Preparation, characterization and antioxidant evaluation of Cu(II) and Zn(II) tannates
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Data
2018
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Introduction:
The interest in the antioxidant materials increased due to their free radical scavenging properties avoiding various pathologies.
Tannic Acid (TA) is known to have high free radical scavenging activity, but its application is still limited.
This paper had the objective of synthesis, characterization and evaluation of free radical scavenging activity of TA associated with
Cu (II) and Zn (II) ions, in a buffered aqueous medium.
Methods and Materials:
Techniques of FTIR, simultaneous TG-DSC characterized the obtained compounds, and the evaluation of free radical scavenging
activity was made using 2,2–diphenyl–1–picrylhydrazyl (DPPH) radical. The FTIR analysis of the compounds showed significant
displacement of the main bands in the TA spectrum (νC=O, δO-H, σO-H), suggesting an association of metal ions with the oxygen of
the hydroxyl group of TA. TG-DSC curves showed information about the thermal stability, stoichiometry, hydration water, and
residues formation.
Results and Conclusion:
The TA association with the metal ions Cu(II) and Zn(II) decreased the antioxidant activity of the molecule significantly, showing
that these compounds could be potentially used as pro-oxidant agents.
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Thermal analysis, Tannic acid, Copper, Zinc, Antioxidant, Characterization
Citação
COSTA, Gessyca G. et al. Preparation, characterization and antioxidant evaluation of Cu(II) and Zn(II) tannates. Open Chemistry Journal, Amsterdam, v. 5, p. 158-171, 2018. DOI: 10.2174/1874842201805010158. Disponível em: https://benthamopen.com/ABSTRACT/CHEM-5-158. Acesso em: 27 out. 2023.