2.2.1. Microorganisms and Culture Conditions

Five Gram-positive (*Bacillus cereus* DSM 4313, *Bacillus cereus* DSM 4384, *Staphylococcus aureus* DMS 25923, *Enterococcus faecalis* DSM 2352 and *Listeria innocua* DSM 20649) and two Gram-negative (*Escherichia coli* DSM 8579, and *Pseudomonas aeruginosa* ATCC 50071) bacterial strains were cultured for 18 h in Luria Bertani (LB) broth (Sigma, Milano, Italy) at 37 ◦C and 80 rpm (Corning LSE, Pisa, Italy).
