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Simultaneous determination of methyl, ethyl, propyl, and butyl 4-hydroxybenzoates and 4-hydroxybenzoic acid in liquid antacid formulations by gas chromatography. 1984

G W Schieffer, and P J Palermo, and S Pollard-Walker

An isothermal chromatographic (GC) method employing an SE-30 column and flame-ionization detection has been developed for the simultaneous assay of methyl, ethyl, propyl, and butyl 4-hydroxybenzoates and 4-hydroxybenzoic acid in liquid antacid formulations. The method, which uses a silica column chromatographic cleanup step prior to GC, is specific for the compounds with respect to possible degradation products, impurities, and excipients.

UI MeSH Term Description Entries
D011310 Preservatives, Pharmaceutical Substances added to pharmaceutical preparations to protect them from chemical change or microbial action. They include ANTI-BACTERIAL AGENTS and antioxidants. Pharmaceutic Aids (Preservatives),Pharmaceutic Preservative,Pharmaceutic Preservatives,Pharmaceutical Preservative,Pharmaceutical Preservatives,Preservative, Pharmaceutic,Preservative, Pharmaceutical,Preservatives, Pharmaceutic
D002849 Chromatography, Gas Fractionation of a vaporized sample as a consequence of partition between a mobile gaseous phase and a stationary phase held in a column. Two types are gas-solid chromatography, where the fixed phase is a solid, and gas-liquid, in which the stationary phase is a nonvolatile liquid supported on an inert solid matrix. Chromatography, Gas-Liquid,Gas Chromatography,Chromatographies, Gas,Chromatographies, Gas-Liquid,Chromatography, Gas Liquid,Gas Chromatographies,Gas-Liquid Chromatographies,Gas-Liquid Chromatography
D004355 Drug Stability The chemical and physical integrity of a pharmaceutical product. Drug Shelf Life,Drugs Shelf Lives,Shelf Life, Drugs,Drug Stabilities,Drugs Shelf Life,Drugs Shelf Live,Life, Drugs Shelf,Shelf Life, Drug,Shelf Live, Drugs,Shelf Lives, Drugs
D000863 Antacids Substances that counteract or neutralize acidity of the GASTROINTESTINAL TRACT. Alkalinizing Agent,Antacid,Alkalinizing Agents,Agent, Alkalinizing,Agents, Alkalinizing
D062385 Hydroxybenzoates Benzoate derivatives substituted by one or more hydroxy groups in any position on the benzene ring. Hydroxybenzoic Acids,Acids, Hydroxybenzoic

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