THE STUDY OF SYNTHESIS, STRUCTURE AND PROPERTIES OF FLAVONOID COMPLEXES WITH METAL IONS. 2. THE OPTIMIZATION OF THE ZINC COMPLEXATION WITH DIHYDROQUERCETIN IN AQUEOUS SOLUTIONS

Article Russian OPEN
Трофимова, Наталья Николаевна ; Столповская, Елена Владимировна ; Бабкин, Василий Анатольевич (2013)
  • Publisher: Altai State University
  • Journal: Khimiia rastitel'nogo syr'ia (Chemistry of plant raw material) (issn: 1029-5143, eissn: 1029-5151)
  • Related identifiers: doi: 10.14258/jcprm.1303091
  • Subject: dihydroquercetin, complex formation, flavonoids, kinetics of the reaction, optimization, yield of the product | комплексообразование, комплексные соединения, дигидрокверцетин, соли цинка, кинетика реакции, оптимизация, выход продукта

The kinetics of complexation zinc with dihydroquercetin in aqueous solutions have been studied for optimization the reaction. The dihydroquercetin and zinc ion concentrations were determined by spectrophotometry and titrimetric methods, respectively. The chemical formule C30H26O16Zn with Zn 9,2% and the stoichiometry of the biligand complex were determined by elemental analysis and energy-dispersive X-ray spectroscopy analysis. It was found that the initial ratio of Zn2+ and dihydroquercetin equal 2 : 1 mol and pH 5,11 were the optimal for maximum yield of the product. The reaction proceeded rapidly, the formation of bulk of the product and the stoichiometry of metal and flavonoid in compound were determined at first minute of synthesis. The begining of the complexation was observed when adjusting the pH to 5,1–6,0 when zinc salts containing anions of strong acids were used as a reagents.
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