Biosensors are increasingly
taking a more active role in health
science. The current needs for the constant monitoring of biomedical
signals, as well as the growing spending on public health, make it
necessary to search for materials with a combination of properties
such as biocompatibility, electroactivity, resorption, and high selectivity
to certain bioanalytes. Conducting polymer hydrogels seem to be a
very promising materials, since they present many of the necessary
properties to be used as biosensors. Furthermore, their properties
can be shaped and enhanced by designing conductive polymer hydrogel-based
composites with more specific functionalities depending on the end
application. This work will review the recent state of the art of
different biological hydrogels for biosensor applications, discuss
the properties of the different components alone and in combination,
and reveal their high potential as candidate materials in the fabrication
of all-organic diagnostic, wearable, and implantable sensor devices.