digitalMALDI: A Single-Particle-Based Mass Spectrometric Detection System for Biomolecules.

Area of Science:

• Analytical Chemistry
• Biotechnology
• Environmental Science

Background:

• Current molecular assays for aerosol particles are slow, costly, and lack multiplexing capabilities, hindering real-time monitoring.
• Real-time characterization of biomolecule-containing aerosols is crucial for diagnosing respiratory conditions and environmental surveillance.

Purpose of the Study:

• To develop a novel laser-based mass spectrometry system for near real-time, single-particle characterization of aerosols.
• To overcome limitations of existing molecular assay technologies for rapid biomolecule detection.

Main Methods:

• Development of digitalMALDI, a laser-based mass spectrometry system for direct aerosol sampling.
• Utilizing intact insulin protein as a model analyte for system validation.

Main Results:

• The digitalMALDI system demonstrated the capability to detect 1 pg of insulin protein in single aerosol particles.
• The platform operates in near real-time, bypassing extensive sample preparation steps.

Conclusions:

• digitalMALDI offers a transformative approach for the rapid characterization of biomolecule-containing aerosols.
• The system holds significant potential for applications in disease diagnosis, environmental monitoring, and biosecurity.