Abstract
2,4,5-trihydroxybutyrophenone (2,4,5-THBP), in the presence of hydrogen peroxide (H 2 O 2 ), is a substrate for horseradish peroxidase (HRP) with a Km value of 2.5 mM. An intermediate red product(s), probably 2,4,5-THBP quinone, characterized by a peak at 490-500 nm, was detected and the time course of its conversion to the final red product(s) was studied. The relationships between the rate of 2,4,5-THBP oxidation to pigmented product(s) as a function of various concentrations of H 2 O 2 , 2,4,5-THBP and HPR are described.
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