Air-Bubble-Insensitive Microfluidic Lactate Biosensor for Continuous Monitoring of Lactate in Sweat

Area of Science:

• Biomedical Engineering
• Wearable Technology
• Analytical Chemistry

Background:

• Lactate monitoring in sweat is crucial for assessing physiological status during exercise and in medical conditions.
• Existing sweat lactate sensors face challenges with air bubble interference, hindering continuous and accurate measurements.
• Developing a robust sensor system is essential for non-invasive, real-time lactate analysis.

Purpose of the Study:

• To engineer a microchannel-based lactate sensor that mitigates air bubble interference for reliable sweat analysis.
• To evaluate the sensor's capability for continuous lactate monitoring in sweat during physical activity.
• To establish the correlation between sweat lactate levels measured by the sensor and blood lactate concentrations.

Main Methods:

• Design and fabrication of a lactate sensor incorporating a specialized microchannel to trap air bubbles.
• Integration of the microchannel for continuous sweat supply and drainage to the sensor's electrodes.
• In-situ evaluation of the sensor's performance during exercise, comparing sweat lactate readings with blood lactate levels.

Main Results:

• The developed microchannel effectively prevented air bubbles from interfering with lactate measurements.
• The sensor demonstrated accurate lactate concentration correlation within the range of 1 to 50 mM.
• A significant correlation was observed between sweat lactate levels and blood lactate concentrations.

Conclusions:

• The microchannel lactate sensor successfully overcomes air bubble interference, enabling continuous and accurate sweat lactate monitoring.
• The wearable sensor shows promise for long-term application in sports and medicine for real-time physiological assessment.
• This technology facilitates non-invasive monitoring of lactate, offering valuable insights into metabolic states.