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Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor

Ultrasensitive Detection of Biomarkers by Using a Molecular Imprinting Based Capacitive Biosensor

Published on: February 16, 2018

Multichannel wireless-electrodeless quartz-crystal microbalance immunosensor.

Hirotsugu Ogi¹, Hironao Nagai, Yuji Fukunishi

¹Graduate School of Engineering Science, Osaka University, Machikaneyama 1-3, Toyonaka, Osaka 560-8531, Japan. ogi@me.es.osakau.ac.jp

Analytical Chemistry

|April 15, 2010

Summary

We developed a wireless biosensor using quartz plates for multichannel measurements in liquids. The sensor distinguishes specific from nonspecific binding by analyzing the exponential coefficient of frequency change, not just the decrease amount.

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Area of Science:

Biomedical Engineering
Biosensing Technology
Materials Science

Background:

Quartz-crystal microbalances (QCM) are widely used for biosensing.
Traditional QCM often requires physical electrodes, limiting applications.
Noncontacting measurement methods are desirable for sensitive detection.

Purpose of the Study:

To develop a wireless, electrodeless multichannel QCM biosensor.
To enable simultaneous detection of multiple analytes in liquids.
To improve the discrimination between specific and nonspecific binding events.

Main Methods:

Utilized quartz plates with slightly different thicknesses for multichannel operation.
Employed antenna wires for noncontacting excitation and detection of shear vibrations.
Immobilized various receptor proteins on quartz surfaces for specific analyte capture.
Measured fundamental resonance frequencies between 43 and 55 MHz for up to 10 channels in liquids.

Main Results:

Successfully demonstrated wireless, electrodeless multichannel QCM operation in liquids.
Achieved simultaneous measurement of vibrations across multiple channels.
Identified the exponential coefficient of frequency change as a key parameter for distinguishing specific from nonspecific binding.
Showcased the biosensor's capability to detect antigen-antibody reactions.

Conclusions:

The developed wireless-electrodeless multichannel QCM biosensor offers a novel approach for label-free detection.
The method of analyzing the exponential coefficient of frequency change enhances assay specificity.
This technology holds potential for various diagnostic and research applications requiring sensitive, multiplexed biomolecule detection.