Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 216, Issue -, Pages 572-577Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2015.04.095
Keywords
Quinoline derivatives; Copper ion; Turn on; Fluorescent probe; Highly selectivity
Funding
- Scientific Research Fund of Zhejiang Provincial Education Department [Y201431756]
- Zhejiang Provincial Natural Science Foundation of China [LQ15B060005]
- National Natural Science Foundation of China [21302063]
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A new probe PQ comprising quinoline as a fluorophore and 2-picolinic group as a recognition unit is designed and synthesized with high sensitivity and selectivity toward copper ion. The probe PQ shows almost no fluorescence in HEPES buffer (20 mM, pH 7.0), but displays obvious fluorescence enhancement after the addition of Cu2+, this response is considered to be attributed to the Cu2+-promoted hydrolysis of PQ to yield a highly fluorescent product, 2-methyl-7-hydroxy-quinoline with fluorescence signal greatly amplified. The probe PQ exhibits remarkable selectivity and sensitivity toward Cu2+ and the detection limit is as low as 0.15 p,M. These results reveal that PQ has the potential to discriminate Cu2+ over other cations in neat aqueous solution by fluorescence turn-on response. In addition, the cell imaging experiment indicated the probe PQ can be used as a possible sensor to detect Cu2+ in living cells. (C) 2015 Elsevier B.V. All rights reserved.
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