A comparative study on the inactivation of Penicillium expansum spores on apple using light emitting diodes at 277 nm and a low-pressure mercury lamp at 253.7 nm

Rios de Souzaa, Vanessa; Popović, Vladimir; Warriner, Keith; Koutchma, Tatiana

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A comparative study on the inactivation of Penicillium expansum spores on apple using light emitting diodes at 277 nm and a low-pressure mercury lamp at 253.7 nm

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dc.contributor.author: Rios de Souzaa, Vanessa; Popović, Vladimir; Warriner, Keith; Koutchma, Tatiana
dc.date.accessioned: 2023-04-14T18:49:07Z
dc.date.available: 2023-04-14T18:49:07Z
dc.date.issued: 2019-12-12
dc.description.abstract - en: A comparative study was performed to assess the efficacy of UV-C light emitting diodes (UV–C LEDs) at 277 nm and a low-pressure mercury (LPM) lamp at 253.7 nm to inactivate Penicillium expansum spores on apple skin at 4 °C or 25 °C. In saline solution, the D value for the inactivation of spores using 277 nm at 25 °C was 6.62 mJ cm−2 and 7.19 mJ cm−2 at 4 °C, both of which were significantly lower than the D value at 253.7 nm (9.26 mJ cm−2). The UV-mediated inactivation of spores on the surface of apple skin followed non-linear kinetics with an initial linear phase followed by tailing. The calculated D values for spores on apple surface were significantly higher compared to within saline (14.49 and 18.80 mJ cm−2 with 277 nm at 25 °C and 4 °C, respectively, compared to 23.00 mJ cm−2 with 253.7 nm). This could be due to protective effects of apple peel constituents or the non-uniform energy distribution due to the uneven apple surface. Yet, the log reductions achieved (>2 log CFU) were equivalent to washing in hypochlorite solution (200 mg L−1 free-chlorine) which is the current industrial practice. UV-C light at 277 and 253.7 nm (500 mJ cm−2) was shown to prevent growth of blue mould and subsequent spoilage of inoculated and stored apples (28 days) if treated prior to damage. The UV-C treatments at doses corresponding to reduction of 2 log CFU of P. expansum did not impact apple physico-chemical quality parameters during 12 weeks of storage at 25 °C.
dc.identifier.citation: Rios de Souza, V., Popović, V., Warriner, K., &; Koutchma, T. (2020). A comparative study on the inactivation of Penicillium expansum spores on apple using light emitting diodes at 277 nm and a low-pressure mercury lamp at 253.7 nm. Food Control, 110, 107039. https://doi.org/10.1016/j.foodcont.2019.107039
dc.identifier.doi: https://doi.org/10.1016/j.foodcont.2019.107039
dc.identifier.issn: 1873-7129
dc.identifier.uri: https://open-science.canada.ca/handle/123456789/176
dc.language.iso: en
dc.publisher: Elsevier
dc.rights.openaccesslevel - en: Green
dc.rights.openaccesslevel - fr: Vert
dc.subject - en: Agriculture
dc.subject - fr: Agriculture
dc.subject.en - en: Agriculture
dc.subject.fr - fr: Agriculture
dc.title - en: A comparative study on the inactivation of Penicillium expansum spores on apple using light emitting diodes at 277 nm and a low-pressure mercury lamp at 253.7 nm
dc.title.fosrctranslation - fr: A comparative study on the inactivation of Penicillium expansum spores on apple using light emitting diodes at 277 nm and a low-pressure mercury lamp at 253.7 nm
dc.type - en: Article
dc.type - fr: Article
local.article.journaltitle: Food Control
local.article.journalvolume: 110
local.peerreview - en: Yes
local.peerreview - fr: Oui