Quantification of chlorpheniramine maleate enantiomers by ultraviolet spectroscopy and chemometric methods.
Chlorpheniramine maleate (CLOR) enantiomers were quantified by ultraviolet spectroscopy and partial least squares regression. The CLOR enantiomers were prepared as inclusion complexes with beta-cyclodextrin and 1-butanol with mole fractions in the range from 50 to 100%. For the multivariate calibration the outliers were detected and excluded and variable selection was performed by interval partial least squares and a genetic algorithm. Figures of merit showed results for accuracy of 3.63 and 2.83% (S)-CLOR for root mean square errors of calibration and prediction, respectively. The ellipse confidence region included the point for the intercept and the slope of 1 and 0, respectively. Precision and analytical sensitivity were 0.57 and 0.50% (S)-CLOR, respectively. The sensitivity, selectivity, adjustment, and signal-to-noise ratio were also determined. The model was validated by a paired t test with the results obtained by high-performance liquid chromatography proposed by the European pharmacopoeia and circular dichroism spectroscopy. The results showed there was no significant difference between the methods at the 95% confidence level, indicating that the proposed method can be used as an alternative to standard procedures for chiral analysis.
Valderrama
P
P
Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil.
Romero
A L
AL
Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil.
Imamura
P M
PM
Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil.
Magalhães
I R S
IRS
Pharmaceutical Science Faculty, University of São Paulo - USP, 14040-903, Ribeirão Preto, SP, Brazil.
Bonato
P S
PS
Pharmaceutical Science Faculty, University of São Paulo - USP, 14040-903, Ribeirão Preto, SP, Brazil.
Poppi
R J
RJ
Institute of Chemistry, University of Campinas - UNICAMP, P.O. Box 6154, 13083-970, Campinas, SP, Brazil. ronei@iqm.unicamp.br.
D020001:1-Butanol / Q000378:metabolism*; D002138:Calibration; D002744:Chlorpheniramine / Q000032:analysis* / Q000737:chemistry* / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D002942:Circular Dichroism; D013056:Spectrophotometry, Ultraviolet; D013237:Stereoisomerism; D047392:beta-Cyclodextrins / Q000378:metabolism*
D047392:beta-Cyclodextrins; D002744:Chlorpheniramine; D020001:1-Butanol; C031215:betadex