Table 1. Antibacterial efficacy of the extracts from selected medicinal plants.
Mean diameter of zone of inhibition (mm)
Aqueous extract
Ethanolic extract
Plant
Plant
Part
Staphylococcus
Pseudomonas
Staphylococcus
Pseudomonas
species
family
used
aureus
aeruginosa
aureus
aeruginosa
Galinsoga
Asteraceae
Leaves
14
10
11
7
parviflora
(GP)
Racinus
Spurge
Leaves
18
14
13
8
communis
(RC)
Datura
Solanaceae
Leaves
12
8
10
6
stramonium
(DS)
Antibacterial activity: <6 mm: Weak; 7–12 mm: Moderate; >12 mm: Strong
Figure 1. Shows the antibacterial activity of Aqueous and
Ethanolic extracts from selected plants against Staphylococcus aureus bacterial strain.
Figure 2. Shows the antibacterial activity of Aqueous and
Ethanolic extracts from selected plants against Pseudomonas
Aeruginosa bacterial strain.
4.2 Minimum Inhibition Concentration (MIC) of
the aqueous and ethanolic herbal extracts from
selected plants against both Staphylococcus
aureus and Pseudomonas aeruginosa bacterial
strains
The MIC values obtained from plant extracts demonstrated antibacterial activity which ranged from 3 to
Figure 3. Antibacterial Activity of pure solvents and
selected standard antibiotics.
Table 2. Antibacterial activity of controls.
Zone of inhibition (mm)
Staphylococcus Pseudomonas
Controls
aureus
aeruginosa
Ciproflaxin (30 µg)
22
20
Distilled water (100 µL) –
–
Ethanol (100 µL)
–
–
Antibacterial activity: Staphylococcus aureus; ≥22 mm,
Pseudomonas Aeruginosa; ≥15 mm.
30 mg/mL (Table 3). Aqueous and ethanolic extracts of
Datura stramonium gave MIC values of 30 mg/mL and
30 mg/mL, respectively, against both Staphylococcus
and Pseudomonas bacterial strains. Ethanolic extracts
of Galinsoga parviflora gave MIC values of 30 mg/mL
against both Staphylococcus and Pseudomonas bacterial strains and none was observed for aqueous
extracts. Then, aqueous and ethanolic extracts of Racinus communis gave MIC values of 3 mg/mL and
30 mg/mL, respectively, against both bacterial strains.
Generally, aqueous extracts were observed to have
the most effective antimicrobial activity compared to
ethanolic extracts.
98
Mean diameter of zone of inhibition (mm)
Aqueous extract
Ethanolic extract
Plant
Plant
Part
Staphylococcus
Pseudomonas
Staphylococcus
Pseudomonas
species
family
used
aureus
aeruginosa
aureus
aeruginosa
Galinsoga
Asteraceae
Leaves
14
10
11
7
parviflora
(GP)
Racinus
Spurge
Leaves
18
14
13
8
communis
(RC)
Datura
Solanaceae
Leaves
12
8
10
6
stramonium
(DS)
Antibacterial activity: <6 mm: Weak; 7–12 mm: Moderate; >12 mm: Strong
Figure 1. Shows the antibacterial activity of Aqueous and
Ethanolic extracts from selected plants against Staphylococcus aureus bacterial strain.
Figure 2. Shows the antibacterial activity of Aqueous and
Ethanolic extracts from selected plants against Pseudomonas
Aeruginosa bacterial strain.
4.2 Minimum Inhibition Concentration (MIC) of
the aqueous and ethanolic herbal extracts from
selected plants against both Staphylococcus
aureus and Pseudomonas aeruginosa bacterial
strains
The MIC values obtained from plant extracts demonstrated antibacterial activity which ranged from 3 to
Figure 3. Antibacterial Activity of pure solvents and
selected standard antibiotics.
Table 2. Antibacterial activity of controls.
Zone of inhibition (mm)
Staphylococcus Pseudomonas
Controls
aureus
aeruginosa
Ciproflaxin (30 µg)
22
20
Distilled water (100 µL) –
–
Ethanol (100 µL)
–
–
Antibacterial activity: Staphylococcus aureus; ≥22 mm,
Pseudomonas Aeruginosa; ≥15 mm.
30 mg/mL (Table 3). Aqueous and ethanolic extracts of
Datura stramonium gave MIC values of 30 mg/mL and
30 mg/mL, respectively, against both Staphylococcus
and Pseudomonas bacterial strains. Ethanolic extracts
of Galinsoga parviflora gave MIC values of 30 mg/mL
against both Staphylococcus and Pseudomonas bacterial strains and none was observed for aqueous
extracts. Then, aqueous and ethanolic extracts of Racinus communis gave MIC values of 3 mg/mL and
30 mg/mL, respectively, against both bacterial strains.
Generally, aqueous extracts were observed to have
the most effective antimicrobial activity compared to
ethanolic extracts.
98