Ionic liquid （1-ethyl-3-methylimidazolium tetrafluoroborate, 1E-3MI-TFB） and HP-β- CD as modifier was added to the buffer to separate hyperoside, luteolin and chlorogenic acid. Experiments explored the effect of concentration of 1E-3MI-TFB and HP-β-CD on separation. The results indicated that 1.0 mmol/L HP-β-CD and 1%0 （v/v） 1E-3MI-TFB added to the buffer simultaneously could achieve a good compromise of resolution and analysis time. Capillary experiments and UV spectra indicated that there was interaction between 1E-3MI-TFB and analytes.
A method was developed to quickly determine genistin, genistein, kaempferol and rutin in Fructus sophorae by β -CDmodified capillary zone electrophoresis. Based on the investigation of the effects of buffer pH and concentration, β -CD concentration,SDS concentration, capillary temperature, the analytical conditions were optimized. Under the optimized conditions, the three analytes were well separated in less than 6 min. A good linear relationship between the peak area and concentration was found in the 2 ～ 400g/mL,2 ～ 300g/mL 2 ～ 200g/mL and 5 ～ 500g/mL concentration range for genistin, genistein, kaempferol and rutin, respectively. The detection limits were 0.8g/mL, 0.6g/mL, 0.6g/mL and 1.4g/mL for genistin, genistein, kaempferol and rutin, respectively.
