Facile fabrication of sandwich-like anthocyanin/chitosan/lemongrass essential oil films via 3D printing for intelligent evaluation of pork freshness

Food Chem. 2022 Feb 15:370:131082. doi: 10.1016/j.foodchem.2021.131082. Epub 2021 Sep 8.

Abstract

In this study, chitosan (CH), mulberry anthocyanin (MA), and lemongrass essential oils (LEO) were used as an interlayer using a 3D printer. Further, cassava starch (CS) was used as a protective layer to form indicator films. The indicator films containing LEO showed significant antioxidant and antibacterial properties, and the release rate of LEO increased with a rise in pH. When chilled pork spoiled, the color of the indicator films changed from red to gray-blue, and the RGB values could be automatically analyzed by a smartphone application to determine pork freshness. These films hold implications as easy-to-use indicators of meat freshness, with great potential for monitoring food spoilage, as part of an intelligent packaging system.

Keywords: Chitosan; Freshness; Lemongrass essential oil; Mulberry anthocyanin.

MeSH terms

  • Animals
  • Anthocyanins
  • Chitosan*
  • Cymbopogon*
  • Food Packaging
  • Hydrogen-Ion Concentration
  • Oils, Volatile*
  • Pork Meat*
  • Printing, Three-Dimensional
  • Red Meat* / analysis
  • Swine

Substances

  • Anthocyanins
  • Oils, Volatile
  • Chitosan