A Droplet-Based Microfluidic Platform for Rapid Optical Detection of Bacteria: Proof-of-Concept for...

Area of Science:

• Microfluidics
• Optical Detection
• Radiopharmaceutical Quality Control

Background:

• Radiopharmaceuticals require rapid sterility testing due to short half-lives.
• Conventional culture methods are too slow for clinical radiopharmaceutical workflows.
• Existing methods pose challenges for timely quality assurance.

Purpose of the Study:

• To develop a proof-of-concept microfluidic platform for rapid sterility testing of radiopharmaceuticals.
• To enable optical detection of bacterial contamination using microdroplets.
• To address the time constraints of conventional sterility tests in radiopharmaceutical production.

Main Methods:

• Generation of monodisperse water-in-oil microdroplets.
• Optical interrogation of microdroplets using a fiber-based detection system.
• Analysis of bacterial suspensions (Staphylococcus aureus) via optical extinction.

Main Results:

• Demonstrated reliable detection of bacterial contamination.
• Achieved limits of detection of approximately 15 CFU/mL (aerobic) and 7.5 CFU/mL (anaerobic).
• Platform enables real-time, high-throughput analysis with reduced sample handling.

Conclusions:

• Microfluidic-based optical detection is feasible for rapid radiopharmaceutical sterility testing.
• The platform offers a significant time reduction compared to conventional methods.
• This validates a foundation for automated sterility testing in radiopharmaceutical production.