Phenylbutyrate is used in humans for treating inborn errors of ureagenesis, certain forms of cancer, cystic fibrosis and thalassemia. The known metabolism of phenylbutyrate leads to phenylacetylglutamine, which is excreted in urine. We have identified phenylbutyrylglutamine as a new metabolite of phenylbutyrate in human plasma and urine. We describe the synthesis of phenylbutyrylglutamine and its assay by gas chromatography/mass spectrometry as a tert-butyldimethylsilyl or methyl derivative, using standards of [2H5]phenylbutyrylglutamine and phenylpropionylglutamine. After administration of phenylbutyrate to normal humans, the cumulative urinary excretion of phenylacetate, phenylbutyrate, phenylacetylglutamine and phenylbutyrylglutamine amounts to about half of the dose of phenylbutyrate. Thus, additional metabolites of phenylbutyrate are yet to be identified. Copyright © 2002 John Wiley & Sons, Ltd.
苯
丁酸盐用于治疗人类先天性尿生成错误、某些形式的癌症、囊性纤维化和地中海贫血症。苯
丁酸盐的已知代谢过程会产生苯乙酰谷
氨酰胺,并随尿液排出体外。我们在人体血浆和尿液中发现了苯
丁酸的新代谢产物苯乙酰谷
氨酰胺。我们介绍了苯丁酰谷
氨酰胺的合成方法,并使用[2H5]苯丁酰谷
氨酰胺和苯丙酰谷
氨酰胺标准品,通过气相色谱/质谱法检测了其叔丁基二甲基
硅烷或甲基衍
生物。正常人服用苯
丁酸盐后,尿液中
苯乙酸盐、苯
丁酸盐、苯乙酰谷
氨酰胺和苯丁酰谷
氨酰胺的累积排泄量约为苯
丁酸盐剂量的一半。因此,苯
丁酸盐的其他代谢物还有待鉴定。Copyright © 2002 John Wiley & Sons, Ltd. All Rights Reserved.