Antibacterial Effects of Cissus welwitschii and Triumfetta welwitschii Extracts against Escherichia coli and Bacillus cereus
Table 2
MICs and MBCs of plant extracts and antibiotics against B. cereus and E. coli. The assay was conducted twice.
Bacterium
Extract/antibiotic
MIC (mg/mL)
MBC (mg/mL)
B. cereus
C. welwitschii leaf methanol
2
>4
C. welwitschii root methanol
2
>4
T. welwitschii leaf methanol
0.125
>0.5
T. welwitschii root methanol
0.25
>1
T. welwitschii root water
0.5
>2
Ampicillin
0.004
0.008
Kanamycin
0.0005
0.004
Norfloxacin
0.00025
0.002
E. coli
C. welwitschii leaf methanol
0.5
2
C. welwitschii root methanol
1
a
T. welwitschii leaf methanol
0.125
>0.5
T. welwitschii root methanol
0.5
2
T. welwitschii root water
>4
>4
Ampicillin
0.008
0.016
Kanamycin
0.001
0.008
Norfloxacin
0.00025
0.004
The > indicates that the MIC and MBC were higher than the tested concentrations. At 4 mg/mL of the C. welwitschii root methanol extract, E. coli cells were able to grow, but they were unable to grow at 2 mg/mL.