Identification of undescribed medium-chain acylcarnitines present in urine of patients with propionic and methylmalonic acidemias
- 作者：Libert ; Raymond ; Van Hoof ; Franç ; ois ; Thillaye ; Marc ; Vincent ; Marie-Franç ; oise ; et. al.
- 关键词：Acylcarnitines ; Propionyl-CoA carboxylase deficiency ; Methylmalonic acidemia ; FAB ; Fast Atom Bombardment ; MS/MS ; tandem mass spectrometry ; GC/MS ; gas chromatography&ndash ; mass spectrometry ; EI ; electron-impact ; MMA ; methylmalonic acidemia ; FFAP ; free fatt
- 刊名：Clinica Chimica Acta
- 出版年：2000
- 期刊代码：54_00098981
- 类别：med
- 出版时间：May, 2000
- 卷：295
- 期：1-2
- 页码：87-96
- 文件大小：273 K
摘要
In urine of patients with propionyl-CoA carboxylase deficiency or with methylmalonic acidemia, carnitine esters of 2-methyl-branched fatty acids of all chain lengths between 4 and 9 atoms of carbon were identified during the acute phase of the diseases. The chemical structure of these compounds was obtained by gas chromatography–mass spectrometry analysis of their fatty acid moieties in their free and picolinyl ester forms. We suggest mechanisms for the biosynthesis of these branched fatty acids, and their accumulation in urine during episodes of caloric imbalance.