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Journal of Lipid Research, Vol 26, 387-392, Copyright © 1985 by Lipid Research, Inc.

ARTICLES

Quantification of retinoic acid by gas-liquid chromatography-mass spectrometry: total versus all-trans-retinoic acid in human plasma

JL Napoli, BC Pramanik, JB Williams, MI Dawson and PD Hobbs

An assay based on negative ion chemical ionization mass spectrometry has been developed to quantify retinoic acid in plasma or serum. The lower limit of detection is 75 pg (240 fmol); normal values of retinoic acid can be determined on as little as 40 microliters of human plasma. The plasma concentrations of total retinoic acid in 12 healthy male volunteers taking no medication or vitamin supplementation ranged from 2.8 to 6.6 ng/ml; the mean was 4.9 ng/ml. The assay can be manipulated to measure all-trans-retinoic acid alone; about 75% of retinoic acid in human plasma or rat serum is all-trans-retinoic acid. Both retinol and retinoic acid can be quantified on the same 0.1-ml sample; the concentration of retinoic acid in human plasma or rat serum is at least 150-fold less than that of retinol.
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