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Extinction coefficient spectra of 40 µm solutions (phosphate buffer, pH 6·8) of hydroxycinnamates (A) and flavonoid glycosides (B) with the addition (continuous lines) or without the addition (dotted lines) of 200 µm 2-amino ethyl diphenyl boric acid (NR). api 7-O-rut, Apigenin 7-O-rutinoside; lut 7-O-glc, luteolin 7-O-glucoside; que 3-O-rut, quercetin 3-O-rutinoside.
