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- W2393087967 abstract "Two major components(peaks 1,2)in the extract of Cephalotaxus sinensis(Rehd et Wile)Li broke up during drying,which was investigated by techniques of high-performance liquid chromatography with photodiode array detection(HPLC-DAD) and high-performance liquid chromatography-electrospray ionization tandem mass spectrometry(HPLC-MS).The two components decreased by 20.2%,45.6%,respectively,after drying in vacuo,and they were not observed after drying under atmospheric pressure.The area of peak 3 increased by 1.90-and 5.74-fold,respectively,after drying in vacuo and under atmospheric pressure.It is inferred that the three peaks are flavones having two characteristic UV absorbance bands(240~280 nm and 300~400 nm) of flavones,and peaks 1~2 produce peak 3 by bond cleavage during drying.The extract was subjected successively to column chromatography on AB-8 macroporous absorbent resin,Sephadex LH-20 and reversephase silica gel(ODS) to afford three compounds.They are identified as apigenin-5-O-[α-L-rhamnopyranosyl-(1→4)-β-D-glucopyranoside](peak 1),apigenin-5-O-[α-L-rhamnopyranosyl-(1→4)-6-O-β-D-acetylglucopyranoside](peak 2) and apigenin(peak 3) by IR and NMR analysis,and the two flavone glycosides(peaks 1,2) produce apigenin,the aglycone,after drying." @default.
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- W2393087967 date "2007-01-01" @default.
- W2393087967 modified "2023-09-26" @default.
- W2393087967 title "Effect of Drying on the Chemical Constituents of Cephalotaxus Sinensis Extract by HPLC-DAD and HPLC-MS" @default.
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