The effects of ionic strength of the sample solution and enzyme load on the potentiometric response of a urea sensor based on an ion-sensitive field effect transistor (ISFET) were examined. The output voltage of the sensor for urea solutions shifted slightly when NaCl was added to the solutions. The enzyme load on the ISFET gate affected the potentiometric response significantly. The sensor showed a higher response when the ISFET gate was coated with an enzyme membrane with a higher content of urease.
- enzyme sensor
- ion-sensitive field effect transistor
- urea sensor
ASJC Scopus subject areas
- Drug Discovery