Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 290, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2022.122298
Keywords
Reactive oxygen species (ROS); Hypochlorite; Stokes shift; Ratiometric; Reaction-based sensing
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Two fluorescent probes were synthesized to detect hypochlorite ions in food and industrial samples. Probe 1 showed excellent ratiometric response, while probe 2 exhibited turn-off fluorescent response. These probes have diverse practical applications.
Being one of the important reactive oxygen species (ROS), hypochlorite ions (ClO-) are involved in the control of several pathological and physiological processes. However, overexpression of ClO-may prompt several disorders including cancer. Therefore, two fluorescein functionalized compounds with catechol (probe 1) and 2-naphthyl (probe 2) as substituents were synthesized through Schiff base reaction to recognize ClO-in food items and industrial samples. While probe 2 exhibited turn-off fluorescent response towards ClO-with limit of detection (LOD) of 86.7 nM, structurally alike probe 1 showed excellent ratiometric response with low detection limit (36.3 nM), large Stokes shift (353 nm), and 'fast' response time (15 s). 1H NMR titration experiments favored spiroring opening of probe 1 upon the reaction with ClO-. Probe 1 was successfully utilized for the monitoring of exogenous ClO-in industrial samples. Further, fabrication of probe coated fluorescent paper strips and recog- nition of ClO-in sprouting potato show diverse practical applicability of our probes.
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