• Soy protein is a viable and renewable resource for producing edible and environmentally friendly biodegradable films.
• Soy protein films need the addition of plasticizers for texture and flexibility, and glycerol and sorbitol are the ones most commonly used
• Soy protein films have poor moisture resistance and water vapor barrier ability due to the inherent hydrophilicity of the protein and the substantial amounts of hydrophilic plasticizers used to impart film flexibility