Development of a Simple HPLC Method for Determination of Paeoniflorin-Metabolizing Activity of Intestinal Bacteria in Rat Feces.
作者:Ju-Xiu He、Teruaki Akao、Tadato Tani
DOI:10.1248/cpb.50.1233
日期:——
A simple and reproducible HPLC method for the determination of paeoniflorin (PF)-metabolizing activity of intestinal bacteria in rat feces was developed and validated. Orally administered PF, a major active constituent of Paeoniae Radix, is metabolized into a bioactive compound, paeonimetabolin I (PM-I) by intestinal bacteria. Direct determination of the PF-metabolizing rate into PM-I is hard to achieve by HPLC due to the lack of intense chromophore in PM-I. However, when PF was incubated with Lactobacillus brevis, an intestinal bacterium, in the presence of phenylmercaptan, the metabolizing rate of PF into 8-phenylthio-paeonimetabolin I (PT-PM-I) was found to be equivalent to that of PF into PM-I. Thus, the PF-metabolizing activity of intestinal bacteria in rat feces was determined by measuring the rate of biotransformation of PF into PT-PM-I, which was detected by HPLC at 255 nm. This method can be utilized in the biopharmaceutical study of traditional Chinese formulations containing Paeoniae Radix.
开发并验证了一种简单且可重复的 HPLC 方法,用于测定大鼠粪便中肠道细菌的芍药苷 (PF) 代谢活性。口服 PF 是芍药的主要活性成分,可被肠道细菌代谢为生物活性化合物——芍药代谢素 I (PM-I)。由于 PM-I 中缺乏强发色团,因此很难通过 HPLC 直接测定 PF 代谢为 PM-I 的速率。然而,当 PF 与肠道细菌短乳杆菌(Lactobacillus brevis)在苯硫醇存在下一起培养时,发现 PF 转化为 8-苯硫基-芍药代谢素 I (PT-PM-I) 的代谢率与 PF 转化为 PM 的代谢率相当。 -我。因此,通过测量 PF 生物转化为 PT-PM-I 的速率(通过 HPLC 在 255 nm 处检测)来确定大鼠粪便中肠道细菌的 PF 代谢活性。该方法可用于芍药中药制剂的生物药学研究。