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HPLC chromatograms of a standard mixture containing apigenin, apigenin-7-glucoside, luteolin, and luteolin-7-glucoside and EESP. The chromatograms of apigenin, apigenin-7-glucoside, luteolin, and luteolin-7-glucoside in a standard mixture (A) and in EESP (B) were detected at a UV wavelength of 254 nm.
