flavonoidsThe HPLC separation was performed on Eclipse XDB C18 column(50 mm × 2.1 mm, 1.8 m, Agilent Company, USA). Mobile phaseconsisted of two solvents, (A) methanol and (B) 0.2% formic acid.Separation of compounds was carried out with gradient elutionprofile: 0 min, A: B 10:90; 36 min, A: B 70:30; 50 min, A: B 100:0;60 min. Chromatography was performed at 30◦C with a flow-rateof 0.8 ml/min. UV traces were measured at 254, 360 and UV spectra(DAD) were recorded between 190 and 900 nm.