Yang S, Minkler P, Hoppel C. cis-3,4-Methylene-heptanoylcarnitine: characterization and verification of the C8:1 acylcarnitine in human urine.
J Chromatogr B Analyt Technol Biomed Life Sci 2007;
857:251-8. [PMID:
17692580 DOI:
10.1016/j.jchromb.2007.07.027]
[Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2007] [Revised: 06/13/2007] [Accepted: 07/19/2007] [Indexed: 12/30/2022]
Abstract
Acylcarnitine profiles have been used to diagnose specific inherited metabolic diseases. For some acylcarnitines, however, the detailed structure of their acyl group remains a question. One such incompletely characterized acylcarnitine is cis-3,4-methylene-heptanoylcarnitine. To investigate this problem, we isolated the "C8:1" acylcarnitine from human urine, transesterified it to form its acyl picolinyl ester, and characterized it by GC/EI-MS. These results were compared to GC/EI-MS results from authentic standards we synthesized (cis-3,4-methylene-heptanoylcarnitine, trans-2-octenoylcarnitine, 3-octenoylcarnitine, cis-4-octenoylcarnitine, and trans-4-octenoylcarnitine). Only cis-3,4-methylene-heptanoylcarnitine matched the urinary "C8:1" acylcarnitine. The standards were then spiked in human urine, converted to pentafluorophenacyl esters, and detected by HPLC/MS. cis-3,4-Methylene-heptanoylcarnitine exactly matched the "C8:1" acylcarnitine in urine, whereas none of the other C8:1 acylcarnitine standards matched. Based on the data from GC/EI-MS and HPLC/MS, the "C8:1" acylcarnitine in human urine is shown to be cis-3,4-methylene-heptanoylcarnitine.
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