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龙胆(Gentiana scabra Bunge)或其同属植物的根茎及根中含有苦味成分龙胆苦甙(Gentiopicroside或Gentiopicrin) 龙胆苦甙的甲醇溶液在270毫微米处有最大吸收。在50微克/毫升以下符合比尔定律。定量法:精密秤取在40°下干燥至恒重的龙胆粉末约2克,加甲醇200毫升,在常温
Gentiana scabra Bunge or its genus rhizome and root contains a bitter component gentiopicroside (Gentiopicroside Gentiopicrin) gentiopicroside methanol solution maximum absorption at 270 nm. Beer’s law is obeyed below 50 μg / ml. Quantitative method: Precision scale to take at 40 ° to dry constant weight of gentian powder about 2 grams, add 200 ml of methanol at room temperature