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Clinical Chemistry 41: 1467-1474, 1995;
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Clinical Chemistry, Vol 41, 1467-1474, Copyright © 1995 by American Association for Clinical Chemistry

Identification and quantification of intermediates of unsaturated fatty acid metabolism in plasma of patients with fatty acid oxidation disorders

W Onkenhout, V Venizelos, PF van der Poel, MP van den Heuvel and BJ Poorthuis
Department of Pediatrics, University Hospital, Leiden, The Netherlands.

The free fatty acid and total fatty acid profiles in plasma of nine patients with medium-chain acyl-CoA dehydrogenase (MCAD) deficiency, two with very-long-chain acyl-CoA dehydrogenase (VLCAD) deficiency and two with mild-type multiple acyl-CoA dehydrogenase (MAD-m) deficiency, were analyzed by gas chromatography-mass spectrometry. In the plasma of patients with MCAD deficiency we found increases of octanoic acid (8:0), decanoic acid (10:0), 4-decenoic acid (10:1 omega 6), and 4,7- decadienoic acid (10:2 omega 3), all present almost exclusively in free form. The patients with VLCAD deficiency showed increases of mainly 5- tetradecenoic acid (14:1 omega 9) and to a minor extent 5-dodecenoic acid (12:1 omega 7), 5,8-tetradecadienoic acid (14:2 omega 6), and 7,10- hexadecadienoic acid (16:2 omega 6), in both the free and esterified fatty acid fraction. The MAD-m patients showed variable increases of all the unusual fatty acids present in MCAD- and VLCAD-deficient plasma. The 14:1 omega 9, 14:2 omega 6, and 16:2 omega 6 fatty acids were present mainly in the esterified form. Measurement of these fatty acids in plasma by the relatively simple method presented here provides a sensitive and specific aid in the diagnosis of acyl-CoA dehydrogenase deficiency disorders.


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