Capillary gas-liquid chromatographic/mass spectrometric measurement of plasma acetate content and (2-13C) acetate enrichment

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Abstract
In studies where (2-13C)acetate is employed as isotopic tracer in vivo, we have reported a selected ion monitoring gas-liquid chromatographic/mass spectrometric method which allows plasma tracer enrichment as well as plasma acetate content to be determined in the same 200-500 .mu.l sample through the use of methacrylic acid as the assay internal standard. For standard solutions in the range equivalent to plasma acetic acid concentrations of 10-200 .mu.M, assay precision was .+-.4.3%. For plasma samples in the physiological range (approximately 20-300 .mu.M acetate) assay precision averaged better than .+-.5%. The use of the method is illustrated by measuring acetate turnover in a young adult.