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NO Fluorescence Quantification by Chitosan CdSe Quantum Dots Nanocomposites.

Eliana F C Simões1, João M M Leitão1, Joaquim C G Esteves da Silva2

  • 1Faculdade de Farmácia da Universidade de Coimbra, Pólo das Ciências da Saúde, Centro de Investigação em Química da Universidade do Porto (CIQ-UP), 3000-548, Coimbra, Portugal.

Journal of Fluorescence
|December 12, 2013
PubMed
Summary

This study presents a novel sensor for quantifying nitric oxide (NO) using cadmium/selenium quantum dots. The optimized sensor demonstrates sensitive detection of NO, crucial for various biological and chemical applications.

Keywords:
ChitosanFluorescenceNanocompositesNitric oxideQuantum dotsQuenching

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Area of Science:

  • * Nanomaterials Science
  • * Analytical Chemistry
  • * Sensor Technology

Background:

  • * Nitric oxide (NO) is a critical signaling molecule in biological systems.
  • * Accurate quantification of NO is essential for research and diagnostics.
  • * Existing NO detection methods may have limitations in sensitivity or specificity.

Purpose of the Study:

  • * To develop and optimize a novel nanocomposite sensor for NO quantification.
  • * To evaluate the performance of the sensor using multivariate experimental design.
  • * To assess the sensor's selectivity against other reactive species.

Main Methods:

  • * Fabrication of a nanocomposite sensor using cadmium/selenium quantum dots (CdSe), chitosan (CS), and mercaptosuccinic acid (MSA).
  • * Optimization of sensor response using multivariate response surface experimental design.
  • * Fluorescence quenching assay for NO detection.
  • * Evaluation of sensor performance with standard solutions and a NO donor reagent.

Main Results:

  • * Optimized sensor response achieved at pH 5.5 and room temperature.
  • * Demonstrated a wide linear working range for NO quantification (5–200 μM).
  • * Achieved a low limit of detection (1.86 μM) for NO.
  • * Showed better quantification results using a NO donor reagent.
  • * Assessed cross-reactivity with other reactive oxygen and nitrogen species.

Conclusions:

  • * The CS-CdSe-MSA nanocomposite sensor offers a sensitive and reliable method for NO quantification.
  • * The sensor exhibits a broad linear range and a low limit of detection.
  • * The optimized sensor shows potential for accurate NO measurements in various applications.