Iranian Journal of Pathology

Reduction of Listeria monocytogenes and Bacillus cereus in Milk by Zinc Oxide Nanoparticles

Document Type : Original Research

Authors

Mahboubeh Mirhosseini 1, 2
Fatemeh Barzegari Firouzabadi 1, 2

1 Dept. of Biology, Payame Noor University, Iran

2 Nano Structured Coatings Institute, Yazd Payame Noor University, Yazd, Iran

10.7508/ijp.2015.02.003
Abstract
Background & Objectives: Direct addition of antimicrobial materials to food during food processing is an effective method for controlling microbial contaminants of food and extending the shelf-life of food products. Objective of this research was to study the antimicrobial effect of zinc oxide (ZnO) nanoparticle and potential applications of ZnO nanoparticles in terms of controling two food-borne pathogens in milk. Methods: Toxicity of different concentration (0, 0.5, 2, 5, and 10 mM) of ZnO nanoparticles on Listeria monocytogenesand Bacillus cereuswas studied in culture media and milk. Results: Among the mentiond concentrations, treatment of 10 mM of ZnO nanoparticle was the most effective one for L. monocytogenesand B. cereus inhibition, which completely inhibited the  growth ofL. monocytogenesand B. cereusin 24h. These data revealed concentration-dependency of the antibacterial activity of ZnO. Therefore, 5 mM and 10 mM ZnO were selected for further studies,  which  were  performed  in  milk,  since  they  demonstrated  significant  growth  inhibition. ZnO NPs were more capable in terms of reducing the initial growth counts of all the above-stated strains in milk. Conclusion: ZnO nanoparticles had an antimicrobial activity against L. monocytogenes and B. cereusin milk and the media. This work was a preliminary study that provided a starting point for determining whether the use of ZnO nanoparticles had the potential for being applied in food preservation or not.

Keywords

Listeria monocytogenes
Bacillus
Zinc oxide
nanoparticles
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  • Receive Date 17 February 2014
  • Revise Date 15 April 2014
  • Accept Date 21 October 2014

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