Fog, phenolic acids and UV-A light irradiation: A new antimicrobial treatment for decontamination of fresh produce

Food Microbiology
Andrea CossuNitin Nitin

Abstract

This study evaluates synergistic interactions of food grade phenolic acids (gallic and ferulic acid) and UV-A light to achieve decontamination of fresh produce using a fog to improve dispersion of the phenolic acids on produce surface. Nonvirulent strains of Escherichia coli O157:H7 and Listeria innocua were used as model bacteria and spinach was selected as a model fresh produce. Synergistic combination of a fog deposited phenolic acid and a UV-A light treatment achieved reduction in bacterial plate count up to 2 log CFU/cm2 independently of the initial load of the bacteria (104 or 106 CFU/cm2). Following the treatment, fog deposited gallic and ferulic acid could be easily removed from the surface of produce by immersion in water and the treatment did not significantly alter the total endogenous phenolic content of spinach. The treatment also did not affect the texture, but impacted the color of the spinach leaves on a Hunter's Lab scale although the visual color changes were small. Overall, this technology may aid in developing alternative approaches for decontamination processes using food grade compounds.

References

Oct 18, 2000·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·C LeclercqA Turrini
Oct 27, 2005·Journal of Agricultural and Food Chemistry·N PandjaitanM I Gil
Sep 20, 2011·Food Microbiology·Anne-Laure MoyneLinda J Harris
Jul 28, 2015·International Journal of Environmental Research and Public Health·Jennifer L BanachH J Ine van der Fels-Klerx

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