Radiation chemistry of biopolymers by Gennady Zaikov, Sharpatyi

By Gennady Zaikov, Sharpatyi

This monograph—based at the authors direction lectures on radiation chemistry of biopolymers—deals with the first levels of radiation-chemical transformation of major biopolymers. exact consciousness is given to radiolysis in their aqueous ideas, formation and conversion mechanisms of macroradicals, synthesized in acts of solvent radical interplay with biopolymer molecules and of their ordinary complexes.

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FREE RADICALS AND THEIR CONVERSIONS Radicals represent particles, atoms and parts of molecules having unpaired valence electrons. This definition indicates that such particles are formed at radiation impacting of substances due to the act of ionization (electron removal from a molecule or an atom) and excitation with subsequent bond break in the molecule. The next Chapter discusses the nature and properties of radicals more comprehensively. As electron is detached from or added to neutral molecule, charged particle with unpaired electron is formed: cation-radical or anion-radical.

737. (Rus) 5. , The Radiation Chemistry of Carbohydrates, Moscow, Nauka, 1978, 288 p. (Rus) 6. A. , Radial. Biologia. Radioekologia, 2000, vol. 40(2), p. 133. (Rus) Chapter 5. 1. SUBSTANCES- THE RADICAL ACCEPTORS Determination of reaction rate constants Water and solution radiolysis products are results of the interaction of radicals formed from water with one another and dissolved substances. All water-soluble substances may be considered as water radical acceptors. Interacting with water radicals, they form radicals of dissolved compounds.

5). Further on, anion-radicals degrade with ammonia release. The general process proceeds according to the following scheme: o- 0 II o • I II R-CH-C-OH + e----. R-CH-C-OH____. R-CH-C-OH + NH 3 I • • I NH +• NH3+ 3 Chapters 7 - 11 present more detailed information on the radical formation and conversion mechanisms under the radiation impact on aqueous solutions ofbiopolymers, obtained by the low-temperature radiolysis method. A. 01)** Notes: *Values m square brackets are pK for correspondmg functwnal groups.

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