The EtOH fraction was concentrated and loaded on a Sephadex LH 20 column eluted with 0.5 L of H 2O to obtain 15 fractions, which were detected by sili...

• 结论:黄芩苷苷元是主要药物代谢产物的中间体,他们在体内共存,构成黄芩苷的药效。