Fig. 4
The inhibitory activity of quercetin against β-lactamase in hydrolyzing benzylpenicillin. β-lactamase used from E. cloacae; Con = control (no testing agent); Que (50) = Quercetin 50 μg/mL. The graph shows the remaining benzylpenicillin at the same time. Means sharing the same superscript are not significantly different from each other (Scheffe’s test, p < 0.01)