METHOD OF DETECTING ASCORBIC ACID IN WATER SOLUTION Russian patent published in 2009 - IPC G01N33/00 G01N21/78 B01D11/00 

FIELD: chemistry.

SUBSTANCE: invention relates to analytic chemistry of organic compounds concerning elaboration of processes of vitamin isolation and separation. Method includes preparation of water-salt solution of ascorbic acid by its dissolving in saturated desalter solution, extraction of ascorbic acid, analysis of equilibrium water phase, as desalter for preparation of water-salt solution of ascorbic acid, saturated solution of ammonium sulphate or sodium sulphite is used; water-salt solution of ascorbic acid is prepared with pH 5, for which purpose weighed portion of ascorbic acid with weight 1 mg, measured on analytic scales, is carried to measuring flask, which has volume 100 ml, and bring to the mark with saturated solution of ammonium sulphate or sodium sulphite, extraction of ascorbic acid is carried out by water solution of polymer poly-N-vinylpyrrolidone with concentration 10^-5 mole/l with ratio of polymer solution and water-salt solution volumes 1:5.

EFFECT: increased degree of ascorbic acid extraction from water solution and increase of analysis safety.

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