Chitosan-based multifunctional coating combined with sulfur quantum dots to prevent Listeria contamination of enoki mushrooms. (March 2023)

• Record Type: Journal Article
• Authors: Min, Seungjae; Priyadarshi, Ruchir; Ezati, Parya; Rhim, Jong-Whan; Kim, Jun Tae
• Is Part Of: Food packaging and shelf life. Volume 35(2023)
• Publication Date: 2023-03
• Subjects: Sulfur quantum dots -- Chitosan -- Antimicrobial -- Antioxidant -- Listeria monocytogenes -- Enoki mushrooms; Food -- Packaging -- Periodicals; Food -- Preservation -- Periodicals; Food -- Packaging; Periodicals; 664.0905
• DOI: 10.1016/j.fpsl.2022.101014
• Languages: English
• ISSNs: 2214-2894

Abstract

Abstract: A chitosan-based multifunctional coating solution was prepared by adding sulfur quantum dots (SQDs) to secure the safety of enoki mushrooms by circumventing L. monocytogenes infection. The chitosan-based coating solutions with various concentrations of SQDs (0, 1, 2, and 3 wt% with respect to chitosan) were cast into flexible films to test their physicochemical and functional characteristics. The SQD-added films showed excellent UV-blocking properties, but their transparency was significantly decreased. The incorporation of SQDs significantly enhanced the mechanical stability (by 15.8–29.7%) without significantly changing the chitosan film's water vapor transmission characteristics and considerably increased the antioxidant activities (up to 273% and 169% of DPPH and ABTS radical scavenging efficacies, respectively). The SQD-added film showed significantly increased antimicrobial activity against E. coli and L. monocytogenes . When the coating solution was applied to the enoki mushrooms, no substantial change was observed in the appearance of the coated mushrooms. The chitosan/SQD 3% coating solution effectively prevented Listeria contamination of enoki mushrooms and eradicated 100% of the inoculated bacterial colonies within 6 days. Highlights: Chitosan-based functional films were prepared by adding sulfur quantum dots (SQDs). SQDs increased their strength, UV-barrier, antioxidant and antimicrobial properties. Enoki mushrooms were coated with chitosan/SQD solution to secure their safety. Shelf life of mushrooms could be extended by preventing L. monocytogenes growth.