Tahini was mixed well with a sterile spatula and samples of 50 g
of tahini or hydrated tahini were placed or poured into sterile
100 ml plastic cups. Acetic and citric acids (SigmaeAldrich, St.
Louis, MO, US) were added to the tahini at 0.0, 0.1, 0.3 and 0.5% (v/
w) and gently mixed using a sterile spatula. Tahini and hydrated
tahini samples were inoculated with one ml of 8.0 or 5.0 log10 CFU/
ml S. Typhimurium, respectively, and stored at 10, 21 and 37 C for
28 d.