Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 241, Issue -, Pages 482-488Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2016.10.108
Keywords
Fluorescence switching sensor; Sinapine; Carbon quantum dots; Copper ions; Fluorescence quenching
Funding
- National Natural Science Foundation of China [31371843, 31271856]
- Agricultural Science and Technology Innovation Project of Chinese Academy of Agricultural Science (CAAS-ASTIP-OCRI)
- Earmarked Fund for China Agriculture Research System [CARS-13]
- Director Fund of Oil Crops Research Institute [1610172016003, 1610172014006]
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A new fluorescence switching sensor for sensitive detection of sinapine (SP) was developed based on aggregation and disaggregation of carbon quantum dots (CDs) with the assistance of copper ions (Cu2+). In the detection, carboxyl group on the surface of CDs enables the aggregation triggered by Cu2+ due to the effective coordination, inducing obvious fluorescence quenching. Upon the addition of SP into the solution, higher affinity between SP and Cu2+ is found to from SP-Cu coordination complex, leading to re-dispersion and fluorescence recovery of CDs. The fluorescence switching sensor for SP detection has advantages of simplicity, rapidness, high sensitivity and selectivity. The quantitative range for SP detection is from 0.04 to 5 mu g mL(-1) with the detection limit of 0.02 mu g mL(-1). In practical samples, the recoveries of the samples ranged from 87.9% to 117.0%. (C) 2016 Elsevier B.V. All rights reserved.
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