Preparation And Application Of Chitosan/Gelatin Active Film

Active edible films prepared from natural biomacromolecules have been the focus of recent research in the field of food packaging.The active edible film has rich nutrition and can be eaten together with food;Gas is blocked,waterproof and antifogging,and can be degraded by environment;Has the advantages of good mechanical property,stable property,convenient processing and production and the like.In this study,chitosan-gelatin was used as substrate to prepare active membrane.The active film was used as the sealing package of fresh-cut pitaya to study its fresh-keeping effect.So as to prepare an active film with fresh-keeping effect.The main conclusions of this research are listed below.The optimum ratio of gelatin to chitosan was 1:1.the tensile strength,elongation at break and water solubility of the film were 20.19 MPa,40.08%and 19.11%,respectively.On the basis of single factor,the mass concentration of tributyl citrate,glycerol and tween-20 was selected as independent variables,and the optimal film-making process was optimized by response surface methodology.the optimal ratio of tributyl citrate,glycerol and tween-20 was 0.9%,0.3%and 0.1%,respectively.By studying the effect of active film on fresh-cut pitaya,it was found that active film could prolong the storage period of fresh-cut pitaya from 6d to 12d.And effectively delay that decrease of the hardness,soluble solid matter,titratable acid,vitamin c content and total phenol content of the fresh-cut pitaya fruit in the storage period.The activity of pod,SOD and cat was kept high,and the synthesis of physiological metabolism products of pitaya was reduced,which effectively delayed the spoilage of fresh-cut pitaya.