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Optofluidic laser for dual-mode sensitive biomolecular detection with a large dynamic range
Xiang Wu1, Maung Kyaw Khaing Oo2, Karthik Reddy3
11] Department of Biomedical Engineering, University of Michigan, 1101 Beal Avenue, Ann Arbor, Michigan 48109, USA [2] Key Laboratory for Micro and Nano Photonic Structures (Ministry of Education), Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China [3].
A novel optofluidic laser-based enzyme-linked immunosorbent assay (ELISA) improves biomolecular analysis. This laser-based ELISA uses laser onset time as a signal, achieving a 1 fg/mL detection limit for interleukin-6.
Area of Science:
- Biomolecular analysis
- Optofluidics
- Laser-based sensing
Background:
- Traditional enzyme-linked immunosorbent assay (ELISA) methods suffer from high background noise, limiting detection sensitivity and dynamic range.
- Issues like non-specific binding, material autofluorescence, and light leakage in conventional ELISA reduce analytical performance.
- There is a need for enhanced ELISA techniques with improved detection limits and broader dynamic ranges.
Purpose of the Study:
- To develop and validate an optofluidic laser-based enzyme-linked immunosorbent assay (ELISA) as an alternative sensing method.
- To utilize laser onset time as a sensitive signal for biomolecular detection, overcoming limitations of light intensity-based methods.
- To demonstrate the dual-mode detection capability and superior performance of the optofluidic laser-based ELISA.
Main Methods:
- Integration of the enzyme-linked immunosorbent assay (ELISA) process within a laser cavity.
- Utilizing laser onset time as the primary sensing signal, inversely proportional to analyte concentration.
- Characterization of optofluidic laser performance and dual-mode detection of interleukin-6 using commercial ELISA kits.
Main Results:
- The optofluidic laser-based ELISA demonstrated a significantly improved detection limit of 1 fg/mL (38 aM) for interleukin-6.
- The developed method achieved an impressive dynamic range of 6 orders of magnitude.
- Simultaneous detection using traditional and optofluidic laser-based ELISA confirmed the enhanced performance.
Conclusions:
- Optofluidic laser-based ELISA offers a highly sensitive and robust platform for biomolecular detection.
- This novel approach overcomes the limitations of traditional light intensity-based ELISA, providing superior analytical performance.
- The laser onset time signal in optofluidic systems presents a promising advancement in sensitive immunoassay development.
