The effect of pomegranate peel extract (PPE) (methanolic) on the enzyme polyphenol oxidase (PPO)
activity and quality of Pacific white shrimp (Litopenaeus vannamei) during refrigerated storage of 10 days
was investigated. The inhibitory activity of PPE toward the PPO of shrimp appeared to follow a dosedependent manner. With storage, treating the shrimp with either 1 g/100 mL or 2 g/100 mL PE solution could appreciably retard the mesophilic, psychrophilic, lactic acid bacteria (LAB) and enterobacteriaceae counts (P < 0.05). With storage also, treating the shrimp with PE solution at both levels
could significantly decrease the total volatile basic nitrogen (TVB-N), trimethylamine (TMA) and thiobarbituric acid (TBA) (P < 0.05). By day 6, PPE-treated shrimp obtained lower melanosis score but by day
10, odor, texture, color as well as overall likeness received higher sensory scores. Hence, the PPE could
serve as a preservative method as well as melanosis inhibitor of shrimp and could substitute for sodium
metabisulphite
کلید واژگان :
Pomegranate peel extract Pacific white shrimp Litopenaeus vannamei Polyphenol oxidase
