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Article Dans Une Revue Applied Magnetic Resonance Année : 2022

Methionine-Based Radicals: Time Scales and Species

Résumé

Abstract l -Methionine is an amino acid, which provides anti-oxidative properties. We report on radicals and radical cations being likely (short-lived) intermediates formed upon photo-oxidation reactions of methionine. In this context, we present photo-CIDNP experiments indicating that the character of the photooxidants is decisive for the observation of CIDNP effects based on methionine. Based on calculated hyperfine data and pK a values and on our experimental observations, we suggest that CIDNP polarizations are produced by an overlay of at least three geminal radical pairs, i.e., two α -thio carbon-centered radicals D · and G ·, aminyl radical N ·, and, possibly, 2c–3e radical cation SN . + as short-lived reaction intermediates.
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hal-03692602 , version 1 (09-06-2022)

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Dmytro Neshchadin, Anne-Marie Kelterer, Chantal Houee Levin, Eduard Stadler, Martin Spichty, et al.. Methionine-Based Radicals: Time Scales and Species. Applied Magnetic Resonance, 2022, 53, pp.1331-1343. ⟨10.1007/s00723-022-01469-9⟩. ⟨hal-03692602⟩
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