Liquid Crystal Droplet-Embedded Biopolymer Hydrogel Sheets for Biosensor Applications

Area of Science:

• Biomaterials Science
• Chemical Sensing
• Nanotechnology

Background:

• Clinical diagnosis relies on accurate and accessible biosensing platforms.
• Existing methods for detecting bile acids can be complex and costly.
• There is a need for portable, low-cost, and label-free biosensors.

Purpose of the Study:

• To develop a novel biosensing platform for the real-time detection of bile acids.
• To create a portable and label-free sensing system using liquid crystal (LC) droplet-embedded chitosan (CHI) hydrogel films.
• To investigate the influence of bile acid chemical structures on sensor performance.

Main Methods:

• Forming LC droplet-embedded CHI hydrogel films via Ag(+) ion-triggered gelation of a CHI/surfactant complex-stabilized LC emulsion.
• Casting the emulsion onto substrates and cutting small sheets from the resulting hydrogel films.
• Utilizing the hydrogel sheets as a portable sensing platform for label-free bile acid detection.

Main Results:

• Successfully fabricated portable LC droplet-embedded CHI hydrogel films.
• Demonstrated the platform's capability for real-time, label-free detection of bile acids.
• Observed that sensor response time and detection limits are dependent on the chemical structures of the bile acids.

Conclusions:

• LC droplet-embedded CHI hydrogel films offer a promising portable and label-free biosensing platform.
• The developed sensor is suitable for detecting small volumes of bile acids in real-time.
• The sensor's performance is tunable based on bile acid chemical properties, enabling specific diagnostic applications.