A comparison between E-beam irradiation and high pressure treatment for cold-smoked salmon sanitation: microbiological aspects |
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Authors: | M Medina MC Cabeza D Bravo I Cambero R Montiel JA Ordóñez M Nuñez L Hoz |
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Affiliation: | 1. Departamento Tecnología de Alimentos, INIA, Carretera de La Coruña Km 7, 28040 Madrid, Spain;2. Departamento Nutrición, Bromatología y Tecnología de los Alimentos, Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain |
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Abstract: | The effectiveness of electron beam irradiation and high pressure treatment for the sanitation of cold-smoked salmon from two points of view, microbial safety and shelf-life extension, was compared. From the response of L. monocytogenes INIA H66a to irradiation, a D value of 0.51 kGy was calculated. For samples stored at 5 °C, 1.5 kGy would be sufficient to attain a Food Safety Objective (FSO) of 2 log10cfu/g L. monocytogenes for a 35-day shelf-life, whereas 3 kGy would be needed in the case of a temperature abuse (5 °C + 8 °C). Pressurization at 450 MPa for 5 min was considered to be an insufficient treatment, since the FSO of 2 log10cfu/g L. monocytogenes was only attained for a shelf-life of 21 days at 5 °C. However, treatment at 450 MPa for 10 min achieved this FSO for samples held during 35 days at 5 °C, or during 21 days under temperature abuse (5 °C + 8 °C) conditions. Irradiation at 2 kGy kept the microbial population of smoked salmon below 6 log10cfu/g after 35 days at 5 °C, with negligible or very light changes in its odor. Pressurization at 450 MPa for 5 min also kept the microbial population below 6 log10cfu/g after 35 days at 5 °C and did not alter odor, but affected negatively the visual aspect of smoked salmon. |
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Keywords: | Cold-smoked salmon Listeria monocytogenes Irradiation High pressure FSO |
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