The present work illustrates potential of anionic cyclodextrin (CD) mediated capillary electrophoresis (CE) separation technique coupled with on-capillary diode array detector (DAD) for highly reliable enantioselective determination of dextrocetirizine (DCET) besides its major active compound (levocetirizine, LCET) in pharmaceuticals (commercial tablets). DAD detection was utilized for the characterization of composition of each separated zone via match of corresponding tested (analyte in dosage form) and reference (standard analyte in water) UV-VIS spectrum (scanned in interval 200–800 nm) being expressed mathematically through Pearson's correlation coefficient (PCC). It was demonstrated, comparing the reference and real spectra of CET enantiomers, that the applied separation method was selective enough to produce pure (spectrally homogeneous) zones of interest without any interfering comigrating compound (PCCs values were equal or higher than 0.99). Successful validation of the proposed CE-DAD method suggests its routine use for the control of enantiomeric purity of pharmaceuticals.
本研究展示了阴离子
环糊精(CD)介导的毛细管电泳(CE)分离技术与毛细管二极管阵列检测器(
DAD)联用,高度可靠地对药物(商品片剂)中右
西替利嗪(DCET)及其主要活性化合物(
左西替利嗪,LCET)进行对映体选择性测定的潜力。利用
DAD 检测法,通过匹配相应的被测物(剂型中的分析物)和参照物(
水中的标准分析物)的 UV-VIS 光谱(扫描区间为 200-800 nm)来确定每个分离区的成分特征,并通过皮尔逊相关系数 (
PCC) 进行数学表达。通过比较 CET 对映体的参考光谱和实际光谱,证明了所应用的分离方法具有足够的选择性,可以产生纯净(光谱均匀)的相关区域,而不会产生任何干扰的配位化合物(
PCC 值等于或高于 0.99)。拟议的 CE-
DAD 方法的成功验证表明,该方法可常规用于控制药物对映体的纯度。