食品科学 ›› 2011, Vol. 32 ›› Issue (12): 251-253.doi: 10.7506/spkx1002-6630-201112055

• 分析检测 • 上一篇    下一篇

阻抑动力学分光光度法快速测定保健品中的维生素C

刘瑛,田志壮,朱逸雯,姜子卿,商少明   

  1. 1.江南大学化学与材料工程学院 2.郑州轻工业学院材料与化学工程学院
  • 出版日期:2011-06-25 发布日期:2011-06-10

Rapid Inhibitory Kinetic Spectrophotometric Determination of Vitamin C in Healthcare Products

LIU Ying1,TIAN Zhi-zhuang2,ZHU Yi-wen1,JIANG Zi-qing1,SHANG Shao-ming1   

  1. 1. School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, China; 2. School of Material and Chemical Engineering, Zhengzhou Institute of Light University, Zhengzhou 450002, China
  • Online:2011-06-25 Published:2011-06-10

摘要: 研究保健品中VC含量的快速测定方法。以Fe(Ⅱ)为催化剂、双氧水为氧化剂,在酸性介质中将无色的邻苯二胺溶液迅速氧化成橙红色溶液,该产物于450nm波长处有最大吸收。结果表明,VC对该反应有显著抑制作用,当VC加入到反应体系中时,产物的吸光度明显下降,产物于450nm波长处的吸光度随着加入到体系中的VC浓度的增加而线性降低,线性范围为4.0×10-6~3.0×10-4mol/L。本方法操作简单、成本低、选择性好、结果准确,适合保健品中VC的快速测定。

关键词: 邻苯二胺, 分光光度法, 过氧化氢, 硫酸亚铁, 微生素C

Abstract: In order to explore a rapid determination method for vitamin C in healthcare products, colorless o-phenylenediamine (o-PD) solution was subjected to oxidation to form a soluble orange-red product by H2O2 as the oxidant and Fe (Ⅱ) as the catalyst in an acidic environment. The maximum absorbance of the product was located at 450 nm. However, ascorbic acid exhibited an obvious inhibitory effect on that reaction system and could result in the decreased absorbance of the product. The reduction of the absorbance was inversely proportional to the concentration of ascorbic acid in the linear range of 4.0 × 10-6-3.0 × 10-4 mol/L, which was suitable for the rapid determination of vitamin C in healthcare products with the advantages including convenient operation, low-cost reagents and instruments, high selectivity and high accuracy.

Key words: o-phenylenediamine, spectrophotometry, hydrogen peroxide, ferrous sulfate, vitamin C

中图分类号: