Study on the chemical constituents of phenolic acids from Potentilla discolor

OBJECTIVE To study the phenolic acids constituents in Potentilla discolor.METHODS The compounds were isolated by silica gel chromatography,macroporous resins and polyamide column chromatography from the 70% ethanol extract,and their structures were identified by spectroscopy.RESULTS Six compounds were isolated from Potentilla discolor and their structures were identified as 3-methylellagic acid-4′-O-α-L-rhamnopyranoside(I),3,3′,4-trimethylellagic acid-4′-O-β-D-glucopyranoside(Ⅱ),3,3′-dimethylellagic acid(Ⅲ),gallic acid(Ⅳ),tormentic acid(Ⅴ)and kaempferol-3-O-β-D-6-O-(p-hydroxycinnamoyl)-gluco pyranoside(VI).CONCLUSION The Compounds Ⅱ,Ⅲ,Ⅴ,Ⅵ were isolated from this herb for the first time.