Citation:
ZHANG Huanhuan, LI Jiang, ZHAO Shan, DING Xiaojing, WANG Zhi. Rapid determination of lactose, sucrose, glucose and fructose in foods by capillary zone electrophoresis with indirect ultraviolet detection[J]. Chinese Journal of Chromatography,
;2015, 33(8): 816-821.
doi:
10.3724/SP.J.1123.2015.03042
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A new and rapid method for the simultaneous determination of lactose, sucrose, glucose and fructose by capillary zone electrophoresis (CZE) with indirect ultraviolet detection was developed. The separation was completed with an uncoated fused-silica capillary with 30.2 cm of total length (effective length of 20 cm)×50 μm. The separation buffer consisted of 4 mmol/L potassium sorbate, 10 mmol/L sodium phosphate, 30 mmol/L NaOH (pH 12.56) and 0.5 mmol/L hexadecytrimethylammonium bromide (CTAB). The separation was performed at a voltage of -8 kV with the ultraviolet detection at 254 nm. The analysis of the four carbohydrates was completed within 10 min. The limits of detection (S/N=3) for lactose, sucrose, glucose and fructose were 50, 75, 25 and 25 mg/L, and the limits of quantification (S/N=10) were 150, 225, 75 and 75 mg/L, respectively. The average recoveries for the four carbohydrates were in the range of 87.0%-107.0% with the relative standard deviations of 1.2%-4.7%. No organic solvent was consumed throughout the whole process of the analysis. The method was used for the analysis of nine food samples and a quality control sample. The results demonstrated that the method is simple, rapid, accurate, and suitable for the routine analysis of the four carbohydrates in food samples.
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