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Separation of phenolic acids after the acid hydrolysis of methanolic extract in HPLC. Stationary phase—RP-18; mobile phase: water: methanol: formic acid (75:25:0.5 v/v). (1)—protocatechuic acid (3,4-dihydroxybenzoic); (2)—caffeic acid (3,4-dihydroxycinnamic); (3)—p-coumaric acid (4-hydroxycinamic). Wavelength 254 nm.
