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Abstract
An enthalpimetric method is described for the determination of peroxidase activity based on the heat produced by the peroxidase-catalysed oxidation of iodide by hydrogen peroxide. Two other electron donors, hydroquinone and ascorbic acid, were found to be less suitable as substrates. The method described allows the determination of peroxidase activity in the range 2–79 IU with an r.s.d. of 3%. A potentiostatic method in which the iodide concentration is kept constant by the automatic incremental addition of sodium thiosulphate, gave activity measurements slightly less than the enthalpimetric method.
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