Pushing the detection limits: strategies towards highly sensitive optical-based protein detection.

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Biotechnology

Background:

• Proteins are key functional molecules in cells, crucial for understanding health and disease.
• Detecting low-abundance proteins in biofluids is vital for early disease diagnostics, such as cancer and neurological disorders.
• Conventional protein detection methods (ELISA, mass spectrometry, western blotting) often lack the required sensitivity for certain applications.

Purpose of the Study:

• To critically review strategies for enhancing the sensitivity of antibody-based protein assays using optical micro- and nano-biosensors.
• To synthesize and compare various methods for improving the limits of detection in protein quantification.
• To discuss future perspectives in ultrasensitive disease diagnostics and rare protein detection.

Main Methods:

• Review of recent advances in optical micro- and nano-biosensor technologies for protein detection.
• Analysis of strategies including assay miniaturization, enhanced antibody binding, sample purification, and signal amplification.
• Comparative assessment of the pros and cons of different sensitivity-enhancing methods.

Main Results:

• Optical biosensors show promise for single-molecule protein detection, enabling ultrasensitive diagnostics.
• Various strategies can significantly improve assay sensitivity, overcoming limitations of conventional techniques.
• A comprehensive comparison of different approaches provides insights into their effectiveness and applicability.

Conclusions:

• Miniaturized optical biosensors represent a powerful tool for ultrasensitive protein detection and early disease diagnosis.
• Further research and development in assay optimization and signal amplification are crucial for clinical translation.
• This review provides a valuable resource for researchers in the field of biosensing and biomarker discovery.