Related Experiment Videos
Collection Method of SERS Active Nanoparticles for Sensitive and Precise Measurements
Javier T Garza1, Gerard L Cote1,2
1Department of Biomedical Engineering, Texas A&M University, College Station , Texas 77843, United States.
Analytical Chemistry
|December 9, 2017
Summary
A new device concentrates surface-enhanced Raman spectroscopy (SERS) nanoprobes for highly sensitive measurements. This innovation improves biosensor precision and detection limits for applications like cardiac Troponin I detection.
Area of Science:
- Nanotechnology
- Analytical Chemistry
- Biomedical Engineering
Background:
- Surface-enhanced Raman spectroscopy (SERS) biosensors require efficient nanoparticle collection for sensitive detection.
- Current solution-based methods limit sensitivity by analyzing only a fraction of available nanoprobes.
Purpose of the Study:
- To design, build, and test a novel collection device for SERS nanoprobes.
- To achieve highly sensitive (femtomolar) and repeatable measurements using SERS nanoprobes.
- To demonstrate the device's utility in a clinically relevant assay.
Main Methods:
- Synthesis and functionalization of silica nanoprobes with aggregated silver nanoparticles and Raman reporters.
- Development of a novel collection device to concentrate nanoprobes.
- Assessment of the collection device using varying nanoprobe concentrations to determine limit of detection and precision.
- Application of the nanoprobe and device in a competitive binding assay for cardiac Troponin I (cTnI).
Main Results:
- The collection device consistently concentrates nanoprobes, enabling femtomolar sensitivity and high repeatability.
- Measurements showed less than 10% coefficient of variation (CV) for nanoprobe concentrations from 27.4 fM to 1.7 pM.
- The assay successfully detected cardiac Troponin I across concentrations ranging from 0 to 250 ng/mL.
Conclusions:
- The developed collection device significantly enhances SERS biosensor sensitivity and precision.
- This approach overcomes limitations of solution-based measurements, improving nanoprobe utilization.
- The system demonstrates potential for sensitive and reliable detection of biomarkers like cTnI.