Effects of Hg(C104)2, HgC12, and AgC104 on the conformations of poly-(S-carboxymethyl-L-cysteine) and Poly[S-(2-carboxyethyl)-L-cysteine] in Solution

被引：0

作者：

Oka, Kazuki ^{[1
]}

Maeda, Hiroshi ^{[1
]}

Ikeda, Shoichi ^{[1
]}

机构：

[1] Department of Chemistry, Faculty of Science, Nagoya University, Chikusa-ku, Nagoya,464, Japan

来源：

Bulletin of the Chemical Society of Japan | 1984年 / 57卷 / 06期

关键词：

Silver halides - Dichroism - Amino acids - Chlorine compounds;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The effects of Hg(C104)2, HgC12, and AgC104 on the conformations of fully neutralized poly(S-carboxymethyl-l-cysteine) and poly[S-(2-carboxyethyl)-l-cysteine] in the absence of supporting electrolytes were examined by circular dichroism (CD) spectra. The induction of the /3-form was suggested by the addition of Hg(C104)2 and AgC104, while it could not be concluded in the case of HgCl2. Spectroscopic evidence for the coordination of metals with the two polypeptides was provided in the case of Hg(C104)2 and HgCl2 by the appearance of a new CD band around 250-260 nm as well as the distortion of the polymer CD spectra in the region of 200-230 nm, while it was not obtained in the case of AgClp4. The decrease of pH observed on addition of the three metal compounds also suggested the conformational change. Extraordinary lowering of pH and enhanced solubility were observed on addition of HgCl2. © 1984 The Chemical Society of Japan.

引用

页码：1473 / 1477