Fate of Salmonella during sesame seeds roasting and storage of tahini

Tahini is usually consumed without further heat treatment, and roasting of sesame seeds is the only Salmonella inactivation step in its traditional production process. This study examined the efficiency of the roasting process in the elimination of Salmonella from sesame seeds and the survival of Salmonella in tahini during storage. Sesame seed and tahini samples were inoculated with a cocktail of three serotypes of Salmonella (S. Typhimurium, S. Newport and S. Montevideo). Complete inactivation of Salmonella in sesame seeds, inoculated with 5.9 log cfu/g, was achieved by roasting at 110 degrees C for 60 mm, 130 degrees C for 50 mm, or 150 degrees C for 30 min. Salmonella levels in tahini (a(w) = 0.17) inoculated with 5.6 log cfu/g and stored for 16 weeks at 22 or 4 degrees C decreased by 4.5 and 3.3 log, respectively. Results of this study demonstrated that the standard roasting process is sufficient to inactivate Salmonella in sesame seeds and low water activity of tahini prevents microbial growth, but its composition allows Salmonella to survive for at least 16 weeks. Therefore, prevention of cross-contamination after roasting is crucial for food safety. (C) 2013 Elsevier B.V. All rights reserved.