AIM To develop a new determination method of astrogaloside in anisic acid sulfuric acid system by spectrophotofluorimetry. METHODS Using 2% anisic acid anhydrous alcoholic solution as colour developing reagent in the presence of sulfuric acid to determine astragaloside in pig serum. The reaction was allowed to procced on a 60℃ water bath for 20 min. RESULTS The reaction product of astrogaloside and anisic acid has excitation and emission maxima at 320 and 387 nm, respectively. The linear range of determination is from 0 2 to 40 μg·mL -1 . The detection limit is 0 02 μg·mL -1 . The recoveries of samples are between 98 65% and 102 4%. CONCLUSION The proposed method has advantages of high sensitivity, low detection limit and no interference. It has been used to determine several kinds of samples successfully.
A gradient HPLC method was established for the determination of harpagoside and cinnamic acid in Radix Scrophulariae (Xuanshen) and a proposition was put forward for the lowest content of the characteristic and active constituent (harpagoside) for qualified Radix Scrophulariae. The experimental conditions were as follows: Ultrasphere ODS column (250 mm 4.6 mm, 5 mm), mobile phase: acetonitrile-water (containing 1.0% acetic acid) (20:8050:50) (20 min), flow-rate 1 mLmin-1, room temperature, detection wavelength 278 nm. Twenty-eight samples of Xuan-shen (Radix Scrophulariae) from different districts of China were analyzed and the contents of harpagoside and cinnamic acid in Xuan-shen were 0.041~0.244% and 0.012~0.068% respectively. The recoveries (RSD)% were 97.13(0.80)% for harpagoside and 99.38(0.51)% for cinnamic acid. The method is simple and accurate. It can be used for the quality control of Radix Scrophulariae. We propose that the content of harpagoside in qualified Radix Scrophularia should be no less than 0.05%.
