Reagent Storage In Microfluidic Cartridges: Technologies, Manufacturing Considerations, And POC Applications

Reagent storage can play a decisive role in the performance, reliability, and commercial scalability of point-of-care microfluidic diagnostics. Choosing a storage strategy early in development helps teams align assay requirements with manufacturing realities and avoid costly redesigns during scale-up.

This guide explores key reagent storage technologies for microfluidic cartridges, with insights from Stefan Leidheiser, Senior Customer Project Manager at thinXXS. It examines how storage decisions influence user experience, reagent stability, fluid management, shelf life, and production efficiency.

Liquid reagent options include traditional blister packs, integrated blister technology, and molded liquid storage tanks. The guide compares their operating principles, benefits, and manufacturing considerations, including material usage, filling processes, sealing requirements, reagent volumes, and automated production.

For assays requiring enhanced stability, dry reagent storage and lyophilization can extend shelf life and improve transportation robustness. However, integrating dried reagents directly into cartridges can introduce challenges during high-volume manufacturing.

The guide highlights reagent plug technology as a carrier-based approach that separates reagent preparation from cartridge production. Reagent plugs can be independently molded, loaded, dried or lyophilized, quality-controlled, and then automatically assembled into microfluidic cartridges. This approach can improve process control, manufacturing yields, scalability, and platform flexibility.

Reagent plugs can also be combined with lyophilized beads to support pellet containment, mechanical crushing, improved mixing, and reduced dead volume after reconstitution.

Whether developing an early proof of concept or preparing for commercial production, selecting a reagent storage strategy that supports both assay performance and manufacturing requirements can reduce development risk and accelerate the path from concept to scalable production.