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Experimental Diabetes Research
Volume 2012, Article ID 234812, 10 pages
http://dx.doi.org/10.1155/2012/234812
Research Article

L(+) and D(-) Lactate Are Increased in Plasma and Urine Samples of Type 2 Diabetes as Measured by a Simultaneous Quantification of L(+) and D(-) Lactate by Reversed-Phase Liquid Chromatography Tandem Mass Spectrometry

1Laboratory for Metabolism and Vascular Medicine, Department of Internal Medicine, Maastricht University, P. Debeyelaan 25, P.O. Box 5800, 6202 AZ Maastricht, The Netherlands
2Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, The Netherlands
3Division of Gastroenterology and Hepatology, Department of Internal Medicine, Maastricht University, Maastricht, The Netherlands

Received 7 July 2011; Revised 8 November 2011; Accepted 9 November 2011

Academic Editor: N. Sattar

Copyright © 2012 Jean L. J. M. Scheijen et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Background. Plasma and urinary levels of D-lactate have been linked to the presence of diabetes. Previously developed techniques have shown several limitations to further evaluate D-lactate as a biomarker for this condition. Methods. D- and L-lactate were quantified using ultraperformance liquid chromatography tandem mass spectrometry with labelled internal standard. Samples were derivatized with diacetyl-L-tartaric anhydride and separated on a C18-reversed phase column. D- and L-lactate were analysed in plasma and urine of controls, patients with inflammatory bowel disease (IBD), and patients with type 2 diabetes (T2DM). Results. Quantitative analysis of D- and L-lactate was achieved successfully. Calibration curves were linear (r2>0.99) over the physiological and pathophysiological ranges. Recoveries for urine and plasma were between 96% and 113%. Inter- and intra-assay variations were between 2% and 9%. The limits of detection of D-lactate and L-lactate in plasma were 0.7 μmol/L and 0.2 μmol/L, respectively. The limits of detection of D-lactate and L-lactate in urine were 8.1 nmol/mmol creatinine and 4.4 nmol/mmol creatinine, respectively. Plasma and urinary levels of D- and L-lactate were increased in patients with IBD and T2DM as compared with controls. Conclusion. The presented method proved to be suitable for the quantification of D- and L-lactate and opens the possibility to explore the use of D-lactate as a biomarker.