Relative silver(I) ion binding energies of α-amino acids: A determination by means of the kinetic method |
| |
摘 要: |
|
收稿时间: | 7 January 1998 |
Relative silver(I) ion binding energies of α-amino acids: a determination by means of the kinetic method |
| |
Authors: | Vicky W -M Lee Hongbo Li Tai-Chu Lau Roger Guevremont K W Michael Siu |
| |
Institution: | 1. Institute for National Measurement Standards, National Research Council of Canada, Ottawa, Ontario, Canada 2. Department of Biology and Chemistry, City University of Hong Kong, Kowloon, Hong Kong 3. Ottawa-Carleton Chemistry Institute, Carleton University, K1S 5B6, Ottawa, Ontario, Canada
|
| |
Abstract: | The relative silver(I) ion binding energies of 19 α-amino acids have been measured by means of the kinetic method. In general, they are similar to the relative copper(I) ion binding energies of corresponding amino acids although there are differences that can be accounted for by differences in silver(I) and copper(I) chemistry. The correlation with proton basicities is comparatively poorer. Again, the differences between silver(I) and proton binding can be attributed to differences in silver(I) and proton chemistry. The relative silver(I) binding energies measured are best described as relative basicities or ΔΔG Ag ° ’s. The observed internal consistency during construction of a silver(I) ion basicity ladder implies that ΔΔS Ag ° is approximately zero except when histidine and lysine are involved. For 16 α-amino acids, their relative silver(I) ion basicities ≈ relative silver(I) ion affinities or ΔΔG° Ag ≈ ΔΔH Ag ° . |
| |
Keywords: | |
本文献已被 ScienceDirect SpringerLink 等数据库收录! |
|