This study was designed to screen and characterize antibiotic producing bacteria and fungi from soil samples from a waste dump site in Enugu. The molecular characterization of the isolates was performed by using Zymo ...This study was designed to screen and characterize antibiotic producing bacteria and fungi from soil samples from a waste dump site in Enugu. The molecular characterization of the isolates was performed by using Zymo Research Quick-DNA fungi/bacteria miniprep kit. The bacteria isolates were <i>Providencia stuartii</i>, <i>Providencia alcalifaciens.</i> <i>Bacillus sp.</i>, <i>Streptococcus sp.</i>, <i>Micrococcus sp.</i>, and <i>Staphylococcus sp</i> while <i>Aspergillus fumigatus</i> and <i>Aspergillus niger</i> were fungal isolates. The efficacy of the Crude Extract (CE) of the antibiotics produced was tested against species of <i>Staphylococcus aureus</i> and <i>Escherichia coli</i>. The CE of antibiotics when compared with a conventional antibiotic (Ciprofloxacin) showed lower antimicrobial activity. The minimum inhibitory concentration of the crude extracts ranged between 12.5% and 25% concentrations while the minimum bactericidal concentration ranged from 25% and 50% concentrations. The findings suggest that these organisms have the potential to produce antibiotics and could be harnessed by pharmaceutical industries for the production of newer antibiotics.展开更多
文摘This study was designed to screen and characterize antibiotic producing bacteria and fungi from soil samples from a waste dump site in Enugu. The molecular characterization of the isolates was performed by using Zymo Research Quick-DNA fungi/bacteria miniprep kit. The bacteria isolates were <i>Providencia stuartii</i>, <i>Providencia alcalifaciens.</i> <i>Bacillus sp.</i>, <i>Streptococcus sp.</i>, <i>Micrococcus sp.</i>, and <i>Staphylococcus sp</i> while <i>Aspergillus fumigatus</i> and <i>Aspergillus niger</i> were fungal isolates. The efficacy of the Crude Extract (CE) of the antibiotics produced was tested against species of <i>Staphylococcus aureus</i> and <i>Escherichia coli</i>. The CE of antibiotics when compared with a conventional antibiotic (Ciprofloxacin) showed lower antimicrobial activity. The minimum inhibitory concentration of the crude extracts ranged between 12.5% and 25% concentrations while the minimum bactericidal concentration ranged from 25% and 50% concentrations. The findings suggest that these organisms have the potential to produce antibiotics and could be harnessed by pharmaceutical industries for the production of newer antibiotics.
