Jul 01, 2008 · The viscous residue was dissolved in 100 ml of MeOH and filtered through a 0.45-mm Nylon syringe filter (Millex-HN, Ireland) before injection for HPLC analysis. High-purity ( > 99%) baicalin, wogonoside, baicalein, and wogonin (Tauto Biotech, , P. R. China) were used as standards for quant. analysis of flavonoids.
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