Effect of chitosan with different molecular weight on preservation of Tilapia Fillets during cold storage

In this article,the preservative effects of chitosan with different molecular weight on cold storage of Tilapia Fillets were studied. The sensory evaluation value,the total count of bacteria colonies,p H,volatile basic nitrogen( TVB-N value) and freshness indicators( K value) of Tilapia Fillets were measured during cold storage at 4 ℃.The results showed that the sensory evaluation value of Tilapia Fillets treated with chitosan decreased slowly,and their total count of bacteria colonies,p H,TVB- N value,K value were lower than those of the control group.The self- life of Tilapia Fillets could be extended 1 ~ 3 days during cold storage. The Tilapia Fillets treated with lower molecular weight chitosan( 4 ku) had a better preservative effect.