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A Microfluidic-based Electrochemical Biochip for Label-free DNA Hybridization Analysis
Published on: September 10, 2014
A dual detector capillary waveguide biosensor for detection and quantification of hybridized target
Harbans S Dhadwal1, Bhaskar Mukherjee, Paul Kemp
1Department of Electrical and Computer Engineering, Stony Brook University, Stony Brook, NY 11794, United States. dhadwal@ece.sunysb.edu
Analytica Chimica Acta
|August 19, 2007
Summary
A new method enhances analytical instrument sensitivity by measuring fluorescent intensity alongside Rayleigh scattered light. This technique improves biosensor performance, enabling precise detection and quantification of target molecules.
Area of Science:
- Analytical Chemistry
- Biotechnology
- Optical Sensing
Background:
- Improving the sensitivity of analytical instruments is crucial for accurate detection.
- Fluorescence intensity measurements are widely used but can be affected by experimental parameters.
- Existing methods often lack the sensitivity required for precise quantification of low-abundance analytes.
Purpose of the Study:
- To develop a novel technique for enhancing the sensitivity of fluorescence-based analytical instruments.
- To normalize fluorescence data, making it independent of experimental variations.
- To integrate this technique into a biosensor for improved performance.
Main Methods:
- Implementing a dual-detection system measuring both fluorescence intensity and Rayleigh scattered light.
- Utilizing a second photodetector to independently measure the Rayleigh scattered component.
- Normalizing the fluorescence intensity data using the Rayleigh scattered intensity.
- Incorporating the technique into an automated capillary waveguide biosensor.
Main Results:
- Achieved normalized data independent of various experimental parameters.
- Improved the sensitivity of the automated capillary waveguide biosensor by a factor of three.
- Demonstrated the capability for both detection and quantification of hybridized target molecules.
Conclusions:
- The novel technique significantly enhances analytical instrument sensitivity.
- Independent measurement of Rayleigh scattering provides robust, normalized data.
- The method is effective for precise quantification and detection in biosensing applications.
