Journal
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
Volume 172, Issue -, Pages 231-240Publisher
ELSEVIER
DOI: 10.1016/j.ijbiomac.2021.01.056
Keywords
Photodynamic inactivation (PDI); Chitosan; Riboflavin; Antibacterial; Food packaging
Funding
- National Key R&D Programof China [2018YFC1602205, 2018YFC1602200]
- Plan of Action for Scientific and Technological innovation of Science and Technology Commission of Shanghai Municipality [19391901600]
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The study successfully applied Photodynamic Inactivation (PDI) technology to food packaging using chitosan films containing riboflavin, resulting in composite films with improved properties. The addition of riboflavin not only enhanced the film characteristics, but also generated sufficient singlet oxygen to inactivate food-borne pathogens and spoilage bacteria.
Photodynamic inactivation (PDI) is a novel sterilization technology that has proven effective in medicine. This study focused on applying PDI to food packaging, where chitosan (CS) films containing photosensitizing riboflavin (RB) were prepared via solution casting. The CS-RB composite films exhibited good ultraviolet (UV)-barrier properties, and had a visually appealing highly transparent yellow appearance. Scanning electron microscopy (SEM) confirmed even dispersion of RB throughout the CS film. The addition of RB led to improved film characteristics, including the thickness, mechanical properties, solubility, and water barrier properties. The CS-RB5 composite films produced sufficient singlet oxygen under blue LED irradiation for 2 h to inactivate two food-borne pathogens (Listeria monocytogenes and Vibrio parahaemolyticus) and one spoilage bacteria (Shewanella baltica). The CS-RB composite films were assessed as a salmon packaging material, where inhibition of bacterial growth was observed. The film is biodegradable, and has the potential to alleviate the issues associated with the excessive use of petrochemical materials, such as environmental pollution and limited resources. The CS-RB composite films showed potential as a novel environmentally friendly packaging material for shelf-life extension of refrigerated food products. (C) 2021 Elsevier B.V. All rights reserved.
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