Synthesis, Characterization, and Low-Toxicity Study of a Magnesium(II) Complex Containing an Isovanillate Group

Autor(es):Mostrar menos -

Marchi, Rafael C. ^[1] ; Silva, Eldevan S. ^[1] ; Santos, Josenilton J. ^[1] ; Guiloski, Izonete C. ^[2] ; de Jesus, Hugo Cesar R. ^[1] ; de Aguiar, Inara ^[1] ; Kock, Flavio V. C. ^[1] ; Venancio, Tiago ^[1] ; da Silva, Maria Fatima G. F. ^[1] ; Fernandes, Joao Batista ^[1] ; Vital, Maria A. B. F. ^[2] ; Souza, Leonardo Castro ^[2] ; Silva de Assis, Helena C. ^[2] ; Skibsted, Leif H. ^[3] ; Carlos, Rose M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Quim, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Fed Parana, Dept Farmacol, Setor Crencias Biol, BR-81531980 Curitiba, Parana - Brazil

^[3] Univ Copenhagen, Dept Food Sci UCPH FOOD, DK-1958 Frederiksberg - Denmark

• Tipo de documento: Artigo Científico
• Fonte: ACS OMEGA; v. 5, n. 7, p. 3504-3512, FEB 25 2020.
• Citações Web of Science: 0

Resumo

The beneficial effect of polyphenols and magnesium(II) against oxidative stress motivated our research group to explore the antioxidant activity of phenMgIso, an aqueous soluble magnesium(II) complex containing 1,10-phenanthroline (phen) and isovanillic acid (Iso) as ligands. Combined electrospray ionization-mass spectrometry and DOSY-NMR techniques identified two complexes in methanolic solution: hexacoordinated {[}Mg(phen)(2)(Iso)](+) and tetracoordinated {[}Mg(phen)-(Iso)](+). The cyclic voltammogram of phenMgIso in the anodic region showed a cyclic process that interrupts the isovanillic acid degradation, probably by stabilization of the corresponding phenoxyl radical via complexation with Mg(II), which is interesting for antioxidant applications. phenMgIso competes with 2,2,6,6-tetramethylpiperidine by O-1(2) with IC50(O-1(2)) = 15 mu g m(-1) and with nitrotetrazolium blue chloride by superoxide ions (IC50(O-2 center dot(-)) = 3.6 mu g mL(-1)). Exposure of both zebrafish (2 mg L-1) and wistar male rats (3 mg kg(-1) day(-1) dose for 21 days) to phenMgIso does not cause mortality or visual changes compared with the respective control groups, thus phenMgIso could be considered safe under the conditions of this study. Moreover, no significant changes in comparison to both control groups were observed in the biochemical parameters on the brain-acetylcholinesterase activity, digestive tract enzyme catalase, and glutathione-S-transferase. Conversely, the performance of superoxide dismutase activity in wistar male rats increased in the presence of a complex, resulting in enhanced capacity of rats for superoxide radical enzymatic scavenging. The synergistic action of phenMgIso may be explained by the strong electrostatic interaction between Mg(II) and the O,O(phenolate) group, which makes the Iso ligand easier to oxidize and deprotonate, generating a cyclic stable species under oxidative conditions. (AU)

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