Studies on Flavonoids Extracting Methods in Different Parts of Houstonian cordata Thunb

The experiments of exacting flavonoids in different parts of Houttuynia cordata Thunb are conducted by four extraction methods(water boiled extraction method;ethanol refluent extraction method;suoshi extraction method;supersonic extraction method)to measure the flavonoids content by uv spectrum.The results show that the best extraction method is suoshi extraction method,and the order the highest to the lowest of flavonoids content in different parts of Houstonian cordata Thunb is:leaf,whole grass,slim,root.