An Optical Biosensing Strategy Based on Selective Light Absorption and Wavelength Filtering from Chromogenic Reaction

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Optical Biosensing

Background:

• Traditional biosensing methods for disease diagnosis often face limitations in terms of time and space.
• Colorimetric optical biosensors typically require complex and expensive optical equipment for signal analysis.

Purpose of the Study:

• To develop a new signal-transducing strategy for colorimetric optical biosensors.
• To translate color intensity signals into easily countable signals for naked-eye detection.
• To simplify disease diagnosis by overcoming time and space constraints.

Main Methods:

• A novel optical signaling transducer was constructed using a computer monitor's liquid crystal display (LCD) panel and a smartphone.
• The LCD panel acted as a light source and signal guide generator, while the smartphone served as an optical receiver.
• A biosensing channel with a target-specific bienzymatic chromogenic reaction generated a blue output, functioning as a color-filtering layer.

Main Results:

• The system translated color intensity signals into visually countable polygons displayed on the smartphone camera.
• Changes in the number of observed polygons correlated with the concentration of the target analyte.
• Accurate measurement of glucose concentration (0-10 mM) was demonstrated without complex instrumentation.

Conclusions:

• The developed signal transduction strategy offers a simple, cost-effective, and efficient method for biosensing.
• This approach significantly enhances the accessibility of disease diagnosis by eliminating the need for specialized optical equipment.
• The technology holds promise for point-of-care diagnostics and resource-limited settings.