Abstract
In this article, we present a smartphone-based biosensor for detection of the ammonium ion in sweat. The sensing system consists of a sample collection chip, an ammonium ion selective electrode by screen printing, a potential reading chip and a smartphone. When the sweat flows through the sensitive membrane, a membrane potential is generated which can be captured by the potential reading chip linked with the smartphone. The potential signal was then converted to concentration value by a calibration curve. The detection can be achieved within one minute with good repeatability, and the level of the ammonium ion in sweat can reflect the body state during exercise.
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