Multidimensional Digital Bioassay Platform Based on an Air-Sealed Femtoliter Reactor Array Device.

Area of Science:

• Single-molecule biology
• Digital bioassay technology

Background:

• Digital bioassays analyze individual molecules but struggle with multi-conditional and multi-parametric assays.
• Current digital bioassays lack repeatable solution-exchange systems, limiting in-depth analyte understanding.

Purpose of the Study:

• To develop a novel digital bioassay platform enabling easy and repeatable solution exchanges for single-molecule analysis.
• To overcome limitations of conventional digital bioassays for complex biological studies.

Main Methods:

• Developed a multidimensional (MD) digital bioassay platform using arrayed femtoliter reactors.
• Immobilized single analytes and sealed reactors with airflow for stable, cross-talk-free solution exchange.
• Successfully performed over 30 rounds of solution exchanges within 2 hours.

Main Results:

• Demonstrated quantitative determination of inhibitor sensitivities for single influenza A virus particles and alkaline phosphatase (ALP) molecules.
• Successfully distinguished ALPs from two different origins using single-molecule multi-parametric assays.
• Achieved in-depth analysis of biological entities with unprecedented resolution.

Conclusions:

• MD digital bioassay is a versatile platform for advanced single-molecule analysis.
• Enables complex assays previously impossible with conventional digital bioassays.
• Offers a powerful tool for deeper insights into biological phenomena at the single-molecule level.