生物技术通报 ›› 2013, Vol. 0 ›› Issue (2): 190-194.

• 研究报告 • 上一篇    下一篇

一种改进的赖氨酸浓度测定方法

姜安娜1,2 曹名锋1,2 李庆刚1,2 郑平1,2 杨洪江1 孙际宾1,2   

  1. (1. 天津科技大学生物工程学院,天津 300457; 2. 中国科学院天津工业生物技术研究所,天津 300308; 3. 中国科学院系统微生物工程重点实验室,天津 300308)
  • 收稿日期:2012-07-05 修回日期:2013-02-27 出版日期:2013-02-26 发布日期:2013-02-27
  • 作者简介:姜安娜,女,硕士研究生,研究方向:生物化学与分子生物学;E-mail :annajiang_anj@163.com
  • 基金资助:
    国家重点基础研究发展计划“973 ”计划(2009CB724703)

A Modified Method for Quantification of L-lysine

Jiang Anna1,2 Cao Mingfeng2,3 Li Qinggang2,3 Zheng Ping2,3 Yang Hongjiang1 Sun Jibin2,3   

  1. (1. School of Biological Engineering,Tianjin University of Science and Technology,Tianjin 300457 ;2. Tianjin Institute of Industrial
  • Received:2012-07-05 Revised:2013-02-27 Published:2013-02-26 Online:2013-02-27

摘要: 茚三酮显色法是一种常用的氨基酸测定方法,可以对游离氨基酸进行定性、定量分析,但检测赖氨酸的选择性和准确度却较差。本研究通过对传统茚三酮方法的改进实现赖氨酸的特异性检测。研究发现,在pH2.2 的磷酸氢二钠- 柠檬酸缓冲液中只有赖氨酸可与茚三酮- 铁试剂在480 nm 处发生特征显色反应,其最佳测定条件为100℃反应35 min ;并发现改进的方法赖氨酸的有效浓度为0-200 mmol/L。此方法可以排除脯氨酸、鸟氨酸、甘氨酸、精氨酸和组氨酸等杂质氨基酸的干扰,而且适用于对发酵液中赖氨酸浓度进行直接测定,结果准确可靠。

关键词: 赖氨酸, 茚三酮-, 铁试剂, 显色反应, 特异性检测

Abstract: A modified method was established to determine lysine concentration using ninhydrin-ferric reagents. Unlike the traditional method which measures the total amino acids, our modification showed high specificity and favorable linearity to lysine(0-200 mmol/L). In our protocol the characteristic absorption at 480 nm was measured after the reaction mixture was boiled for 35 minutes in disodium hydrogen phosphate-citrate buffer at pH2.2. The method not only successfully excludes the interference of impurities including proline, ornithine, glycine, arginine and histidine, but offers the accurate and reliable determination of the lysine in the fermentation broth directly.

Key words: Lysine, Ninhydrin-ferric reagents, Color reaction, Specific detection