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The plant extracts are potential sources of modern antimicrobial compounds, especially against bacterial pathogens. In the current research, the whole plant of Allium neapolitanun was screened out to determine their antibacterial potential. The antibactrial activities were observed in different extracts of leaves, flowers and bulbs with different concentrations against four bacterial strains. For Bacillus subtillis, the ethanolic extracts of bulbs showed highest 31.5% inhibition followed by flowers and leaves at 6 μl/ml concentrations. The flowers showed highest inhibition 34.74% and 46.9% followed by leaves and bulbs at the 12 μl/ml and 18 μl/ml concentrations respectively. For Escherichia coli, among the ethanolic extracts, only bulbs showed highest 44.3% inhibition at 6 μl/ml. Bulb also showed highest inhibition at 12 μl/ml concentration followed by leaves and flowers. However, highest 60% inhibition was shown by flowers followed by bulbs and leaves at 18 μl/ml concentrations while at 12 μl/ml concentration the highest 41.9% inhibition was shown by leaves followed by flower. For Klebsiella pneumonia and Xanthomonas species, among the ethanolic extracts, the highest inhibition was shown by bulbs 38.13%, 38.9% followed by flowers at 6 μl/ml concentrations. Similarly, the highest inhibition was also shown by bulbs 40.5% and 37.03%, followed by flowers and leaves at 12 μl/ml concentrations while the highest 56.09% inhibition was shown by flowers followed by leaves and bulbs at 18 μl/ml concentrations. The highest 43.03% and 45.7% inhibition was shown by flowers followed by leaves and bulbs at 12 μl/ml concentrations while at 18 μl/ml concentration the highest but same inhibition (46.32%) was shown by leaves and flowers, followed by bulbs. Among the methanolic extracts, no activity was observed at 6 μl/ml concentrations for all bacterial strains.
Keywords: Antibacterial activities; Bacterial strains; Ethanolic and methanolic extracts