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Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
Published on: March 20, 2015
A new aptameric biosensor for cocaine based on surface-enhanced Raman scattering spectroscopy
Jiwei Chen1, Jianhui Jiang, Xing Gao
1State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 31, 2008
Summary
This study presents a new cocaine sensor using surface-enhanced Raman scattering (SERS) spectroscopy. The reagentless aptameric sensor offers a "signal-on" approach for sensitive detection and easy regeneration.
Area of Science:
- Analytical Chemistry
- Biotechnology
- Spectroscopy
Background:
- Aptameric sensors offer high specificity for target detection.
- Surface-enhanced Raman scattering (SERS) provides sensitive spectroscopic analysis.
- Developing reagentless sensors simplifies detection methods.
Purpose of the Study:
- To demonstrate a novel reagentless aptameric sensor for cocaine detection.
- To utilize surface-enhanced Raman scattering (SERS) with a "signal-on" architecture.
- To optimize sensor fabrication for enhanced response performance.
Main Methods:
- Fabrication of a SERS substrate using a silver colloid film.
- Immobilization of a tetramethylrhodamine (TMR)-labeled DNA aptamer via mixed self-assembly.
- Utilizing cocaine-templated aptamer conformational changes to enhance SERS signals.
Main Results:
- Achieved sensitive detection of cocaine at concentrations as low as 1 muM.
- Demonstrated a "signal-on" response based on aptamer conformational changes.
- The sensor exhibited favorable performance compared to electrochemical and fluorescence methods.
Conclusions:
- The developed SERS-based aptameric sensor is a viable tool for cocaine detection.
- The "signal-on" architecture and optimized immobilization enhance sensor performance.
- This approach holds promise for future biochemical and biomedical sensing applications.
