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

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