article · PLoS ONE
Traditional healthcare practices in Ethiopia frequently utilise medicinal plants to manage human and livestock illnesses, yet scientific validation remains necessary. This investigation assessed the phytochemical constituents and antibacterial properties of five locally preferred medicinal plants from Habru District: Solanum somalense, Verbascum sinaiticum, Rumex nervosus, Withania somnifera, and Calpurnia aurea. Phytochemical screening revealed secondary metabolites including steroids, alkaloids, flavonoids, saponins, and terpenoids across the plants. In laboratory testing of ethanol and aqueous extracts against standard bacterial strains, ethanol extracts from three species demonstrated measurable antibacterial activity. Solanum somalense inhibited Streptococcus agalactiae, Withania somnifera proved active against Staphylococcus aureus and Escherichia coli, and Calpurnia aurea showed efficacy against Escherichia coli and Klebsiella pneumoniae. These results provide laboratory evidence supporting traditional applications for infectious diseases, while identifying specific botanical sources that require active compound isolation.
Infectious diseases place a heavy burden on human and animal health, particularly in regions reliant on traditional remedies. Scientifically verifying the antimicrobial activity of traditionally used plants helps establish whether customary healthcare treatments possess biological effectiveness. This evidence assists in understanding local remedies and lays groundwork for identifying naturally occurring compounds that could serve as alternative treatments against common bacterial infections.
This work represents very early-stage discovery research that could inform pharmaceutical development and natural antimicrobial formulation. The findings highlight raw plant extracts that inhibit common bacteria, offering candidate botanicals for natural product researchers and drug development teams. However, real-world application remains distant because the specific active compounds must still be isolated, chemically characterised, and assessed for safety and clinical efficacy before any therapeutic product can be manufactured.
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Ethiopia's healthcare system relies on traditional medicinal practices that use medicinal plants to treat human and livestock ailments. However, the lack of empirical validation regarding the efficacy of these treatments against specific infectious diseases necessitates rigorous scientific investigations. The objective of this study was to investigate the antibacterial activity and phytochemical screening on five selected medicinal plant species, namely Solanum somalense Franchet., Verbascum sinaiticum Benth., Rumex nervosus Vahl, Withania somnifera (L.) Dunal and Calpurnia aurea (Ait.) Benth. The plants were first identified jointly with local informants and later considering mainly their high informant consensus and fidelity level values for their efficacy in treating infectious diseases in the area. Ethanol and aqueous extracts were prepared from the plant materials, and their antibacterial activities were evaluated against standard bacterial strains, representing both gram-positive and gram-negative types. To assess the antibacterial activity of the extracts, the minimum inhibitory concentration (MIC) was determined using the broth dilution method. Additionally, phytochemical screening was performed using standard qualitative tests to identify various secondary metabolites. The results indicated antibacterial efficacy in the ethanol extracts of S. somalense, W. somnifera, and C. aurea against particular bacterial strains (S. somalense against S. agalactiae with MIC of 1.5 mg/mL; W. somnifera against S. aureus and E. coli, with MIC of 2 mg/mL; C. aurea against E. coli and K. pneumoniae, with MICs of 3 mg/mL and 3.5 mg/mL, respectively). The results of the phytochemical screening indicated the presence of steroids, alkaloids, flavonoids, saponins, and terpenoids. The selected medicinal plants demonstrated promising antibacterial activity against certain bacterial strains. The current findings support the long-standing claim of the traditional medical system of the study area for their continued use of these plants in their treatment of infectious diseases. Further investigation is required to isolate the responsible active compounds and characterize the constituents and description of their antibacterial effect for possible use in areas where these infectious diseases are major health problems.
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DOI: 10.1371/journal.pone.0300060
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