Integrated Wearable Flexible Hydrogel Patch Sensing System for the Detection of Physiological Markers

Area of Science:

• Biomedical Engineering
• Materials Science
• Analytical Chemistry

Background:

• Conventional wearable sensors lack integration, leading to complexity, higher costs, and failure risks.
• Hydrogel substrates offer biocompatibility, flexibility, and encapsulation, ideal for integrated wearable systems.
• Developing a fully integrated wearable sensor is crucial for improved performance, comfort, and manufacturability.

Purpose of the Study:

• To design and develop a highly integrated wearable flexible sensing system.
• To utilize agarose hydrogel as a substrate for encapsulating enzymes and signal processing components.
• To enable straightforward, visual detection of physiological markers in sweat.

Main Methods:

• An integrated system was fabricated using agarose hydrogel to encapsulate glucose oxidase (GOx), lactate oxidase, and ethanol oxidase.
• Silver nanowires-polydopamine (Ag NWs-PB) served as the signal processing module, and a TMB probe as the signal output.
• A polydimethylsiloxane-silicon dioxide patch was used for sweat collection to detect glucose, lactate, and ethanol.

Main Results:

• The system demonstrated visual detection of glucose in sweat within 3.5 minutes.
• It operated within a linear range of 0.02 to 5.00 mmol/L for glucose detection.
• A limit of detection of 0.011 mmol/L was achieved for glucose.

Conclusions:

• The developed integrated wearable hydrogel sensor offers a portable and efficient solution for physiological marker detection.
• This approach simplifies the detection process and presents a feasible method for real-time health monitoring.
• The study highlights the potential of hydrogel-based systems for advanced wearable diagnostics.