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Antibacterial efficacy of ethanolic extract of and leaves on methicillin-resistant and shiga-toxigenic . | LitMetric

AI Article Synopsis

Article Abstract

Objective: This study aims at investigating the antibacterial potential of ethanolic extract of (common name: Green tea) and (common name: Neem) leaves on methicillin-resistant (MRSA) and shiga-toxigenic (STEC).

Materials And Methods: Fresh leaves were processed and extracted by 99% ethanol and reconstituted with 50% ethanol before testing. Disk diffusion and broth microdilution methods were used to determine zone diameter of inhibition (ZDI) and minimum inhibitory concentration (MIC), respectively. Nutrient agar plate was used to estimate the minimum bactericidal concentration (MBC).

Results: Maximum ZDI value was observed for green tea against MRSA (7.5 mm) and minimum for neem (4.9 mm). Moreover, the highest ZDI against STEC was also for green tea and the combination of green tea and neem (4.5 mm). The MIC values of green tea extract were 15.625 and 31.25 mg/ml against MRSA and STEC, respectively, whereas the MIC of neem was 31.25 and 125 mg/ml, respectively. The combination had similar MIC (46.87 mg/ml) against both organisms. Green tea showed the lowest MBC values, 31.25 and 62.5 mg/ml, against MRSA and STEC, respectively. However, MBC of neem and the combination against MRSA and STEC were found >250 mg/ml, >500 mg/ml and 93.75 mg/ml, >375 mg/ml, respectively.

Conclusion: Green tea and neem leaves showed good antimicrobial effects and can be used to explore novel antimicrobial compounds against MRSA and STEC.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6702883PMC
http://dx.doi.org/10.5455/javar.2019.f340DOI Listing

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