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Updated: Jun 30, 2026

A Liquid Phase Affinity Capture Assay Using Magnetic Beads to Study Protein-Protein Interaction: The Poliovirus-Nanobody Example

A Liquid Phase Affinity Capture Assay Using Magnetic Beads to Study Protein-Protein Interaction: The Poliovirus-Nanobody Example

Published on: May 29, 2012

Bioselective agglutination induced nanoscale deterministic lateral displacement.

Kuan Yu Hsieh^1,2,3, Joshua T Smith¹, Sung-Cheol Kim⁴

¹IBM T.J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, Yorktown, NY 10598, USA. bhwunsch@us.ibm.com.

|April 14, 2025

Summary

This study introduces a novel bead-based immunoassay using nanoscale deterministic lateral displacement (nanoDLD) for size separation. The technique effectively aggregates and separates particles, enabling target protein detection with high bioselectivity.

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Published on: June 23, 2022

Area of Science:

Biotechnology
Microfluidics
Analytical Chemistry

Background:

Nanoscale deterministic lateral displacement (nanoDLD) is a microfluidic technique for separating subcellular particles like DNA and extracellular vesicles.
Existing research extensively studies nanoDLD separation mechanisms but lacks systematic analysis of migration angle shifts caused by particle aggregation.

Purpose of the Study:

To develop and validate a bead-based immunoassay for aggregating and separating particles using nanoDLD.
To investigate the impact of target protein presence on particle aggregation and separation dynamics.
To demonstrate the bioselectivity and detection capabilities of the developed nanoDLD immunoassay.

Main Methods:

Development of a bead-based immunoassay integrated with nanoDLD technology.
Utilizing the nanoDLD system to separate aggregated particles based on size and binding interactions.
Employing an agglutination model to analyze migration angle shifts in relation to antigen-antibody concentrations.

Main Results:

The nanoDLD immunoassay successfully separated aggregated particles.
The system demonstrated significant bioselectivity, distinguishing target proteins.
The agglutination model accurately explained particle migration angles as a function of antibody and antigen concentrations, enabling target protein detection.

Conclusions:

The developed nanoDLD immunoassay offers an effective method for size-based separation and detection of target proteins through induced aggregation.
The study validates the use of an agglutination model to predict and understand particle behavior in nanoDLD systems.
This approach holds promise for sensitive and selective biomarker detection in various biological applications.