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A simple and rapid capillary electrophoresis (CE) with electrcochemical detection (ED) method has been established for the simultaneous determination of seven active ingredients in the stems and roots of  Gaultheria leucocarpa var. yunnanensis  and its medicinal preparation, including (+)-catechin, rutin, gentisic acid, vallinic acid, salicylic acid, quercetin, and protocatechuic acid. The effects of working potential, pH, and concentration of running buffer, separation voltage, and injection time on CE-ED are systematically investigated. Under the optimum conditions, the seven analytes could be completely separated within 23 min in a borax running buffer (pH 8.7). A good linear relationship is obtained over three orders of magnitude with detection limits (signal-to-noise ratio = 3) ranging from 5 × 10 -8  g/mL to 3 × 10 -7  g/mL for the analytes. The proposed method is successfully used in the analysis of real samples after a relatively simple extraction procedure, and the assay results are satisfactory.

journal of chromatographic science

Simultaneous Determination of Active Ingredients in Ethnomedicine  Gaultheria leucocarpa var. yunnanensis  and its Medicinal Preparation by Capillary Electrophoresis with Electrochemical Detection