Jul 1, 1976

Collaborative study of a spectrofluorometric assay for Rauwolfia serpentina tablets and powdered root

Journal - Association of Official Analytical Chemists
W M Smith, C C Clark


Reserpine-rescinnamine group alkaloids are extracted from Rauwolfia serpentina preparations into a dimethylsulfoxide (DMSO)-methanol mixture and diluted with 0.5N H2SO4. The chloroform extract of this solution is passed through a 0.1N NaOH-Celite column and then through a silica gel column. The weakly basic alkaloids trapped on the latter column are eluted with a methanol mixture; a portion of the eluate is treated with nitrous acid and the reserpine-rescinnamine content is determined by measuring the intensity of fluorescence of the oxidation product. The following means and standard deviations (11 collaborators) were obtained for the determination of reserpine-rescinnamine group alkaloids in 4 samples of Rauwolfia serpentina (NF reference powder, 100 mg and 50 mg commercial tablets, and a 45 mg synthetic tablet formulation) : 0.174% +/- 0.0112, 0.131% +/- 0.0047, 0.160% +/- 0.0100, and 0.153% +/- 0.0083, respectively.

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Mentioned in this Paper

Dimethyl Sulfoxide
Rauwolfia serpentina (USP)
Rauvolfia serpentina
Fluorescence Spectroscopy
Silica Measurement
Eluate Specimen

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