Figure 5From: Study of zeolite influence on analytical characteristics of urea biosensor based on ion-selective field-effect transistorsCalibration curves for urea determination obtained for biosensors created by urease immobilization. In GA vapour (1), adsorption on transducers covered with monolayer of: silicalite (2), nano beta zeolite (3), zeolite L (4), calcinated nano beta zeolite (5). The measurements were carried out in 5 mM phosphate buffer solution (pH 7.4).Back to article page