Sensor 1 voltammetric response to 1,2-benzoquinone in the
above mentioned optimal conditions and different incubation
times in 100 g mL−1 trypsin solution is presented in Fig. 2. As
expected, the kinetic barrier for the transport of the electroactive
specie to the electrode surface created by the hydrogel film
suppressed almost totally the sensor response before trypsin incubation.
Gelatin film digestion resulted in reduction peak current
increase up to a maximal value, corresponding to the complete
hydrogel degradation.