A comparative study of two novel validated spectrophotometric techniques for resolution of four-component mixtures with severely overlapping spectra
作者:Nessreen S. Abdelhamid
DOI:10.1016/j.saa.2020.118213
日期:2020.6
double divisors used are normalized spectra of diphenhydramine /N-oxide degradate of diphenhydramine binary mixture for both paracetamol and p-aminophenol and paracetamol/p-aminophenol binary mixture for both diphenhydramine hydrochloride and its N-oxide degradate. The double divisors binary mixtures contain 40 μg/mL of each component. The selected wavelengths are 243–233 nm, 223.8–270.2 nm, 237–250 nm
开发并验证了两种新的智能分光光度法,用于测定扑热息痛(对乙酰氨基酚),苯海拉明,对氨基苯酚和N-氧化物降解苯海拉明的四元混合物。方法A是一种新颖的三除数比差方法,其中感兴趣组分的三除数比谱在两个选定的波长处显示出明显的幅度差,其中三种干扰物质用作三除数并在整个光谱范围内给出恒定的幅度。三重除数是包含3种干扰成分中每种成分的40μg/ mL的三次混合物的归一化光谱。这四个分量的选定波长分别为256–290 nm,220–230 nm,230–245 nm和275–260 nm。方法B是双除数-比率差-双波长 其中感兴趣的组分的双除数比谱在两个选定的波长处显示出明显的幅度差异,其中两种干扰物质用作双除数并在整个光谱上给出恒定的幅度,而第三个在这两个选定的波长处显示出零幅度差异波长。所用的双除数是对乙酰氨基酚和对氨基苯酚的苯海拉明二元混合物的苯海拉明/ N-氧化物降解物的归一化谱图,对于盐酸苯海