The relationship between muscle pH, temperature, and rigor onset is critical in the development of pale, soft, exudative (PSE) pork. The PSE condition is caused by a rapid rate of postmortem glycolysis during the early postmortem period (35 c), resulting in excessive protein denaturation and inferior meat quality attributes. In particular, PSE has a higher degree of myoWbrillar protein denaturation compared to normal muscle. The PSE condition is more likely to develop in white muscles than red muscles. This is most likely the result of white, fast-twitch Wbers having a more rapid pH decline than red Wbers due to their inherently higher ATPase capacity and glycolytic nature. DiVerences in the inhere susceptibility of various muscle Wbers types to myoWbrillar protein denaturation may also account for the diVerential meat quality attributes between red and white muscles.
The relationship between muscle pH, temperature, and rigor onset is critical in the development of pale, soft, exudative (PSE) pork. The PSE condition is caused by a rapid rate of postmortem glycolysis during the early postmortem period (<1 h). Numerous studies have shown that a rapid metabolism results in a low muscle pH while the carcass temperature is still high (>35 c), resulting in excessive protein denaturation and inferior meat quality attributes. In particular, PSE has a higher degree of myoWbrillar protein denaturation compared to normal muscle. The PSE condition is more likely to develop in white muscles than red muscles. This is most likely the result of white, fast-twitch Wbers having a more rapid pH decline than red Wbers due to their inherently higher ATPase capacity and glycolytic nature. DiVerences in the inhere susceptibility of various muscle Wbers types to myoWbrillar protein denaturation may also account for the diVerential meat quality attributes between red and white muscles.
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