Simple and rapid silver nanoparticles based antioxidant capacity assays: Reactivity study for phenolic compounds

Food Chem. 2018 Aug 1:256:342-349. doi: 10.1016/j.foodchem.2018.02.141. Epub 2018 Feb 26.

Abstract

A single-step, rapid (10 min), sensitive silver nanoparticles (AgNPs) based spectrophotometric method for antioxidant capacity (AOC) assay has been developed. The assay is based on the ability of natural polyphenols to reduce Ag(I) and stabilize the produced AgNPs(0) at room temperature. Localized surface plasmon resonance (LSPR) of AgNPs at ≈420 nm is then measured. Using different conditions of pH (8.4) and temperature (45 °C) a further assay based on the production of AgNPs with selectivity for flavonols was also developed. The reactivity of the two AgNPs based assays vs. 15 polyphenols belonging to different chemical classes and 9 different samples has been studied and compared with ABTS, Folin and AuNPs based methods for AOC. The proposed assays had good reproducibility (RSD ≤ 13) and are simple, sensitive and cost effective. Moreover, used in conjunction with the classical AOC assays, can improve the information on the polyphenolic pool of food samples.

Keywords: Antioxidant capacity (AOC) assay; Food; Gold nanoparticles (AuNPs); Nanomaterials; Polyphenols; Silver nanoparticles (AgNPs).

Publication types

  • Evaluation Study

MeSH terms

  • Antioxidants / chemistry*
  • Chemistry Techniques, Analytical / methods*
  • Metal Nanoparticles / chemistry*
  • Plant Extracts / chemistry
  • Polyphenols / chemistry*
  • Reproducibility of Results
  • Silver / chemistry*
  • Surface Plasmon Resonance

Substances

  • Antioxidants
  • Plant Extracts
  • Polyphenols
  • Silver
  • folin