Fig. 8. Comparison of competitive calibration curves in 50 : 50 (v/v) MeCN : HEPES (25 mM pH 7.5) (green points, n = 4, 14 points) and in serum (with dilution of 1/6, pink points, n = 3, 9 points). It is plotted B/B₀versus different concentrations of ENRO, which competes with BODIFLOXACIN.