Antimicrobial effects of combined UV-C or gamma radiation with natural antimicrobial formulations against Listeria monocytogenes, Escherichia coli O157: H7, and total yeasts/molds in fresh cut cauliflower. (January 2016)

• Record Type: Journal Article
• Authors: Tawema, Pamphile; Han, Jaejoon; Vu, Khanh Dang; Salmieri, Stéphane; Lacroix, Monique
• Is Part Of: Lebensmittel-Wissenschaft + Technologie =. Volume 65(2016)
• Page Start: 451
• Page End: 456
• Publication Date: 2016-01
• Subjects: Food pathogens -- Natural antimicrobials -- UV light -- Gamma irradiation -- Shelf life; Food industry and trade -- Periodicals; Food -- Composition -- Periodicals; Microbiology -- Periodicals; Nutrition -- Periodicals; 664.005
• DOI: 10.1016/j.lwt.2015.08.016
• Languages: English
• ISSNs: 0023-6438

Abstract

Abstract: The aim of this study was to investigate the utilization of low doses of UV-C (5 and 10 kJ/m 2 ) and gamma irradiation (0.5 and 1 kGy) treatments combined with natural antimicrobial formulations (oregano or lemongrass essential oil plus citrus extract and lactic acid), to inhibit the growth of Listeria monocytogenes, Escherichia coli O157:H7, and total yeasts and molds, on cauliflower. Unlike the usual procedure for this type of combination, irradiation was applied before spraying of natural antimicrobial formulations with 5 ml per 100 g of cauliflower, because this approach had shown better long-term effectiveness. The combination of gamma irradiation at 1 kGy with natural antimicrobials reduced the population of L. monocytogenes as well as E. coli O157:H7 below the detection limits during the storage period. Yeasts and molds were significantly inhibited by gamma irradiation at both 0.5 and 1 kGy. The spraying of natural antimicrobial formulations following application of UV-C led to a significant inhibition of all target microorganisms. Highlights: Fresh cut cauliflower samples were used as a vegetable model. Listeria monocytogenes, Escherichia coli O157:H7, and total yeasts/molds are targets. Cauliflowers were treated by irradiation and antimicrobial formulations. γ-radiation plus formulations reduced Listeria and E. coli to undetectable limits. UV-C radiation plus formulations significantly inhibited all target microorganisms.