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Showing 2 results for Afshari

Mojtaba Raeisi , Mohammad Hashemi , Ali Reza Sadeghi , Majid Aminzare , Mahdi Khodadadi, Amir Mahmoud Ahmadzadeh , Asma Afshari,
Volume 2, Issue 4 (9-2017)

Background: Zataria multiflora boiss is a member of Lamiaceae family with antibacterial, antifungal, and antioxidant activity. The aim of this study was to evaluate chemical composition and antibacterial effect of Zataria multiflora essential oil against two foodborne pathogens in meat.
Methods: The inhibitory effect of Zataria multiflora essential oil (Minimum inhibitory concentration and Minimum bactericidal concentration) was evaluated against Salmonella  typhimurium and Listeria monocytogenes, inoculated in ground beef meat after 3, 5, 7 and 9 days of storage.
Results: Result revealed 26 various compounds, representing 96.27% of total oil. Thymol was the most abundant compound among all constituents (29.2%). A significant reduction was observed in Salmonella typhimurium when adding 1 and 2% Zataria multiflora (p<0.05) compared with 0.5% and 1% concentrations during 9 days of storage. Listeria monocytogenes significantly decreased in treatments with 0.5%, 1 and 2% of Zataria multiflora essential oil.
Conclusion: Zataria multiflora has an inhibitory effect on the growth of L. monocytogenes and in higher concentrations on the growth of S. typhimurium and can be used as a natural preservative in order to retard the growth of food-borne pathogens.

Milad Tavassoli, Abdollah Jamshidi, Fahimeh Movafagh, Asma Afshari,
Volume 5, Issue 2 (6-2019)

Background: Yersinia enterocolitica (Y. enterocolitica) has a wide range of clinical, animal, food, and water sources. Most studies have indicated that food is the most common source of this organism. The present study aimed to evaluate the virulent genes of Y. enterocolitica isolated from dairy products in Iran.
Methods: The virulence of Y. enterocolitica biotypes was investigated, which was isolated from 38 cheese and 33 raw milk samples in the northeast of Iran. In total, six virulence-related genes were evaluated, including ail, inv, yadA, myfA, ystA, and ystB in 1A, 1B, and 5 Y. enterocolitica biotypes.
Results: In the isolates of the 1A biotype, ystB was the most frequent gene (86.95% and 38.46% in cheese and raw milk, respectively). In the 1B biotype, the most frequently isolated gene was yadA (92.30% and 66.66% in cheese and raw milk, respectively). In all the isolates, the least frequently isolated gene was ail, followed by myfA.
Conclusion: According to the results, the presence of virulence genes in the Y. enterocolitica strains isolated from dairy products suggested that these strains could pose significant risk to public health if dispersed in susceptible human population.

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