serum is described. It is based on the use of a carbon nanotubes-modified screen printed
electrode covered with an electropolymerized poly (thionine) film and an outer cross-linked
layer containing tyrosinase. Further coverage of the sensor with a Nafion layer allows its use
directly in human serum, obviating the need for sample pretreatment. The sensor exhibited a
linear behavior in the 0.8–22 μM concentration range and offers promise for decentralized …