Examples of Electrochemical Enzymatic Biosensors for Food Analysis

4 Examples of Electrochemical Enzymatic Biosensors for Food Analysis 

Enzyme-based biosensors have been developed both with potentiometric as well as amper-ometric transducers. Different potentiometric transducers have been used including the glass electrode for the measurement of pH or monovalent ions, specific electrodes sensitive to anions or cations, and gas electrodes such as PCO2 0 PNH3 electrodes. If an amperomet-ric electrode is used as the transducer of a biosensor, a consumption of reaction products is involved this is the major difference from a potentiometric electrode. Different types of electrodes can be used in amperometric biosensor sueh as oxygen sensor, gold, platinum, or graphite electrodes. 

Sometimes the three modes of oxidation reactions that occur in biosensors are referred to as first-, second-, and third-generation, as follows [20] 

First generation - oxygen sensor based systems. 

Third generation - directly coupled enzyme electrodes. 

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