title: Analysis of chlorobutanol in ophthalmic ointments and aqueous solutions by reverse-phase high-performance liquid chromatography.
abstract: A reverse-phase high-performance liquid chromatographic assay for chlorobutanol was developed and found suitable for the routine analysis of ophthalmic ointments and aqueous solutions. The method utilized a column packed with 10-microns octadecylsilane with a mobile phase of methanol-water (50:50). Peak detection was by UV absorption at 210 nm. In this chromatographic system, chlorobutanol had a capacity factor (K') of 4.1. Standard curves obtained in the presence of ointment vehicle containing an aminoglycoside were linear, intercepted at zero, and averaged 99.4% recovery. Degradation studies indicated that the method was stability indicating. The analytical results for a complete experimental ophthalmic ointment and an aqueous ophthalmic diluent are presented. This high-performance liquid chromatographic method of analysis represents an alternative to GC procedures for determining chlorobutanol.
mesh_terms: D002724:Chlorobutanol / Q000032:analysis*; D002849:Chromatography, Gas / Q000379:methods; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D009824:Ointments / Q000032:analysis; D009883:Ophthalmic Solutions / Q000032:analysis; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
chemical_list: D009824:Ointments; D009883:Ophthalmic Solutions; D002724:Chlorobutanol