波谱学杂志 ›› 1988, Vol. 5 ›› Issue (4): 349-356.

• 研究论文 • 上一篇    下一篇

水溶液中L-半胱氨酸与稀土离子作用的NMR研究

任吉民, 裴奉奎, 王文韵   

  1. 中国科学院长春应用化学研究所
  • 收稿日期:1987-11-11 修回日期:1988-03-21 出版日期:1988-12-05 发布日期:2018-01-22

NMR STUDY OF INTERACTION OF L-CYSTEINE WITH LANTHANIDE IONS IN AQUEOUS SOLUTIONS

Ren Jimin, Pei Fengkui, Wang Wenyun   

  1. Changchun Institute of Appled Chemistry Academia Sinica, Changchun
  • Received:1987-11-11 Revised:1988-03-21 Online:1988-12-05 Published:2018-01-22

摘要: 本文测定了在八种不同稀土离子存在下(La、Pr、Nd、Eu、Dy、Ho、Er和Tm)L-半胱氨酸的1H和13C稀土诱导位移。络合物生成位移和诱导位移的pH依赖关系说明L-半胱氨酸通过离子化的羧基与稀土离子配位,络合物稳定常数说明巯基的存在有利于氨基酸的配位作用。对偶极位移模拟结果表明,在半胱氨酸稀土络合物中,羧基和巯基成旁式,羧基以单齿形式与稀土离子配位。

关键词: 1H, 13C-NMR谱, L-半胱氨酸, 稀土诱导位移

Abstract: Lanthanide-induced shifts have been measured for 1H and 13C nuclei of L-cy-steine in the presence of eight different lanthanide cations (La, Pr, Nd, Eu,Dy, Ho, Er, Tm).The complex formation shift and the pH dependance of lanthanide-induced shift indicate that L-cysteine is coordinated to lanthanide cations through its ionized carboxylic group.The complex stability constants show that sulfhydryl group is favorable for amino acid coodinating to lanthanide ions. The simulated calculation of the dipolar shift reveals that carboxylic and sulfhydryl groups are in gauche position in the complexes of L-cysteine and carboxylic group is coordinated to lanthanide cations through a single oxygen atom.

Key words: 1H, 13C-NMR spectra, L-cysteine, lanthanide-induced shift