Asthma patient monitoring

California based BioMEMS company Aspieron markets a MEMS-based sensor system measuring nitric oxide in breath aimed at asthma patients.
The system called "Insight™ eNO System" consists of a sol-gel deposited porous glass matrix permeable to nitric oxide which contains specific protein molecules reacting with nitric oxide. This porous matrix allows for a certain portion of light to pass through it and the absorption rate being propotional to the concentration of nitric oxide in the matrix.
The reported measurement sensitivity for these sensors is in the area of several parts per billion (ppb) and very specific to nitric oxide due to the proteins used.
[Aspieron]