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Survival of Listeria innocua in Salmon following Cold-Smoke Application

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The ability of Listeria innocua to survive on salmon fillets during cold smoking in a commercial processing plant was investigated using a central composite rotatable response surface design to examine smoking temperatures in the range of 18 to 30°C and a smoke time from 2 to 14 h. Smoke temperature did not significantly (P < 0.05) reduce counts of L. innocua on the salmon. However, the smoking time had a significant effect on L. innocua. The smoking time was directly related to the reduction in count (R 2 = 0.831), and a 3-log cycle reduction in count was observed when the smoking time was 12 h. The reduction in L. innocua levels on the fish was unaffected by the pH, water activity, and salt concentration of the fillet.

Document Type: Research Article

Affiliations: 1: Department of Food Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada; Fish, Seafood & Production Division, Canadian Food Inspection Agency, 59 Camelot Drive, Nepean, Ontario K1A 0Y9, Canada 2: Health Canada, 110 Stone Road West, Guelph, Ontario N1G 3W4, Canada 3: Department of Food Science, University of Guelph, Guelph, Ontario N1G 2W1, Canada

Publication date: June 1, 2000

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