A critical review on protein-based smart packaging systems: Understanding the development, characteristics, innovations, and potential applications.

The use of packaging in the food industry is essential to protect food and improve its shelf life. However, traditional packaging, based on petroleum derivatives, presents some problems because it is non-biodegradable and is obtained from nonrenewable sources. In contrast, protein-based smart packaging is presented as an environmentally friendly strategy that also permits obtaining packaging with excellent characteristics for the formation of smart films and coatings. This review aims to summarize recent developments in smart packaging, focusing on edible films/coatings materials, originating from animal and plant protein sources. Various characteristics like mechanical, barrier, functional, sensory, and sustainability of packaging systems are discussed, and the processes used for their development are also described. Moreover, relevant examples of the application of these smart packaging technologies in muscle foods and some innovations in this area are presented. Protein-based films and coatings from plant and animal origins have great potential to enhance food safety and quality, and reduce environmental issues (e.g., plastic pollution and food waste). Some characteristics of the packages can be improved by incorporating polysaccharides, lipids, and other components as antioxidants, antimicrobials, and nanoparticles in protein-based composites. Promising results have been shown in many muscle foods, such as meat, fish, and other seafood. These innovative smart packaging systems are characterized by their renewable and biodegradable nature, and sustainability, among other features that go beyond typical protection barriers (namely, active, functional, and intelligent features). Nonetheless, the utilization of protein-based responsive films and coatings at industrial level still need optimization to be technologically and economically valid and viable.