Development of an Fe²⁺ sensing system based on the inner filter effect between upconverting nanoparticles and ferrozine.

ABSTRACT: The ferrozine (FZ) assay is a vital oxidation state-specific colorimetric assay for the quantification of Fe²⁺ ions in environmental samples due to its sharp increase in absorbance at 562 nm upon addition of Fe²⁺. However, it has yet to be applied to corresponding fluoresence assays which typically offer higher sensitivites and lower detection limits. In this article we present for the first time its pairing with upconverting luminescent nanomaterials to enable detection of Fe²⁺via the inner filter effect using a low-power continuous wave diode laser (45 mW). Upon near infra-red excitation at 980 nm, the overlap of the upconversion emission of Er³⁺ at approximately 545 nm and the absorbance of the FZ:Fe²⁺ complex at 562 nm enabl

SUBMITTER: Abramson R 

PROVIDER: S-EPMC10475975 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature