The strains of Salmonella enterica subsp. enterica serovar Senftenberg 775 W (CECT 4565) and L. monocytogenes (CECT 5672) used in this investigation were supplied by Colección Española de Cultivos Tipo (CECT). Broth subcultures of each serotype were prepared in flasks containing 50 mL of tryptic soy broth (Biolife, Milan, Italy) plus 0.6%(w/v) of yeast extract (Biolife) (TSBYE) inoculated to an initial concentration of approximately 106 CFU/mL. The cultures were incubated under agitation (135 rpm) (mod. Rotabit, Selecta, Spain) at 37 °C until the stationary growth phase was reached. Before treatment, bacterial suspensions were centrifuged at 6000×g for 5 min at 4 °C and re-suspended in 1 mL of LWE with the corresponding additive at a concentration of approximately 109 CFU/mL. LWE with additives, inoculated with the corresponding microbial population, was immediately
subjected to PEF and/or thermal treatments. The additives in the
concentrations did not affect the number of survivors during the storage
time at 4 °C before the treatments (data not shown).