METHOD OF EXTRACTING VITAMINS B AND B FROM AQUEOUS SOLUTION Russian patent published in 2020 - IPC B01D11/04 C07C227/40 

FIELD: chemistry.

SUBSTANCE: invention relates to analytical chemistry, in particular to analysis of organic compounds, and can be used in development of extraction and separate determination of vitamins B₂ and B₆. Method involves preparation of a water-salt solution of a mixture of vitamin B₂ with concentration of 4.5–5.0 mg/cm³ and vitamin B₆ with concentration of 3.5–5.5 mg/cm³, content of salting-out agent – ammonium sulphate in solution of 20–25 wt%. Solution is extracted for 10–15 minutes at temperature 21±1 °C using a solution of a copolymer of N-vinylformamide with 1-vinyl-3,5-dimethylpyrazole (VF-VDMP) with concentration of 0.15 g/cm³, with ratio of volumes of water-salt mixture of vitamins and copolymer 10:3. Then the aqueous phase is separated from organic phase and centrifuged for 5–10 minutes at 5,000 rpm. Content of vitamins in the water phase is determined, distribution coefficients D and degree of extraction R (%) of vitamins are calculated.

EFFECT: high degree of extraction of vitamins B₂ and B₆ from aqueous solution without using harmful organic solvents.

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