Simultaneous determination of l- and d-lactic acid in plasma by capillary electrophoresis

• DOI: 10.1016/j.jchromb.2004.10.059
• Publication Date: 2004-11-18T06:37:36Z
• Authors: Li Tan; Yu Wang; Xiaoquan Liu; Huangxian Ju; Jieshou Li
• Keywords: Electrolytes; Animals; Electrophoresis, Capillary; Humans; Stereoisomerism; Lactic Acid; Buffers; Sensitivity and Specificity; 01 natural sciences; Rats; 0104 chemical sciences

A novel method for simultaneous determination of d- and l-lactic acids in plasma was presented by capillary electrophoresis with photodiode array detection at 195nm. The separation was performed in an uncoated fused-silica capillary. The parameters influencing the resolution and the migration time of lactic acids were optimized. When 150mM phosphate-Tris buffer (pH 7.0) consisting of 220mM 2-hydroxypropyl-beta-cyclodextrin and 0.2mM tetradecyltrimethylammonium bromide was utilized as the running buffer, highly effective chiral separation of d- and l-lactic acids was achieved at about 42min at an effective voltage of -25kV. The resolution of lactic acid enantiomers was >/=1.25. The limits of detection of d- and l-lactic acids in standard solution without any pretreatment were 80 and 50muM (S/N=3), respectively. Sample pretreatment was preceded by protein-removal procedure with acetonitrile. With a pre-concentration procedure by 10 times, the limits of detection of d- and l-lactic acids were 20 and 15muM (S/N=10), respectively. The satisfactory analytical performance of the proposed method was validated.