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Lensless Fluorescent Microscopy on a Chip

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Published on: August 17, 2011

Lensless CCD-based fluorometer using a micromachined optical Söller collimator.

Joshua Balsam¹, Miguel Ossandon, Yordan Kostov

¹University of Maryland College Park (UMCP), College Park, MD 20742, USA.

|January 19, 2011

Summary

This summary is machine-generated.

We developed a simple, lensless fluorometer using a charge-coupled device (CCD) for sensitive detection. This low-cost, point-of-care system offers comparable sensitivity to ELISA plate readers for medical diagnostics.

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Area of Science:

Biomedical Engineering
Optical Instrumentation
Analytical Chemistry

Background:

Current CCD-based detection systems often rely on lenses, increasing complexity and cost.
There is a need for sensitive, low-cost, and portable diagnostic tools for point-of-care applications.

Purpose of the Study:

To develop and characterize a simple, lensless, charge-coupled device (CCD)-based fluorometer.
To demonstrate its utility for detecting specific biomarkers, such as botulinum neurotoxin serotype A (BoNT-A).

Main Methods:

Utilized a multi-wavelength LED light source and a novel Söller collimator (stack of pinholes) for excitation and light collimation.
Eliminated the need for a lens, simplifying design, reducing size, and protecting the CCD.
Integrated microfluidics for simultaneous detection of 16 samples using a Förster resonance energy transfer (FRET) assay.

Main Results:

Achieved a limit of detection (LOD) of 1.25 nM for BoNT-A, comparable to modern ELISA plate readers.
Demonstrated a compact, cost-effective device with advantages in design simplicity and portability.
Successfully detected BoNT-A activity using a specific FRET assay.

Conclusions:

The lensless CCD-based fluorometer is a sensitive and cost-effective alternative to traditional plate readers.
This technology, combined with microfluidics, holds potential for point-of-care diagnostics in resource-limited settings.
Enhances accessibility and quality of healthcare delivery through simplified, on-site medical diagnostic assays.