食品科学 ›› 2006, Vol. 27 ›› Issue (12): 591-593.

• 分析检测 • 上一篇    下一篇

分光光度法测定蛋白酶解物中的色氨酸

任娇艳,赵谋明,王金水,崔春,杨宝   

  1. 华南理工大学轻工与食品学院;
  • 出版日期:2006-12-15 发布日期:2011-11-23

Novel Method for Spectrophotometric Determination of Tryptophan in Protein Hydrolysates

 REN  Jiao-Yan, ZHAO  Mou-Ming, WANG  Jin-Shui, CUI  Chun, YANG  Bao   

  1. College of Light Industry and Food Technology, South China University of Technology, Guangzhou 510640, China
  • Online:2006-12-15 Published:2011-11-23

摘要: 色氨酸与重氮化的对苯二胺二盐酸盐在硫酸介质中生成粉红色化合物,该化合物最大吸光值为522nm;摩尔吸光系数为0.89×104L/mol·cm;偶合产物至少稳定存在1h;色氨酸浓度在0.30~12μg/ml范围内遵循朗伯比尔定律。该方法可简便、快速、准确地测定蛋白酶解物中的色氨酸,其它大部分氨基酸不干扰色氨酸的测定。

关键词: 分光光度法, 对苯二胺二盐酸盐, 色氨酸, 蛋白水解物

Abstract: A novel spectrophotometric method for the determination of tryptophan in protein hydrolysates has been proposed. In the sensitive and simple method, the p-phenylenediamine dihydrochloride was oxided to diazotized products with the reaction of NaNO2 in H2SO4 medium. Then a pink color was developed for the product on coupling to trptophan that was stable for at least 1h. The absorption maximum is observed at 522nm and the apparent molar absorptivity is 0.89×104L/mol·cm. Beer’s law is obeyed over the range of 0.30~12μg/ml. Other materials in protein hydrolysates are free of interference on the determination of trptophan.

Key words: spectrophotometry, p-phenylenediamine dihydrochloride, tryptophan, protein hydrolysates