Abstract
Background: Escherichia coli O157:H7 is one of the most common causes of contamination
in Lighvan cheese processing. Using from natural antimicrobial essential oils is applied method
to decrease the rate of microbial contamination of dairy products. The present investigation was done
to study the antimicrobial effects of Z. multiflora and O. basilicum essential oils on survival of E. coli
O157:H7 during ripening of traditional Lighvan cheese.
Methods: Leaves of the Z. multiflora and O. basilicum plants were subjected to the Clevenger
apparatus. Concentrations of 0, 100 and 200 ppm of the Z. multiflora and 0, 50 and 100 ppm of
O. basilicum essential oils and also 103 and 105 cfu/ml numbers of E. coli O157:H7 were used. The
numbers of the E. coli O157:H7 bacteria were analyzed during the days 0, 30, 60 and 90 of the
ripening period.
Results: Z. multiflora and O. basilicum essential oils had considerable antimicrobial effects against
E. coli O157:H7. Using the essential oils caused decrease in the numbers of E. coli O157:H7 bacteria
in 90th days of ripening (P <0.05). Using from Z. multiflora at concentration of 200 ppm can reduce
the survival of E. coli O157:H7 in Lighvan cheese.
Conclusion: Using Z. multiflora and O. basilicum essential oils as good antimicrobial agents can reduce
the risk of foodborne bacteria and especially E. coli O157:H7 in food products.
Keywords:
Antimicrobial effects, Escherichia coli O157:H7, lighvan cheese, microbial contamination, Ocimum basilicum,
Zataria multiflora.
Graphical Abstract
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