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. 2021 Feb 18;12(2):208. doi: 10.3390/mi12020208

Figure 3.

Figure 3

Representative schematics of different generations of amperometric enzyme biosensors. (A) First generation biosensor wherein the byproduct H2O2 is used for electron transfer. (B) Second generation biosensor wherein an artificial redox mediator is used for electron transfer. (C) Third generation biosensor wherein the enzyme itself is used for electron transfer.