Ratiometric fluorescent platform for on-site monitoring of sodium pyrosulfite in preserved fruits

• Published in: Food chemistry Vol. 459; p. 140367
• Main Authors: Sun, Depeng, Ji, Yuefeng, Sun, Xinyao, Li, Guanhao, Liu, Zhixue, Piao, Chunxiang
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 30.11.2024
• Subjects: Actual sample; Fluorescent Dyes - chemistry; Food Contamination - analysis; Food Preservation - instrumentation; Food Preservation - methods; Fruit - chemistry; Limit of Detection; Preserved fruits; Ratiometric fluorescent probe; Smartphone detection; Sodium pyrosulfite; Spectrometry, Fluorescence - methods; Sulfites - analysis; Sulfites - chemistry; PBS; DMSO; EDC; Ratiometric fluorescent probe; Sodium pyrosulfite; DCM; Preserved fruits; HRMS; NMR; UV–Vis; HOBt; Actual sample; NOESY; Smartphone detection
• ISSN: 0308-8146; 1873-7072; 1873-7072
• DOI: 10.1016/j.foodchem.2024.140367

The rapid detection of pyrosulfites in food chemistry is crucial to food safety and health. Here, a coumarin-type ratiometric fluorescent probe was developed based on the Michael addition reaction to detect sodium pyrosulfite (Na2S2O5). The probe exhibited high selectivity and fast response (t1/2 = 6 s) to Na2S2O5 and a low detection limit (26 nM). Because of its excellent ratiometric response performance, the probe was successfully applied to measure the amount of Na2S2O5 in preserved fruits. Colour information analysis and formula calculations were performed to quickly determine the sodium pyrosulfite amount in an actual sample by using a smartphone. Therefore, the intelligent strategy of combining the sensing process and smartphone provides a convenient and efficient method for the fast monitoring of sodium metabisulfite in actual food. [Display omitted] •A coumarin-type ratiometric fluorescent probe was synthesized to detect Na2S2O5.•The probe identified Na2S2O5 with fast response time (t1/2 = 6 s) and low detection limit (26 nM).•Using RGB analysis and formula application, the Na2S2O5 content can be calculated.•Smartphone-based on-site detection of Na2S2O5 in actual samples was achieved.