Objective To study the HPLC fingerprints of isoflavones from different medicinal plants of G.max and establish a sensitive and specific method for controlling the quality of the soybean isoflavone.Methods The gradient elution mode was applied in chromatographic separation.A C_(18) column(250 mm?4.6 mm,5 ?m) was used with the mobile phase: ice acetic acid water solution(pH value 3.2)-methanol,flow rate: 0.6 mL/min,detecting wavelength: 261 nm,and the column temperature: room temperature.All 25 samples collected from different species were determined.The clustering analysis and the software of similarity analysis were applied for datum analysis.Results This method had a good repeatability and reproducibility.The ratio of peaks′ area from distinct samples were different.Conclusion The method can show the difference of chemical compositions among species completely and can be used as a quality control method for soybean.

Objective To establish a method for the quality control of Rhizoma Alismatis. Methods The samples of Rhizoma Alismatis were identified with TLC and the content of alisol B-23-acetate in Rhizoma Alismatis was determined by HPLC-ELSD. Results The spots of TLC chromatogram of Rhizoma Alismatis was clear. A good linearity was in the range of 4.4～110.0 ?g/mL of alisol B-23-acetate, r=0.999 2(n=5), and the average recovery rate was 98.98 %(n=9), RSD=1.3 %. Conclusion This method was simple, accurate and with a good reproducibility and can be used for the quality control of Rhizoma Alismatis.