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Design and Development of Aptamer–Gold Nanoparticle Based Colorimetric Assays for In-the-field Applications
Published on: June 23, 2016
Bare gold nanoparticles as facile and sensitive colorimetric probe for melamine detection
Wei Chen1, Hao-Hua Deng, Lei Hong
1Department of Pharmaceutical Analysis, Fujian Medical University, Fuzhou 350004, China. chenandhu@163.com
The Analyst
|October 6, 2012
Summary
A new colorimetric assay uses bare gold nanoparticles to detect melamine in infant formula with high sensitivity. This simple method offers a rapid, on-site screening tool for melamine adulteration.
Area of Science:
- Analytical Chemistry
- Nanotechnology
- Food Safety
Background:
- Melamine adulteration in food products, particularly infant formula, poses significant health risks.
- Existing detection methods for melamine can be complex, costly, and time-consuming.
Purpose of the Study:
- To develop a highly sensitive and simple colorimetric assay for melamine detection.
- To utilize bare gold nanoparticles (AuNPs) for enhanced melamine detection in infant formula.
Main Methods:
- Preparation of bare gold nanoparticles via borohydride reduction.
- Colorimetric detection of melamine based on the interaction with surface-bound AuCl(4)(-)/AuCl(2)(-) ions on bare AuNPs.
- Analysis of melamine in infant formula samples.
Main Results:
- The assay demonstrated a low detection limit of 2.0 × 10(-7) g L(-1) for melamine.
- The sensitivity was approximately 1000-fold higher compared to using citrate-capped gold nanoparticles.
- The method requires no complex sample pretreatment or nanoparticle modification.
Conclusions:
- The proposed colorimetric assay provides a sensitive, simple, and rapid method for melamine detection.
- This technique offers a viable alternative for on-site and real-time screening of melamine adulteration in infant formula.
- The use of bare AuNPs enhances the colorimetric detection of melamine effectively.
