On the basis of the two-state model of a polyelectrolyte solution, the ion concentration in the polymer domain has been calculated by using the spherical Poisson-Boltzmann equation. The ion accumulation in the neighboring of the polyion influences, on different time scales, various electrical properties of the solution, in particular the low-frequency electrical conductivity and the high-frequency dielectric dispersion. These predictions have been compared with recent dielectric measurements on poly(L-glutamic acid) aqueous solutions during the conformational transition from the alpha-helix to random coil, and a satisfactory agreement has been found. This finding suggests that counterion distribution plays a different role in determining the electrical properties of charged polymer solutions, causing a electrophoretic contribution of the polymer domain to the electrical conductivity and influencing the high-frequency dielectric dispersion.

Bordi, F., Cametti, C., Paradossi, G. (1993). Effect of counterion concentration on the dielectric behavior of a polypeptidic chain in the helix-coil transition. BIOPOLYMERS, 33(7), 1029-1035 [10.1002/bip.360330705].

Effect of counterion concentration on the dielectric behavior of a polypeptidic chain in the helix-coil transition

BORDI, FEDERICO;PARADOSSI, GAIO
1993-01-01

Abstract

On the basis of the two-state model of a polyelectrolyte solution, the ion concentration in the polymer domain has been calculated by using the spherical Poisson-Boltzmann equation. The ion accumulation in the neighboring of the polyion influences, on different time scales, various electrical properties of the solution, in particular the low-frequency electrical conductivity and the high-frequency dielectric dispersion. These predictions have been compared with recent dielectric measurements on poly(L-glutamic acid) aqueous solutions during the conformational transition from the alpha-helix to random coil, and a satisfactory agreement has been found. This finding suggests that counterion distribution plays a different role in determining the electrical properties of charged polymer solutions, causing a electrophoretic contribution of the polymer domain to the electrical conductivity and influencing the high-frequency dielectric dispersion.
1993
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore CHIM/02 - CHIMICA FISICA
English
Con Impact Factor ISI
POLY-ELECTROLYTE SOLUTIONS; POLYELECTROLYTE SOLUTIONS; POLY(L-GLUTAMIC ACID)
Bordi, F., Cametti, C., Paradossi, G. (1993). Effect of counterion concentration on the dielectric behavior of a polypeptidic chain in the helix-coil transition. BIOPOLYMERS, 33(7), 1029-1035 [10.1002/bip.360330705].
Bordi, F; Cametti, C; Paradossi, G
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/44562
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