AIM: To confirm the optimum extraction of the total-saponins from Patrinia Villosa Juss. METHODS: Optimum conditions(ethanol concentration,extraction hours,ethanol solution quantity) were determined by the uniform design test,the extract was refined with macropore resin AB-8,and samples were measured colorimetrically at ?=560 nm compared with oleanolic acid as reference substance. RESULTS: The result was 95% ethanol as solvent, extraction time for 1 h adding 8 times amount of ethanol solution at 100 ℃ water bath for two times.under this condition,the total-saponins content was 0.668%,in accordance with the design forecast. CONCLUSION: The optimum extraction technique and purified methods could extract the total-saponins efficiently from Patrinia Villosa Juss.The technique is simple and adapts for production.

OBJECTIVE:To establish a method for determination of trace platinum in zolpidem tartrate. METHODS:Graphite furnace atomic absorption spectrometry(GFAAS)was adopted for direct determination after dissolving sample in 1% Hydrochloric acid solution. Horizontal platform graphite tube was performed with detection wavelength of 244.79 nm,slit width of 0.2 nm and current intensity of hollow cathode lamp of 6 mA. The mode of background correction was zeeman effect,the peak height was used as measurement pattern,and the injection volume was 20 μl. RESULTS:The linear range of platinum was 0-100 ng/ml(r=0.999 0);RSDs of precision and reproducibility tests were no more than 2.0%;recovery was 97.78%-103.07%(RSD=1.6%,n=9);the detection limit was 1.48 ng/ml. CONCLUSIONS:This method is simple and rapid with good precision and accuracy,and can be applied for the determination of trace platinum in zolpidem tartrate.