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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Gas chromatographic profiling of ketone bodies and organic acids in diabetes.

Diabetes mellitus is a defect not only in glucose metabolism, but also in the metabolism of lipids and amino acids. Gas chromatographic and gas chromatographic--mass spectrometric profile analyses have contributed much to the understanding of the metabolic changes connected with this defect. Ketones are isolated by a gas-phase extraction and adsorption technique and profiled after thermal desorption. Organic acids are isolated by solvent extraction or anion exchange, derivatized and separated either as total acid profiles or subprofiles after pre-fractionation of the acid derivatives. The main results are as follows. (a) Increased total 4-heptanone is inherently connected with diabetes mellitus. Its urinary levels are elevated in therapeutically well controlled patients. (b) A general ketogenesis pathway leads to higher molecular weight ketone bodies in addition to the conventional ketone bodies. (c) During diabetic ketoacidosis, in addition to the fatty acids the following acids are elevated in serum and in urine: dicarboxylic acids resulting from omega- and beta-oxidation of monocarboxylic acids; oxomonocarboxylic acids as metabolites of the amino acids valine, leucine and isoleucine and as products of ketogenesis; and hydroxymonocarboxylic acids, also originating from amino acids and from ketogenesis.[1]


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