Study of intelligent antibacterial and antioxidant poly(vinyl) alcohol film on the fresh-keeping effect and quality dynamic monitoring of Pseudosciaena crocea.

In this study, 1% nano-TiO2 and 3% anthocyanin were incorporated into poly(vinyl) alcohol, and the intelligent poly(vinyl) alcohol packaging film was prepared by solution casting method. In order to study the effect of the packaging film on the storage quality of Pseudosciaena crocea, the indexes of TBA, total bacteria and pH were used to evaluate the freshness of Pseudosciaena crocea during refrigerated storage. The visible dynamic color changes of the film due to the change of pH value of Pseudosciaena crocea fish meat was also studied to discuss the freshness preservation and quality dynamic monitoring ability of intelligent poly(vinyl) alcohol packaging film. The results showed that the TBA, total bacteria and pH values of the PVA-nano-TiO2-anthocyanin film packaged group were better than those of the unpackaged and pure PVA film packaged groups. The total number of bacteria at the 16th day of storage reached 7.11 lg cfu/g for PVA-nano-TiO2-anthocyanin film packaged group, compared with 7.14 lg cfu/g and 7.03 lg cfu/g on the 12th day of storage in other experimental groups, the shelf life was extended 4 days. During the 20 days storage period, the poly(vinyl) alcohol-nano-TiO2-anthocyanin film can well responded with the changes of pH values of Pseudosciaena crocea fish meat by visible color changes. Therefore, the intelligent poly(vinyl) alcohol packaging film prepared in this study can not only have beneficial effects on the preservation of foods, but also can serve as a color indicator to achieve intelligent monitoring in the food storage process.