Figure 4:Effect of ACN % on the retention of sulfaquinoxaline sodium (Sulf) (20 g/ml), vitamin K3 (Vit K) (10 g/ml), and amprolium hydrochloride (Ampro) (20 g/ml). Mobile phase consisting of ACN and 0.2M NH4AC solution adjusted to pH of 5.7; flow rate=0.5 ml/min; ?=263 nm; the ACN% is as shown in the figure.