代谢
普罗法维尔(3,6-二氨基吖啶)具有作为鱼类抗感染剂的潜力,因此研究了其在虹鳟鱼中的代谢。在通过动脉内弹丸式注射10毫克/公斤普罗法维尔14小时后,使用反相高效液相色谱(HPLC)和262纳米的紫外检测,在肝脏和胆汁中发现了三种代谢物,在血浆中发现了一种代谢物。用盐酸处理后,三种代谢物转化为普罗法维尔,这表明代谢物是普罗法维尔的结合物。使用β-葡萄糖醛酸酶和己糖酸1,4-内酯(一种特定的β-葡萄糖醛酸酶抑制剂)的处理表明,两种代谢物是普罗法维尔的葡萄糖苷酸。为了确定紫外-可见吸收光谱和质谱,从肝脏中分离出HPLC纯化的代谢物。这些实验的数据表明,普罗法维尔的代谢物是3-N-葡萄糖苷酸普罗法维尔(PG)、3-N-葡萄糖苷酸,6-N-乙酰普罗法维尔(APG)和3-N-乙酰普罗法维尔(AP)。通过化学合成验证了代谢物的身份。当合成的PG和AP与从鳟鱼中分离出的两种代谢物进行比较时,它们通过基质辅助激光解吸离子化飞行时间质谱测定的分子量相同。此外,它们在不同的流动相条件下在HPLC中共洗脱。最后,使用肝脏亚细胞制剂的体外培养证实了这种特征,并提供了证据表明APG可以通过AP的葡萄糖苷酸化或PG的乙酰化形成。
Proflavine (3,6-diaminoacridine) has potential for use as an antiinfective in fish, and its metabolism by rainbow trout was therefore studied. Fourteen hours after intraarterial bolus administration of 10 mg/kg of proflavine, three metabolites were found in liver and bile, and one metabolite was found in plasma using reversed-phase HPLC with UV detection at 262 nm. Treatment with hydrochloric acid converted the three metabolites to proflavine, which suggested that the metabolites were proflavine conjugates. Treatment with beta-glucuronidase and saccharic acid 1,4-lactone, a specific beta-glucuronidase inhibitor, revealed that two metabolites were proflavine glucuronides. For determination of UV-VIS absorption and mass spectra, HPLC-purified metabolites were isolated from liver. Data from these experiments suggested that the proflavine metabolites were 3-N-glucuronosyl proflavine (PG), 3-N-glucuronosyl,6-N-acetyl proflavine (APG), and 3-N-acetylproflavine (AP). The identities of the metabolites were verified by chemical synthesis. When synthetic PG and AP were compared with the two metabolites isolated from trout, they had the same molecular weight as determined by matrix-assisted, laser desorption ionization, time-of-flight MS. In addition, they coeluted on HPLC under different mobile phase conditions. Finally, the in vitro incubation with liver subcellular preparations confirmed this characterization and provided the evidence that APG can be formed by glucuronidation of AP or acetylation of PG.
来源:Hazardous Substances Data Bank (HSDB)