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Dielectric Relaxation in Biological SystemsPhysical Principles, Methods, and Applications$
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Valerica Raicu and Yuri Feldman

Print publication date: 2015

Print ISBN-13: 9780199686513

Published to Oxford Scholarship Online: August 2015

DOI: 10.1093/acprof:oso/9780199686513.001.0001

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Amino Acids and Peptides

Amino Acids and Peptides

Chapter:
(p.228) 3.2 Amino Acids and Peptides
Source:
Dielectric Relaxation in Biological Systems
Author(s):

Irina Ermolina

Yuri Feldman

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199686513.003.0009

This chapter presents an overview of the dielectric properties of amino acids and oligopeptides in aqueous solutions. Two relaxation processes identified in the aqueous solutions of amino acids are ascribed to the molecular motion of the solute and water molecules. The relaxation characteristics (i.e., the dielectric strength and relaxation time) of the process related to amino acids strongly depend on the chemical nature (polar/charged/aromatic) and size of the side groups. The dielectric properties of water are changed by the presence of solute molecules. The relaxation process for water in amino acid solutions becomes wider in comparison with pure water and is well described by the phenomenological Cole–Cole spectral function. A discussion is also presented regarding the effect of molecular mass/length of chain and composition of the polypeptide, the pH of the solution and concentration on the dielectric properties of oligopeptides and polypeptide solutions. Finally, the mechanism of triple-helix-to-single-coil transition in model collagen polypeptides is discussed.

Keywords:   amino acids, dielectric spectroscopy, dielectric relaxation, polypeptides, helix–coil transition, dipole–matrix interactions

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