Blue Emissive Carbon Quantum Dots Derived from Green Tea Leaves Cultivated from Gayo High Land for Quantification of Antibiotics
DOI:
https://doi.org/10.48048/tis.2026.13254Keywords:
Carbon Quantum Dots (CQDs), Matcha leaves, Green tea leaves, Antibiotics sensor, QuantificationAbstract
Carbon Quantum Dots (CQDs) have emerged as highly attractive nanomaterials in recent decades due to their rapid, cost-effective performance in chemical detection through fluorescence quenching. This study aims to synthesize CQDs from green tea leaves (GTL-CQDs) and utilize them as sensors for antibiotics. The CQDs were synthesized using a hydrothermal method at 180 °C for 4 in an oven, followed by purification, and characterization. The synthesized GTL-CQDs exhibited an average particle size of approximately 10.5 nm. UV-Vis and fluorescence spectroscopy analyses revealed that the CQDs strongly absorb UV light with a maximum absorption peak at 273 nm, and emit visible light in the wavelength range of 350 - 550 nm, with an emission peak centered at 430 nm. The CQDs were employed to test their selectivity toward the detection of various antibiotics, including amoxicillin, cefixime, and ciprofloxacin. The GTL-CQDs were found to be effective in detecting the selected antibiotics but demonstrated greater selectivity toward cefixime with a limit of detection (LOD) of 0.11 mg·L−1 or equivalent to 243 nM. Sensing application in real samples (tap water and river water) recoveries 98.90% - 113.35% with RSD ≤ 0.19 confirmed the accuracy of cefixime quantification. The developed probe enables reliable, sustainable, and efficient on-site detection of cefixime for environmental monitoring.
HIGHLIGHTS
- High-fluorescence CQDs were hydrothermally synthesized from green tea leaves
- The CQDs persistently exhibit great optical stability after being exposed to intensive UV light (295 nm) for up to 8 h
- A low-cost UV-Vis technique has been successfully employed to detect antibiotics at a significantly low threshold
- The CQDs demonstrate sensory ability to detect cefixime with a limit of detection of 0.11 mg·L−1
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