| Literature DB >> 22055942 |
M Koohmaraie1, S C Seidemann, J E Schollmeyer, T R Dutson, J D Crouse.
Abstract
Post-mortem changes in two calcium-dependent proteases, their inhibitor, myofibril fragmentation index (MFI) and collagen (amount and solubility) were studied. Whereas the activity of high Ca(++)-requiring calcium-dependent protease (CDP-II) remained nearly constant throughout post-mortem storage, there was a progressive decrease in the activities of low Ca(++)-requiring calcium-dependent protease (CDP-I) and their specific inhibitor, with the inhibitor being the most susceptible to post-mortem storage. Results indicated that the greatest changes in MFI occur within the first 24 h of post-mortem storage. There were no detectable changes in either total or soluble collagen content with post-mortem storage. Hence, it was concluded that improvement in tenderness resulting from post-mortem storage must be derived from changes in the myofibrils and since CDP-I activities paralleled the myofibrillar changes, it seems reasonable to suggest that CDP-I, not CDP-II, plays an important role in the fragmentation of myofibrils and consequently in improvement of meat tenderness resulting from post-mortem storage.Entities:
Year: 1987 PMID： 22055942 DOI： 10.1016/0309-1740(87)90056-8
Source DB: PubMed Journal: Meat Sci ISSN： 0309-1740 Impact factor: 5.209