| 摘要 |
FIELD: analytical chemistry of organic compounds; in particular quality controlling of alcohol products. ^ SUBSTANCE: claimed method includes catechol extraction from ground oak wood with organic solvent aqueous solution followed by determination of content thereof, wherein as organic solvent ethanol aqueous solution is used in ethanol/water ratio of 50:50. Then catechols are concentrated into organic phase at pH 2.0-3.0; ammonium sulfate is added in amount of 18-20 % based of probe mass and catechols are determined by extract conductance-measuring titration. Catechol content in aqueous alcohol solution as calculated to quercetine is determined according formula wherein C is catechol concentration in solution, g/dm3; C(PB(NO3)2) is molar concentration of titrant equivalent, g/dm3; V(PB(NO3)2) is titrant volume required for catechol titration, cm3; Mk - molar mass of quercetine, g/mol; Ve - extract volume, cm3; r is equilibrium volume ratio of aqueous and organic phases; R is catechol recovery degree in ethanol/aqueous-salt solution, % (96). ^ EFFECT: simplified and inexpensive method with increased selectivity, and enhanced applications. ^ 9 ex, 2 tbl, 1 dwg |
