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Screen-printed biochemical sensors for detection of ammonia levels in sweat - Towards integration with vital parameter monitoring sports gear

 
: Oertel, S.; Jank, M.P.M.; Frey, L.; Hofmann, C.; Lang, N.; Struck, M.

Gilbert, J. ; Institute for Systems and Technologies of Information, Control and Communication -INSTICC-, Setubal:
BIOSTEC 2016, 9th International Joint Conference on Biomedical Engineering Systems and Technologies. Proceedings. Vol.4: BIOSIGNALS : Rome, Italy, February 21-23, 2016
SciTePress, 2016
ISBN: 978-989-758-170-0
pp.160-165
International Joint Conference on Biomedical Engineering Systems and Technologies (BIOSTEC) <9, 2016, Rome>
International Conference on Bio-Inspired Systems and Signal Processing (BIOSIGNALS) <9, 2016, Rome>
English
Conference Paper
Fraunhofer IIS ()

Abstract
The fabrication of fully screen-printed biochemical sensors employing planar integrated solid state electrodes is described. The sensors are developed to fit wearable devices and target the monitoring of ammonia respectively ammonium levels in sweat. Increased ammonium levels in sweat correlate to physical overstrain of muscles, indicated by the breakdown of proteins in muscle cells. The sensor on flexible foil uses an ion-selective working electrode and a reference electrode for potentiometric measurements of the electromotoric force, EMF. For the ammonium ion-selective electrode a cocktail of nonactin was deposited. The printed sensors were calibrated with ammonium standard solutions at a working range between 10-5 M to 0.1 M which corresponds to the range of physiological levels of ammonium in sweat before and during physical strain. The potentiometric characterization of the ion-selective sensor shows a linear behaviour of the EMF versus pC values with a Nernstian slope of 59.3 mV ± 11.2 mV.

: http://publica.fraunhofer.de/documents/N-422510.html