Antimicrobial Activity of Xoconostle Pears (Opuntia matudae) against Escherichia coli O157:H7 in Laboratory Medium

Table 2

Inhibitory zones in BHI agar inoculated with mixture of E. coli O157:H7 strains that formed around the wells due to the present of xoconostle extract at different concentrations (v/v) after 12 h of incubation at 37^°C. Concentrations are in μL adjusted to 1 mL by distilled water and inhibitory zone = diameter of the zone −8 mm (diameter of the well). Data represent the average of three replicates with standard error.

Concentration (μL/mL)	Inhibitory zone (mm)
200	0
300	1.4±0.3
400	2.9±0.2
500	4.3±0.45
600	5.7±0.3
700	6.6±0.36
800	7.7±0.35
900	9.0±0.45
1000	9.8±1.01