title: The effect of electron beam irradiation on the survival of Salmonella enterica serovar typhimurium and psychrotrophic bacteria on raw chicken breasts stored at four degrees celsius for fourteen days.
abstract: The effect of high-energy electron beam irradiation on the survival of Salmonella enterica serovar Typhimurium and psychrotrophic bacteria on commercial chicken breast meat was evaluated. Fresh chicken breast meat was purchased from a local poultry processor, inoculated with 8 log10 cfu/mL Salmonella, packaged in Styrofoam trays and over wrapped with a polyvinyl chloride film, and subjected to 0, 1, 2, or 3 kGy of irradiation. The packaged samples were stored at 4 degrees C and analyzed for Salmonella Typhimurium and psychrotrophic organisms at 0, 2, 4, 6, 8, 10, 12, and 14 d of storage. Direct plating and enrichment methods were used for S. Typhimurium analyses. The direct plating method revealed a 4 log reduction in Salmonella for chicken breasts inoculated and treated with 1, 2, or 3 kGy of irradiation. Psychrotrophic counts were conducted at 7 degrees C for 10 d and 25 degrees C for 5 d to determine the effect of incubation methods on the recovery of psychrotrophic organisms. The enrichment method resulted in the repair of injured Salmonella cells and an elevated Salmonella Typhimurium count for all irradiation dosages when compared with data reported for the direct plating method. In general, psychrotrophic counts increased as storage time increased. However, psychrotrophic counts decreased (P < 0.05) as the irradiation dosage increased.
authors.affiliation: Department of Animal Sciences, University of Florida, Gainesville, Florida 32611-0910, USA.
authors.forename: K C
authors.initials: KC
authors.lastname: Sarjeant
authors.forename: S K
authors.initials: SK
authors.lastname: Williams
authors.forename: A
authors.initials: A
authors.lastname: Hinton
mesh_terms: D000818:Animals; D001419:Bacteria / Q000528:radiation effects*; D002645:Chickens; D003080:Cold Temperature; D015169:Colony Count, Microbial; D004307:Dose-Response Relationship, Radiation; D016972:Enterobacter cloacae / Q000528:radiation effects; D005514:Food Irradiation / Q000379:methods*; D005516:Food Microbiology; D018857:Food Packaging; D005519:Food Preservation; D005615:Freezing; D020611:Hafnia alvei / Q000528:radiation effects; D007711:Klebsiella pneumoniae / Q000528:radiation effects; D008460:Meat / Q000382:microbiology*; D008837:Micrococcus / Q000528:radiation effects; D011551:Pseudomonas fluorescens / Q000528:radiation effects; D012486:Salmonella typhimurium / Q000528:radiation effects*; D012705:Serratia / Q000528:radiation effects; D013997:Time Factors