ABSTRACT
Biosensors are analytical devices that use a biological or biologically derived material immobilized at a transducer to measure one or more analytes. The evolution in biosensor technology is directly related to the evolution of materials, of knowledge of biochemical systems, and of detection techniques. The transducer must be selected according to the product obtained in the biochemical reaction, and it can be electrochemical, optical, or piezoelectric. The advantages of using it as a transducer in biosensor technology include low background current, wide potential range, lack of adsorption, and high signal-to-noise and signal-to-background ratios. An amperometric biosensor based on aligned multiwall carbon nanotubes grown on platinum substrate was proposed. The biosensor are incorporated into the conduits of an sequential injection analysis system constructed from a Gilson Minipuls peristaltic pump and a 10-port electrically actuated selection valve. Due to the high reliability ensured by biosensors, they can be successfully used as detectors in flow systems.
