The oxidation of ascorbic acid by Fe3+ ion has been studied using the stopped-flow technique in an attempt to detect and study the formation of an intermediate. It has been shown that a transient species, believed to be a ferric ascorbate complex, and exhibiting a broad absorption band with λmax.= 560 nm is formed by a two-step mechanism. Values of 11 ± 6 l mol–1 cm–1 and 0·55 ± 0·4 for the extinction coefficient and formation constant respectively at 25 °C have been obtained for the overall complex formation. At 0 °C, the first step in the reaction is governed by the law, Rate =k[Fe3+][H2A], where k has the value of 30 ± 10 l mol–1 s–1. The probable mechanism of both the complex formation and overall redox reaction are discussed.
No takes yet. Share an insight, caveat, or question.
Laurence et al. (1972) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: