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Design and Development of Aptamer–Gold Nanoparticle Based Colorimetric Assays for In-the-field Applications
Published on: June 23, 2016
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Highly sensitive colorimetric assay for penconazole using gold nanostar-graphene quantum dot composite
Zahra Abolghasemi-Fakhri1, Mohammad Amjadi2
1Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, 5166616471, Iran.
Summary
A new colorimetric method uses gold nanostar@graphene quantum dot (AuNS@GQD) nanocomposites for sensitive penconazole detection. This sensing strategy prevents etching, enabling accurate quantification of penconazole in water samples.
Area of Science:
- Nanomaterials Science
- Analytical Chemistry
- Environmental Science
Background:
- Penconazole is a widely used fungicide.
- Sensitive and reliable detection methods for penconazole are crucial for environmental monitoring.
- Existing detection methods may lack simplicity or sensitivity.
Purpose of the Study:
- To develop a simple and sensitive colorimetric method for penconazole sensing.
- To utilize a gold nanostar@graphene quantum dot (AuNS@GQD) nanocomposite as a nanoprobe.
- To investigate an etching/anti-etching strategy for sensing applications.
Main Methods:
- Employing AuNS@GQD nanocomposite as a sensing nanoprobe.
- Utilizing periodate (IO4-) as an etching agent.
- Observing color changes from green to violet due to etching and prevention of these changes by penconazole.
Main Results:
- The method demonstrated a strong linear relationship (R² = 0.999) between wavelength shift and penconazole concentration (5.0–1000.0 nM).
- A low limit of detection (LOD) of 1.5 nM was achieved.
- The sensor showed stability, reproducibility, and high recovery rates (>97%) in spiked water samples.
Conclusions:
- The developed colorimetric method offers a simple, sensitive, and reliable approach for penconazole detection.
- The etching/anti-etching mechanism based on AuNS@GQD nanocomposite is effective for sensing.
- This method holds promise for practical applications in environmental water sample analysis.
