ABSTRACT
OBJECTIVE:To establish the quality standard of Flemingia philippinensis. METHODS:The properties and micro-scopic characteristics were observed;TLC was adopted for qualitative identification of genistin and genistein;the moisture,total ash and extract were detected;HPLC was adopted for contents determination of genistin and genistein:the column was Thermo BE-TASIL C18 with mobile phase of Acetonitrile-0.5% glacial acetic acid(gradient elution)at a flow rate of 1.0 ml/min,the detection wavelength was 261 nm,column temperature was 25℃,and the injection volume was 10μl. RESULTS:The properties and micro-scopic characteristics of F. philippinensis and F. macrophylla showed strong specificity. TLC spots of genistin and genistein we- re clear and well separated,with no interference in negative control. The moisture was 3.69%-8.37%,total ash was 1.72%-6.74%,and extract was 5.89%-19.65%. The linear range was 0.012 9-2.588 μg for genistin(r=0.999 9)and 0.004 6-0.923 2 μg for genistein (r=0.999 9);RSDs of precision,stability and reproducibility tests were lower than 3.0%;recoveries were 99.63%-101.87%(RSD=0.82%,n=6)and 97.19%-100.34%(RSD=1.23%,n=6). CONCLUSIONS:The method is simple,accurate and specif-ic,and can be used for the quality control of F. philippinensis.
ABSTRACT
Objective To study the chemical constituents in the roots of Flemingia macrophylla Methods To separate and purify compounds by column chromatography and TLC, and to determine their chemical structures by their physical characters and spectral data. Results Eleven compounds were purified from the extraction in the roots of F. macrophylla, among them four are isoflavones, three are flavanones, and one is flavanol. They are genistein (Ⅰ), orobol (Ⅱ), 5, 7, 4′-trihydroxyisoflavone-7-O-?-D-glucopyranoside (Ⅲ), 5, 7, 4′-trihydroxy-8, 3′-diprenylflavanone (Ⅳ), 5, 7, 4′-trihydroxy-6-prenylisoflavone (Ⅴ), flemichin D (Ⅵ), lespedezaflavanone A(Ⅶ), ouratea-catechin (Ⅷ), 3, 4, 5-trimethoxybenzene-O-?-D-glucopyranoside (Ⅸ), stigmasterol-3-O-?-D-glucopyranoside (Ⅹ), and stigmasterol (Ⅺ). Conclusion Compounds Ⅲ—Ⅴ, and Ⅶ—Ⅺ are found from this plant for the first time. All the compounds are found from the roots of this plant for the first time. The active components, genistein and its isoflavone analogs, are main constituents in the roots of F. macrophylla