（包含20 mg / mL的SBE-β-CD）显示出不同的效果。甲醇是提高分离度最有效的方法，但在某些情况下，观察到对映体分离的总损失。还显示了对映体纯除草剂（异丙草铵）的定性分析。 [参考：22]

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