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- Title
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.; Beuchat, L.R.; Kim, Y.; Ryu, J.-H.
- 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 μg ml−1 ClO2 for 5 min and subsequently heated at 60°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.
- Subjects
SEED microbiology; DRYING; HEAT as a disinfectant; ESCHERICHIA coli; RADISHES; CHLORINE dioxide; GERMINATION; TEMPERATURE effect
- Publication
Letters in Applied Microbiology, 2011, Vol 53, Issue 4, p424
- ISSN
0266-8254
- Publication type
Article
- DOI
10.1111/j.1472-765X.2011.03125.x