Abstract
From an ethanolic extract of the rhizome of Coptis groenlandica (Oeder) Fern, and by subsequent column chromatography using a discontinuous gradient elution technique, berberine and two other alkaloids were obtained, namely alkaloid A and alkaloid B. Evidence accumulated from the melting points, the elemental analysis and the ultraviolet, infrared, nuclear magnetic resonance and mass spectra, alkaloid A (structure I) appeared to be a structural isomer of coptisine and the name isocoptisine is proposed, whereas alkaloid B (structure III) appeared to be a methoxy–hydroxy derivative of coptisine.
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