A Konjac Glucomannan/ Gelatin-Based Film with Ginger Essential Oil and Rosemary Essence Oil: Preparation, Characterization, and Application in Sea Bass (Lateolabrax Maculatus) Packaging

Abstract

In this study, a konjac glucomannan (KGM)/ gelatin (GEL)-based film integrated with ginger essential oil (GEO) and rosemary essence oil (REO)-loaded bacterial cellulose was prepared. The synergistic combination of GEO and REO were evaluated. The physicochemical, mechanical, optical, morphological, antibacterial, antioxidant properties and preservation effects of the composite films were characterized. Results demonstrated that REO and GEO exhibited synergistic antibacterial activity when the mixture of GEO and REO at 3:1 ratio. FT-IR results showed that the formation of some interaction between the film matrix and essential oils (EOs), SEM and AFM showed that the components of the film had good compatibility, and CLSM manifested that the EOs were uniformly distributed in active film, and the addition of EOs improved the mechanical, UV-barrier, antibacterial and antioxidant properties of the active film. Besides, the KGB-0.8 film could maintain the quality of refrigerated sea bass and extend the shelf-life for another 6 days.

Keywords: Konjac glucomannan, Gelatin, Bacterial cellulose, Active film, Lateolabrax maculatus