Development of a Method for Antioxidant Activity Analysis Using Iron Oxide Nanoparticles

Authors

  • Patcharaporn Thongsook Department of Chemistry, Faculty of Science, Burapha University, Chon Buri, Thailand 20131
  • Yupaporn Sameenoi Department of Chemistry, Faculty of Science, Burapha University, Chon Buri, Thailand 20131

Abstract

This work presents an iron oxide nanoparticles (Fe3O4 NPs) for antioxidant activity analysis for the first time. The analysis of antioxidant activity is based on quenching ability of the antioxidant to the reactive oxygen species produced from the reaction of Fe3O4 NPs and H2O2 which are normally react with 3,3’,5,5’tetramethylbenzidine (TMB) resulting in color change. In the presence of antioxidant, the reactive oxygen species are captured resulting in lower degree of color intensity of TMB which is proportional to the antioxidant activity. Firstly, Fe3O4 NPs concentration and reaction time were optimized. Using optimal condition, gallic acid, used as an antioxidant standard, was analyzed using the developed method to study the analytical performance and antioxidant behavior. The linearity was in the concentration range of 0.2-0.8 mM with a limit of detection of 0.2 mM. The reproducibility from the analysis of GA at concentrations of 0.2, 0.5 and 0.6 mM was observed with the relative standard deviation (% RSD) in the range of 6.6 - 16.1 % (n = 5). Finally, the developed method was validated against the traditional DPPH assay from antioxidant activity analysis of 7 fruit samples.  The results showed that the antioxidant activity obtained from the two methods were well correlated indicating that the developed method is promising to be an alternative method for antioxidant activity analysis in real samples.                                               Keywords : iron oxide nanoparticles, antioxidants, peroxidase-like activity

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Published

2018-11-20