复配生物涂膜保鲜液对冷藏南美白对虾的保鲜效果研究

Study on the preservative effect of compound biological coating liquid on frozen South American white prawn

中文关键词:  南美白对虾  复配生物保鲜液  涂膜  腐败  货架期

英文关键词:South American white prawn  compound biological preservation liquid  coating  corruption  shelf life

中文摘要:

      目的 探究复配生物涂膜保鲜液对冷藏南美白对虾的保鲜效果。方法 以新鲜南美白对虾为原料, 通过单因素实验考察壳聚糖、海藻酸钠、明胶及乳酸链球菌素(Nisin)对冷藏南美白对虾货架期的作用。在此基础上优化壳聚糖、海藻酸钠及Nisin所组成的复配涂膜保鲜液的最适配比。结果 壳聚糖6 g/L、海藻酸钠8 g/L、Nisin 0.4 g/L组成的最佳配比复合保鲜液涂膜南美白对虾后冷藏保存, 冷藏期限可以达到12 d, 测得pH值为7.52, 感官评分为3分, 比对照组延长了6 d。结论 南美白对虾涂膜复合保鲜液后, 更能隔绝外界接触, 抑制细菌繁殖, 从而延缓虾肉的腐败变质, 具有更好的保鲜效果, 为进一步研究南美白对虾货架期与特定腐败微生物关系奠定理论基础。

英文摘要:

      Objective To explore the the preservation effect of compound biocoated preservation liquid on frozen South American white prawn. Methods The effects of chitosan, sodium alginate, gelatin and Nisin on shelf life of South American white prawn were investigated by single factor experiment. On this basis, the optimum ratio of the coating fresh-keeping solution composed of chitosan, sodium alginate and Nisin was optimized. Results The best ratio of chitosan 6 g/L, sodium alginate 8 g/L and Nisin 0.4 g/L was coated with a composite preservative and stored in cold storage. The refrigerating period could reach 12 days, the measured pH value was 7.52, and the sensory score was 3, which was 6 days longer than the control group. Conclusion After coating the South American white prawn with the compound preservative, it can isolate the external contact and inhibit the reproduction of bacteria, thus delaying the putrid and deterioration of the shrimps and having better fresh-keeping effect. This study provides a theoretical basis for further research on the relationship between shelf life and specific putrefied microorganisms in South American white prawn.