抑霉唑的毛细管电泳手性拆分及其在线富集

采用毛细管电泳法对抑霉唑进行手性拆分，研究了手性选择剂β-环糊精 (β-CD)、有机添加剂、NaH₂PO₄、NH₄H₂PO₄和分离电压对手性拆分的影响；同时，采用堆积法对抑霉唑进行在线富集，研究了进样压力和进样时间对在线富集的影响。结果表明:在分离电压为20 kV、β-CD浓度为5 mmol/L及缓冲体系为2.5% 异丙醇 + 75 mmol/L NaH₂PO₄ + 5 mmol/L NH₄H₂PO₄时，抑霉唑获得最佳分离度，分离度可达3.0；在分离电压为20 kV、β-CD浓度为5 mmol/L、缓冲体系为75 mmol/L NaH₂PO₄ + 5 mmol/L NH₄H₂PO₄ + 50 mmol/L H₃PO₄及进样条件为13.8 kPa × 99.9 s时获得最高富集倍数，富集倍数达91~92倍。

Enantioseparation and on-column preconcentrstion of imazalil by capillary electrophoresis

The enantioseparation of imazalil was conducted by capillary electrophoresis, and the effects of chiral selector β-cyclodextrin(β-CD), organic additives, NaH₂PO₄, NH₄H₂PO₄ and separation voltage on the resolution were studied. And the effects of the injection pressure and preconcentration times on the on-column preconcentration of imazalil were studied by the stacking method. The results showed that the best resolution was achieved under the following conditions: separation voltage 20 kV, β-CD 5 mmol/L and a buffer system of 2.5 % isopropanol + 75 mmol/L NaH₂PO₄ + 5 mmol/L NH₄H₂PO₄ . And the resolution was up to 3.0. The highest enrichment factor was obtained at the separation voltage of 20 kV using 5 mmol/L β-CD, a buffer system of 75 mmol/L NaH₂PO₄ + 5 mmol/L NH₄H₂PO₄ + 50 mmol/L H₃PO₄, and the injection conditions of 13.8 kPa×99.9 s. And the enrichment factor was up to 91-92 times.