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A Gradient-generating Microfluidic Device for Cell Biology
Published on: August 30, 2007
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Complete experimental and theoretical characterization of nonlinear concentration gradient generator microfluidic
Paulo Henrique Maciel Buzzetti1,2, Maiara Mitiko Taniguchi1, Nayara de Souza Mendes1
1Materials Chemistry and Sensors Laboratories (LMSEN), Department of Chemistry, State University of Maringá, Colombo 5790, Maringá, PR, 87020-900, Brazil.
Mikrochimica Acta
|December 6, 2021
Summary
This study introduces a reusable microfluidic device for generating nonlinear concentration gradients, ideal for calibrating analytical and bioanalytical systems. The device demonstrates high reproducibility and accuracy when coupled with surface plasmon resonance (SPR) biosensors for biomolecule quantification.
Area of Science:
- Microfluidics
- Analytical Chemistry
- Biotechnology
Background:
- Microfluidic devices are crucial for automated calibration in analytical and bioanalytical systems.
- Reusable microfluidic concentration gradient generators are needed for diverse applications.
- Mathematical characterization of reusable devices is essential for broad utility.
Purpose of the Study:
- To develop a reusable microfluidic device for generating nonlinear concentration gradients.
- To mathematically and statistically characterize the device for analytical and bioanalytical applications.
- To validate the device's performance using dyes, biomolecules, and a surface plasmon resonance (SPR) biosensor.
Main Methods:
- A three-step serial dilution microfluidic device was designed and fabricated.
- The device's gradient generation was mathematically modeled and statistically analyzed.
- Reproducibility was tested with various dyes and bovine serum albumin (BSA).
- Computational fluid dynamics (CFD) simulations were used for validation.
- The device was coupled to an SPR biosensor for quantification of glucose solutions and BSA samples.
Main Results:
- The microfluidic device successfully generated nonlinear concentration gradients for dyes and biomolecules.
- Experimental tests confirmed high reproducibility and statistical accuracy (95% confidence interval for BSA).
- Experimental data aligned well with CFD simulation results.
- The SPR biosensor achieved a sensitivity of 358.7 nm RIU⁻¹.
- The device accurately quantified a pseudo-unknown BSA sample (138 µg mL⁻¹ vs. 160 µg mL⁻¹), validated by fluorescence (154.8 ± 16.6 µg mL⁻¹).
Conclusions:
- A novel, reusable microfluidic concentration gradient generator was successfully developed.
- The device offers a reproducible and mathematically characterized platform for analytical and bioanalytical applications.
- Coupling with SPR biosensing enables sensitive and accurate quantification of biomolecules.
