Microbiological and physicochemical properties of red claw crayf ish (Cherax quadricarinatus) stored in different package systems at 2°C

This study comapred 3 package systems for their influence on the stability of shell-on red claw crayfish tail meat stored at 2 degrees C for 14 d. Modified atmosphere packaging (MAP, with 80% CO2/10% O-2/10% N-2) suppressed (P < 0.05) the growth of aerobic bacteria and coliforms when compared with aerobic packaging using polyvinylchloride (PVCP) and vaccum packaging (VP). MAP and VP tended to retard lipid oxidation, inhibited Ca-ATPase activity change, but produced more intense protein denatuation when compared with PVCP. The MAP packaging enhanced proteolysis and resulted in more (P < 0.05) cooking looses and a higher (P < 0.05) shear force than VP and PVCP for samples stored for 6 and 14 d (P < 0.05). Sensory panel results were in general agreement with the physicochemical changes, suggesting that the specific package systems had a significant impact on the quality of refrigerated red claw crayfish raw meat.