A novel fluorescence-based array biosensor: principle and application to DNA hybridization assays.

Area of Science:

• Analytical Chemistry
• Biotechnology
• Environmental Science

Background:

• Demand for automated, portable, and low-maintenance systems for continuous environmental monitoring.
• Existing biosensors often lack simplicity, robustness, and ease of maintenance for field applications.

Purpose of the Study:

• Develop a novel fluorescence-based array biosensor for field applications, focusing on environmental monitoring.
• Enable automated, portable, and easy-to-maintain systems for continuous flow monitoring of surface reactions.
• Address limitations of current biosensor technologies through enhanced optical methods.

Main Methods:

• Utilized a fluorescence-based array biosensor built on a conventional microscope slide acting as transducer and sensor.
• Employed total internal reflection for fluorescence guidance to a directly interfaced detector.
• Implemented successive optical interrogation of sensor array regions with synchronized fluorescent emission detection.
• Performed DNA hybridization assays to evaluate performance.

Main Results:

• Demonstrated continuous flow operation for tens of hours with stability and slide-to-slide reproducibility below 3.7%.
• Achieved a limit of detection of 16 fmol/µm² in DNA hybridization assays.
• Successfully predicted reaction kinetics and monitored surface reactions in real-time.

Conclusions:

• The developed biosensor is suitable for field applications like environmental monitoring due to its simplicity, robustness, and ease of maintenance.
• The system enables real-time monitoring of surface reactions and kinetic analysis without complex mechanical scanning or imaging.
• Offers a significant advancement over existing technologies for continuous flow surface reaction analysis.