Abstract
1. 1. Methods for the preparation of stable dye-protein complexes for use in proteolytic enzymes are described. 2. 2. Indigo carmine-fibrin provides a suitable substrate for the quantitative assay of proteolytic enzymes of the pepsin type, whereas, Congo redhide powder provides a suitable substrate for the quantitative assay of proteolytic enzymes of the trypsin type. 3. 3. The dye concentration, as measured spectrophotometrically at 620 mμ, parallels the concentration of the enzymically obtained hydrolysis products as measured at 273 mμ. This suggests that the dye concentration is directly proportional to the concentration of hydrolysis products.
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