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Solvent- and salt-induced coil–helix transition of alkali metal salts of poly(L-glutamic acid) in aqueous organic solvents

✍ Scribed by Mitsuru Satoh; Yoshitake Fujii; Fusaaki Kato; Jiro Komiyama

Publisher
Wiley (John Wiley & Sons)
Year
1991
Tongue
English
Weight
708 KB
Volume
31
Category
Article
ISSN
0006-3525

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✦ Synopsis

The coil-helix transition has been studied for alkali metal salts of poly (L-glutamic acid) ( P L G ) , 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 constant D , Gutmann's acceptor number AN, and water activity G . 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 carboxyl anion.

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