FIELD: chemistry.
SUBSTANCE: juice or extract of anthocyanin-containing vegetables or fruits or a combination thereof is loaded into the ion-exchange column. A selective isolation of anthocyanins in said column is carried out using a solvent of a selected pH, starting from the difference in charge and polarity of the anthocyanin molecules. One fraction or combination of fractions containing isolated anthocyanins is selected which, when in the form of an aqueous solution at pH 8.0, have a maximum absorption of 615 to 635 nm.
EFFECT: method makes it possible to obtain fractions containing mixtures of anthocyanins that provide colour characteristics similar to those provided by a synthetic blue dye.
17 cl, 10 dwg, 6 tbl, 4 ex
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