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Changes in pH, Temperature, R-values and Calpain Activity of M. longissimus from Hanwoo Steer during Rigor Development  

Kim, Jin-Hyoung (National Livestock Research Institute, RDA)
Kim, Hak-Kyun (Danyang Agrotechnology)
Park, Beom-Young (National Livestock Research Institute, RDA)
Cho, Soo-Hyun (National Livestock Research Institute, RDA)
Hwang, In-Ho (National Livestock Research Institute, RDA)
Kim, Dong-Hun (National Livestock Research Institute, RDA)
Lee, Jong-Moon (National Livestock Research Institute, RDA)
Publication Information
Food Science of Animal Resources / v.25, no.3, 2005 , pp. 310-315 More about this Journal
Abstract
The changes in pH, temperature, R-values and ${\mu}-calpain$ and its inhibitor activity of M. longissimus from Hanwoo steer were investigated at 1, 3, 9 and 24h postmortem. The pH and temperature of M. longissimus were significantly (p<0.05) decreased during 24h postmortem time, and were 6.50 and $31.99^{\circ}C$, respectively, at 3h postmortem. $R_{248}\;and\;R_{250}$ were increased, but $R_{258}$ was decreased after 9h postmortem time (p<0.05). Calpain I and calpastatin activity were decreased after 3h and 9h postmortem time, respectively (p<0.05). pH and temperature showed high positive correlations with $R_{258}$ (r=0.967 and r=0.970, respectively), calpain I (r =0.956 and r=0.954, respectively) and calpastatin (r=0.978 and r=0.986, respectively) but had high negative correlations with $R_{248}$ (r=-0.982 and r=-0.973, respectively) and $R_{248}$ (r=-0.983 and r=-0.976, respectively). from these results, the change of postmortem metabolism of M. longissimus from Hanwoo steer likely occurred after 9h postmortem time. However, the further study on the establishment of metabolism from Hanwoo between postmortem 3h and 9h are necessary to produce Hanwoo beef with high acceptance in meat quality.
Keywords
Hanwoo steer; postmortem; pH; temperature; R-values;
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