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A highly sensitive poly(chrysoidine G)-gold nanoparticle composite based nitrite sensor for food safety applications
Sajid Ali Ansari1, Nasrin Siraj Lopa, Nazish Parveen
1Department of Physics, College of Science, King Faisal University, P.O. Box 400, Hofuf, Al-Ahsa 31982, Saudi Arabia. sansari@kfu.edu.sa.
Analytical Methods : Advancing Methods and Applications
|November 23, 2020
Summary
This study developed a novel sensor using poly(chrysoidine G) and gold nanoparticles on a fluorine-doped tin oxide electrode for sensitive nitrite detection. The sensor shows high accuracy and potential for analyzing biological and food samples.
Area of Science:
- Electrochemistry
- Nanomaterials Science
- Analytical Chemistry
Background:
- Nitrite (NO2-) is a crucial analyte in biological and food systems.
- Accurate electrochemical detection of nitrite is essential for various applications.
- Developing sensitive and reliable nitrite sensors remains a key challenge.
Purpose of the Study:
- To develop a highly sensitive electrochemical sensor for nitrite detection.
- To utilize poly(chrysoidine G) (PCG) and gold nanoparticles (AuNPs) for enhanced sensor performance.
- To evaluate the sensor's applicability in real-world samples like food.
Main Methods:
- Fabrication of a fluorine-doped tin oxide (FTO) electrode modified with PCG nanoparticles.
- Anchoring of AuNPs onto the PCG/FTO electrode via chemical reduction.
- Electrochemical characterization and performance evaluation for nitrite oxidation.
- Testing the sensor's response in food samples for reproducibility and interference.
Main Results:
- The developed AuNP/PCG/FTO electrode demonstrated excellent electrocatalytic activity for nitrite oxidation.
- Achieved high sensitivity (0.63 μA cm⁻²μM⁻¹) and a low limit of detection (0.095 μM) for nitrite.
- The sensor exhibited good reproducibility, repeatability, low interference, and strong recovery in food samples.
Conclusions:
- The AuNP/PCG/FTO nanocomposite electrode is a promising platform for sensitive and selective electrochemical nitrite detection.
- The sensor's performance is suitable for analyzing nitrite levels in complex matrices such as food.
- This approach holds potential for the electrochemical detection of other biologically significant compounds.
