Synthesis, characterization and antioxidant activity copper–quercetin complex
| Autor: | S. Birjees Bukhari, Shahabuddin Memon, Muhammad Iqbal Bhanger, M. Mahroof-Tahir |
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| Rok vydání: | 2009 |
| Předmět: |
Magnetic Resonance Spectroscopy
Antioxidant Spectrophotometry Infrared Macromolecular Substances DPPH medicine.medical_treatment Flavonoid Models Biological Antioxidants Analytical Chemistry chemistry.chemical_compound medicine Transition Temperature Organic chemistry Chelation Instrumentation Spectroscopy chemistry.chemical_classification Molecular Structure Ligand Free Radical Scavengers Atomic and Molecular Physics and Optics chemistry Thermogravimetry Proton NMR Quercetin Spectrophotometry Ultraviolet Methanol Copper Nuclear chemistry |
| Zdroj: | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy. 71:1901-1906 |
| ISSN: | 1386-1425 |
| Popis: | 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, 1H 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. |
| Databáze: | OpenAIRE |
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