Extracting More health Information from Exhaled Breath

Amazing stuff!

"... The first thing a smart mask does to collect data is cool exhaled breath using a hydrogel—a water-based substance that can retain water while maintaining its structure—and capture the resulting liquid, called exhaled breath condensate (EBC). Once EBC is collected, sensors analyze the samples for biomarkers of health, such as metabolites, pathogens, and inflammatory indicators, and transmit the data wirelessly to a personal phone, tablet, or computer. But in previous versions of the mask, the hydrogel dried up after a few hours, making continuous monitoring over time difficult. ..."

From the abstract:

"Exhaled breath condensate (EBC) offers a non-invasive window into respiratory and systemic metabolism, yet wearable EBC systems are constrained by unstable moisture harvesting, short sensor lifetimes in humidity and battery dependence.

Here we present EBClite, a battery-free smart mask for multiday EBC biomarker monitoring, using lactate as a model analyte. The platform integrates a regenerable antidrying porous hydrogel that achieves sustained and reactivatable breath condensation over several days, extending operational lifetime while reducing material cost.

EBClite further incorporates a long-term stable electrochemical lactate sensor and an ultrathin quasi-two-dimensional perovskite solar cell with a power-to-weight ratio of 10 W g−1 and a power conversion efficiency exceeding 30% under ambient indoor illumination, enabling autonomous operation across diverse lighting conditions. Human studies demonstrate strong correlations between EBC and blood lactate levels during exercise and carbohydrate intake, enabling real-time tracking of metabolic fluctuations. EBClite provides a sustainable, user-friendly platform for continuous respiratory and metabolic monitoring."

Extracting More Information from Exhaled Breath - www.caltech.edu "Exhaled breath can provide a treasure trove of health information, offering a noninvasive window to both respiratory microenvironments and systemic physiological states. But collecting such data is a challenge."

A battery-free smart mask for long-term exhaled breath biochemical sensing (no public access)

Illustration of the origin and transport pathway of metabolites (for example, lactate) from blood to the airway surface liquid, where they diffuse across the epithelium and are incorporated into exhaled vapor before condensing as non-volatile metabolites in exhaled breath condensate.

The EBClite smart mask can analyze the chemicals in one's breath in real time.