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A Study On the Interactions Between Coenzyme Q0 and Superoxide Anion. Could Ubiquinones Mimic Superoxide Dismutase (Sod)?

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An electrochemical study was carried out on 1,4-benzoquinone, duroquinone, coenzymes Q0 and Q10 in the absence and in the presence of molecular oxygen in aprotic (DMF) and protic (DMF/H2O 95:5 (v/v)) media. Water was added because the investigated reactions are deeply influenced by the presence of protons. Q0 and Q10 exhibited a similar electrochemical behaviour. Since Q0 is more soluble in protic medium than the biologically more important analogue Q10, it was chosen as a model for a more detailed investigation. Voltammetric studies of Q0 carried out in aprotic and protic media in the presence of oxygen showed that, besides simple O2- dismutation, theQ0 promoted dismutation of O2- should also be considered. Spectroelectrochemical experiments with the same experimental conditions support the electrochemical results, showing that in the presence of superoxide and in aprotic medium semiquinone Q0- gives rise to a disproportionation equilibrium, while in the presence of water it tends to be reoxidized to the starting Q0 by OOH. EPR measurements are also in agreement with these results.

Affiliations: 1: Dipartimento di Ingegneria Chimica, dei Materiali, delle Materie Prime e Metallurgia, Università "La Sapienza", via del Castro Laurenziano 7, 1-00161 Roma, ITALY; 2: Dipartimento di Scienze dei Materiali e della Terra, Università, via Brecce Bianche, I-60131 Ancona, ITALY; 3: Istituto di Biochimica, Università, via Brecce Bianche, 1-60131 Ancona, ITALY


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