A distinctive near-infrared fluorescence turn-on probe for rapid, sensitive and chromogenic detection of sulfite in food

• Published in: Dyes and pigments Vol. 162; pp. 459 - 465
• Main Authors: Duan, Chong, Zhang, Jun-Feng, Hu, Yubo, Zeng, Lintao, Su, Dongdong, Bao, Guang-Ming
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2019
• Subjects: Chromogenic probe; Colorimetric; Fluorescent probe; Naked-eye detection; Near-infrared; Sulfite; Sulfite; Chromogenic probe; Fluorescent probe; Near-infrared; Naked-eye detection; Colorimetric
• ISSN: 0143-7208; 1873-3743
• DOI: 10.1016/j.dyepig.2018.10.057

Sodium sulfite (Na2SO3) is widely used as a food additive, but the excessive residue of SO32− in food can cause irritative effects and damages to the human body. In this study, we reported a novel near-infrared (NIR) fluorescent probe (DCMQ) for visual detection of SO32− based on a chromogenic reaction. The probe can quantitatively determine SO32− with high specificity and sensitivity, fast response (<50 s) as well as a low detection limit (31.6 nM). A 1,4-Michael addition reaction was proposed for the sensing mechanism of this probe, which was confirmed by 1H NMR and HR-MS spectra. The probe has been successfully utilized to determine SO32− in food with good recovery, remarkable chromogenic effect and NIR fluorescence turn-on response. Furthermore, the probe has been prepared as a reagent kit for instant on-site visual detection of SO32− in food. Therefore, this probe has great potential application for the detection of SO32− in food. [Display omitted] •A novel NIR fluorescence probe DCMQ for SO32− is developed.•The probe showed fast response toward SO32− (˂ 50 s) with high selectivity and low detection limit.•The probe displayed observable chromogenic reaction from yellow to purple and NIR fluorescence turn-on response toward SO32−.•The probe DCMQ was successfully used as a reagent kit to visually determine SO32− in food samples.