Time-resolved EPR has been used to study the photoinitiated reactions of the excited triplet of duroquinone (3DQ*) quenched by the antioxidant vitamin C (VC) in homogeneous solutions of ethylene glycol/water (EG/H2O) and micelle solutions of aerosol OT (AOT) and sodium dodecyl sulphate (SDS). During the photolysis reactions of DQ and VC in homogeneous solutions of EG/H2O, 3DQ* abstracts hydrogen atoms from the solvent EG and the antioxidant VC. The rate constant for the quenching of 3DQ* by VC is 4.90 × 107 L mol−1 s−1, close to being diffusion-controlled. In AOT and SDS micelle solutions, rate constants for the quenching of 3DQ* by VC are 3.28 × 107 and 3.15 × 107 L mol−1 s−1, respectively. Lipid-soluble 3DQ* and water-soluble VC need to diffuse to the w/o interface to react, which reduces the reaction rate between 3DQ* and VC. The charge repulsion interaction between the anionic shell of AOT (SDS) micelles and the VC monoanions AsH− also slows the reaction.
Research on Chemical Intermediates – Springer Journals
Published: Jul 7, 2012
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