Changes in pH values of samples during storage under refrigeration are shown in The initial pH of fresh chickenmeat (pH 5.9) was in agreement with the results of a previous work .The pH values of control samples increased during the storage period, whereas other samples showed decreasing throughout storage probably due to the presence of acidified antimicrobial treatments such as PJ,CH and ZEO. The increasing of pH in the control samples may be due to action of endogenous or microbial enzymes such as protease and lipase that cause an increase in volatile bases during prolonged storage . Our results are in agreement with those reported for reduced-fat sausages , ready-tocook
chicken product (containing chitosan and essential oil) and cooked chicken patties (containing pomegranate
juice) . However, increasing pH values have been reported for chicken breast meat containing pomegranate juice phenolic solution during refrigerated storage.