Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 270, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2021.120851
Keywords
Carbon dots; Quantum dots; Ratiometric fluorescence; Synchronous fluorescence; Chlorotetracycline
Categories
Funding
- National Natural Science Foundation of China [51602053]
- Joint Funds for the Innovation of Science and Technology, Fujian Province [2017Y9122]
- Natural Science Foundation of Fujian Province [2019 J01300]
- Program for New Century Excellent Talents in Fujian Province University [2018B031]
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A new ratiometric fluorescence sensor is developed for the selective detection of chlorotetracycline (CTC) using dual-mode fluorescence method, demonstrating good selectivity and sensitivity.
A new ratiometric fluorescence sensor is prepared for selective detection of chlorotetracycline (CTC) through dual-mode fluorescence method. The sensor is composed of carbon dots (CDs) with blue emission and carboxyl-modified CuInS2/ZnS quantum dots (QDs) with dark-red emission. Usually QDs are used as fluorescent probes or signal sources, but it is interesting in this strategy that CuInS2/ZnS QDs innovatively work as quenching agent to reduce the fluorescence of CDs, mainly due to the fluorescence resonance energy transfer (FRET). After the addition of CTC, the interaction between CDs and CuInS2/ZnS QDs is restrained, resulting in the fluorescence recovery of CDs, whilst the QDs' fluorescence remains unaffected. In this work, CTC is detected in the range of 0-50 mu M by conventional fluorescence and synchronous fluorescence methods under an excitation wavelength of 360 nm or Delta lambda = 90 nm, and the detection limits of the two methods are 0.46 mu M and 0.36 mu M, respectively. The designed sensor displays good selectivity compared with other tetracycline drugs with similar structure to CTC, different ions and various natural - amino acids. And the sensor can also be applied to determine CTC in tap water and milk. (C) 2022 Elsevier B.V. All rights reserved.
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