Triazine herbicides determination in water with an optical biosensor

Research Area: Uncategorized Year: 2009
Type of Publication: In Proceedings Keywords: bacterial membrane protein;bacterial reaction center deposition;cationic polymer deposition;embedded protein stability;optical biosensor;optical property measurement;polyelectrolyte multilayer formation;quartz substrate;triazine herbicide determination;ag
Book title: Advances in sensors and Interfaces, 2009. IWASI 2009. 3rd International Workshop on
Pages: 213 -217
Month: june
The alternating deposition on quartz of a cationic polymer and the integral bacterial membrane protein called Reaction Centre led to the formation of the polyelectrolyte multilayer called PEM. The PEM revealed to be a valuable tool for the determination of the presence of herbicides in water through the measurement of its optical properties. Among the most striking features of the PEM is the long time stability of the embedded protein that allowed the use of the same specimen for several months without any loss in sensitivity or reproducibility of the determinations. Here further details on the PEM structure and properties will be presented together with a first attempt to overcome the major drawback of the proposed biosensor, i.e.: its poor sensitivity.
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