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Related Experiment Video

Updated: May 13, 2025

Development and Validation of an Ultrasensitive Single Molecule Array Digital Enzyme-linked Immunosorbent Assay for Human Interferon-α

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Singlicate bead-based immunoassay for biomarker quantitation in sub-microliter volume sample.

Sang Hyun Lee¹, Myeongsik Shin¹, Chang Heon Lee¹

¹Department of Chemistry, Seoul National University, Seoul, 08826, Republic of Korea.

Biosensors & Bioelectronics

|May 11, 2025

Summary

A new Forward scattering Correction Using a Single-bead (FoCUS) method enables sensitive biomarker detection from minimal sample volumes. This innovation significantly improves detection limits for point-of-care testing devices.

Keywords:

Bead-based immunoassay Forward scattering correction Microfluidics Singlicate Submicroliter analysis

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Last Updated: May 13, 2025

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Published on: June 14, 2018

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Published on: June 23, 2022

Area of Science:

Biomedical Engineering
Analytical Chemistry
Diagnostics

Background:

Point-of-care testing (PoCT) is crucial for disease diagnostics.
Detecting biomarkers from minimal sample volumes is challenging for PoCT.

Purpose of the Study:

To develop a user-friendly method for biomarker detection using minimal sample volumes.
To enhance sensitivity and reduce sample volume requirements for PoCT.

Main Methods:

Introduced Forward scattering Correction Using a Single-bead (FoCUS) platform.
Utilized tiny beads and a small chip for sample analysis.
Employed a novel signal correction strategy using simultaneous forward scattering signals.

Main Results:

Achieved a 1000-fold reduction in required sample volume.
Decreased relative standard deviation of sample signals by 2.7-fold.
Improved detection limits by 4.3-fold.
Successfully detected myoglobin from 0.1 μL of sample.

Conclusions:

FoCUS significantly reduces sample volume requirements for biomarker detection.
The platform demonstrates high sensitivity and improved detection limits for PoCT.
FoCUS shows potential for multiplex biomarker immunoassays in resource-limited settings.