Jump to ContentJump to Main Navigation
Dielectric Relaxation in Biological SystemsPhysical Principles, Methods, and Applications$
Users without a subscription are not able to see the full content.

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

Show Summary Details
Page of

PRINTED FROM OXFORD SCHOLARSHIP ONLINE (www.oxfordscholarship.com). (c) Copyright Oxford University Press, 2019. All Rights Reserved. Under the terms of the licence agreement, an individual user may print out a PDF of a single chapter of a monograph in OSO for personal use (for details see www.oxfordscholarship.com/page/privacy-policy).date: 16 February 2019

Amino Acids and Peptides

Amino Acids and Peptides

(p.228) 3.2 Amino Acids and Peptides
Dielectric Relaxation in Biological Systems

Irina Ermolina

Yuri Feldman

Oxford University Press

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

Oxford Scholarship Online requires a subscription or purchase to access the full text of books within the service. Public users can however freely search the site and view the abstracts and keywords for each book and chapter.

Please, subscribe or login to access full text content.

If you think you should have access to this title, please contact your librarian.

To troubleshoot, please check our FAQs , and if you can't find the answer there, please contact us .