Myofibrillar ATPase and lactate dehydrogenase (LDH) activitieswere determined at 1 hour of ageing time (because these enzymes exhibit activity only in the early hours post mortem),pH values and decline rate were measured every hour, from 1 hour up to 24 hours of ageing time, cathepsins activities were determined at 1, 10, 24 hours 6 and 8 days; after reaching the appropriate ageing times, samples for cathepsins activities were stored at -80C until analysis (within two weeks), myofibrillar toughness was performed only SM and ST muscles (because muscle L did not reach the thickness of 1cm required to make this determination) at 1, 6 and 8 days.
2a.shows the values of myofibrillar ATPase activity, which correspond to the speed of contraction of the muscle.
Conclusions: According to the enzymatic activity of LDH and myofibrillar ATPase, pHu and the rate of pH decline, the SM and L muscles of this species presented a predominantly glycolytic metabolism and a fast rate of contraction, so they may be considered as fast white muscles".
Hence, denature or structural changes in myofibril would affect myofibrillar ATPase activity, and which could be an indicator of the modification of the actin-myosin interaction and the degree of myofibrillar structure aging (Quali, 1984; Nishiwaki et al., 1996).
Caponization however significantly (p<0.05) decreased the ash, myofibrillar ATPase activity and emulsifying capacity.
Caponization decreased (p<0.05) the myofibrillar ATPase activity.
Therefore, lack of androgen in capons may change the myofibril structure or types of myosin that influence myofibrillar ATPase activity and emulsifying capacity of the capon meat.
Myofibrillar ATPase activity of Chinese-style semi-dry sausage as affected by curing time and sugar concentration.