Study on pharmacokinetics of asperosaponin VI and its active metabolite in rats Determination of plasma protein binding rate of methyl protodioscin with ultrafiltration Determination of plasma protein binding rate of bufalin Correlation study on in vivo pharmacokinetics and anti-oxidation of Guhong Injection in cerebral ischemia reperfusion injury model of rats Determination of plasma protein binding rate of arctiin and arctigenin with ultrafiltration Determination of plasma protein binding rate of bufalin Determination of glaucocalyxin A by HPLC and its protein binding rate in plasma of rat Determination and comparison of plasma protein binding rate of alkaloids from seed of Strychnou nux-vomica