Abstract
This study aimed to evaluate the effects of different cooking time (2, 4, and 6 h) and temperature (50, 60, 70, 80, and 90 °C) on physical, textual, and structural properties of longissimus lumborum muscle of yak, and to explore the thermal denaturation process of intramuscular collagen by using a new tool (collagen hybridizing peptide staining, CHP staining). The results showed that tenderness was affected by the interaction of cooking time and temperature and the changes in moisture and collagen composition. In comparison with cooking time, temperature had more obvious effects on cooking loss, moisture content and redness. Scanning electron microscopy showed that as the temperature increased, intramuscular connective tissue gradually degraded, and muscle fibers became more compact. CHP staining showed that the collagen in the perimysium first denatured at 50 °C, and more and more collagen denatured and degraded as the temperature increased.
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