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Published on: August 23, 2024
Synthesis, characterization and antioxidant activity copper-quercetin complex
S Birjees Bukhari1, Shahabuddin Memon, M Mahroof-Tahir
1Free Radical Research Laboratory, National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan. birjees_bukahri2k4@yahoo.com
Abstract:
Quercetin (3,3',4',5,7-pentahydroxyflavone) one of the most abundant dietary flavonoids, has been investigated in the presence of Cu(II) in methanol. The spectroscopic studies (UV-vis, (1)H NMR and IR) were useful to assess the relevant interaction of Quercetin with Cu(II) ions, the chelation sites and dependence of the complex structure from the metal/ligand ratio. A 1:2 (L:M) complex was indicated by Job's method of continuous variation, which was applied to ascertain the stoichiometric composition of the complex. The antioxidant activities of the compounds were evaluated by using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging method. The complexed flavonoid was much more effective free radical scavengers than the free flavonoids.
