Steam treatment reduces the skin microflora population on deheaded and eviscerated whole catfish |
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| Affiliation: | 1. College of Biomedical Engineering and Instrument Sciences, Zhejiang University, Hangzhou, China;2. Interdisciplinary Center for Social Sciences, Zhejiang University, Hangzhou, China;3. Neuro and Behavior EconLab, Zhejiang University of Finance and Economics, Hangzhou, China;1. Institute of Forest Tree Improvement and Biotechnology, Vietnamese Academy of Forest Sciences, 46, Ducthang, Bac Tuliem, 10000 Hanoi, Viet Nam;2. University of Tasmania, Hobart 7001, TAS, Australia;3. Research Institute for Forest Ecology and Environment, Vietnamese Academy of Forest Sciences, 46, Ducthang, Bac Tuliem, 10000 Hanoi, Viet Nam;1. Department of Integrative Biology, University of Guelph, Ontario N1G2W1, Canada;2. Department of Microbiology, School of Pharmacy, Mansoura University, Mansoura, Egypt;3. Canadian Research Institute for Food Safety, University of Guelph, Guelph, Ontario N1G2W1, Canada;4. Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario N1G2W1, Canada |
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| Abstract: | This study tested the efficacy of steam exposures for 0, 30, 60, 90 and 120 s on reducing skin microflora of whole deheaded and eviscerated catfish. Microbiological analyses of skin were performed after treatment and on days 2, 4, 6, 8, 10 and 14 days of storage at 4°C. Catfish skin samples were examined for total (APC), coliform (CPC), and psychrotrophic (PPC) plate counts. Results indicated that as steam treatment duration increased greater reduction of catfish skin microflora was achieved. Mean bacterial counts determined on steam-treated catfish skins were significantly (P<0·05) lower than controls at all sample times. Steam treatment for 120 s was the most effective treatment modality, with APC, PPC and CPC lower than control by 2·3, 3·5 and 3·4 log cfu cm−2after 4 days of storage at 4°C. Skin APC and CPC were reduced below the limit of detection (1·8 log cfu cm−2) following a 30-s exposure, and remained at this level until day 4 of storage at 4°C. Skin PPC were reduced by 2 log cfu cm−2following 120-s steam exposure. Steam application to whole deheaded eviscerated catfish may prove useful to sanitize catfish skin prior to further processing into valuable consumer products. |
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