Introduction to Biosensors



Definition of a biosensor

A biosensor:
A device that uses specific biochemical reactions mediated by isolated enzymes, immunosystems, tissues, organelles or whole cells to detect chemical compounds usually by electrical, thermal or optical signals.

Common signal error sources

Inhomogenous sample
Bubbles/flow artifacts
Temperature
Electromagnetic interferance
Electronic unstability
Unstable chip/detection layer

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INTRODUCTION
¢ A biosensor is a device for the detection of an analytic that combines a biological component with a physicochemical detector component. Many optical biosensors based on the phenomenon of surface plasmon resonance are evanescent wave techniques . The most widespread example of a commercial biosensor is the blood glucose biosensor, which uses the enzyme glucose oxidase to break blood glucose down

Biosensor consist of
¢ 1.the sensitive biological element
¢ 2.the transducer or detec ....etc

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ABSTRACT
Fiber-optic DNA biosensors are a kind of ana-lytic setups, which convert the Waston-Crick base pairs matching duplex or Hoogsteen’s tri-plex (T/A-T, C/G-C) formation into a readable analytical signals when functionalized single- strands DNA (ssDNA) or double-strands DNA (dsDNA) of interest are immobilized on the sur-face of fiber-optic hybrids with target DNA or interacts with ligands. This review will provide the information about the fiber-optic DNA bio-sensors classified into two categories depend-ing on the end fiber an ....etc

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ABSTRACT
Recent advancements in miniature devices have fostered a dramatic growth of interest of wearable technology. Wearable Bio-Sensors (WBS) will permit continuous cardiovascular (CV) monitoring in a number of novel settings. WBS could play an important role in the wireless surveillance of people during hazardous operations (military, firefighting, etc) or such sensors could be dispensed during a mass civilian casualty occurrence. They typically rely on wireless, miniature sensors enclosed in ring or a shirt. They take ....etc

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Biosensors for environmental applications Future development trends*


INTRODUCTION
Public concern and legislation are nowadays demanding better environmental control. In addition, the
increase in the number of analytes to monitor requires more suitable analytical methods. For conventional
“off-site” analysis, samples need to be sent to a laboratory for testing. Conventional methods are
actually reaching the highest accuracy with low detection limits, bu ....etc

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