Inactivation by ionizing radiation of Salmonella enteritidis, Salmonella infantis, and Vibrio parahaemolyticus in oysters (Crassostrea brasiliana).
Irradiation is considered one of the most efficient technological processes for the reduction of microorganisms in food. It can be used to improve the safety of food products, and to extend their shelf lives. Oysters are considered one of the most important vehicles for pathogenic bacteria because of their feeding characteristics. The aim of this study was to evaluate the influence of a gamma radiation process on high levels of Salmonella Enteritidis, Salmonella Infantis, and Vibrio parahaemolyticus incorporated by oysters (Crassostrea brasiliana), as well as the effects of the process on the survival of the oysters and on their sensory attributes. The oysters were exposed to gamma radiation (60Co) in doses ranging from 0.5 to 3.0 kGy. A dose of 3.0 kGy was generally sufficient to reduce the level of Salmonella serotypes by 5 to 6 log10 units. A dose of 1.0 kGy was sufficient to produce a 6-log10 reduction in the level of V. parahaemolyticus. The highest irradiation dose did not kill the oysters or affect their sensory attributes. Hence, a dose of 3.0 kGy can be considered effective in inactivating Salmonella and V. parahaemolyticus in oysters without changing their odor, flavor, or appearance.
Jakabi
Miyoko
M
Departamento de Alimentos e Nutrição Experimental, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Avenida Prof. Lineu Prestes, 580, Bloco 14, 05508-900 São Paulo, Brazil.
Gelli
Dilma S
DS
Torre
Jussara C M D
JC
Rodas
Maria A B
MA
Franco
Bernadette D G M
BD
Destro
Maria T
MT
Landgrafi
Mariza
M
D000818:Animals; D003257:Consumer Product Safety; D004307:Dose-Response Relationship, Radiation; D005514:Food Irradiation; D005519:Food Preservation; D005720:Gamma Rays; D010125:Ostreidae / Q000382:microbiology* / Q000528:radiation effects; D012475:Salmonella / Q000528:radiation effects*; D012477:Salmonella enteritidis / Q000528:radiation effects; D012758:Shellfish / Q000382:microbiology* / Q000528:radiation effects / Q000592:standards; D014736:Vibrio parahaemolyticus / Q000528:radiation effects*