An accurate stable isotope dilution gas chromatographic mass spectrometric approach to the diagnosis of guanidinoacetate methyltransferase deficiency

被引:71
作者
Struys, EA [1 ]
Jansen, EEW [1 ]
ten Brink, HJ [1 ]
Verhoeven, NM [1 ]
van der Knaap, MS [1 ]
Jakobs, C [1 ]
机构
[1] Free Univ Amsterdam Hosp, Dept Clin Chem & Pediat, NL-1081 HV Amsterdam, Netherlands
关键词
guanidinoacetate; C-13(2)-guanidinoacetate; GAMT-deficiency; GC-MS; stable isotope dilution; control values;
D O I
10.1016/S0731-7085(98)00280-5
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A gas chromatography-mass spectrometry (GC-MS) method is described for the quantification of guanidinoacetate in different body fluids, using a two step derivatisation procedure which involves a reaction with hexafluoroacetylacetone to form a bis(trifluoromethyl)pyrimidine ring structure followed by a reaction with pentafluorobenzyl bromide. C-13(2)-labelled guanidinoacetate is used as an internal standard. Bis(trifluoromethyl)pyrimidine pentafluorobenzyl derivatives were separated on a polar capillary GC-column and were quantified using negative chemical ionisation mass fragmentography. The detection limit of the method is 1 pmol guanidinoacetate in a 100 mu l sample. Control values were obtained for urine (53.9 +/- 25.9 mmol mol(-1) creatinine), plasma (1.08 +/- 0.31 mu mol l(-1)), cerebrospinal fluid (CSF) (0.114 +/- 0.068 mu mol l(-1)) and amniotic fluid (3.44 +/- 0.64 mu mol l(-1)). The applicability of the method is illustrated by the determination of guanidinoacetate in urine, plasma and CSF of a patient affected with guanidinoacetate methyltransferase deficiency. In all body fluids of this patient, guanidinoacetate was highly elevated. (C) 1998 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:659 / 665
页数:7
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