Fig 4. Efflux pump inhibitory activity of apigenin, piperine, and quercetin as indicated by LC-MS measurement of residual ethidium bromide in spent broth after a 30 min incubation.

Relative peak area (expressed as a percentage) for ethidium is plotted as a function of concentration of the putative inhibitor. Data points represent the mean of 3 measurements (biological replicates), with error bars representing standard deviation.