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Quantitative measurements of O2∸ (A) and H2O2 (B) in the xanthine oxidase system containing 0.1 mM xanthine and 2 mU/ml xanthine oxidase. Superoxide formation was assayed as SOD-inhibitable formation of 3-carboxy-proxyl (CP), while H2O2 was detected by peroxidase-acetamidophenol-mediated co-oxidation of CPH to CP-nitroxide, which was inhibited by catalase (20 µg/ml).
