Quantification of carnitine and specific acylcarnitines by high-performance liquid chromatography: application to normal human urine and urine from patients with methylmalonic aciduria, isovaleric acidemia or medium-chain acyl-CoA dehydrogenase deficiency.
This paper describes the development of a high-performance liquid chromatographic method for the quantitation of free carnitine, total carnitine, acetylcarnitine, propionylcarnitine, isovalerylcarnitine, hexanoylcarnitine and octanoylcarnitine in human urine. Carnitine and acylcarnitines were isolated from 10 or 25 microliters of urine using 0.5-ml columns of silica gel, derivatized with 4'-bromophenacyl trifluoromethanesulfonate and separated by high-performance liquid chromatography. Using 4-(N,N-dimethyl-N-ethylammonio)-3-hydroxybutanoate ("e-carnitine") as the internal standard, standard curves (10-300 nmol/ml) were generated. Carnitine and acylcarnitines were quantified (when they were present) in normal human urine and the urine of patients diagnosed with one of three different disorders of organic acid metabolism: methylmalonic aciduria, isovaleric aciduria, isovaleric acidemia, and medium-chain acyl-CoA dehydrogenase deficiency.
Minkler
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PE
Medical Research Service, Department of Veterans Affairs Medical Center, Cleveland, OH 44106.
Hoppel
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CL
D000098:Acetophenones; D042964:Acyl-CoA Dehydrogenase; D044944:Acyl-CoA Dehydrogenases / Q000172:deficiency*; D000592:Amino Acid Metabolism, Inborn Errors / Q000652:urine*; D002331:Carnitine / Q000031:analogs & derivatives / Q000652:urine*; D002675:Child, Preschool; D002851:Chromatography, High Pressure Liquid; D005260:Female; D045782:Hemiterpenes; D006801:Humans; D007202:Indicators and Reagents; D007223:Infant; D008764:Methylmalonic Acid / Q000652:urine*; D010421:Pentanoic Acids / Q000097:blood*
D000098:Acetophenones; D045782:Hemiterpenes; D007202:Indicators and Reagents; D010421:Pentanoic Acids; C008216:isovaleric acid; D008764:Methylmalonic Acid; C043597:4'-bromophenacyl triflate; D044944:Acyl-CoA Dehydrogenases; D042964:Acyl-CoA Dehydrogenase; D002331:Carnitine