An Evaluation of the Antibacterial Activity of Pterocarpus tinctorius Bark Extract against Enteric Bacteria That Cause Gastroenteritis

Table 3

Antibacterial activity of subfractions against three bacterial strains at 10 mg/mL.

Fraction	Zone of inhibition
	Shigella dysenteriae	Salmonella typhi	Escherichia coli (ATCC 25923)
FM1	NZ	NZ	NZ
FM2	20 ± 0.1	18.0 ± 0.1	17.2 ± 0.3
FM3	NZ	NZ	NZ
Ciprofloxacin	21 ± 0.1	20 ± 0.0	20 ± 0.2

Zones of inhibition in millimetres after excluding 6 mm of well diameter for 10 mg/mL of the subfractions and 0.01 mg/mL for ciprofloxacin. NZ, no zone of inhibition was observed. All values are expressed as the mean (n = 3). Values with superscript ∗ differ significantly from Shigella dysenteriae values at . .