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Quantification of arabinitol in serum by selected ion monitoring as a diagnostic technique in invasive candidiasis



Quantification of arabinitol in serum by selected ion monitoring as a diagnostic technique in invasive candidiasis



Journal of Clinical Microbiology 12(4): 594-601



D-Arabinitol was identified by mass spectrometry as a metabolite of Candida albicans and Candida tropicalis. For quantification, serum was deproteinized with acetone, the supernatant was evaporated to dryness, the silyl derivative was formed, and a portion was injected into a combined gas chromatograph-mass spectrometer system. Erythritol or 2-deoxy-galactitol was the internal standard. The protonated molecular ions, obtained in chemical ionization with isobutane, were monitored. For 39 normal subjects the mean endogenous arabinitol concentration was 0.52 microgram/ml (standard deviation, +/- 0.34). An increment of 0.2 microgram of arabinitol per ml could be quantified. Of 11 cases with diagnosed invasive candidiasis, 9 had arabinitol levels > 1.2 microgram/ml (8 microM) in the range of 1.2 to 25.0 micrograms/ml; the remaining 2 cases had levels in the normal range. Six cases of diagnosed colonized candidiasis showed normal arabinitol levels.

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Accession: 000962298

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PMID: 6999025


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