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Aqueous and micellar catalysis of horseradish peroxidase was studied in a sequential injection system through selecting the oxidation by hydrogen peroxide of two phenothiazines: the water-soluble chlorpromazine and perphenazine, a low water soluble, micellised in a Tween 80 medium. The coloured free-radical intermediate formed was monitored spectrophotometrically at 527nm. The system enables the determination...
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