延迟冷却对钙激活酶m-calpain活性及牛肉嫩度的影响

摘要

M-calpain activities and shear force values of bovine M.longissimus from Chinese Yellow crossbred bulls were analyzed, and the effect of delay chilling on m-calpain activities and tenderness of beef during postmortem aging were studied. Results showed that delay chilling only increased m-calpain activities after postmortem aging 1h significantly (P＜0.05), but there were no significant differences between them at postmortem aging 24h and 3d(P＞0.05). Experiment results confirmed that m-calpaln didn't play the major role in the course of postmortem aging and had little contribution to the tenderness of beef.%本文通过对中国杂交黄牛(鲁西黄牛×西门塔尔)牛背最长肌中钙激活酶m-calpain活性及剪切力值的分析,研究了延迟冷却对牛背最长肌宰后成熟过程中m-calpain活性及牛肉嫩度的影响.结果表明,延迟冷却仅在宰后成熟1h,显著提高了m-calpain的活性(P<0.05);宰后成熟24h、3d时,与对照组之间差异不显著(P>0.05);试验结果证实,m-calpain在牛肉的嫩化过程中并不起主要作用,对牛肉的嫩度贡献不大.