CO2冷海水结合抗氧化剂处理对南美白对虾的保鲜效果

Preservation Effects of CO2-cold Seawater Combined with Antioxidants on Litopenaeus vannamei

为研究CO2冷海水结合抗氧化剂处理对南美白对虾的保鲜效果,新鲜南美白对虾经添加抗氧化剂(2%4-己基间苯二酚组、2%植酸组、2%葡萄糖酸-δ-内酯组)的饱和CO2冷海水处理24 h,处理后于4℃贮藏,比较了贮藏过程中菌落总数、挥发性盐基氮、K值、多酚氧化酶相对活力、感官评价、pH、质构等指标的变化。结果表明,2%4-己基间苯二酚组、2%植酸组、2%葡萄糖酸-δ-内酯组抗氧化剂均可不同程度地增强CO2冷海水的保鲜效果并延长保鲜期。贮藏10 d后,CO2冷海水结合2%植酸组菌落总数、挥发性盐基氮、K值、多酚氧化酶相对活力、感官评价、pH、剪切力,依次为5.78 lg CFU/g、23.26 mg/100 g、60.45%、5.05%、5分、7.82、9.77 N;该处理保鲜效果与CO2冷海水结合2%葡萄糖酸-δ-内酯组差异不显著(p>0.05)。与对照组相比,CO2冷海水结合抗氧化剂处理后的南美白对虾货架期延长2 d,其中以植酸、葡萄糖酸-δ-内酯的效果为佳。

The aim of this study was to investigate the combined effects of CO2-cold seawater and antioxidants on the quality of Litopenaeus vannamei. Three kinds of antioxidant were dissolved in CO2-cold seawater respectively,2% 4-hexylresorcinol,2% phytic acid,and 2% lucono delta-lactone. Litopenaeus vannamei was soaked in the mixed solution for 24 h,and then refrigerated at 4 ℃. The total bacteria count,total volatile basic nitrogen,K-value,polyphenoloxidase activity,sensory evaluation,pH,and texture were determined and compared. The results indicated that the three types of antioxidants all improved the preservation effect of the CO2-cold seawater and extended the shelf life of Litopenaeus vannamei. After 16 d of storage,the values of total bacteria count,total volatile basic nitrogen,K-value,polyphenoloxidase activity,sensory evaluation,pH,and shear force of shrimps treated by CO2-cold seawater and 2% phytic acid were 5.78 lg CFU/g,23.26 mg/100 g,60.45%,5.05%,5 point,7.82,9.77 N,respectively. Compared with the treatment of CO2-cold seawater and 2% lucono delta-lactone on the preservation effects,this treatment had no significant difference(p>0.05). Compared with control group,the shelf life of these experimental groups had prolonged for 2 d,while phytic acid and lucono delta-lactone performed better.