Sensor Used in E-nose - The Electronic Nose Artificial Olfaction Technology - page 150

Fig. 6.7 Application of biosensor

9. Biocompatibility—minimize clotting, platelet interactions, activation of com-
plement when in direct contact with bloodstream.

Application of biosensor
There are many applications available with various types of biosensors. The
critical requirements of a biosensor include for research and commercial appli-
cations, which are required for the identification of selected molecules, i.e., glu-
cose monitoring in diabetes patients, detection of pesticides in water contaminants,
detection of pathogens, determining levels of toxic substances before and after
bioremediation, etc. Some major applications are classified in Fig. 6.7 .

6.4 Types of Sensor Used in E-nose

Selection of biosensor technology relies on many factors, which can be divided
into three groups:

1. The nature of the analyte to be identified;
2. The nature of the sample evaluation;
3. The principle and the condition of the analysis.

All types of sensors reveal communications with the gas to be measured when
volatile compounds flow over the sensor and due to that a series of physical and
chemical interactions are established.
The ideal sensors to be added in an electronic nose (E-nose) should accomplish
the following criteria:

• High sensitivity to chemical compounds, i.e., similar to the human nose near to
10 -12 g/mL.
• Low sensitivity designed for humidity and temperature.