Abstract

The spectrophotometric method used to measure lactoperoxidase activity in milk was standardized. The assay system consisting of ABTS (2,2' -azinobis-(3-ethyl benzthiazoline-6-sul- phonie acid)) as chromogenie substrate gave a Iinear initial rate of reaction up to 700 ug-L:' lac- toperoxidase concentration, with maximum activity at pH 6.0. The lactoperoxidase activity was higher in buffalo milk than cow milk and the corresponding concentration of the enzyme was 31 and 24 mg-L, respectively. A loss of 10-15 % of peroxidase activity occurred on the preparation of rennet whey or acid whey. © InralElsevier, Paris lactoperoxidase assay 1cow milk 1buffalo milk 1rennet whey 1acid whey

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