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A simple and precise method was established for the simultaneous determination of evodiamine and rutaecarpine in oriental pharmaceutical decoctions containing Evodia Fruit using high-performance liquid chromatography with sodium dodecyl sulfate (SDS) as an ion-pair reagent. Evodiamine and rutaecarpine were eluted within 60 min without interference from co-existing components using an ODS column and a mixture of water-methanol-acetonitrile-SDS-phosphoric acid (600:330:70:5:0.01, v/v/v/w/v, pH 5.0) as a mobile phase.

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A Simultaneous Determination of Evodiamine and Rutaecarpine in Oriental Pharmaceutical Decoctions Containing Evodia Fruit by Ion-Pair High-Performance Liquid Chromatography