FIELD: chemical industry. SUBSTANCE: described is method according to which alkaloid extract or fraction of said extract, when the latter is not aqueous solution yet, is dissolved in water, pH value of aqueous alkaloid is determined to alkali value. Extraction of liquid in liquid is carried out with ether, and organic phase is separated from aqueous phase. There is almost completely alkaloid- lupanine present in organic phase, whereas other alkaloids present in original extract are in aqueous phase. EFFECT: more efficient isolation method. 14 cl, 1 ex
