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Role of Leucocytes in the Reduction of Resazurin in Raw Milk¹

Dairying Laboratory, The University of British Columbia, Vancouver, British Columbia, Canada

ABSTRACT

Leucocytes, freshly isolated from bovine blood, rapidly reduced resazurin in raw milk, but these leucocytes rapidly lost activity on storage in milk at 37° C. Leucocytes isolated from raw milk had only a weak ability to reduce resazurin, and removal of leucocytes from raw milk by centrifugation had little influence on the reducing activities of the milk. Incubation of leucocytes, isolated from raw milk, with fresh bovine plasma resulted in a reactivation of the reducing powers of the leucocytes. Disintegrated leucocytes did not contribute substrates for the reducing systems of raw milk.

¹ Supported from funds from the Canada Department of Agriculture.