This document provides an introduction to chemical sensors and biosensors. It defines a biosensor as a chemical sensor that uses a biological component like an enzyme, antibody, or cell to detect analytes. Biosensors can use whole organisms, cells, or biological molecules in their detection. They are used in medical applications and for determining food and environmental quality. Biosensors typically have two stages - a biological recognition element that selectively detects the analyte, and a transducer that converts this to an electrical signal. An example is given of a glucose biosensor that uses the enzyme glucose oxidase and detects changes in oxygen or hydrogen peroxide levels. Key parameters for biosensors like sensitivity, range, and response time are also defined.

Biosensors and Instrumentation: Lecture 1: Introduction To Chemical Sensors & Biosensors PDF

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