Development of multifunctional food packaging films based on chitosan, TiO2 nanoparticles and anthocyanin-rich black plum peel extract

Abstract: Abstract In this study, chitosan (CS), silver nanoparticles (Ag NPs), and blueberry anthocyanins (BA) were used as substrates to prepare smart antibacterial films with visual responsiveness. In order to improve the antimicrobial and mechanical properties of polysaccharide‐based films, stable silver polylysine nanoparticles (PLL‐Ag NPs) with favorable antibacterial effect were biosynthesized and incorporated into CS films. Compared with pure CS films, CS‐silver nanoparticles (CS‐Ag) films showed increased mechanical resistance, reduced moisture content, and water vapor permeability. Furthermore, their antioxidant and antibacterial properties were significantly enhanced: the antioxidant capacity had increased by approximately six times, while the antibacterial rates against Escherichia coli (E. coli) and Staphylococcus aureus ( S. aureus ) rose from 55 ± 3% and 8 ± 2% to 98 ± 2%, and 97 ± 2%, respectively. After the addition of BA, the resulting CS‐BA‐Ag films displayed pH sensitivity, exhibiting easily distinguishable colors at different pH values. Subsequently, CS‐BA‐Ag NPs films were applied to preserve and monitor the freshness of fresh pork. The results demonstrated that the CS‐BA‐Ag films could effectively reflect pork freshness through color changes and extend its shelf life by 4–6 days compared to control films. Therefore, CS‐BA‐Ag film is a promising smart film with pH‐response and high antibacterial activity in the field of food preservation.

TL;DR: Colorimetric sensors are used to detect changes in color due to the presence of specific analytes in food, enabling quality and safety control.

TL;DR: In this article , a biodegradable indicator film which was made by combining cellulose-nanofiber/chitosan dyed with methyl red synthesis (CCM) as a pH indicator film and followed by a single layer coating of polylactic acid (PLA) on its surface, named PLA/CCM film.

TL;DR: Several applications of nanomaterials in food packaging and food safety are reviewed, including polymer/clay nanocomposites as high barrier packaging materials, silver nanoparticles as potent antimicrobial agents, and nanosensors and nanomMaterial-based assays for the detection of food-relevant analytes.

TL;DR: In this paper, the authors summarized recent research dealing with development of titanium dioxide (TiO2) used for environmental applications and suggested new research directions, including preparation aspects for the development of this promising material.

TL;DR: A review of advances in polysaccharide-based films and coatings for food packaging can be found in this article, where the authors summarized the advances in the development of biodegradable packaging films.

TL;DR: This review discusses the application of chitosan and its blends with other natural polymers such as starch and other ingredients for example essential oils, and clay in the field of edible films for food protection.