Biosensor:-

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A biosensor is an analytical device used for detection of an analyte ,that combines with a biological component with a physiochemical detector.
#. biosensors are analytical devices that converts biological actions into electrical signals in order to quantify them.it include the recognition of enzyme for their substrate or other ligand , antibodies for their antigens , lectins for carbohydrate and nucleic acid or peptide nucleic acid for their complementary  sequences..

BIOSENSOR-----1.CHEMICAL BIOSENSOR :-
                                       a> electrochemical biosensor.
                                       b> amperometric biosensor.
                                       c> impedimetric biosensors.
                                       d> potentiometric biosensors.
                                       e> voltammetric biosensors.
                              2. PHYSICAL BIOSENSORS :-
                                       a> piezoelectric biosensors.
                                       b> optical biosensors.

----Principal development of new area of biosensors is of optical biosensors.

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