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D‑Penicillamine‑Stabilized Gold Nanoclusters as a Selective Fluorescent Sensor for Tetracyclines.

Luis Marco-Sabater1, Elena Zaballos-García1, Jorge Escorihuela2

  • 1Departamento de Química Orgánica, Facultad de Farmacia y Ciencias de la Alimentación, Universidad de Valencia, Avda. Vicent Andrés Estellés 22, Burjasot, 46100, Valencia, Spain.

Journal of Fluorescence
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Summary

A new method uses gold nanoclusters (AuNCs) to detect tetracycline antibiotic residues in water. This simple, cost-effective sensor offers sensitive and selective monitoring for environmental safety.

Keywords:
FluorescenceGoldNanoclusterSensorTetracycline

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Area of Science:

  • Environmental Chemistry
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Antibiotic residues in water pose environmental risks due to extensive use in livestock.
  • Simple, rapid, and cost-effective sensing methods are needed for monitoring water contamination.

Purpose of the Study:

  • To develop a facile synthesis of gold nanoclusters (AuNCs) for detecting tetracycline antibiotic residues.
  • To create a sensitive, selective, and cost-effective optical sensor for water quality monitoring.

Main Methods:

  • Synthesized D-penicillamine-stabilized gold nanoclusters (AuNC@D-Pen).
  • Utilized the fluorescence quenching of AuNC@D-Pen in the presence of tetracycline for detection.
  • Evaluated sensor selectivity against common interfering species.

Main Results:

  • Achieved intense and stable fluorescence emission centered at ~650 nm.
  • Determined a detection limit of 2.0 µM (0.9 ppm) for tetracycline.
  • Demonstrated excellent selectivity for tetracyclines over anions, metal ions, and amino acids.

Conclusions:

  • AuNC@D-Pen provides an efficient platform for rapid, selective, and affordable detection of antibiotic contaminants.
  • The developed sensor is a promising tool for routine water-quality monitoring.
  • This method addresses the critical need for effective environmental monitoring of antibiotic residues.