The selective detection of Fe3+ ions using citrate-capped gold nanoparticles

Anal Biochem. 2022 Jan 15:637:114453. doi: 10.1016/j.ab.2021.114453. Epub 2021 Nov 13.

Abstract

Citrate is a ubiquitous biological molecule that functions as Fe3+ chelators in some bacteria and the blood plasma of humans. Inspired by the strong affinity between citrate and Fe3+, a colorimetric Fe3+ probe based on citrate-capped AuNPs without any additional modification was designed. Citrate-capped AuNPs with a diameter of 22 nm were applied to detect Fe3+ without other reagents' assistance. This easily-prepared and low-cost colorimetric sensor exhibited good selectivity towards Fe3+ among common metal ions, a good linear relationship in the range of 0.1-0.8 μM of Fe3+ and quick response time of 10 min.

Keywords: Colorimetric sensor; Fe(3+) ions; Gold nanoparticles; Selective detection.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Citric Acid / chemistry*
  • Colorimetry
  • Gold / chemistry*
  • Humans
  • Ions / analysis
  • Ions / chemistry
  • Iron / analysis*
  • Iron / chemistry
  • Metal Nanoparticles / chemistry*
  • Microscopy, Electron, Transmission / methods
  • Particle Size
  • Water / analysis

Substances

  • Ions
  • Water
  • Citric Acid
  • Gold
  • Iron