Rational Design of A NIR Ratiometric Fluorescent Probe with Large Stokes Shift for Sulfite Detection

Abstract

Sulfite (SO3 2−), as an SO2 derivative and important reactive sulfur, plays a vital role in the food industry and various physiological processes. So, it is urgent to seek out an effective method for SO3 2− detection. This work, inspired by the increase of electron-donating groups or electron-withdrawing groups in the molecular structure has a significant effect on the shift of fluorescence emission spectrum, and the nucleophilic addition reaction of SO3 2− to C=C double bond can make a noticeable change in fluorescence spectra. Two cyanine-based fluorescent probes BBHy and NBHy were reasonably designed and synthesized. Among them, near-infrared emitting NBHy with large Stokes shift (277 nm) and fluorescence intensity change in the presence of SO3 2− was selected, and then NBHy displayed superior recoveries for SO3 2− detection in food samples. Besides, NBHy was also successfully applied for SO3 2− sensing in living cells through dual-channel fluorescence imaging, which confidently confirmed the feasibility of our probe design.

YSZ-Based Mixed Potential Type Sensors Utilizing Pd-doped SrFeO3 Perovskite Sensing Electrode to Monitor Sulfur Dioxide Emission

“…At present, numerous researches have been conducted to develop SO 2 sensors using different kinds of gas sensors including resistance type, 5,12,13 electrochemical type, 14,15 optical, [16][17][18] field-effect transistor (FET) sensors. 19,20 In the exhaust gas environment of diesel engines, however, the SO 2 sensors operate at extremely harsh conditions especially the high temperature rapidly fluctuating between 200 °C and 500 °C, as well as the oxygen concentration fluctuation.…”