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A Microcalorimetric and Electron Spin Resonance Study of the Influence of UV Radiation on Collagen

Metreveli, Nunu and Namicheishvili, L.O. and Dzhariashvili, K.K. and Chikvaidze, E.N. and Mrevlishvili, G.M. (2006) A Microcalorimetric and Electron Spin Resonance Study of the Influence of UV Radiation on Collagen. Biophysics, 51 (1). pp. 29-32. ISSN 0006-3509

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Abstract

It was demonstrated microcalorimetrically that UV radiation cardinally changed the behavioral pattern of the temperature dependence of heat capacity of a collagen solution and decreased the enthalpy of collagen denaturation. It was discovered by electron spin resonance (ESR) that the primary products of UV-irradiated acid-soluble collagen were atomic hydrogen and the anion radical of acetic acid. The latter, when exposed to long-wavelength UV light, converted into the methyl radical, which interacted with acetic acid to produce the acetic acid radical. These free radicals interacted with the collagen molecule, leading to the appearance of seven superfine components with the split H=1.13 mT in the ESR spectrum. It was assumed that this spectrum is related to the free radical that occurred in the proline residue of the collagen molecule, which, in this particular case, was the major defect in the triple helix of collagen that caused instability of the macromolecule.

Item Type: Article
Subjects: Q Science > QC Physics
Q Science > QH Natural history > QH301 Biology
Divisions: Institutes > Institute of Biophysics
Depositing User: პროფესორი ნუნუ მეტრეველი
Date Deposited: 28 Feb 2014 13:40
Last Modified: 12 Mar 2014 15:14
URI: http://eprints.iliauni.edu.ge/id/eprint/1301

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