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A reversed-phase liquid chromatographic procedure with a micellar mobile phase of sodium dodecyl sulfate (SDS), containing a small amount of pentanol, was developed for the control of 7 antihistamines of diverse action in pharmaceutical preparations (tablets, capsules, powders, solutions, and syrups): azatadine, carbinoxamine, cyclizine, cyproheptadine, diphenhydramine, doxylamine, and tripelennamine. The retention times of the drugs were &amp;lt;9 min with a mobile phase of 0.15M SDS–6% (v/v) pentanol. The recoveries with respect to the declared compositions were in the range of 93–110%, and the intra- and interday repeatabilities and interday reproducibility were &amp;lt;1.2%. The results were similar to those obtained with a conventional 60 + 40 (v/v) methanol–water mixture, with the advantage of reduced toxicity, flammability, environmental impact, and cost of the micellar-pentanol solutions. The lower risk of evaporation of the organic solvent dissolved in the micellar solutions also increased the stability of the mobile phase.

journal of aoac international

Quantitation of Antihistamines in Pharmaceutical Preparations by Liquid Chromatography with a Micellar Mobile Phase of Sodium Dodecyl Sulfate and Pentanol