Effect of Bridging Atom and Hydroxyl Position on the Antioxidant Capacity of Six Phenolic Schiff Bases

Abdelhakim Kheniche; Imededdine Kadi; Abderrahim Benslama; Samiya Rizoug; Sarra Bekri; Abdenassar Harrar

doi:10.22146/ijc.72379

Effect of Bridging Atom and Hydroxyl Position on the Antioxidant Capacity of Six Phenolic Schiff Bases

https://doi.org/10.22146/ijc.72379

Abdelhakim Kheniche^(1*), Imededdine Kadi⁽²⁾, Abderrahim Benslama⁽³⁾, Samiya Rizoug⁽⁴⁾, Sarra Bekri⁽⁵⁾, Abdenassar Harrar⁽⁶⁾

(1) Laboratory of Inorganic Materials, Faculty of Sciences, University of M’sila, 28000 M’sila, Algeria; Department of Chemistry, Faculty of Sciences, University of M’sila, 28000 M’sila, Algeria
(2) Research Unit in Medicinal Plants (URPM. 3000, Laghouat) Attached to the Research Center of Biotechnology (CRBT. 25000, Constantine)
(3) Department of Biochemistry, Faculty of Sciences, University of M’sila, 28000 M’sila, Algeria
(4) Department of Chemistry, Faculty of Sciences, University of M’sila, 28000 M’sila, Algeria
(5) Department of Chemistry, Faculty of Sciences, University of M’sila, 28000 M’sila, Algeria
(6) Laboratory of Inorganic Materials, Faculty of Sciences, University of M’sila, 28000 M’sila, Algeria
(*) Corresponding Author

Abstract

A series of new phenolic Schiff bases N,N-bis(2,3-dihydroxybenzyl-idene)-4,4’-diphenylmethane (3-DPM), and N,N-bis(2,5-dihydroxybenzylidene)-4,4’-diphenylmethane (5-DPM), for sulfide bridge N,N-bis(2,3-dihydroxybenzyl-idene)-4,4’-diphenyl sulfide (3-DPS), N,N-bis(2,5-dihydroxybenzylidene)-4,4’-diphenyl sulfide (5-DPS), N,N-bis(2,3-dihydroxybenzyl-idene)-4,4’-diphenyl disulfide (3-DPSS), and N,N-bis(2,5-dihydroxybenzylidene)-4,4’-diphenyl disulfide (5-DPSS) were synthesized by condensation of substituted 4,4’-diamino-bis-(4-aminophenyl) methane/sulfide with various substituted aldehydes. The synthesized molecules were characterized by physical data, elemental, IR and ¹H-NMR analyses. The antioxidant ability of compounds was determined through the use in vitro assays such as DPPH• scavenging, ABTS, total antioxidant capacity (TAC), hydroxyl radical OH• scavenging, and reducing power capability. The antioxidant activity of the compounds increased slightly after changing the atom bridge and hydroxyl group position. The results showed that the compound 5-DPSS exhibited superior scavenging strength against DPPH (EC₅₀ = 7.10 ± 0.16 μg/mL), whereas 3-DPSS showed the highest activity (EC₅₀ = 1.36 ± 0.08 μg/mL) when inspected by ABTS in relation to butylated hydroxyanisole (BHA) (EC₅₀ = 7.54 ± 0.67). The higher OH• activity was marked by the compound 5-DPS (EC₅₀ = 44.9 ± 3.3 μg/mL) related to BHT at (EC₅₀ = 98.73 ± 0.3 μg/mL). The compounds 5-DPM demonstrated remarkable activity both reducing power (EC₅₀ = 53.2 ± 0.3 μg/mL), and TAC assay (EC₅₀ = 620.0 ± 2.4 μg/mL). These results prove that the modification in hydroxyl group position affect the antioxidant ability of Schiff bases.

Keywords

Schiff bases; free radicals; antioxidant activity; phenolics

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DOI: https://doi.org/10.22146/ijc.72379