A new method for the simultaneous determination of D- and L-lactic acid in human plasma has been developed using high-performance liquid chromatography (HPLC) with fluorescence detection. This method is based on the reaction of lactic acid with (2S)-2-amino-3-methyl-1-[4-(7-nitro-benzo[2,1,3-oxadiazol-4-yl)-piperazin-1-yl]-butan-1-one (NBD-PZ-Val) in the presence of O-(7-azobenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HATU) and N-ethyldiisopropylamine (DIEA) to produce fluorescent diastereomeric derivatives that were easily monitored fluorimetrically at lex = 490 nm and lem = 532 nm. The separation was achieved by use of a C18 analytical column (Synergy Hydro 150 x 3 mm i.d., 4 mm). The calibration curve was linear over the on-column concentration range of 10-200 mmol/L for D-lactic acid and of 0.5-4.0 mmol/L for L-lactic acid. The sensitivity was good with a limit of detection of 5.24 mmol/L for D-lactic acid and 0.15 mmol/L for L-lactic acid. The analytical method was successfully applied to human plasma samples from normal healthy subjects.
A simple, sensitive and efficient assay for the determination of D- and L-lactic acid enantiomers in human plasma by high-performance liquid chromatography
Giorgio Cevasco;
2011
Abstract
A new method for the simultaneous determination of D- and L-lactic acid in human plasma has been developed using high-performance liquid chromatography (HPLC) with fluorescence detection. This method is based on the reaction of lactic acid with (2S)-2-amino-3-methyl-1-[4-(7-nitro-benzo[2,1,3-oxadiazol-4-yl)-piperazin-1-yl]-butan-1-one (NBD-PZ-Val) in the presence of O-(7-azobenzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate (HATU) and N-ethyldiisopropylamine (DIEA) to produce fluorescent diastereomeric derivatives that were easily monitored fluorimetrically at lex = 490 nm and lem = 532 nm. The separation was achieved by use of a C18 analytical column (Synergy Hydro 150 x 3 mm i.d., 4 mm). The calibration curve was linear over the on-column concentration range of 10-200 mmol/L for D-lactic acid and of 0.5-4.0 mmol/L for L-lactic acid. The sensitivity was good with a limit of detection of 5.24 mmol/L for D-lactic acid and 0.15 mmol/L for L-lactic acid. The analytical method was successfully applied to human plasma samples from normal healthy subjects.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
