Calibration 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).
Shelyakina et al. Nanoscale Research Letters 2014 9:124 doi:10.1186/1556-276X-9-124