title: Bare silica as a reverse-phase stationary phase: liquid chromatographic separation of antihistamines with buffered aqueous organic mobile phases.
abstract: Unbonded silica gel is an effective support for reverse-phase liquid chromatographic separations of lipophilic amines. Simple buffered aqueous-organic mobile phases provide rapid isocratic separations of antihistamines. Phenylpropanolamine hydrochloride, chlorpheniramine maleate, and dextromethorphan hydrobromide are separated in 8 min on bare silica with a mobile phase of 75% methanol and 25% water which is 0.01 M in (NH4)2HPO4. Quantitation is reproducible. A wide variety of additional compounds may be separated using the same mobile phase.
mesh_terms: D002853:Chromatography, Liquid / Q000379:methods; D006633:Histamine Antagonists / Q000302:isolation & purification*; D058428:Silica Gel; D012822:Silicon Dioxide; D013056:Spectrophotometry, Ultraviolet; D013607:Tablets
chemical_list: D006633:Histamine Antagonists; D013607:Tablets; D058428:Silica Gel; D012822:Silicon Dioxide