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nature : the use of various biological or biological substances for Molecular Recognition of sensor components. It is the use of bioactive substances and the analytes reaction, the reaction physical and chemical changes in the volume of ECG changes or optical signal devices. For example, glucose oxidase grapes embedded in polyacrylamide gel made of colloids membrane and the membrane fixed on the oxygen electrode, made of glucose sensors, the use of glucose oxidase can identify it quickly and glucose oxidation and oxygen electrode detection reagent oxygen content changes in the indirect determination of glucose levels. Biosensors can be divided into the following categories : (1) enzyme sensor; (2) Organizational sensor; (3) microbial sensor; (4) immune and enzyme immunoassay sensor; (5) FET biosensor. They are composed of two main parts, the first being in the material (substrate) is highly selective molecular recognition capability posed by the membrane receptor; Another of the film is able to conduct biochemical reaction consumption or production of chemical substances or the light and heat into electrical signals transducer. The signal via electronic processing technology, the equipment on display or recorded. Biosensors with high selectivity, specificity, trace and simplicity. Widely used in medicine, agriculture, biology, environmental protection and so on the determination and life sciences research.
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