Premium
Anomalous behavior of electrical conductivity of solubilized collagen solutions with thermal denaturation
Author(s) -
Matsushita Satoru,
Deki Shigehito,
Mizuhata Minoru,
Sugita Masami,
Kanaji Yukio
Publication year - 1993
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1993.070501114
Subject(s) - activation energy , denaturation (fissile materials) , electrical resistivity and conductivity , analytical chemistry (journal) , solubilization , thermodynamics , thermal conductivity , chemistry , materials science , composite material , chromatography , nuclear chemistry , biochemistry , physics , electrical engineering , engineering
The temperature dependence of the electrical conductivity, σ, for a collagen solution was measured in the temperature region including the thermal denaturation temperature, t d . The σ increased with temperature, t , but decreased at ca. 40°C, and then again increased. In this temperature region, a change of optical rotation, α D , was observed. The change is due to the thermal denaturation. The differential curve of σ vs. t gave clear deflection points and a large peak at ca. 40°C. The t d could be estimated from the peak temperature. The t d decreased with the increase in the concentration of collagen and with the decrease in the heating rate. These measurements were carried out for the collagen prepared by various methods. Some of them showed one peak; others had two peaks. The t d obtained by the measurement of σ correlated with that obtained by the measurement of α D . The activation energy of σ, Δ E a , obtained from the linear relationship between log σ and 1/ T , increased with the concentration of collagen, but was unchanged for the heating rate. The Δ E a obtained for various types of collagen showed a constant value. © 1993 John Wiley & Sons, Inc.