Xanthine Oxidase Activity in Dairy Products

Abstract
Xanthine oxidase activities were measured in a variety of milk and dairy products. Bulk raw milks, as received at a commercial plant, had an average xanthine oxidase activity of 110 m U[units]/ml. Homogenization inactivated more than half of the xanthine oxidase and when packaged, these milks averaged 34 mU/ml. Twenty-five varieties of cheese exhibited xanthine oxidase activities ranging from 0-340 mU/g. Data are presented for enzyme activities in a variety of other dairy products.

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