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Table 1 Comparison of operational characteristics of biosensors created using different types of urease immobilization

From: Study of zeolite influence on analytical characteristics of urea biosensor based on ion-selective field-effect transistors

Type of immobilization

Noise (μA)

Drift of base line (μA/min)

Detection limit (mM)

RSd of reproducibility of signal (%)

RSd of inter-reproducibility of immobilization (%)

Linear range (mM)

In GA vapour

0.02

0.010

0.0015

8.5

27.4

0 to 0.5

On the surface of silicalite monolayer

0.03

0.028

0.0015

4.7

10.5

0 to 1.5

On the surface of nano beta zeolite monolayer

0.03

0.001

0.0015

3.4

17.8

0 to 1.0

On the surface of zeolite L monolayer

0.06

0.004

0.0050

4.5

15.4

0 to 1.5

On the surface of calcinated nano beta zeolite monolayer

0.09

0.013

0.0055

4.7

14.3

0 to 1.0

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