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.