Evaluation of synergistic antioxidant potential of complex mixtures using oxygen radical absorbance capacity (ORAC) and electron paramagnetic resonance (EPR)

Tory L. Parker, Samantha A. Miller, Lauren E. Myers, Fernando E. Miguez, Nicki J. Engeseth

Research output: Contribution to journalArticle

Abstract

Previous research has demonstrated that certain combinations of compounds result in a decrease in toxic or pro-oxidative effects, previously noted when compounds were administered singly. Thus, there is a need to study many complex interactions further. Two in vitro techniques [electron paramagnetic resonance (EPR) and oxygen radical absorbance capacity (ORAC) assays] were used in this study to assess pro- and antioxidant capacity and synergistic potential of various compounds. Rutin, p-coumaric acid, abscisic acid, ascorbic acid, and a sugar solution were evaluated individually at various concentrations and in all 26 possible combinations at concentrations found in certain foods (honey or papaya), both before and after simulated digestion. EPR results indicated sugar-containing combinations provided significantly higher antioxidant capacity; those combinations containing sugars and ascorbic acid demonstrated synergistic potential. The ORAC assay suggested additive effects, with some combinations having synergistic potential, although fewer combinations were significantly synergistic after digestion. Finally, ascorbic acid, caffeic acid, quercetin, and urate were evaluated at serum-achievable levels. EPR analysis did not demonstrate additive or synergistic potential, although ORAC analysis did, principally in combinations containing ascorbic acid.

Original languageEnglish (US)
Pages (from-to)209-217
Number of pages9
JournalJournal of Agricultural and Food Chemistry
Volume58
Issue number1
DOIs
StatePublished - Jan 13 2010

Keywords

  • Ascorbic acid
  • Combination
  • EPR
  • Flavonoid
  • Fruit
  • Honey
  • ORAC
  • Papaya
  • Phenolic acid
  • Synergistic

ASJC Scopus subject areas

  • Chemistry(all)
  • Agricultural and Biological Sciences(all)

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