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"Switch-Off-On" Detection of Fe³⁺ and F^- Ions Based on Fluorescence Silicon Nanoparticles and Their Application to Food Samples.

ABSTRACT: An approach to the detection of F^- ions in food samples was developed based on a "switch-off-on" fluorescence probe of silicon nanoparticles (SiNPs). The fluorescence of the synthetic SiNPs was gradually quenched in the presence of Fe³⁺ ion and slightly recovered with the addition of F^- ion owing to the formation of a stable and colorless ferric fluoride. The fluorescence recovery exhibited a good linear relationship (R² = 0.9992) as the concentration of F^- ion increased from 0 to 100 μmol·L^-1. The detection limit of the established method of F^- ion was 0.05 μmol·L^-1. The recovery experiments confirmed the accuracy and reliability of the proposed method. The ultraviolet-visible spectra, fluorescence decays, and zeta potentials evidenced the fluorescence quenching mechanism involving the electron transfer between the SiNPs and Fe³⁺ ion, while the fluorescence recovery resulted from the formation of ferric fluoride. Finally, SiNPs were successfully applied to detect F^- ions in tap water, Antarctic krill, and Antarctic krill powder.

SUBMITTER: Ye H

PROVIDER: S-EPMC8779261 | biostudies-literature |

REPOSITORIES: biostudies-literature

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