Development of antibacterial film based on alginate fiber, and peanut red skin extract for food packaging

An antimicrobial composite film based on sodium alginate (SA)/cellulose nanofibers (CNFs) containing peanut red skin extract (PSE) was prepared by crosslinking with Ca2+ for the purpose of fruit preservation. The bioactive chemical constituents present in PSE were investigated using liquid chromatography–mass spectrometry (LC–MS). The SA/CNFs/Ca2+/PSE (SCCP) film exhibited high strength, good water resistance, and excellent ultraviolet barrier performance. The release behavior and antioxidant and antibacterial activity of the SCCP film were investigated, and its applicability to fruit preservation was evaluated. Higher radical scavenging activity of the film was observed in the ABTS assay radical compared with the DPPH assay, especially in 10 % ethanol; the maximum ABTS scavenging activity was 99.28 %. For surfaces covered by the SCCP film, the rates of fruit decay and weight loss were lower than in the control group. Furthermore, the films exhibited significant antibacterial effects against both gram-negative and gram-positive bacteria.