Azomethine-H as a Highly Selective Fluorescent Probe for Fe3+ Detection in 100% Aqueous Solution and Its Application in Living Cell Imaging

doi:10.1007/s40242-015-5163-6

Abstract

Abstract:

A simple assay for the detection of Fe³⁺ in water by means of fluorescence spectroscopy was developed based on a commercially available reagent, Azomethine-H(A-H), allowing sensing trace levels of Fe³⁺ with high selectivity over other cations. A significant fluorescence quenching of A-H at 424 nm was found after its binding with Fe³⁺ in 100% aqueous solution at pH=7.0, while other physiologically relevant metal ions posed little interference. The fluorescence responses can be well described by the modified Stern-Volmer equation. A good linear relationship(R²=0.9904) was observed up to 1.6×10^-5 mol/L Fe³⁺ ions. The detection limit, calculated via the 3σ IUPAC(international union of pure and applied chemistry) criteria, was 1.95×10^-7 mol/L. Moreover, the colorimetric and fluorescent response of A-H to Fe³⁺ can be conveniently detected by the naked eye, providing a facile method for visual detection of Fe³⁺. The proposed method was used to determine Fe³⁺ in water samples. Moreover, inverted fluorescence microscopy imaging using human umbilical vein endothelial cells shows that A-H can be used as an effective fluorescent probe for detecting Fe³⁺ in living cells.

Key words: Azomethine-H, Fe³⁺, Fluorescence probe, Detection, Cell imaging

YU Fang, QIN Liyuan, SHANG Zhuobin, DONG Zhenming, WANG Yu, JIN Weijun. Azomethine-H as a Highly Selective Fluorescent Probe for Fe³⁺ Detection in 100% Aqueous Solution and Its Application in Living Cell Imaging[J]. Chemical Research in Chinese Universities, 2015, 31(6): 919-924.

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Azomethine-H as a Highly Selective Fluorescent Probe for Fe³⁺ Detection in 100% Aqueous Solution and Its Application in Living Cell Imaging

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