Efficacy of cold plasma functionalised water for improving microbiological safety of fresh produce and wash water recycling

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Title: Efficacy of cold plasma functionalised water for improving microbiological safety of fresh produce and wash water recycling
Authors: Patange, ApurvaLu, PengBoehm, DanielaCullen, P. J.Bourke, Paula
Permanent link: http://hdl.handle.net/10197/12625
Date: Dec-2019
Online since: 2021-11-10T17:01:32Z
Abstract: Atmospheric cold plasma (ACP) is an effective method for microbiological decontamination. This study evaluated an alternative water-based decontamination approach for inactivation of bacterial population from fresh produce and in the wash water generated from fresh produce washing. The study characterised ACP inactivation of attached Listeria innocua and Pseudomonas fluorescens inoculated on lettuce in comparison to chlorine treatment. P. fluorescens was sensitive to ACP treatment and was reduced below detection limit within 3 min of treatment. L. innocua population was reduced by ∼2.4 Log10 CFU/g after 5 min of treatment; showing similar inactivation efficacy to chlorine treatment. The microbial load in wash water was continuously decreased and was below detection limits after 10 min of ACP treatment. Micro-bubbling along with agitation assisted the bacterial detachment and distribution of reactive species, thus increasing bacterial inactivation efficacy from fresh produce and wash water. A shift in pH of plasma functionalised water was observed along with high concentration of nitrate and ozone with a relative amount of nitrites which increased with plasma exposure time. Further, L. innocua treated at different independent pH conditions showed minimal or no effect of pH on ACP bacterial inactivation efficacy. Aqueous ACP treatment poses a promising alternative for decontamination of fresh produce and the associated wash-waters which could be applied in the food industry to replace continuous chlorine dosing of process waters.
Funding Details: Department of Agriculture, Food and the Marine
Science Foundation Ireland
Type of material: Journal Article
Publisher: Elsevier
Journal: Food Microbiology
Volume: 84
Copyright (published version): 2019 Elsevier
Keywords: Aqueous atmospheric cold plasmaMinimally processedWash-water treatmentMicrobial decontaminationEnterica serovar typhimuriumAtmospheric pressure plasmaNonthermal plasmaFood industryListeria MonocytogenesInactivationDisinfectionBacteriaFruits
DOI: 10.1016/j.fm.2019.05.010
Language: en
Status of Item: Peer reviewed
ISSN: 0740-0020
This item is made available under a Creative Commons License: https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Appears in Collections:Biosystems and Food Engineering Research Collection

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