A rapid and sensitive HPLC-DAD method is developed for simultaneous determination of nicorandil and its degradation products, N-（2-hydroxyethyl） nicotinamide, nitrate ion and nicotinic acid, using nicotinamide （NT） as internal standard, at wavelength 204 nm. Nicotinic acid is identified by HPLC and GC/MS. The method can also be applied to study kinetic of degradation processes of nicorandil in storage.
Zhong Zhou CHENGZe Hui JIAYan CHENLi Ying CHENHua LI
In this paper, we develope the new standardization methods to eliminate the influence in capillary electrophoresis (CE). The markers were used to determine the basis position and then correct the data of sample by the migration time of standard sample, and make the migration time of samples consistent with the standard sample by the criterion of the marker. The problem of time transition was corrected in this way. Then according to the peak height or peak area of the marker in the sample (peak height was used here) compared with the standard sample, the sample data was zoomed appropriately. The absorbance error was made to be correct.The wavelet de-noise method was also used to make the data smooth and get a good baseline.
目的:应用多元曲线分辨-交替最小二乘(MCR-ALS)法,对7-乙基-10-羟基喜树碱与喜树碱的色谱重叠峰进行分辨,并对杂质喜树碱进行定量。方法:以渐进因子分析(EFA)解析结果作为初始值对喜树碱与7-乙基-10-羟基喜树碱的色谱重叠峰进行 ALS 迭代优化,直至收敛。结果:采用此方法分辨所得光谱还原率高,定量结果的浓度值与真实值之间线性关系良好。结论:本方法用于药物色谱重叠峰分辨结果可靠。
