A label-free platform for dopamine biosensing
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Jesús Navarro1, Javier Galbán1, Susana de Marcos1
1Analytical Biosensors Group, Analytical Chemistry Department, Faculty of Sciences, Aragón Institute of Nanoscience, University of Zaragoza, 50009-Zaragoza, Spain.
Aim:
This work presents a label-free platform for dopamine (DA) monitoring based on the spectroscopic properties of laccase.
Results:
Working in batch mode, DA ranging from 25 to 250 μM, can be determined without the interference of norepinephrine and epinephrine. Laccase immobilized in a polyacrylamide film is the basis of a platform for the label-free determination of DA. The linear range goes from 100 to 900 μM with an RSD of 5.3% and a film lifetime of more than 30 measurements. The biosensors also permit the DA + epinephrine + norepinephrine determination.
Conclusion:
The method permits the determination of DA and the total concentration of the three neurotransmitters, and could be used for DA monitoring in urine samples.
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