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Specificity. Pyruvate is reduced at less than 2 % of the rate of an equimolar amount of hydroxypyruvate by this preparation of the enzyme. Since both pyruvate and hydroxypyruvate rapidly oxidize DPNH in the presence of lactic dehydrogenase of muscle, which is obtainable commercially (Boehringer und Soehne, Mannheim), a differential analysis of pyruvate and hydroxypyruvate in mixtures of the two substances is readily performed by a comparison of the density decrease obtained with these two enzymes either separately or consecutively in the same solution. Recovery of hydroxypyruvate. When recrystallized lithium hyproxypyruvate monohydrate (Dickens & Williamson, 1958) was used as a standard, the recovery was quantitative within the experimental limits of ± 5 % (Table 3).

The degradation of cartilage chrondroitin sulphate by the chondroitinase of Proteus vulgaris