The methods for the determination of Aconitum alkaloids in Radix Aconiti Kusnezoffii were established. Volumetric analysis with the indicator of methyl red-bromcresol green and colorimetric analysis with acid dye of bromecresol green under the wavelength of 416 nm were used for the assay of total alkaloids. Colorimetric analysis of hydroxamic acid-Fe was for the assay of total ester-diterpene type Aconitum alkaloids. Three kinds of diester-diterpene type Aconitum alkaloids (aconitine, hypaconitine and mesaconitine) were determined by HPLC method. The HPLC system consisted of C18 as the stationary phase and acetonitrile: buffer (acetic acid-triethylamine, pH 6.25) = 71:29 as the mobile phase. The wavelength was 235 nm.

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