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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