Pt/Au-decorated Fe-N-C nanozyme sensor array for discrimination of tea polyphenol monomers

Area of Science:

• Analytical Chemistry
• Materials Science
• Biochemistry

Background:

• Tea polyphenol monomers significantly impact tea beverage flavor and quality.
• Structural similarities among tea polyphenols pose challenges for accurate discrimination.
• Developing selective detection methods for tea polyphenols is essential for quality control.

Purpose of the Study:

• To synthesize a novel composite nanomaterial with peroxidase-mimicking activity.
• To develop a tri-channel colorimetric sensor array for discriminating four tea polyphenol monomers.
• To integrate the sensor array with a portable smartphone platform for practical food analysis.

Main Methods:

• Synthesis of composite nanomaterials using in-situ reduction of noble metal nanoparticles (Pt or Au NPs) on iron-nitrogen-doped carbon microflowers (Fe-N-C MFs).
• Development of a tri-channel colorimetric sensor array leveraging differential catalytic and inhibitory properties of tea polyphenols.
• Integration with a smartphone RGB detection platform for quantitative analysis.

Main Results:

• The synthesized Fe-N-C MFs exhibited high peroxidase-mimicking activity.
• The sensor array successfully discriminated four structurally similar tea polyphenol monomers.
• Commercial green tea beverages were accurately distinguished based on their polyphenol profiles.

Conclusions:

• The developed nanozyme-based sensor array offers a sensitive and selective method for tea polyphenol discrimination.
• The integration with a smartphone platform provides a portable and practical solution for food analysis.
• This approach demonstrates significant potential for quality assessment in the food and beverage industry.