Identification of new metabolites of ifosfamide in rat urine using ion cluster technique
作者:Jeff J.-H. Wang、Kenneth K. Chan
DOI:10.1002/jms.1190300504
日期:1995.5
Metabolism of the anticancer drug ifosfamide was investigated in Sprague-Dawley rats. Along with four known metabolites, namely N2-dechloroethylifosfamide, N3-dechloroethylifosfamide, alcoifosfamide and isophosphoramide mustard, four new urinary metabolites were identified utilizing combined techniques of chemical modification/derivatization, capillary gas chromatography/chemical ionization mass spectrometry (ammonia), deuterium-labeling/ion cluster analysis and chemical synthesis. Secondary metabolites of N2-dechloroethyl and N3-dechloroethylifosfamide formed by 4-hydroxylation, i.e. 4-hydroxy-N2-dechloroethylifosfamide and 4-hydroxy-N3-dechloroethylifosfamide, respectively, and their subsequent decomposition product, N-dechloroethyliso-phosphoramide mustard, were identified. Secondary dealkylation pathways of N2-dechloroethylifosfamide and/or N3-dechloroethylifosfamide were also demonstrated through characterization of N2,3-didechloroethyl ifosfamide. The key active metabolite of ifosfamide, 4-hydroxyifosfamide, was characterized as a cyanohydrin adduct for the first time.
在 Sprague-Dawley 大鼠中研究了抗癌药物异环磷酰胺的代谢。除了四种已知的代谢物,即 N2-脱氯乙基异环磷酰胺、N3-脱氯乙基异环磷酰胺、乙醇异环磷酰胺和异磷酰胺芥末,利用化学修饰/衍生化、毛细管气相色谱/化学电离质谱(氨)、氘标记的组合技术鉴定了四种新的尿液代谢物。 /离子簇分析和化学合成。鉴定了通过 4-羟基化形成的 N2-脱氯乙基和 N3-脱氯乙基异磷酰胺的次级代谢物,分别为 4-羟基-N2-脱氯乙基异磷酰胺和 4-羟基-N3-脱氯乙基异磷酰胺,及其随后的分解产物 N-脱氯乙基异磷酰胺芥子。 N2-脱氯乙基异环磷酰胺和/或N3-脱氯乙基异环磷酰胺的二级脱烷基化途径也通过N2,3-二脱氯乙基异环磷酰胺的表征得到证实。异环磷酰胺的关键活性代谢物 4-羟基异环磷酰胺首次被表征为氰醇加合物。