Determination of ibuprofen and tetrazepam in human urine by micellar electrokinetic capillary chromatography

Berzas Nevado, J. J.; Rodríguez Flores, J.; Castañeda Peñalvo, G.; Rodríguez Dorado, R. M.
December 2005
Analytical & Bioanalytical Chemistry;Dec2005, Vol. 384 Issue 1, p208
Academic Journal
A new micellar electrokinetic capillary chromatography method (MEKC) is proposed for the determination of ibuprofen and tetrazepam in human urine samples over a concentration range of therapeutic interest. A fused silica capillary (60 cm × 75 μm) is used. Ibuprofen and tetrazepam are detected via UV detection at 220 and 228 nm, respectively. Separation is performed at 25 °C and at a separation voltage of 30 kV, with 15 mM borate buffer (pH 10.2) containing 40 mM sodium dodecylsulfate as the electrolyte solution. Under these conditions the analytes were separated in <11 min. Sulfamethazine is used as an internal standard. Prior to determination, the samples are purified and enriched by means of an extraction–preconcentration step with a preconditioned C18 cartridge and by eluting the compounds with methanol. Good linearity, accuracy, precision, robustness and solution stability were achieved for the technique. Detection limits of 200 μg L−1 for ibuprofen and 300 μg L−1 for tetrazepam were obtained. These analytes were then determined in real urine using the technique.


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