Journal
DYES AND PIGMENTS
Volume 197, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2021.109918
Keywords
Fluorescence indicator; Fluoride sensor; Displacement sensor; Calix[4]pyrrole
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Cost-effective fluorescence turn-on indicator-displacement-assay (IDA) sensors based on octamethylcalix[4] pyrrole receptor and tetrabutylammonium salts of 4-methylumbelliferone and fluorescein indicators were developed for highly sensitive detection of fluoride anion. The IDA sensors demonstrated rapid and selective sensitivity towards fluoride, with color change observed in the 4-methylumbelliferone system. The fluorescein-based IDA sensor showed a detection limit as low as 3.2 nM for fluoride anion detection.
Cost-effective fluorescence turn-on indicator-displacement-assay (IDA) sensors based on octamethylcalix[4] pyrrole receptor and tetrabutylammonium salts of 4-methylumbelliferone and fluorescein indicators were developed for highly sensitive detection of fluoride anion. The IDA sensor assembly relies on the hydrogen bonding between calix[4]pyrrole and carboxylate units of indicators and further displacement replacement of receptors with target analyte. While all the sensors displayed rapid and selective sensitivity towards fluoride over the other anions, 4-methylumbelliferone based IDA system was also found to have a visual color change for the sensing of fluoride anion. The experimental results revealed that fluorescein-based IDA sensor could be used for the sensing of fluoride anion with a detection limit as low as 3.2 nM.
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