Reagent Filming for Universal Point-of-Care Diagnostics

Area of Science:

• Biomaterials Science
• Diagnostic Assay Development
• Point-of-Care Diagnostics

Background:

• Diagnostic assay simplification and reagent stability are critical challenges, especially for resource-limited settings lacking infrastructure.
• Translating high-quality diagnostics to developing countries is hindered by the need for trained personnel, advanced equipment, and cold-chain logistics.

Purpose of the Study:

• To develop a novel reagent film technology for simplifying diagnostic assays.
• To enhance the stability of diagnostic reagents without relying on cold-chain storage.
• To demonstrate the practicability and universal applicability of this technology in diverse diagnostic assays.

Main Methods:

• Encapsulation of premeasured and premixed reagents within a polyvinyl-alcohol-based water-soluble film.
• Utilizing a simple and scalable cast-drying process to produce the reagent film.
• Testing the film-based reagent technology in an enzymatic glucose assay, a cardiac troponin immunoassay, and a viral RNA molecular assay.

Main Results:

• The reagent film provides a stable matrix that restricts molecular mobility and forms hydrogen bonds, preserving reagent integrity.
• Film-based assays demonstrated excellent analytical and diagnostic performance across enzymatic, immunoassay, and molecular test formats.
• Reagents stored in the film exhibited stable long-term preservation at elevated temperatures (25°C or 37°C) for six months.

Conclusions:

• The developed reagent film technology offers a robust and simple solution for diagnostic assay operation and reagent stabilization.
• This innovation is clinically ready and significantly advances the development and distribution of affordable, high-quality diagnostics for resource-limited regions.
• The technology overcomes cold-chain dependency, enhancing diagnostic accessibility globally.