食品科学 ›› 2004, Vol. 25 ›› Issue (12): 159-161.

• 分析检测 • 上一篇    下一篇

新型蛋氨酸测定方法的建立

 孙晓东, 王雅琴   

  1. 北京化工大学生命科学与技术学院
  • 出版日期:2005-12-15 发布日期:2011-10-24

New Determination Method of Assaying Methionine Strains

 SUN  Xiao-Dong, WANG  Ya-Qin   

  1. College of Life Science and Technology,Beijing University of Chemical Technology
  • Online:2005-12-15 Published:2011-10-24

摘要: 本文建立了一条快速、简便、精确度高的蛋氨酸测定方法。蛋氨酸与过量氯铵-T反应生成蛋氨酸亚砜,过量的氯铵—T与NTB发生氧化反应生成DTNB,一定范围内剩余的NTB的量与蛋氨酸量成正比,412nm测定其OD值;同时加入掩蔽剂DEPC可有效消除其他氨基酸尤其是含硫氨基酸的干扰。该方法适用于大量的蛋氨酸菌种的筛选工作。

关键词: 蛋氨酸, 测定方法

Abstract: A rapid simple ,convenient and highly sensitive determination method of asssaying Methionine was established in this paper. Methionine might be determined colorimetrically from the conversion of nitrothiobenzoate to 5,5′-dithiobis(2- nitrobenzoic acid) by chloramines-T remaining after oxidation of methionine to methionine sulfoxide by a known excess of reagent. The interference of amine acid especially amine acid, containing sulfhydryl groups might be effectively suppressed by reaction with DEPC. The method was applicable to large amount of methionine strains scseening.

Key words: Methionine, determination method