Liha töötlemine
muscle metabolism and thus represent an under postmortem-like conditions inhibits
important avenue of future research. calpain activity (Carlin et al. 2006). In a
In postmortem muscle, these redox series of in vitro assays using either a fluo-
systems may also play a role in influencing rescent peptide or purified myofibrils as the
meat quality. The proteolytic enzymes, the substrate it was shown that the presence of
calpains, are implicated in the proteolysis oxidizing species does significantly impede
Chemistry and Biochemistry of Meat 19
the ability of calpains to degrade their sub- (NOS). There are three major isoforms of
strates. Oxidation with H2O2 significantly NOS: neural, inducible, and endothelial.
limits proteolytic activity of μ- and m-calpain Skeletal muscle expresses all three isoforms;
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