Abstract
The photoinitiated oxidation of β-NADH catalyzed by horseradish peroxidase (Per3+) was studied by time-resolved photoinitiated chemically induced dynamic nuclear polarization (CIDNP). The polarization observed on protons at the C(4) atom of the β-NADH molecule is evidence for the reversible one-electron transfer between the radical cation NADH+· and the ferroperoxidase intermediate (Per2+). A new approach based on electron transitions in the (NADH+· Per2+) pair was proposed to describe the formation of CIDNP effects in systems including quartet (Q)—doublet (D) electron transitions.
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