Preparation of DCNC chemically cross-linked CMC/PVA composite film for sustainable and strawberry preservation active packaging

In recent years, with the increasing attention to food safety and environmental protection, the development of biodegradable food packaging materials with comprehensive performance has become a hotspot. This article presents the preparation of a polyvinyl alcohol carboxymethyl cellulose composite film with barrier property. This study utilized formaldehyde nanocellulose as a crosslinking agent to chemically modify composite membranes. Further promote its application in food preservation. The mechanical properties and barrier properties of formaldehyde cellulose (DCNC) polyvinyl alcohol (PVA) carboxymethyl cellulose (CMC) composite films were studied. Apply the prepared DCNC/PVA/CMC composite film to strawberry preservation experiments. The results showed that cross linked modified composite film can more effectively reduce indicators such as weight loss rate, titratable acid content and ascorbic acid content of strawberries, thus effectively prolonging strawberry shelf life by 4 days. This indicates that modified composite films have certain potential application value in the field of food packaging.