THE REDUCTION OF HYDROGEN PEROXIDE BY FIBRIN

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Abstract
It has previously been reported by Jaques that fibrinogen and fibrin possess marked reducing powers. In a further investigation of this property, the reduction of hydrogen peroxide by these proteins has been studied. Commercial fibrin sometimes contains large amounts of catalase. Methionine in phosphate buffer reduces hydrogen peroxide at pH 6.6 and temperature of 25 °C. This reduction is increased by copper and molybdate. The reduction of hydrogen peroxide by fibrinogen and fibrin free of catalase is due to the methionine residue.