Liha töötlemine
Oxidation does occur early in postmortem importance.
meat, and it does influence proteolysis (Harris One example of this is its ability to
et al. 2001; Rowe et al. 2004b). Rowe et al. combine with superoxide to form the highly
(2004) showed that there was a significant oxidizing molecule peroxynitrite. Proteins
increase in proteolysis of troponin-T in steaks are important biological targets of peroxyni-
from alpha-tocopherol-fed steers after 2 days trite, particularly proteins containing cyste-
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
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