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HPLC chromatograms of five SPE fractions at a wavelength of 254 nm. (a) SPE-0, (b) SPE-20, (c) SPE-40, (d) SPE-60, (e) SPE-80, (1) caffeic acid, (2) rutin, (3) isoquercitrin, (4) isorhamnetin 3-O-rutinoside, (5) apigenin 7-O-glucoside, (6) rosmarinic acid, (7) luteolin, and (8) formononetin.
