METHOD FOR QUANTITATIVE DETERMINATION OF WATER-SOLUBLE VITAMINS B AND B BY VOLTAMMETRY ON ORGANO-MODIFIED ELECTRODES Russian patent published in 2013 - IPC G01N27/48 

FIELD: chemistry.

SUBSTANCE: in the method for quantitative determination of water-soluble vitamins B₁, B₂ by stripping voltammetry, said vitamins are transferred from a sample into a solution and voltammetric accumulation of vitamins B₁, B₂ is carried out in a stirred solution for 30-60 s with electrolysis potential of B₁ of minus 0.7-0.9 V, B₂ - minus 0.4-0.6 V relative a saturated silver chloride electrode on background electrolyte B₁ - 0.1 M Na₂HPO₄, B₂ - 0.01 M HCl with subsequent recording of anode peaks in differential mode of recording the voltage versus current curve with potential sweep rate of 20-30 mV/s; concentration of vitamins B₁ and B₂ is determined from the peak height in the potential range B₁ - minus 1.2-1.4 V, B₂ - minus 0.15-0.35 V by adding standardised mixtures.

EFFECT: wider range of determined concentrations and rapid determination of vitamins B₁, B₂ by stripping voltammetry.

1 tbl, 2 ex