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Related Experiment Video

Updated: Jul 3, 2026

Computer Numerical Control Micromilling of a Microfluidic Acrylic Device with a Staggered Restriction for Magnetic Nanoparticle-Based Immunoassays
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Micro-machined piezoelectric membrane-based immunosensor array.

Ting Xu1, Zhihong Wang, Jianmin Miao

  • 1Micromachines Centre, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.

Biosensors & Bioelectronics
|July 29, 2008
PubMed
Summary

This study presents a micro-machined piezoelectric biosensor array for immunoassay applications. The developed immunosensor demonstrates potential for detecting specific antigens and antibodies through frequency changes.

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Area of Science:

  • Biosensor Technology
  • Micro-Electro-Mechanical Systems (MEMS)
  • Immunochemistry

Background:

  • Immunoassays are crucial for disease diagnosis.
  • Piezoelectric biosensors offer high sensitivity for detecting biomolecular interactions.
  • Micro-machining enables miniaturization and array integration of biosensors.

Purpose of the Study:

  • To develop and characterize a micro-machined piezoelectric membrane-based biosensor array.
  • To evaluate the sensor's performance for immunoassay applications.
  • To assess the feasibility of using resonant frequency shifts for quantifying biomolecular binding.

Main Methods:

  • Immobilization of probe molecules (goat immunoglobulin G and HBsAg) onto micro-machined piezoelectric membranes.
  • Detection of target analytes (anti-goat IgG and anti-HBsAg) via antigen-antibody binding.
  • Measurement of resonant frequency changes using an impedance analyzer.

Main Results:

  • The biosensor array exhibited mass-sensitive detection, with frequency shifts ranging from 100 to 700 Hz.
  • The mass sensitivity of the device was determined to be approximately 6.25 Hz/ng.
  • A near-linear correlation was observed between frequency change and goat IgG concentration, allowing for mass calculation of bound antibodies.

Conclusions:

  • The micro-machined piezoelectric membrane-based biosensor array shows significant potential as a sensitive immunosensor.
  • The device's ability to detect biomolecular binding through resonant frequency shifts is demonstrated.
  • This technology could be applied to various immunoassay diagnostic applications.