Simultaneous chiral separation of three triazole pesticide enantiomers with submicron C18 bonded silica stationary phase by pressurized capillary electrochromatography

: A monodispersed C18 silica stationary phase with particle size of 420 nm was prepared by modified St ber method.The column packed with submicron C18 bonded silica was successfully used for simultaneous enantioseparation of three chiral triazole pesticides by pressurized capillary electrochromatography (pCEC).Some effects on separation were investigated, and the optimized conditions were as follows:mobile phase of acetonitrile and 20 mmol/L phosphate buffer (pH=6.8) containing 20 mmol/L (2-hydroxypropyl)-γ-cyclodextrin (HP-γ-CD)(45:55, v/v), flow rate of 0.04 mL/min and applied voltage of-9.4 kV, the detection wavelength at 220 nm.The resolutions of adjacent peaks of uniconazole, diniconazole and propiconazole enantiomers were 4.20, 12.9, 4.41, 4.09 and 1.70 in 12 min, respectively, with the column efficiency up to 310000 plates/m.This study provides an alternative way for the simultaneous separation of chiral triazole pesticides with high efficiency.