Journal
FOOD PACKAGING AND SHELF LIFE
Volume 33, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.fpsl.2022.100871
Keywords
Smart packaging; Double-layer film; Freshness indicator; Betacyanins; Titanium dioxide nanoparticles
Categories
Funding
- National Natural Science Foundation of China [31571788]
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A double-layer film was prepared by immobilizing red pitaya betacyanins and titanium dioxide nanoparticles in locust bean gum/polyvinyl alcohol and agar/polyvinyl alcohol film matrices, respectively. The double-layer film showed good physical properties and had the ability to indicate shrimp freshness by changing color.
Double-layer film was prepared by immobilizing red pitaya betacyanins and titanium dioxide nanoparticles in locust bean gum/polyvinyl alcohol and agar/polyvinyl alcohol film matrices, respectively. Locust bean gum/polyvinyl alcohol film matrix containing red pitaya betacyanins was used as the sensing layer, while agar/polyvinyl alcohol film matrix containing titanium dioxide nanoparticles was used as the protective layer. The properties of double-layer film were measured and the film was used to indicate shrimp freshness. The double-layer film showed a thickness of 0.145 mm, water vapor permeability of 13.04 x 10(-11) g m(-1) s(-1) Pa-1 and tensile strength of 40.49 MPa. Meanwhile, the double-layer film had strong UV-Vis light barrier ability and free radical scavenging ability (28.23% at 5 mg/mL). When the double-layer film was exposed to alkaline solutions and ammonia atmosphere, it changed from initial red-violet to brown/yellow. The double-layer film showed good color stability during storage at 4 degrees C for 48 days. Notably, the double-layer film effectively indicated the spoilage of shrimp by changing film color from red-violet to pink. This study suggested the double-layer film had good color stability and a great potential in the smart packaging.
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