title: Processing and characteristics of canola protein-based biodegradable packaging: A review.
abstract: Interest increased recently in manufacturing food packaging, such as films and coatings, from protein-based biopolymers. Among various protein sources, canola protein is a novel source for manufacturing polymer films. It can be concentrated or isolated by aqueous extraction technology followed by protein precipitation. Using this procedure, it was claimed that more than 99% of protein was extracted from the defatted canola meal, and protein recovery was 87.5%. Canola protein exhibits thermoplastic properties when plasticizers are present, including water, glycerol, polyethylene glycol, and sorbitol. Addition of these plasticizers allows the canola protein to undergo glass transition and facilitates deformation and processability. Normally, canola protein-based bioplastics showed low mechanical properties, which had tensile strength (TS) of 1.19 to 4.31 MPa. So, various factors were explored to improve it, including blending with synthetic polymers, modifying protein functionality through controlled denaturation, and adding cross-linking agents. Canola protein-based bioplastics were reported to have glass transition temperature, Tg, below -50°C but it highly depends on the plasticizer content. Canola protein-based bioplastics have demonstrated comparable mechanical and moisture barrier properties compared with other plant protein-based bioplastics. They have great potential in food packaging applications, including their use as wraps, sacks, sachets, or pouches.
authors.affiliation: a Department of Food Science , University of Manitoba , Winnipeg , Manitoba , Canada.
authors.forename: Yachuan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: b Guelph Food Research Centre , Agriculture and Agri-Food Canada , Guelph , Ontario , Canada.
authors.forename: Qiang
authors.initials: Q
authors.lastname: Liu
authors.affiliation: a Department of Food Science , University of Manitoba , Winnipeg , Manitoba , Canada.|c Canola Council of Canada , Winnipeg , Manitoba , Canada.
authors.forename: Curtis
authors.initials: C
authors.lastname: Rempel
mesh_terms: D063566:Biodegradable Plastics; D001704:Biopolymers; D029741:Brassica rapa / Q000737:chemistry*; D018857:Food Packaging; D010940:Plant Proteins / Q000737:chemistry*; D010968:Plasticizers
chemical_list: D063566:Biodegradable Plastics; D001704:Biopolymers; D010940:Plant Proteins; D010968:Plasticizers
keywords: Canola protein concentrate; biodegradable packaging; biopolymers; protein isolate; thermoplastic processing