title: Inactivation of Listeria innocua on frankfurters by ultraviolet light and flash pasteurization.
abstract: Listeria monocytogenes, a psychrotrophic foodborne pathogen, is a recurring postprocess contaminant on ready-to-eat meat (RTE) products including frankfurters. Flash (Steam) Pasteurization (FP) and ultraviolet light (254 nm-UVC) has been shown to reduce levels of L. monocytogenes and L. innocua on frankfurters. In this study, the use of UVC light followed by FP to inactivate L. innocua, a nonpathogenic surrogate for L.monocytogenes, on frankfurters that contained sodium diacetate and potassium lactate (SDA/PL) in a pilot-plant setting was investigated. Application of UVC (1.0 J/cm2), followed by FP (0.75 s steam/121 degrees C) resulted in inactivation of 3.19 log L. innocua, while application of UVC (4.0 J/cm2), followed by FP (3 s steam/121 degrees C) resulted in inactivation of 3.89 log of L. innocua. A refrigerated storage study (8 degrees C) of frankfurters that contained SDA/PL that were treated with UVC followed by FP revealed the growth of L. innocua was inhibited for approximately 8 wk following application of the interventions. The use of UVC in combination with FP had little effect on frankfurter color and texture. The combination of UVC, FP, and SDA/PL was found to be an effective hurdle process for decontamination of frankfurter surfaces.
authors.affiliation: Eastern Regional Research Center, Agricultural Research Service, U.S. Dept. of Agriculture, 600 East Mermaid Lane, Wyndmoor, PA 19038, USA. christopher.sommers@ars.usda.gov
authors.forename: C H
authors.initials: CH
authors.lastname: Sommers
authors.forename: D J
authors.initials: DJ
authors.lastname: Geveke
authors.forename: S
authors.initials: S
authors.lastname: Pulsfus
authors.forename: B
authors.initials: B
authors.lastname: Lemmenes
mesh_terms: D000818:Animals; D003080:Cold Temperature; D005516:Food Microbiology; D005519:Food Preservation / Q000379:methods*; D007773:Lactates / Q000032:analysis; D008087:Listeria / Q000187:drug effects / Q000254:growth & development* / Q000528:radiation effects; D008461:Meat Products / Q000032:analysis / Q000382:microbiology*; D019346:Sodium Acetate / Q000032:analysis; D013227:Steam; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D007773:Lactates; D013227:Steam; D019346:Sodium Acetate