Author(s): Yadullah Edalatpanah, Freshteh Rahedan, Manejeh Rostami, Hadi Rezaei, Khadeigeh Sanaeiyan, Parisa HosseiniAlvand
"Nanoparticles (NPs) are widely recognized because of their usage in biological applications including nano-medicine and food safety. The objective of this experiment was to determine the effect of ZnO NPs and citric acid on the survival of Salmonella typhimurium inoculated on to mango juice and carrot juice. Antibacterial activities of different concentrations (0, 1, 2, 4, 6, 8, 10 mM) of zinc oxide (ZnO) suspension containing 1% citric acid were tested against the Salmonella typhimurium inoculated on to culture media by spot on the lawn method and culture turbidity as a qualitative measure of the cell growth. Results manifested more inhibitory effect of ZnO in liquid medium than the solid culture against Salmonella typhimurium. These data suggested that the antibacterial activity of ZnO was concentration dependent which was previously confirmed by the agar diffusion test. ZnO NPs were more effective in initial reduction of Salmonella typhimurium. Results demonstrated that ZnO NPs suspensions containing citric acid had synergic effect against studied bacteria in media. Citric acid 1% dilution in concentrations of and in mango and carrot juice, which 102,104,106 108 show the highest antimicrobial effect in concenteration 6 mM and 8 mM dilution of the 106and 108 . The effect of zinc nano oxide synergic and citric acid 1% has stronger antimicrobial effect in the face with net citric acid 1%."
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