Biosensor is a device consisting of immobilised layer of biological material such as enzyme, antibody, hormone, nucleic acids, organelles or whole cells and its contact with sensor.
the sensor converts biological signals into an electrical signal. it is used in medicines and industry:
1. Blood glucose level can be detected.
2. production of any toxin in the body due to infection can be detected.
3. pollution in drinking water can be monitored.
4. odour, freshness and taste of food can be measured.