食品科学 ›› 2008, Vol. 29 ›› Issue (3): 429-432.

• 分析检测 • 上一篇    下一篇

光度法测定食品添加剂山梨酸的研究

 李竹云, 王丽华, 王鲁敏, 王美兰   

  1. 烟台大学应用化学系; 烟台大学校医院; 烟台大学应用化学系 山东烟台264005; 山东烟台264005;
  • 出版日期:2008-03-15 发布日期:2011-08-24

Study on Determination of Additive Sorbic Acid in Foods

 LI  Zhu-Yun, WANG  Li-Hua, WANG  Lu-Min, WANG  Mei-Lan   

  1. 1.Department of Applied Chemistry, Yantai University, Yantai 264005, China; 2.Hospital of Yantai University, Yantai 264005, China
  • Online:2008-03-15 Published:2011-08-24

摘要: 本实验研究了以H2O2-H2SO4溶液为山梨酸的氧化体系,氧化产物丙二醛进一步与硫代巴比妥酸进行显色反应,采用分光光度法测定食品中山梨酸的含量。结果表明,在60℃下山梨酸可被0.1%H2O2-0.15mo1/LH2SO4溶液氧化,冷却后与5g/L的硫代巴比妥酸溶液在沸水浴中进行显色反应,在530nm波长处有最大吸收,显色物质在24h内吸光度无变化。山梨酸浓度在0~1.066μg/ml范围内遵守比尔定律,表观摩尔吸光系数为ε=4.26×104L/mol·cm。该法用于面酱、山楂卷、果汁、酱油等食品中山梨酸防腐剂的测定,结果令人满意。

关键词: 分光光度法, 山梨酸, 过氧化氢-硫酸, 硫代巴比妥酸

Abstract: A new oxidation system, H2O2-H2SO4solution, for sorbic acid was studied. As the oxidation product, propylene dialdehyde, will react with thiobarbituric acid and generated the color. The contents of sorbic acid have measured by spectrophotometry. Sorbic acid could be oxidized by 0.1%H2O2-0.15mo1/LH2SO4at 60 ℃ in water, and the color development will be exhibition with 5 g/L thiobarbituric acid in boiling water. The experiment results show that the maximum absorption at 530 nm, and the color product will be stabilization in 24 h. The concentration of sorbic acid will obey Beer Lambert law in the range of 0~1.066μg/ml. The apparent molar absorption coefficient is 4.26×104 L/mol·cm. The method was applied to determine the contents of sorbic acid in with satisfactory results.

Key words: spectrophotometry, sorbic acid, H2O2-H2SO4, thiobarbituric acid