DOI: 10.3390/molecules28176316 ISSN:

A Chitosan-Based Fluorescent Probe Combined with Smartphone Technology for the Detection of Hypochlorite in Pure Water

Xushuo Yuan, Wenli Zhang, Li Liu, Yanfei Lin, Linkun Xie, Xijuan Chai, Kaimeng Xu, Guanben Du, Lianpeng Zhang
  • Chemistry (miscellaneous)
  • Analytical Chemistry
  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Molecular Medicine
  • Drug Discovery
  • Pharmaceutical Science

Using chitosan as a raw material, 1,8-naphthimide as the fluorescent chromophore, and sulfur-containing compounds as the recognition groups, a novel naphthimide-functionalized chitosan probe, CS-BNS, for the detection of ClO− was successfully synthesized. The modification of chitosan was verified by SEM, XRD, FTIR, mapping, 13C-NMR, TG and the structure of the probe molecule was characterized. The identification performance of the probes was studied using UV and fluorescence spectrophotometers. The results show that CS-BNS exhibits a specific response to ClO− based on the oxidative reaction of ClO− to the recognition motifs, as well as a good resistance to interference. And the probe has high sensitivity and fast response time, and can complete the detection of ClO− in a pure water system within 60 s. The probe can also quantify ClO− (y = 30.698x + 532.37, R2 = 0.9833) with a detection limit as low as 0.27 μM. In addition, the combination of the probe with smartphone technology enables the visualization and real-time monitoring of ClO−. Moreover, an identification system for ClO− was established by combining the probe with smartphone technology, which realized the visualization and real-time monitoring of ClO−.

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