| Autor: |
Ke Y; Department of Animal Science, Oklahoma State University , Stillwater, Oklahoma 74078, United States., Mitacek RM; Department of Animal Science, Oklahoma State University , Stillwater, Oklahoma 74078, United States., Abraham A; Department of Animal Science, Oklahoma State University , Stillwater, Oklahoma 74078, United States., Mafi GG; Department of Animal Science, Oklahoma State University , Stillwater, Oklahoma 74078, United States., VanOverbeke DL; Department of Animal Science, Oklahoma State University , Stillwater, Oklahoma 74078, United States., DeSilva U; Department of Animal Science, Oklahoma State University , Stillwater, Oklahoma 74078, United States., Ramanathan R; Department of Animal Science, Oklahoma State University , Stillwater, Oklahoma 74078, United States. |
| Abstrakt: |
Mitochondria play a significant role in beef color. However, the role of oxidative stress in cytochrome c release and mitochondrial degradation is not clear. The objective was to determine the effects of display time on cytochrome c content and oxidation-reduction potential (ORP) of beef longissimus lumborum (LL) and psoas major (PM) muscles. PM discolored by day 3 compared with LL. On day 0, mitochondrial content and mitochondrial oxygen consumption were greater in PM than LL. However, mitochondrial content and oxygen consumption were lower (P < 0.05) in PM than LL by day 7. Conversely, cytochrome c content in sarcoplasm was greater on days 3 and 7 for PM than LL. There were no significant differences in ORP for LL during display, but ORP increased for PM on day 3 when compared with day 0. The results suggest that muscle-specific oxidative stress can affect cytochrome c release and ORP changes. |
