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Related Experiment Video

Updated: May 14, 2026

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

Attomolar protein detection using a magnetic bead surface coverage assay.

H Cumhur Tekin¹, Matteo Cornaglia, Martin A M Gijs

¹Laboratory of Microsystems, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland.

|February 9, 2013

Summary

This study introduces a microfluidic method for highly sensitive protein detection in serum. The technique uses magnetic beads to capture and quantify antigens, achieving sub-zeptomole sensitivity for biomarkers like Tumor Necrosis Factor-alpha.

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Microsampling in Targeted Mass Spectrometry-Based Protein Analysis of Low-Abundance Proteins

Microsampling in Targeted Mass Spectrometry-Based Protein Analysis of Low-Abundance Proteins

Published on: January 13, 2023

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Last Updated: May 14, 2026

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Rapid Homogeneous Detection of Biological Assays Using Magnetic Modulation Biosensing System

Published on: June 13, 2010

Microsampling in Targeted Mass Spectrometry-Based Protein Analysis of Low-Abundance Proteins

Microsampling in Targeted Mass Spectrometry-Based Protein Analysis of Low-Abundance Proteins

Published on: January 13, 2023

Area of Science:

Biotechnology
Analytical Chemistry
Microfluidics

Background:

Accurate protein detection in serum is crucial for disease diagnosis.
Existing methods often lack the sensitivity required for early-stage biomarker identification.

Purpose of the Study:

To develop a novel microfluidic method for ultra-sensitive protein detection in serum.
To achieve detection limits in the sub-zeptomole range for specific protein biomarkers.

Main Methods:

Utilized antibody-functionalized magnetic beads (2.8 μm) for antigen capture from serum under microfluidic mixing.
Employed magnetic dipole-dipole interactions between large and small (1.0 μm) antibody-coated beads to enhance immunocomplex formation.
Leveraged viscous drag forces to minimize non-specific binding of large beads.

Main Results:

Demonstrated efficient antigen-antibody recognition and binding, mimicking biological adhesion processes.
Achieved protein detection down to the sub-zeptomole range.
Successfully detected as few as 200 molecules of Tumor Necrosis Factor-alpha (TNF-α) in 5 μL of serum (60 attomolar).

Conclusions:

The developed microfluidic method offers ultra-sensitive protein quantification in serum.
This technique provides a sensitive platform for detecting low-abundance protein biomarkers.
The method has potential applications in early disease detection and diagnostics.