SUMMARY:Naturally occurring collagenolytic activity was found in the water‐soluble fraction of bovine muscle. General proteolytic activity determined with Azocoll indicated that this total activity was much greater than the collagenase activity specifically determined according to the method of Wünsch and Heidrich. The collagenase fraction was concentrated by polyacrylamide gel electrophoresis and the activity of the enzyme was studied under various pH and temperature conditions. This collagenase could remain active in the meat at cooking temperatures experienced in long‐time, low‐temperature cooking,70‐80°C, the collagenase observed in this study is i
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