Cup plate diffusion technique was used to assess the antimicrobial actions of anise oil -based nanoemulsion by means of using the tested microbes; Gram-positive bacterium: Staphylococcus aureus (S. aureus, ATCC 6538), Gram-negative bacterium: Escherichia coli (E. coli, ATCC 25922), yeast: Candida albicans (C. albicans, ATCC 10231) and the fungus: Aspergillus niger (A. niger, NRRL A-326). Both bacteria and yeast were grown on nutrient agar medium, whereas the fungus was grown on Czapek–Dox medium [21,22]. Neomycin and cycloheximide were used as antibacterial and antifungal references, respectively.
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