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Dielectric dispersion of the α-helix at the transition region to random coil

✍ Scribed by Akiyoshi Wada; Toyoichi Tanaka; Hiroshi Kihara

Publisher
Wiley (John Wiley & Sons)
Year
1972
Tongue
English
Weight
867 KB
Volume
11
Category
Article
ISSN
0006-3525

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✦ Synopsis

a p a n synopsis Dielectric studies have been carried out for the helix-coil transition of poly-p-benzyl-Gaspartate with m-cresol as a solvent. The transition of the solute molecules has been sharply reflected as a characteristic change in the dielectric dispersion curves in changing temperature. Two polarizations, one having a low and the other a high critical frequency, have appeared. According to theoretical considerations of a model of a broken helix, the former is found to come from the orientation of helical sequences and the latter from the chemical relaxation due to the helix-coil transition. It also seems likely that the unfolded chain may have a polarizability which could not be neglected at the high-temperature side of the transition.

* We wish to thank Dr. A. Teramoto for his kind gift of PBLA samples.

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