COMPARISON OF CAPILLARY ZONE ELECTROPHORESIS WITH HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY FOR THE DETERMINATION OF ADDITIVES IN FOODSTUFFS

被引:43
作者
JIMIDAR, M
HAMOIR, TP
FORIERS, A
MASSART, DL
机构
[1] VRIJE UNIV BRUSSELS,INST PHARMACEUT,DEPT PHARMACEUT & BIOMED ANAL,LAARBEEKLAAN 103,B-1090 BRUSSELS,BELGIUM
[2] VRIJE UNIV BRUSSELS,INST ORAL BIOL,DEPT MED & SPECIAL BIOCHEM,B-1090 BRUSSELS,BELGIUM
来源
JOURNAL OF CHROMATOGRAPHY | 1993年 / 636卷 / 01期
关键词
D O I
10.1016/0021-9673(93)80070-O
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A capillary zone electrophoretic (CZE) method was developed to determine caffeine, aspartame and benzoic acid in diet cola soft drinks and in artificial sweetening powders. The effects of pH, ionic strength, organic solvents and different buffers were investigated to select the optimum conditions. These consisted of a sodium phosphate buffer at pH 11 and ionic strength 0.025. The running voltage was set at 15 kV and the injection was performed hydrostatically for 30 s. The CZE method was then compared with a previously developed high-performance liquid chromatographic (HPLC) method in terms of repeatability, reproducibility, accuracy, linearity, sensitivity and separation efficiency. Both methods gave good repeatability. The relative standard deviations for reproducibility were significantly higher in CZE than in HPLC. The main reason for this is probably the condition of the wall of the capillary, which was difficult to keep constant between the days of analysis. The separation efficiency of CZE was 65-1 10 times higher than that of HPLC; on the other hand, 10-20 times lower detection limits were obtained in HPLC. Both methods were linear, but the linear ranges were different owing to the lower detection limit of HPLC. In CZE, the effect of the matrix was higher.
引用
收藏
页码:179 / 186
页数:8
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