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A simple method using ion-pair high-performance liquid chromatography was established for the rapid and precise determination of synephrine in thirty three species of oriental pharmaceutical decoctions containing Aurantii Nobilis Pericarpium. An ODS column and a mixed solvent system of water, acetonitrile, sodium dodecyl sulfate and phosphoric acid as a mobile phase were used for the separation. Synephrine was eluted without interference of other coexisting components within 15 min.

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Determination of Synephrine in Oriental Pharmaceutical Decoctions Containing Aurantii Nobilis Pericarpium by Ion-Pair High-Performance Liquid Chromatography. II