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High-Performance Suspension Bead Sensor Based on Optical Tweezers and Immuno-Rolling Circle Amplification.
Min Jiang1, Zecheng Wang1, Chenchen Zhang1
1State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, No 163, Xianlin Avenue, Nanjing 210023, PR China.
Analytical Chemistry
|August 7, 2024
Summary
Researchers developed optical tweezer-assisted immuno-rolling circle amplification (immuno-RCA) for sensitive protein detection. This novel bioassay platform significantly enhances sensitivity and accuracy for analyzing biomarkers like prostate-specific antigen.
Area of Science:
- Biophysics
- Biotechnology
- Analytical Chemistry
Background:
- Optical tweezers offer unique advantages for bioassays, especially with suspension beads, enabling high-quality imaging and stable signals.
- Current optical tweezer-assisted bead analysis methods require further development for enhanced performance.
- Protein detection assays need improved sensitivity, specificity, and reproducibility.
Purpose of the Study:
- To develop a novel optical tweezer-assisted immuno-rolling circle amplification (immuno-RCA) strategy for sensitive protein detection on beads.
- To establish an immunosandwich structure on beads for specific antigen capture.
- To demonstrate the potential of this platform for clinical serology research.
Main Methods:
- Developed an optical tweezer-assisted immuno-RCA assay using antibody-antigen interactions to form an immunosandwich on beads.
- Converted protein-nucleic acid signals via covalent coupling of antibodies and oligonucleotides to initiate RCA.
- Utilized optical tweezers to trap individual beads and acquire high-quality signals from their Brownian motion.
Main Results:
- Achieved a 587-fold increase in sensitivity compared to conventional immunoassays on beads.
- Established a limit of detection of 4.29 pg/mL (0.13 pM) for prostate-specific antigen.
- Demonstrated excellent specificity, stability, and reproducibility of the developed assay.
Conclusions:
- The developed optical tweezer-assisted beads imaging strategy offers a new method for protein target detection.
- This platform shows significant potential for application in clinical serology research.
- Expands the application of optical tweezers in the field of bioassays.
