HPLC chromatograms of SbE, SbF1, SbF2 and SbF3 recorded at 280 nm (A), and percentage content of flavonoids in SbE and three fractions (B). Flavonoid peaks: (1) scutellarin, (2) baicalin, (3) baicalein, (4) wogonin. Peak numbers are not shown if flavonoids were not detected.