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nature : use of biological activity and the analytes reaction, the reaction physical and chemical changes in the volume of ECG changes or photoelectric signal devices. Main (1) biosensor. Put the measured substrate with the enzyme selective response in the fixed-ion selective electrode surface is made of. Describing the substrate is all organic matter, the enzyme catalyst, the product generated by catalytic electrode response and detection. For example, determination of the enzyme glucose sensor. (2) sensor bacteria or organization. Good stability, but not selective biosensor. For example, determination of amino acid sensor. (3) immune sensor. Can detect antigens or antibodies, such as the use of iodine ion selective electrode can be measured hepatitis B antigen. (4) field effect transistor (FET) Biological electrochemical sensor. Put enzyme or other identifying material and son of ion-selective field-effect transistor (ISFET) combined constitute the new generation of biological electrochemical sensor. For example, in ISFET gate insulation layer fixed penicillinase, constitutes penicillin sensor.
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