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Chromatogram of a sample with added internal standard. Blue signal DAD = 280 nm, red signal DAD = 360 nm, green signal FLD Ex = 230 nm and Em = 280 nm. Peaks identified and quantified by HPLC 1: (+)-catechin; 2: (−)-epicatechin; 3: isorhamnetin-3-O-glucoside; 4: kaempferol-3-O-rutinoside; 5: isorhamnetin-3-O-rutinoside; IS: daidzein.
