Acrylamide molecule detection by surface-enhanced infrared absorption spectroscopy using resonant nanoantennas

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Nanotechnology

Background:

• Acrylamide is a carcinogenic food contaminant formed during high-temperature processing via the Maillard reaction.
• Regulatory bodies like EFSA highlight the need for monitoring and minimizing acrylamide levels in food.
• Current detection methods may require improvement for sensitivity and applicability to complex food matrices.

Purpose of the Study:

• To develop and validate a novel spectroscopic method for detecting acrylamide in aqueous solutions.
• To utilize Surface-Enhanced Infrared Absorption (SEIRA) spectroscopy for sensitive acrylamide detection.
• To provide a foundation for applying SEIRA to real-world food samples.

Main Methods:

• Density Functional Theory (DFT) calculations to predict acrylamide's vibrational frequencies and IR absorption.
• Design and fabrication of gold nanoantenna arrays (AuNRA) tuned to acrylamide's characteristic vibrational modes.
• Experimental application of SEIRA spectroscopy to aqueous solutions containing acrylamide.

Main Results:

• Successfully detected acrylamide in aqueous solutions using SEIRA spectroscopy.
• Demonstrated the ability to identify specific vibrational modes of acrylamide through SEIRA.
• Achieved detection limits as low as 500 ng/ml for acrylamide in water.

Conclusions:

• SEIRA spectroscopy is a promising technique for the sensitive detection of acrylamide.
• The developed method shows potential for monitoring acrylamide contamination in food industry samples.
• Further research can optimize SEIRA for complex food matrices and lower detection limits.