Abstract
Room-temperature free radicals produced in gamma-irradiated polyerystalline thymidine and deoxy-cytidine hydrochloride were studied by spin-trapping and ESR methods with NtB (nitroso-t-butane) serv-ing as the spin trap. Three types and two types of base radicals were identified for them respectively,which was completely consistent with the results in single-crystal ESR studies, and thereby standard ESRspectra of their R·spin adducts were obtained. In addition, ribose radicals HOC(5')HC(4')H and-C(5')H_2, derived from the former, were ascertained for deoxytidine hydrochloride. Both of them havenot been identified in single-crystal ESR studies.
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