Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 413, Issue 9, Pages 2565-2575Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-021-03221-x
Keywords
Carbon dots; Fluorescence method; Tetracyclines; Visual recognition; Test strip sensors
Funding
- National Natural Science Foundation of China [21765014, 21864018]
- Science and Technology Innovation Platform Project of Jiangxi Province [20192BCD40001]
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Concentration-dependent photoluminescence carbon dots were synthesized through hydrothermal treatment, providing a new direction for the real-time detection of tetracycline. The CDs exhibited high fluorescence quantum yield, water solubility, and stability, enabling visually identifiable and quantitative determination of tetracyclines with high sensitivity and wide linear relationships.
Concentration-dependent photoluminescence carbon dots (CDs) have been successfully synthesized through the one-step hydrothermal treatment of o-phthalic acid and ethylenediamine. The CDs possessed higher fluorescence quantum yield, up to 39.22%, exhibiting distinguished optical property, water solubility, and stability. The CDs that emit strong blue-green fluorescence can visually identify and determine tetracycline (TC), oxytetracycline (OTC), and chlortetracycline (CTC). TC quenched the fluorescence of CDs at 500 nm owing to the inner filter effect; OTC behaved similarly, but the emission wavelength of CDs was red-shifted to 515 nm. Inversely, once CTC was introduced to CDs solution, the fluorescence increased and the emission peak was blue-shifted to 450 nm. Bandgap transition and electrostatic interaction were proposed to be the mechanisms for the detection of OTC and CTC by CDs. Wide linear relationships were established for TC, OTC, and CTC with the limits of detection to be 50 nM, 36 nM, and 373 nM, respectively. Furthermore, the nanoscale probe constructed by this system has been applied to detect tetracyclines (TCs) in complex samples with satisfying recoveries (93.2-114%) and was designed as a portable test strip sensor for visually on-site TCs of honey sample screening. Accordingly, the preparation process of the nano fluorescent probe is simple and environmentally friendly, and the probe has a specific recognition ability for tetracyclines. The synthesized CDs in this work provide a new orientation for fast, effective, and visual real-time detection of tetracycline in actual samples.
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