Phenolic compounds isolated from rhizoma of Aster tataricus / 中国中药杂志

<p><b>OBJECTIVE</b>To study the chemical constituents in root and rhizome of Aster tataricus.</p><p><b>METHODS</b>Compounds were isolated and purified by silica gel and sephadex LH-20 column chromatography. Their structures were identified by physicochemical properties and spectral analysis.</p><p><b>RESULT</b>Nine compounds were isolated and identified as quercetin (I), kaemferol (II), emodin (III), chrysophanol (IV), physcion (V), benzoic acid (VI), p-hydroxy-bezoic acid (VII), E-caffeic acid (VIII), E-ferulic acid hexacosyl ester (IX).</p><p><b>CONCLUSION</b>Compounds IV, V, VI, VII, VIII, IX were isolated from A. tataricus for the first time.</p>

Determination of calycosin-7-O-beta-D-glucopyranoside in radix astragali by HPLC / 中国中药杂志

<p><b>OBJECTIVE</b>TO establish a RP-HPLC method for the determination of calycosin-7-O-beta-D-glucopyranoside in Radix Astragali, and to analyse the calycosin-7-O-beta-D-glucopyranoside content of ten samples of Radix Astragali, collected from different regions.</p><p><b>METHOD</b>A Polaris C18(250 mm x 4.6 mm, 5 microns) column was used and a mixture of methanol-water (30:70) was used as the mobile phase at a flow rate of 1.0 mL.min-1. The column temperature was 25 degrees C and the UV detection wavelength was 254 nm.</p><p><b>RESULT</b>The calibration curve was in good linearity over the range of 0.0106-2.12 micrograms with the regression equation Y = 3035. 97 X - 14.85(r = 0.9999). The average recovery was 95.8% (n = 5, RSD = 1.3%).</p><p><b>CONCLUSION</b>The method is simple, quick, sensitive and reproducible. In all of the samples, the calycosin-7-O-beta-D-glucopyranoside contents differ markedly.</p>