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AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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STUDIA CHEMIA - Ediţia nr.2 din 2021 | |||||||
Articol: |
INVESTIGATION OF SYNERGIC/ANTI-SYNERGIC INTERACTIONS OF DIHYDROXIFUMARIC ACID AND ASCORBIC ACID WITH DPPH. Autori: CRINA VICOL, CLAUDIA CIMPOIU, GHEORGHE DUCA. |
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Rezumat: DOI: 10.24193/subbchem.2021.2.04 Published Online: 2021-06-30 Published Print: 2021-06-30 pp.49-58 FULL PDF ABSTRACT: Reaction of the free-radical 2,2-diphenyl-1-picrylhydrazyl (DPPH) with dihydroxyfumaric acid (DHF) and ascorbic acid (AA) was investigated in ethanolic media and in wine simulated matrix by using a stopped-flow system. The antioxidant activity for both acids were significantly higher in wine matrix, the observed constants (kobs) being about 3 s-1 for DHF and 0.66 s-1 for AA. Synergic and anti-synergic interactions of DHF and AA against DPPH were also investigated. A strong anti-synergic effect was noticed in ethanol (kobs < 0.35 s-1). In wine simulated matrix the constants were higher than in ethanol (kobs ≈ 1 s-1), but still too small for a synergic effect. Some explanations concerning the mechanisms of antioxidant action are proposed. Key words: dihydroxyfumaric acid, ascorbic acid, DPPH, wine matrix, stopped-flow |
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