Large-Scale Dried Reagent Reconstitution and Diffusion Control Using Microfluidic Self-Coalescence Modules

The positioning and manipulation of large numbers of reagents in small aliquots are paramount to many fields in chemistry and the life sciences, such as combinatorial screening, enzyme activity assays, and point-of-care testing. Here, a capillary microfluidic architecture based on self-coalescence modules capable of storing thousands of dried reagent spots per square centimeter is reported, which can all be reconstituted independently without dispersion using a single pipetting step and <= 5 mu L of a solution. A simple diffusion-based mathematical model is also provided to guide the spotting of reagents in this microfluidic architecture at the experimental design stage to enable either compartmentalization, mixing, or the generation of complex multi-reagent chemical patterns. Results demonstrate the formation of chemical patterns with high accuracy and versatility, and simple methods for integrating reagents and imaging the resulting chemical patterns.

Automated summary

This study reports a capillary microfluidic architecture based on self-coalescence modules, which can store a large number of reagents in small aliquots and reconstitute them independently using a simple pipetting step. A mathematical model is provided to guide the spotting of reagents and enable the generation of complex multi-reagent chemical patterns. The results demonstrate the accurate and versatile formation of chemical patterns, as well as simple methods for integrating reagents and imaging the resulting patterns.