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- W2037628056 abstract "Pseudoephedrine hydrochloride (I), brompheniramine maleate (II), and dextromethorphan hydrobromide (III) in a cough-cold syrup were separated and determined by ion-pair reversed-phase high-pressure liquid chromatography. The separation was carried out using a μBondapak C18 column (30 cm X 3.9 mm i.d.) and a mobile phase of acetonitrile-water-acetic acid (40:60:1) with 0.01 N 1-octanesulfonic acid sodium salt and 0.05 N potassium nitrate. Detection was accomplished using a UV detector at 265 nm for I and II; III was monitored at 280 nm. Concentration versus peak height plots in the ranges of 0.37-1.9 mg/ml for I,0.025-0.126 mg/ml for II, and 0.125-0.625 mg/ml for III were linear. Ten consecutive injections of a mixture gave a percent relative standard deviation of <1% for all three components. Average recoveries from laboratory-prepared samples were 100.5% for I, 100.9% for II, and 100.1% for III. No precolumn cleanup was necessary, and the chromatogram was complete in 16 min." @default.
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- W2037628056 title "Ion-pair Reversed-phase High-pressure Liquid Chromatography of Cough-cold Syrups I: Pseudoephedrine Hydrochloride, Brompheniramine Maleate, and Dextromethorphan Hydrobromide" @default.
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- W2037628056 doi "https://doi.org/10.1002/jps.2600681137" @default.
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