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DECAY KINETICS OF FREE RADICALS IN IRRADIATED PROTEINS
Author(s) -
SHATKAY A.,
MICHAELI I.
Publication year - 1972
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1972.tb06254.x
Subject(s) - radical , kinetics , irradiation , chemistry , kinetic energy , reaction rate constant , thermodynamics , consistency (knowledge bases) , constant (computer programming) , nuclear physics , physics , organic chemistry , mathematics , computer science , geometry , quantum mechanics , programming language
— A detailed analysis is presented of the decay kinetics of free radicals in irradiated biopolymers. Available data in the literature are critically evaluated and new data for irradiated keratin are presented. It is shown that a rigorous analysis of the data available in the literature leads to more detailed information on the decay mechanisms than the conclusions which have been previously given; in some cases the analysis leads to mechanisms contradicting those claimed in the literature. Our results suggest that the free radicals in illuminated keratin consist of three distinct species: one of the species decays with a half life of approximately 20 hr, the second has a half life of about 4600 hr, while the half life of the third is so long that the free radical concentration is practically constant. A similar behaviour is obtained on assumption of second order decay. The consistency of the kinetic constants obtained has been verified in kinetic experiments using samples prepared under very different experimental conditions.