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Dual-color fluorescence cross-correlation spectroscopy on a planar optofluidic chip
1School of Engineering, University of California Santa Cruz, Santa Cruz, CA 95064, USA.
Lab on a Chip
|February 23, 2011
Summary
This study introduces dual-color fluorescence cross-correlation spectroscopy (FCCS) on an integrated optofluidic chip, simplifying complex alignment. The lab-on-chip device enables precise detection of molecular interactions and DNA denaturation.
Area of Science:
- Analytical Chemistry
- Biophysics
- Optics
Background:
- Fluorescence cross-correlation spectroscopy (FCCS) is a sensitive technique for studying molecular interactions.
- Traditional FCCS setups require complex optical alignment.
- Integrated optofluidic platforms offer potential for simplified bioanalytical measurements.
Purpose of the Study:
- To demonstrate the first implementation of dual-color FCCS on a planar, integrated optofluidic chip.
- To showcase the chip's capability for automated beam alignment and simplified FCCS measurements.
- To validate the optofluidic FCCS platform for bioanalytical applications like particle colocalization and binding dynamics.
Main Methods:
- Development of a planar optofluidic chip utilizing liquid-core waveguides for simultaneous light and liquid guidance.
- Implementation of dual-color excitation beams delivered through integrated waveguides for automatic alignment.
- Application of FCCS for particle colocalization studies using fluorescently labeled nanobeads.
- Integration of FCCS with fluorescence resonance energy transfer (FRET) to monitor DNA denaturation.
Main Results:
- Successful demonstration of dual-color FCCS on the optofluidic lab-on-chip device.
- Accurate colocalization detection and discrimination of single-color and double-color fluorescent nanobeads.
- Detection of double-stranded DNA denaturation at nanomolar concentrations using FCCS-FRET.
Conclusions:
- The integrated optofluidic chip enables simplified and automated dual-color FCCS measurements.
- This platform is suitable for sensitive bioanalytical applications, including molecular binding and dynamics.
- The developed lab-on-chip device represents a significant advancement for high-throughput molecular interaction analysis.
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