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Article Abstract
Sulfite (HSO) and hypochlorous acid (HClO) serve as essential food additives and key raw materials in bleaching agents. However, excessive consumption of these compounds may disrupt cellular redox homeostasis, leading to a series of adverse physical effects. Therefore, the development of reliable analytical methods to detect HSO and HClO levels in food products is of significant importance. In this study, we developed a hemicyanine dye-based fluorescent probe (TBA) for the sensitive and selective detection of HSO and HClO. The probe incorporates distinct recognition sites (a CC bond for HSO and an -NH group for HClO) operating in different solvent systems to enable dual-analyte discrimination. TBA exhibited excellent sensitivity, with detection limits (LOD) of 1.1 μM for HSO (60 min response) in water and 10.7 μM for HClO (40 s response) in ethanol. Furthermore, the probe was successfully adapted into a portable test strip format, demonstrating reliable quantification in real samples (recovery: 88.97-104.88 %). In addition, TBA displayed mitochondria-targeted capability, allowing its application in live cells HSO imaging.
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