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• W2150409226 abstract "Development in meat texture is a complex process originating very likely from a softening of the structural elements, especially myofibrils. This process probably involves two sets of mechanisms: 1) an enzymatic mechanism involving at least two of the three proteolytic systems so far identified and present in this tissue, namely lysosomal (cathepsins) and calcium dependent (calpains) proteinases; 2) a physicochemical mechanism based on the important post mortem rise in muscle osmotic pressure which could be twice as high as in live animals. Despite the large progress in muscle enzymology, the nature of the proteinases responsible for the post mortem proteolysis associated with the development in meat texture is still not clearly established. In the present review, data obtained from two different approaches attempting to answer this question were analysed. The first one was based on the identification of a set of structural and biochemical changes associated with meat texture development and to examine which proteolytic system or proteinase would be able to reproduce them when incubated with either myofibrils or muscle fibres as substrate. The second tentatively relates the rate and the extent of the changes in meat texture to the proteolytic equipment of the tissue. The first approach led to the conclusion that changes in muscle proteins and structure can be only explained by considering a synergistic action of both lysosomal and calcium-dependent proteinases. From the second, it was concluded that the process of meat texture development did not depend on the proteinase levels but was related to their initial potential efficiency assessed by measurement of the enzyme/inhibitor ratio. With respect to the physicochemical mechanisms, the post mortem rise in muscle osmotic pressure was shown to be responsible for some biochemical changes occurring in myofibrils. This was further substantiated by the fact that the greatest osmotic pressure values were observed in muscles exhibiting highest tenderising rate. On the other hand we provide evidence suggesting that the substrate, namely myofibrils, might constitute an important limiting step of the efficiency of both types of mechanism. Taken together, the findings presented emphasize that improvement of our knowledge in this field will greatly depend on the development of basic research on these different topics notably: 1) the mechanisms by which proteinases activities are regulated in living and post mortem muscles; and 2) the myofibrillar structure, especially in slow-twitch or type I muscles." @default.
• W2150409226 created "2016-06-24" @default.
• W2150409226 creator A5026007328 @default.
• W2150409226 date "1992-03-01" @default.
• W2150409226 modified "2023-10-17" @default.
• W2150409226 title "Proteolytic and physicochemical mechanisms involved in meat texture development." @default.
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