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Microwave-driven Synthesis of Iron Oxide Nanoparticles for Fast Detection of Atherosclerosis

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Metal oxide based multisensor array and portable database for field analysis of antioxidants.

Erica Sharpe¹, Ryan Bradley², Thalia Frasco¹

¹Clarkson University, 8 Clarkson Avenue, Potsdam, NY 13699-5810.

Sensors and Actuators. B, Chemical

|March 11, 2014

Summary

A novel paper-based sensor array using metal oxide nanoparticles enables portable, inexpensive colorimetric detection of polyphenols. This method accurately identifies and quantifies antioxidants in samples like green tea, simplifying field analysis.

Keywords:

antioxidant charge transfer complexes colorimetric readout combinatorial analysis database field analysis metal oxide portable sensors

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Area of Science:

Analytical Chemistry
Materials Science
Biochemistry

Background:

Polyphenols are crucial antioxidants found in botanical samples, but their detection and characterization can be complex.
Existing methods for antioxidant analysis may lack portability and cost-effectiveness for field applications.

Purpose of the Study:

To develop a portable, inexpensive, paper-based colorimetric sensing array for polyphenol detection.
To establish a method for field characterization of antioxidant-containing samples.
To correlate polyphenol detection with antioxidant activity.

Main Methods:

Utilized multiple metal oxide nanoparticles as active sensing materials in a sensor array.
Developed a database of polyphenol standards (e.g., epigallocatechin gallate, gallic acid, resveratrol, Trolox).
Employed a portable color reader for rapid colorimetric analysis and quantification via charge-transfer complex formation.

Main Results:

The sensor array successfully identified and quantified antioxidant constituents in botanical extracts, including green tea.
Charge-transfer complex formation correlated with polyphenol antioxidant activity.
Antioxidant activity measurements showed good comparability with the oxygen radical absorbance capacity (ORAC) assay.

Conclusions:

The developed metal oxide nanoparticle-based sensor array offers a comprehensive and accurate method for analyzing antioxidant-containing samples.
This technology simplifies plant phenolic investigations and enables on-site determination of antioxidant composition and activity in remote locations.