Liha töötlemine
of postmortem aging compared with steers ine, motioning, and/or tryptophan (Radi et al.
fed a conventional feedlot diet. This indicates 2000). Several enzymes are known to be
that very low levels of oxidation can influ- inactivated by peroxynitrite. Among these is
ence proteolysis and that increasing the level the sarcoplasmic reticulum Ca2+-ATPase
of antioxidants in meat may have merit in (Klebl et al. 1998). One indirect effect of
improving tenderness in future studies. In NO is S-nitrosylation. In most cases, S-
fact, low levels of oxidation may be the cause nitrosylation events involve amines and
of some heretofore-unexplained variations in thiols. Nitric oxide can interact with cyste-
proteolysis and tenderness that have been ines to form nitrosothiols that can alter the
observed in meat. activity of the protein
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