Preparation of functional degradable antibacterial film and application in fresh-keeping of grass carp

Abstract

To explore new, green and effective low-temperature preservation technology, β -cyclodextrin ( β -CD) embedded Elsholtzia essential oil (EEO) was used as an antibacterial agent, and polybutylene adipate- co -terephthalate (PBAT) and polylactic acid (PLA) were used as the base material to extend grass carp fillets shelf life. Active antibacterial PBAT/PLA, PBAT/PLA-EEO, and PBAT/PLA- β -CD els films were prepared using a casting film-forming process. The changes in total viable count (TVC), pH, total volatile basic nitrogen (TVB-N), and thiobarbituric acid-reactive substances values of grass carp fillets during storage at 4 °C were studied. The results showed that, compared with the PBAT/PLA film, the oxygen transmission rate of PBAT/PLA- β -CD els decreased from 868.02 to 566.80 cm 3 m 2 •24 h•0.1 MPa −1 . During preservation, compared with the PBAT/PLA film, the PBAT/PLA- β -CD els film effectively lowered TVC and delayed TVB-N production. The results revealed that PBAT/PLA- β -CD els film with β -CD-embedded EEO positively affected grass carp quality maintenance and extended its shelf life. Overview of the experiments. PLA pellets and PBAT pellets were blended with β -CD els . After the modified resins were prepared using a single-screw plastic extrusion device to obtain active films. Then apply it to the preservation of grass carp. • We explored a new, green, and effective low-temperature preservation technology. • β -cyclodextrin-embedded Elsholtzia essential oil was used as an antibacterial agent. • Polybutylene adipate- co -terephthalate and polylactic acid were used as a base. • Fresh-keeping was assessed in grass carp fillets preserved in β -CD-embedded EEO. • The film with positively affected grass carp quality and extended its shelf life.