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Related Experiment Video

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Iridium Oxide-reduced Graphene Oxide Nanohybrid Thin Film Modified Screen-printed Electrodes as Disposable Electrochemical Paper Microfluidic pH Sensors

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Microfluidic Line-Free Mass Sensor Based on an Antibody-Modified Mechanical Resonator.

Masaki Yamaguchi¹

¹Department of Mechanical Engineering & Robotics, Graduate School of Science & Technology, Shinshu University, 3-15-1 Tokida, Ueda, Nagano 386-8567, Japan. masakiy@shinshu-u.ac.jp.

|November 15, 2018

Summary

This study introduces a novel line-free mass sensor using microfluidics and label-free techniques for sensitive, reusable measurements. The sensor accurately analyzes salivary cortisol, enabling high-throughput point-of-care testing.

Keywords:

cortisol high-throughput label-free mass sensor microfluidic power supply line saliva

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Area of Science:

Biosensing
Microfluidics
Mechanical Resonators

Background:

Traditional mass sensors often require power supply lines, limiting their application.
Label-free techniques enhance sensitivity but can be complex.
Microfluidic systems offer precise sample handling and reusability.

Purpose of the Study:

To develop a line-free mass sensor integrating microfluidics and label-free detection.
To improve sensor sensitivity, reusability, and enable high-throughput analysis.
To demonstrate the sensor's capability for analyzing human salivary cortisol.

Main Methods:

Fabrication of a disk-shaped mechanical resonator (4 mm diameter, 0.5 mm thickness) using photolithography.
Integration of a piezoelectric element for vibration excitation, creating a line-free design.
Incorporation of a microfluidic mechanism for rapid sample washing and reusability.

Main Results:

Achieved a high Q-factor of 7748 and resonance frequency of 1.402 MHz, even in liquid environments.
Demonstrated successful analysis of human salivary cortisol concentration.
Validated sensor reusability through effective microfluidic washing protocols.

Conclusions:

The microfluidic line-free mass sensor is suitable for accurate salivary hormone analysis.
The sensor's high-throughput capability makes it ideal for point-of-care testing.
The developed sensor offers a sensitive, reusable, and power-independent solution for biosensing.