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Selective melamine detection in multiple sample matrices with a portable Raman instrument using surface enhanced
Laura C Mecker1, Katherine M Tyner, John F Kauffman
1US Food and Drug Administration, CDER, Division of Pharmaceutical Analysis, St. Louis, MO 63101, USA. laura.mecker@fda.hhs.gov
Analytica Chimica Acta
|June 19, 2012
Summary
A new portable method uses gold nanoparticles and surface-enhanced Raman spectroscopy (SERS) for rapid, on-site detection of melamine adulteration in food and pharmaceuticals. This technique enables field screening to protect public health from contaminated products.
Area of Science:
- Analytical Chemistry
- Materials Science
- Food Safety
Background:
- Melamine adulteration in food and pharmaceuticals poses a significant public health risk.
- Existing detection methods often require laboratory settings, limiting rapid, on-site screening capabilities.
- There is a critical need for portable, field-deployable analytical tools for melamine detection.
Purpose of the Study:
- To develop a universal and selective portable method for detecting melamine in various solid matrices.
- To establish an on-site, rapid testing approach for melamine adulteration using surface-enhanced Raman spectroscopy (SERS).
- To ensure public safety by enabling early detection of contaminated food and pharmaceutical products.
Main Methods:
- Utilized gold nanoparticles (Au NPs) for surface-enhanced Raman spectroscopy (SERS) analysis.
- Developed a melamine extraction procedure using non-hazardous solvents suitable for field applications.
- Investigated the formation of Au NP agglomerates with isopropanol (IPA) to enhance Raman signals and minimize matrix interference.
Main Results:
- Achieved selective detection of melamine at concentrations as low as 100-200 μg L⁻¹.
- Demonstrated a significant melamine Raman signal enhancement of 10⁵ through the use of Au NP agglomerates.
- Successfully screened melamine adulteration in diverse matrices including milk powder, infant formula, and whey protein.
Conclusions:
- Developed the first portable SERS method using Au NPs for selective melamine screening in food and pharmaceutical products.
- The method allows for minimal sample preparation and rapid, on-site analysis, facilitating field-based detection.
- This technology offers a promising solution for safeguarding public health against melamine contamination.
