2. Materials and methods
2.1. Preparation of bacterial culture
S. Typhimurium ATTC 14028 was used and kept at 40 C in
Brain Heart Infusion (BHI, Oxoid Ltd, Basingstoke, UK) broth containing
20% glycerol. One loopful of frozen culture was streaked on
xylose lysine deoxycholate agar (XLD agar, Oxoid) plates which
were incubated at 37 C for 24 h. A single colony was transferred to
BHI broth and incubated 37 C for 24 h. Three transfers were performed
to resuscitate the culture and the final transfer in BHI broth
prior to the experiment was grown for 24 h at 37 C to reach the
stationary phase. The S. Typhimurium culture was diluted using
peptone water (0.1%) to give a final concentration of about
6 log10 CFU/ml or 4 log10 CFU/ml in tahini or hydrated tahini