Determination of Serum Concentrations of Phenbarbital,Phenytoin Sodium and Carbamazepine by MEKC / 中国药房

ABSTRACT

OBJECTIVE:To determine serum concentrations of phenbarbital(PB),phenytoin sodium(PHT),carbamazepine(CBZ)by micellar electrokinetic capillary chromatograph(MEKC).METHODS:The determination was performed on elastic quartz column(37 cm?50 ?m)with barbital as internal standard.The buffer solution consisted of 10 mmol?L-1 phosphate sodium buffer-30 mmol?L-1 SDS sodium(micellar phase)-15% methanol at a constant voltage of 18 kV.The detection wavelength was set at 210 nm.RESULTS:The linear concentration ranges of PB and PHT were 2.5～80 ?g?mL-1,with detective concentration of 0.1 ?g?mL-1;the linear range and detective concentration of CBZ were 1～32 ?g?mL-1 and 0.2 ?g?mL-1,respectively.The average recoveries of the PB,PHT,and CBZ were 99.90%,99.91%,and 99.42%,respectively.CONCLUSION:The method is rapid,simple,accurate,sensitive and reproducible,and suitable for clinical monitoring of drug level and pharmaceutical study.