Effect of Radiant Catalytic Ionization and Ozonation on spp. on Eggshells.

Three strains were used in the study (serovars: , and ). This study evaluated the efficacy of radiant catalytic ionization (RCI) and ozonation against spp. on eggshell (expressed as log CFU/egg). The egg surface was contaminated three different bacterial suspension (10 CFU/mL, 10 CFU/mL and 10 CFU/mL) with or without poultry manure. Experiments were conducted at 4 °C and 20 °C in three different time period: 30 min, 60 min and 120 min. Treatment with RCI reduced numbers from 0.26 log CFU/egg in bacterial suspension 10 CFU/mL, 4 °C and 20 °C, with manure for 30 min to level decrease in bacteria number below the detection limit (BDL) in bacterial suspension 10 CFU/mL, 20 °C, with or without manure for 120 min. The populations of spp. on eggs treated by ozonizer ranged from 0.20 log CFU/egg in bacteria suspension 10 CFU/mL, 20 °C, with manure for 30 min to 2.73 log CFU/egg in bacterial suspension 10 CFU/mL, 20 °C, with manure for 120 min. In all treatment conditions contamination with poultry manure decrease effectiveness the RCI and ozonation. In summary, RCI technology shows similar effectiveness to the ozonation, but it is safer for poultry plant workers and consumers.