Skin-Interfaced Bifluidic Paper-Based Device for Quantitative Sweat Analysis

Area of Science:

• Biomedical Engineering
• Analytical Chemistry
• Wearable Technology

Background:

• Unpredictable sweat production complicates accurate biomarker analysis using traditional methods.
• Existing skin-interfaced colorimetric devices struggle with variable sweat rates, leading to inaccuracies.
• Real-time, reliable sweat analysis is crucial for health monitoring and disease screening.

Purpose of the Study:

• To develop a skin-interfaced bifluidic device for simultaneous real-time sweat rate and biomarker quantification.
• To address the limitations of current colorimetric sweat sensors susceptible to variable sweat volumes.
• To enable accurate sweat analysis for hydration and glucose levels, even during unpredictable physiological conditions.

Main Methods:

• Introduction of a novel colorimetric bifluidic sweat device with two synchronous channels.
• Implementation of a bifluidic-distance metric approach to measure sweat rate and quantify sweat volume.
• Utilizing a closed channel design to minimize evaporation and external contamination.

Main Results:

• Demonstrated proof-of-concept for analyzing sweat chloride and sweat glucose.
• Accurate quantification of sweat rate and biomarker concentrations based on collected sweat volume.
• The device showed feasibility for evaluating hydration status and glucose levels in real-time.

Conclusions:

• The developed bifluidic device offers a low-cost, highly accurate solution for sweat analysis.
• This technology facilitates clinical applications and disease screening in resource-limited environments.
• The adaptable platform can be extended for the analysis of various other biomarkers.