食品科学 ›› 2000, Vol. 21 ›› Issue (2): 60-62.

• 分析检测 • 上一篇    下一篇

抗坏血酸及L-半胱氨酸的流动注射动力学同时测定法

曾飒,谭辉玲   

  1. 中山医科大学化学教研室; 重庆大学化工学院;
  • 出版日期:2000-02-15 发布日期:2011-11-25

Simultaneous Determination of VC and L-cys in Fruit Juices by Stopped-Flow Kinetic Spectrophotometry

 ZENG  Sa, TAN  Hui-Ling   

  • Online:2000-02-15 Published:2011-11-25

摘要: pH2~9时。抗坏血酸与L-半胱氨酸均可与Fe3+-邻菲咯啉混合液反应;生成Fe2+-邻菲咯啉有色配合物,但二者反应速度相差极大、根据这个原理,本研究采用流动注射分析停流技术,建立了抗坏血酸与L-半胱氨酸的动力学分光光度同时测定法.二者测定的线性范围分别为0-24mg/L及0~280mg/L,相应的检测限为1mg/L及16mg/L,抗坏血酸与L-半胱氨酸浓度分别为12.mg/L、及160.0mg/L时,测定的相对标准偏差分别为0.9%及0.6%,采样频率为30样/h。该法灵敏、快速、准确、选择性较高,且流路及设备简单,实用性强,用于实际样品测定,抗坏血酸及L-半胱酸的加标回收率分别可达95.2%及92.8%

关键词: 停流流动注射分析, 分光光度法, 同时测定, 抗坏血酸, L-半胱氨酸

Abstract: Astopped-flow kinetic spectrophotometric method is proposed for the simultaneous determination of ascorbic acid (Vc ) and L-cysteine(L-cys)in fruit juices.The calibration graphs are linear for 0-24.0-280mg/L and the detection limits are lmg/ L and 16mg/L for Vc and L-cys.respectively.The injectd sample volume is 157uL and the sampling rate is 30 samples/h.This method is simple rapid. sensitive and accurate with high selectivity and has been applied for determination of Vc and L-cys in strawberry juice.The marked recovery rates are up to 95.2%and 92.8%for Vc and L-cys respectivily.

Key words: Stopped Folw Analysis Simultaneous Determination Spectrophotometric method Ascorbic acid L-cysteine