Abstract
G-values of the formation of ferromyoglobin (Mb II) have been determined for the continuous γ-radiolysis of N 2O-saturated neutral aqueous solutions containing ferrimyoglobin (Mb III) and a series of aliphatic alcohols (RH) under conditions such that the competition for the primary .OH radicals favors RH. A comparison of the efficiencies of reduction of Mb III by the secondary organic radicals formed via H-abstraction reactions with estimates from the literature of the fraction of .OH attack at the C-atom α to the —OH group indicates that α-hydroxyalkyl radicals are primarily responsible for the observed reduction. Significantly lower reduction yields are observed when RH = 1,2-diol, compared with the expected yields of strongly reducing 1,2-dihydroxyalkyl radicals; the initial reducing radicals convert into inactive β-alkanonyl analogues so that the reduction of Mb III is not kinetically competitive with the β-elimination process. Mb III is useful as a probe of the occurence of slow conversion processes involving radiolytically-generated radicals.
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Schedule a callMore From: International Journal of Radiation Applications & Instrumentation. Part C, Radiation Physics & Chemistry
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