Chemometric resolution of fully overlapped CE peaks: quantitation of carbamazepine in human serum in the presence of several interferences.
Drug monitoring in serum samples was performed using second-order data generated by CE-DAD, processed with a suitable chemometric strategy. Carbamazepine could be accurately quantitated in the presence of its main metabolite (carbamazepine epoxide), other therapeutic drugs (lamotrigine, phenobarbital, phenytoin, phenylephrine, ibuprofen, acetaminophen, theophylline, caffeine, acetyl salicylic acid), and additional serum endogenous components. The analytical strategy consisted of the following steps: (i) serum sample clean-up to remove matrix interferences, (ii) data pre-processing, in order to reduce the background and to correct for electrophoretic time shifts, and (iii) resolution of fully overlapped CE peaks (corresponding to carbamazepine, its metabolite, lamotrigine and unexpected serum components) by the well-known multivariate curve resolution-alternating least squares algorithm, which extracts quantitative information that can be uniquely ascribed to the analyte of interest. The analyte concentration in serum samples ranged from 2.00 to 8.00 mg/L. Mean recoveries were 102.6% (s=7.7) for binary samples, and 94.8% (s=13.5) for spiked serum samples, while CV (%)=4.0 was computed for five replicate, indicative of the acceptable accuracy and precision of the proposed method.
Vera-Candioti
Luciana
L
Laboratorio de Desarrollo Analítico y Quimiometría, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Ciudad Universitaria, Santa Fe, Argentina.
Culzoni
María J
MJ
Olivieri
Alejandro C
AC
Goicoechea
Héctor C
HC
D000465:Algorithms; D000704:Analysis of Variance; D000927:Anticonvulsants / Q000097:blood*; D002220:Carbamazepine / Q000031:analogs & derivatives / Q000097:blood*; D019075:Electrophoresis, Capillary / Q000295:instrumentation / Q000379:methods; D006801:Humans; D016018:Least-Squares Analysis; D016014:Linear Models; D015999:Multivariate Analysis; D004364:Pharmaceutical Preparations / Q000097:blood; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012984:Software
D000927:Anticonvulsants; D004364:Pharmaceutical Preparations; D002220:Carbamazepine; C012227:carbamazepine epoxide