Chemical Constituents in n-butanol Extract from the Seeds of Alpinia katsumadai
AIM:To study the chemical constituents in n-butanol extract from seeds of Alpinia katsumadai Hayata..METHODS:Various chromatographic methods were applied to isolate pure compounds and their structures were elucidated by spectroscopic methods.RESULTS:Ten compounds were isolated and their structures were identified as quercetin 3-O-(2,6-di-O-rhamnopyranosylgalactopyranoside) (1),isorhamnetin 3-0-(2,6-di-O-rhamnopyranosylgalactopyranoside) (2),pinocembrin-3,7-di-β-D-glucoside (3),quercetin 3-O-robinobioside (4),catechin (5),adenosine (6),uracil (7),nicotinic acid (8),hypoxanthine (9) and adenine (10).CONCLUSION:All compounds are firstly isolated from this plant and compounds 1-4,6-10 were isolated from the genus Alpinia Roxb.for the first time.
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