Single-Layered Microfluidic Network-Based Combinatorial Dilution for Standard Simplex Lattice Design.

Area of Science:

• Microfluidics
• Chemical Engineering
• Biotechnology

Background:

• Generating precise sample combinations is crucial for high-throughput screening and assays.
• Traditional methods can be time-consuming and require large sample volumes.
• Microfluidic devices offer a potential solution for miniaturized and efficient sample handling.

Purpose of the Study:

• To develop a straightforward strategy for generating multiple sample combinations using a single-layer microfluidic network.
• To evaluate the performance of different microfluidic device designs through computational simulation and experimental validation.
• To assess the suitability of two liquid handling methods for high-throughput applications.

Main Methods:

• Utilized an experimental simplex lattice design to define 15 sample combinations.
• Employed computational fluid dynamics (CFD-ACE+) simulations to compare plain and groove structural microfluidic devices.
• Fabricated polydimethylsiloxane (PDMS) devices using soft lithography and validated mixing performance with fluorescent dye.

Main Results:

• Simulated output concentrations closely matched desired values with <1% absolute error.
• Experimental results showed good mixing performance for 15 combinations with <4% absolute error.
• Both bottom-up and top-down liquid handling methods were successfully implemented using structured groove sets.

Conclusions:

• The developed single-layer microfluidic network provides an efficient and accurate method for generating sample combinations.
• The groove structural design enhances mixing performance compared to plain structures.
• The integrated liquid handling methods support high-throughput screening and assay applications.