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Decontamination of packaging by alabased photosensitization
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Resumo(s)
This study deals with the development of a novel approach to decontaminate packaging from food pathogens by photosensitization. For this purpose, packaging samples with adhered pathogen were submerged in
aminolevulinic acid (ALA solution (3-7.5 mM) for 10 min. Samples were then illuminated with 20 mW cm-2
( =400 nm) for 5-20 min up to the total exposure of 24 J cm-2. Gram-positive Bacillus cereus and Gramnegative
Salmonella enterica were inactivated, with population reductions of 4.2 and 2.5 log, respectively.
Inactivation of Gram-positive Listeria monocytogenes biofilms ranged from 1.7-3.1 log. Moreover, our data
indicated that the B. cereus spores were susceptible to this treatment, with as much as a 3.1 log reduction
in spore population observed after ALA-based photosensitization in vitro and 2.7 log on the surface of
packaging material.
Descrição
Proceedings of the International Conference “Environmentally friendly and safe
technologies for quality of fruit and vegetables”, held in Universidade do Algarve, Faro,
Portugal, on January 14-16, 2009. This Conference was a join activity with COST Action 924.