Figure 2

Zero-order UV absorption spectra of (a) KET (blue) (12 μg/mL), OLO (black) (40 μg/mL), benzalkonium chloride (red) (250 μg/mL), and (b) KET (blue) (8 μg/mL) and OLO (black) (2 μg/mL) and benzalkonium chloride (green) (0.2 μg/mL) in the dosage form ratio.