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PHOTOCHEMISTRY OF BIOLOGICAL MOLECULES—III. MECHANISM OF PHOTODAMAGE OF ALANINE PEPTIDES IN THE SOLID STATE
Author(s) -
JOHNS R. B.,
SEURET M. G.
Publication year - 1970
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.1751-1097.1970.tb06071.x
Subject(s) - radical , chemistry , photochemistry , primary (astronomy) , decarboxylation , photodissociation , intermolecular force , hydrogen atom , molecule , alanine , irradiation , derivative (finance) , organic chemistry , amino acid , alkyl , catalysis , biochemistry , physics , astronomy , nuclear physics , financial economics , economics
— –The structures of the primary radicals formed by 2537 Å photolysis at —196° of alanine peptides of varying size have been determined. The conversion of the primary to stable secondary radicals on heat treatment has been followed in detail by ESR techniques and the chemical change shown to be intermolecular hydrogen atom transfer. The primary photochemical event is shown to be decarboxylation, but photodamage cannot be prevented by conversion of the carboxyl group to an acid derivative.