Research Article

Synergy and Mode of Action of Ceftazidime plus Quercetin or Luteolin on Streptococcus pyogenes

Figure 4

The inhibitory activity of luteolin, quercetin, and ceftazidime against β-lactamase in hydrolyzing benzylpenicillin. β-lactamase used from E. cloacae; Con = control (no testing agent), Cef (0.25) = 0.25 μg mL−1, Que (64) = quercetin 64 μg mL−1, and Lut (64) = luteolin 64 μg mL−1. The graph shows the remaining benzylpenicillin at the same time. The research was executed in three studies, and all graphs are displayed as mean ± SEM. Means sharing the same superscript are not significantly different from each other (Scheffe’s, ).