Hexose shunt dehydrogenase activity in leukocytes isolated from bovine milk.

A spectrophotometric method for measuring small changes in light absorption at specific wavelengths from highly turbid suspensions of biological material (dual-beam spectrophotometry) has been used to measure glucose-6-phosphate oxidation and nicotinamide adenine dinucleotide phosphate (oxidized) reduction catalyzed by lysates of milk leukocytes. This reduction was correlated .84 with cellular protein concentration and, therefore, with cell concentration.