Antibacterial Activity of Magnesium Oxide Nanoparticles against Listeria monocytogenes
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Abstract:
The antibacterial effects of different concentrations of magnesium oxide (MgO) nanoparticles and non-nano MgO particles on Listeria monocytogenes were investigated in this study. as Additionally, the impact of low temperature (4 and -18 ℃) on the antibacterial effect of MgO nanoparticles was studied. Scanning electron microscopy (SEM) was used to characterize the morphological changes of L. monocytogenes before and after MgO nanoparticle treatment at 37 ℃. The results showed that MgO nanoparticles had strong antibacterial activity against L. monocytogenes at 37 ℃, in a concentration dependent manner. In addition, MgO nanoparticles showed antibacterial effect in a neutral buffer solution, whereas non-nano MgO at the same concentration had almost no antibacterial effect, along with the alkaline condition with the same pH that was used for MgO nanoparticles. Thus, it is speculated that the main antibacterial factors are the nanomaterial properties of MgO nanoparticles. At low temperature, the L. monocytogenes in the control group grew slowly at 4 ℃, with growth showed a downward trend at -18 ℃. The growth rate of L. monocytogenes was significantly inhibited by the addition of MgO nanoparticles at low temperatures. SEM analysis at 37 ℃ showed that L. monocytogenes cells were elongated after treatment with MgO nanoparticles.
