Molecular modification approach on kojic acid derivatives as antioxidants related to ascorbic acid

das Neves P.A.P.F.G.; Lobato C.C.; Ferreira L.R.; Bragança V.A.N.; Veiga A.A.S.; Ordoñez M.E.; Barros V.A.; de Aguiar C.P.O.; Borges R.S. · Journal of Molecular Modeling (2020) · DOI: 10.1007/s00894-020-04580-5

Resumen

A hypothetical study by using molecular modeling for antioxidant capacity of kojic acid derivatives was performed using quantum chemistry calculations by DFT/B3LYP/6-311++G(3d,2p). Four modification approaches were considered namely simplification, functional modifications, ring regioisomerism, and hydroxylation. Molecular orbitals, single-electron transfers, hydrogen atom transfers, and spin density distributions were used for antioxidant prediction. In accordance with HOMO, LUMO, Gap, ionization potential, bond dissociation energy, and stabilization energy, the molecular simplifications of kojic acid show that enol moiety is more important for antioxidant capacity than alcohol group. Few molecular modifications on alcohol or enol position were more potent than kojic acid. The π conjugation system among ether, alkene, and hydroxyl moieties can be involved on resonance effects of better compounds. A different performance was observed on alcohol molecular modifications when compared to enol position. All lactone derivatives were more potent than kojic acid on both mechanisms, and their hydroxylated derivatives were more potent than ascorbic acid. In conclusion, the ring regioisomers and its hydroxylated derivatives have better antioxidant capacity than kojic acid. [Figure not available: see fulltext.]

Instituciones: Universidad Nacional de la Amazonía Peruana