METAL COMPLEXES OF PHENOLIC COMPOUNDS FROM PURPLE CONEFLOWER
DOI:
https://doi.org/10.15421/jchemtech.v33i1.315146Keywords:
hydroxycinnamic acids, herbal preparation, lead and cadmium ions, metal complexes, absorption and reflectance spectra, colorimetryAbstract
The results of the study of the ability of purple coneflower Echinacea purpurea (L.) Moench preparations to bind to Pb(II) and Cd(II) are presented. Complex formation involving the catechol site of phenolic compounds in extracts and herbal preparation was confirmed using the spectrophotometric method. The presence of a pronounced long-wavelength maximum in the difference absorption spectra confirmed the formation of a more conjugated chromophore system due to the coordination of metal ions. Complexes of phenolic compounds with Pb(II), Cd(II) and Pb(II)+Cd(II) were obtained using extracts of rhizomes with roots and aerial parts. The methods of reflectance spectroscopy in the visible range and colorimetry were used to characterize the preparations. The complex structure of the band with the presence of a longer-wavelength maximum in the solid phase compared to solutions is associated with the formation of a more conjugated chromophore system. This fact can be explained by the property of chicory acid (predominant component) to self-assemble into various supramolecular structures with the possibility of stacking interaction of catechol fragments. The established chelating ability expands the idea of the biological activity of echinacea preparations, which can provide metal-ligand homeostasis during chelation therapy in case of intoxication of the body with various metals. The results obtained can be used to obtain promising materials from renewable plant raw materials.
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