Measurement of dimethylglycine in biological fluids.

Porter DH, Lin M, Wagner C
Anal Biochem. 1985 151 (2): 299-303

PMID: 2420226 · DOI:10.1016/0003-2697(85)90179-4

The method of quantitating N,N-dimethylglycine involves cation-exchange high-performance liquid chromatography and detection of dimethylglycine with dimethylglycine dehydrogenase. Dimethylglycine was added to plasma and urine and samples were assayed for dimethylglycine. Plasma and urine to which no dimethylglycine was added were also assayed. Recoveries of added dimethylglycine were 99 to 104% with no endogenous dimethylglycine found in rat plasma or normal human urine. The human plasma used contained a small amount of endogenous dimethylglycine. The cation-exchange chromatography separates dimethylglycine from other compounds which can serve as substrates for dimethylglycine dehydrogenase. Repeatability of the assay is +/- 10%. Using this method we have identified dimethylglycine in the urine of a 1-month-old female human patient.

MeSH Terms (10)

Carbon Radioisotopes Chromatography, High Pressure Liquid Dimethylglycine Dehydrogenase Glycine Humans Mitochondrial Proteins Oxidoreductases, N-Demethylating Radioisotope Dilution Technique Sarcosine Substrate Specificity

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