A new flavonone from seeds of Alpinia katsumadai and its neuroprotective effect on PC12 cells Isolation and purification of alpinetin and cardamomin from Alpinia katsumadai by high speed counter-current chromatography Isolation and purification of alpinetin and cardamomin from Alpinia katsumadai by high speed counter-current chromatography Herbalogical Study on Traditional Chinese Drugs Caodoukon and Baidoukou