Solvent‐ and salt‐induced coil–helix transition of alkali metal salts of poly(L‐glutamic acid) in aqueous organic solvents
作者:
Mitsuru Satoh,
Yoshitake Fujii,
Fusaaki Kato,
Jiro Komiyama,
期刊:
Biopolymers
(WILEY Available online 1991)
卷期:
Volume 31,
issue 1
页码: 1-10
ISSN:0006-3525
年代: 1991
DOI:10.1002/bip.360310102
出版商: Wiley Subscription Services, Inc., A Wiley Company
数据来源: WILEY
摘要:
AbstractThe coil–helix transition has been studied for alkali metal salts of poly (L‐glutamic acid) (PLG), i.e., PLGLi, ‐Na, ‐K, and ‐Cs, in aqueous organic solvent systems. Dependence of the transition on the solvent composition has been qualitatively discussed in terms of the solvent dielectric constantD, Gutmann's acceptor number AN, and water activityaw. The helix formation induced by addition of alkali chlorides has also been studied. The sharpness of the transition has been interpreted as a measure of reduction of electrostatic energy of helical PLG through contact ion‐pair formation between a counterion and car
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