食品科学 ›› 2012, Vol. 33 ›› Issue (12): 196-199.doi: 10.7506/spkx1002-6630-201212039

• 分析检测 • 上一篇    下一篇

微波程序消解- 电导率微量滴定法快速测定贼小豆中的粗蛋白

高向阳,王惠荣,任婷婷   

  1. 河南农业大学食品科学技术学院
  • 出版日期:2012-06-25 发布日期:2012-07-27
  • 基金资助:
    河南省重点学科建设基金项目(10466-X-082301)

Rapid Determination of Crude Protein in Vigna minima Seeds by Microwave Programmed Digestion-Conductivity Micro-titration

GAO Xiang-yang,WANG Hui-rong,REN Ting-ting   

  1. (College of Food Science and Technology, Henan Agricultural University, Zhengzhou 450002, China)
  • Online:2012-06-25 Published:2012-07-27

摘要: 为建立一种快速测定食品中粗蛋白质的新型分析方法,选择郑州地区野生贼小豆为样品,用硫酸-过氧化氢混合溶液为消解剂,利用微波压力程序消解技术,将样品中的粗蛋白处理为NH4+,用中性甲醛将NH4+转化为H+后,用NaOH标准溶液以电导微量滴定法测定。结果表明:贼小豆样品中粗蛋白质含量均值为23.41%,平行测定的相对标准偏差为1.5%(n=5)。与经典标准方法对照测定,经过F值检验和t值检验表明无显著性差异(置信度为95%)。该法具有简便、灵敏、快速、准确、直观、无需对样品消解液进行蒸馏和使用指示剂等显著优点,结果令人满意。

关键词: 微波程序消解, 电导率, 微量滴定法, 粗蛋白质, 贼小豆

Abstract: A new analytical method to rapidly determine protein content in Vigna minima seeds was established in the present study. Samples were digested with a sulfuric acid-hydrogen peroxide solution by microwave programmed digestion to convert crude protein to NH4+. The NH4+ generated in the solution were further converted to H+ ions for conductivity micro-titration with standard NaOH solution. The results showed that the average content of protein in wild Vigna minima seeds from Zhengzhou was determined to be 23.41% with relative standard deviation (RSD) of 1.5% (n = 5). Compared with the classic standard determination method, the conductivity micro-titration did not exhibit significant difference as analyzed by F-test and t-test at 95% confidence level. This method has the advantages of convenient operation, high sensitivity, quick determination, accurate results and no requirements for indicators.

Key words: microwave program digestion, conductivity, micro-titration method, crude protein, Vigna minima

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