One can also see the effect of the drying temperature of the samples. High sensitivity is shown by electrodes dried at 60 0 C. For some of the electrodes, the response is very noisy, especially at higher concentrations of H2O2. The dependence of sensitivity on the deposition method and drying temperature of the electrodes is not observed in Fig. , showing that deposition at pH 3.5 gives consistent results relatively independent on method. Fig. shows the dependence of the current on the concentration of H2O2 up to 6 mM. It should be noted that such a dependence is linear at low concentrations, and as the sensitivity decreases, All twelve samples of manganese dioxide electrodes were modified by the addition of GOx enzymes solution (1 mg/ml) and fixed by GA. which used as cross-linking agent for enzymes , , . Bonding occurs at amino groups and thus, enzymes are fixed on the surface and are not washed off by electrolyte. The amperometric responses of glucose upon injection to 1 mM of analyte was investigated and the obtained amperograms are shown on Fig. . As in the study of catalysis of hydrogen peroxide decomposition, the i-t dependences were divided into three figures according to the same principle. The time for reaching the steady-state current for all electrodes is not more than 5 seconds. When the surface of electrodes was modified with enzymes, surface morphology began to play an even more significant role. The most active are electrodes where manganese dioxide were deposited cyclically with partial dissolution. Based on SEM images, the CV method provides a branched structure in which the molecules of enzymes can be intercalated. On the other hand, a correlation between the catalytic activity of manganese dioxide and electrodes modified with enzymes was observed. This makes it possible to use the simple and cheap response of hydrogen peroxide as test the biocatalytic propertiesof the electrodes on the base of MnO2.