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Reduction of Escherichia coli O157:H7 on radish seeds by sequential application of aqueous chlorine dioxide and dry-heat treatment

Authors
Bang, J.Kim, H.Kim, H.Beuchat, L. R.Kim, Y.Ryu, J. -H.
Issue Date
10월-2011
Publisher
WILEY
Keywords
chlorine dioxide; dry-heat treatment; Escherichia coli O157:H7; radish seed
Citation
LETTERS IN APPLIED MICROBIOLOGY, v.53, no.4, pp.424 - 429
Indexed
SCIE
SCOPUS
Journal Title
LETTERS IN APPLIED MICROBIOLOGY
Volume
53
Number
4
Start Page
424
End Page
429
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/111429
DOI
10.1111/j.1472-765X.2011.03125.x
ISSN
0266-8254
Abstract
Aims: To assess the effectiveness of sequential treatments of radish seeds with aqueous chlorine dioxide (ClO2) and dry heat in reducing the number of Escherichia coli O157:H7. Methods and Results: Radish seeds containing E. coli O157:H7 at 5.5 log CFU g(-1) were treated with 500 mu g ml(-1) ClO2 for 5 min and subsequently heated at 60 degrees C and 23% relative humidity for up to 48 h. Escherichia coli O157:H7 decreased by more than 4.8 log CFU g(-1) after 12 h dry-heat treatment. The pathogen was inactivated after 48 h dry-heat treatment, but the germination rate of treated seeds was substantially reduced from 91.2 +/- 5.0% to 68.7 +/- 12.3%. Conclusions: Escherichia coli O157:H7 on radish seeds can be effectively reduced by sequential treatments with ClO2 and dry heat. To eliminate E. coli O157:H7 on radish seeds without decreasing the germination rate, partial drying of seeds at ambient temperature before dry-heat treatment should be investigated, and conditions for drying and dry-heat treatment should be optimized. Significance and Impact of the study: This study showed that sequential treatment with ClO2 and dry-heat was effective in inactivating large numbers of E. coli O157:H7 on radish seeds. These findings will be useful when developing sanitizing strategies for seeds without compromising germination rates.
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