Premium
A ratiometric fluorescent chemosensor for the detection of cysteine in aqueous solution at neutral pH
Author(s) -
Li Yuanyuan
Publication year - 2017
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.3334
Subject(s) - benzothiazole , fluorescence , chemistry , detection limit , cysteine , aqueous solution , stoichiometry , photochemistry , selectivity , linear range , chromatography , organic chemistry , catalysis , physics , quantum mechanics , enzyme
A ratiometric fluorescent chemosensor 2‐(2′‐hydroxy‐3′‐formyl‐5′‐methoxyphenyl)benzothiazole ( 1 ) was developed for the detection of cysteine (Cys). In aqueous solution at neutral pH, 1 exhibited a ratiometric fluorescent response to Cys with a remarkable red‐to‐green shift in the emission wavelength. This fluorescence change was attributed to the cyclization reaction between the formyl group in 1 and the amino and sulfhydryl group in Cys in a stoichiometry of 1: 1 according to the proposed mechanism. At neutral pH, 1 displayed a significant fluorescence ratio signal enhancement with the addition of Cys. Furthermore, 1 showed good selectivity toward Cys. The detection limit and linear range were 5.6 and 0–100 μmol/L, respectively, which demonstrated that 1 could recognize relatively low concentrations of Cys and is a good candidate for applications in detecting Cys.