Highly sensitive and selective odorant sensor using living cells expressing insect olfactory receptors

Area of Science:

• Biotechnology
• Chemical Sensing
• Environmental Monitoring

Background:

• Developing sensitive and selective chemical sensors is crucial for environmental and physical condition monitoring.
• Existing sensors often struggle with distinguishing closely related chemical compounds or require complex integration.
• Living cells offer unique biological recognition capabilities for novel sensing applications.

Purpose of the Study:

• To develop a highly sensitive and selective chemical sensor utilizing living cells (Xenopus laevis oocytes) within a portable fluidic device.
• To demonstrate the sensor's capability to detect chemicals at parts per billion levels and differentiate between isomers and functional groups.
• To establish a stable, reproducible, and easily integrated sensing system for potential real-world applications.

Main Methods:

• Construction of a portable fluidic device housing Xenopus laevis oocytes as the sensing element.
• Development of a semiautomatic method for cell installation to ensure stable and reproducible sensor performance.
• Testing the sensor's sensitivity, selectivity, and multi-target detection capabilities for various chemicals, including those with slight structural differences.

Main Results:

• Achieved high sensitivity (parts per billion) and selectivity, distinguishing chemicals with minor differences in double bond isomerism or functional groups (-OH, -CHO, -C(=O)-).
• Demonstrated stable and reproducible odorant sensing through a semiautomatic cell installation method.
• Confirmed the sensor's ability to detect multiple chemical targets simultaneously and integrate with robotic systems without noise reduction, highlighting its compact and replaceable design.

Conclusions:

• The developed cell-based chemical sensor is highly sensitive, selective, and robust.
• The portable fluidic device offers a compact and user-friendly platform for advanced chemical detection.
• This technology holds significant potential for integration into portable systems for real-time environmental and physical condition monitoring.