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Table 3 The minimum inhibitory/bactericidal/fungicidal concentrations of crude root, root bark, and root tubr extracts of Acanthus polystachyus, Keetia gueinzii, and Rychnosia elegans respectively

From: Qualitative and quantitative phytochemical composition, antimicrobial activity, and brine shrimp cytotoxicity of different solvent extracts of Acanthus polystachyus, Keetia gueinzii, and Rhynchosia elegans

Type of pathogen Plant extract MIC (mg/mL) MBC (mg/mL) MFC (mg/mL) MBC/MIC MFC/MIC
Bacillus cereus (Gram + ve) Acanthus polystachyus      
  Aqueous 25 50 2
  Acetone 12.5 12.5 1
  Methanol 100 200 2
  Keetia gueinzii      
  Aqueous 50 100 2
  Acetone 12.5 12.5 1
  Methanol 25 50 2
  Rychnosia elegans      
  Aqueous ND ND ND
  Acetone * * *
  Methanol ND ND ND
Staphylococcus aureus (Gram + ve) Acanthus polystachyus      
  Aqueous ND ND ND
  Acetone ND ND ND
  Methanol 200 400 2
  Keetia gueinzii      
  Aqueous 12.5 12.5 1
  Acetone 12.5 12.5 1
  Methanol 25 50 2
  Rychnosia elegans     
  Aqueous ND ND ND
  Acetone * * *  
  Methanol 200 400 2  
  Amoxicillin 0.00156 0.00156 1
Escherichia coli (Gram –ve) Acanthus polystachyus      
  Aqueous ND ND ND
  Acetone ND ND ND
  Methanol 200 400 2
  Keetia gueinzii      
  Aqueous 200 400 2
  Acetone 200 400 2
  Methanol 200 400 2
  Rychnosia elegans      
  Aqueous ND ND ND
  Acetone * * *
  Methanol ND ND ND
  Gentamycin 0.0156 0.0156 1
Candida albicans Acanthus polystachyus      
  Aqueous ND ND ND
  Acetone 400 400 1
  Methanol 200 400 2
  Keetia gueinzii      
  Aqueous ND ND ND
  Acetone 200 400 2
  Methanol 100 200 2
  Rychnosia elegans      
  Aqueous ND ND ND
  Acetone * * *
  Methanol ND ND ND
  Nystatin 0.00156 0.00156 1
  1. MIC minimum inhibitory concentration, MBC minimum bactericidal concentration, MFC minimum fungicidal concentration, ND not determined (did not display activity at the tested concentrations)
  2. *Extract not subjected to antimicrobial screening