Related Experiment Videos
A microbead array chemical sensor using capillary-based sample introduction: toward the development of an "electronic
Young-Soo Sohn1, Adrian Goodey, Eric V Anslyn
1The University of Texas at Austin, Department of Electrical and Computer Engineering, Austin, TX 78712, USA. sohn.ys@mail.utexas.edu
Biosensors & Bioelectronics
|July 19, 2005
Summary
A novel micromachined fluidic structure enables liquid sample introduction into chip-based sensor arrays. This compact system utilizes capillary force for passive fluid delivery, proving useful for micro-total-analysis systems and biomedical applications.
Area of Science:
- Microfluidics
- Sensor Technology
- Biomedical Engineering
Background:
- Chip-based sensor arrays require efficient liquid sample introduction.
- Existing methods can be complex and bulky.
- Optical transduction offers sensitive detection capabilities.
Purpose of the Study:
- To develop a micromachined fluidic structure for sample introduction into polymeric microbead sensor arrays.
- To implement a passive, capillary-driven fluid delivery system.
- To validate the system's performance for near-real-time analysis.
Main Methods:
- Fabrication of a micromachined fluidic structure with storage cavities and a glass cover.
- Covalent attachment of receptors and indicator molecules to polymeric microbeads.
- Optical data acquisition using a charged-coupled device (CCD) for spectral analysis.
- Characterization of capillary flow and microbead response to liquid samples.
Main Results:
- Successful integration of micromachined cavities and fluidic channels.
- Demonstration of passive fluid introduction via capillary force.
- Near-real-time spectral data acquisition from individual microbeads.
- Characterized response of alizarin complexone-functionalized microbeads.
Conclusions:
- The developed micromachined fluidic structure facilitates compact and efficient liquid sample analysis.
- The passive capillary-driven system is suitable for micro-total-analysis systems (µ-TAS).
- The technology shows promise for various biomedical applications requiring rapid sample analysis.