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A Microfluidic Chip for the Versatile Chemical Analysis of Single Cells
Published on: October 15, 2013
Towards an integrated microfluidic device for spaceflight clinical diagnostics Microchip-based solid-phase extraction
Daniel J Marchiarullo1, Ji Y Lim, Zalman Vaksman
1Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA.
Journal of Chromatography. A
|June 17, 2008
Summary
A novel microchip method efficiently extracts small molecules from saliva, aiding oxidative stress detection. This technique offers high recovery and concentration, paving the way for integrated biomarker analysis.
Area of Science:
- Biomedical Engineering
- Analytical Chemistry
- Biochemistry
Background:
- Oxidative stress is implicated in various diseases.
- Salivary metabolites, such as dihydroxybenzoic acids (DHBAs), are potential biomarkers for oxidative stress.
- Accurate and efficient analysis of these biomarkers is crucial for early disease detection.
Purpose of the Study:
- To develop a microchip-based solid-phase extraction (SPE) method for the efficient extraction and preconcentration of small molecules from biological fluids.
- To validate the method for analyzing 2,3-dihydroxybenzoic acid (DHBA) and 2,5-DHBA in human saliva.
- To assess the potential of this method for future integrated microdevices in spaceflight biomarker analysis.
Main Methods:
- Development of a microchip SPE device packed with a commercially available copolymer.
- Extraction and preconcentration of DHBAs from spiked saliva samples.
- Direct analysis of the eluent using capillary electrophoresis (CE).
Main Results:
- High recovery rates for both 2,3-DHBA and 2,5-DHBA (>90+/-15%) from spiked saliva.
- Achieved an 80-fold concentration enhancement of the target metabolites.
- Demonstrated good resolution of the two DHBA isomers using CE, enabling accurate quantification.
- Confirmed the feasibility of the microchip-based approach for small molecule biomarker analysis.
Conclusions:
- The developed microchip-based SPE method provides a highly efficient and sensitive approach for analyzing salivary DHBAs.
- This technique offers significant advantages in terms of sample volume, processing time, and preconcentration factor.
- The study highlights the potential of integrated microdevices for on-site and real-time biomarker monitoring, particularly in challenging environments like spaceflight.
