A Fully Printable and Integrated System with Long-Term Stability for Versatile and Multimodal Perspiration Tracking

Area of Science:

• Biomedical Engineering
• Wearable Technology
• Analytical Chemistry

Background:

• Noninvasive sweat sensing offers potential for personalized healthcare but faces challenges due to variable perspiration rates affecting sweat collection and sensor accuracy.
• Existing methods struggle with consistent and reliable monitoring of both sweat biomarkers and flow rates simultaneously.
• Developing integrated, stable, and versatile sensing platforms is crucial for advancing wearable health monitoring.

Purpose of the Study:

• To develop a fully printable, integrated sensing patch for real-time, wireless monitoring of sweat biomarker levels and perspiration rates.
• To address the challenges posed by variable perspiration rates in noninvasive physiological monitoring.
• To create a versatile and stable platform for comprehensive health tracking via sweat analysis.

Main Methods:

• A fully printable strategy was employed to create integrated patches featuring printable calcium sensors with modified ion-selective membranes.
• Microfluidic channels were designed in versatile configurations for efficient sweat collection and rate monitoring.
• The sensing platform was characterized for its linear range, long-term stability, and minimum detectable sweat rate.

Main Results:

• Printable calcium sensors demonstrated an ultrawide linear range (0.1-100 mM) and excellent long-term stability (drift < 0.083 mV/h for 40 h).
• Microfluidic channels achieved a minimum sweat rate detection of 0.5 μL/min and a large storage capacity of 200 μL.
• The fully printable sensing platform exhibited high compatibility for sensor integration, enabling versatile perspiration tracking.

Conclusions:

• The developed fully printable sensing platform offers a stable and versatile solution for integrated wireless sweat sensing.
• This technology facilitates accurate monitoring of sweat biomarkers and perspiration rates, advancing personalized healthcare and fitness management.
• The high compatibility and versatility of the platform support comprehensive health monitoring through noninvasive sweat analysis.