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Rapid highly sensitive general protein quantification through on-chip chemiluminescence.

Hoi Kei Chiu¹, Tadas Kartanas¹, Kadi L Saar¹

¹Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom.

Biomicrofluidics

|May 13, 2021

Summary

Researchers developed a novel chemiluminescence assay for sensitive protein detection. This simple, excitation source-free method achieves picomolar sensitivity, overcoming limitations of existing techniques.

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Area of Science:

Biochemistry
Analytical Chemistry
Biotechnology

Background:

Traditional protein detection methods like spectroscopy and colorimetric assays have limited sensitivity (micromolar concentrations).
Existing assays often require signal amplification or complex detection systems, hindering simplicity and accessibility.
There is a need for a universally applicable, highly sensitive protein detection method that is easy to implement.

Purpose of the Study:

To establish a chemiluminescence-based protein detection assay with enhanced sensitivity.
To develop a simple, universal protein characterization method without signal amplification or complex optics.
To enable protein quantification over a wide dynamic range using a straightforward approach.

Main Methods:

Developed a chemiluminescence assay targeting primary amines in proteins.
Utilized a chemiluminescence readout, eliminating the need for an excitation source.
Employed a simple optical setup consisting of an objective and a detection element.

Main Results:

Achieved quantitative protein detection over five orders of magnitude.
Demonstrated a high sensitivity limit down to picomolar (pM) concentrations.
The assay requires no washing steps due to its latent nature.

Conclusions:

The developed chemiluminescence assay offers a simple, universal, and highly sensitive strategy for protein detection.
This method overcomes the sensitivity limitations of conventional assays.
Its ease of implementation and excitation source-free operation make it suitable for various research applications.