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- E-ISSN 2288-8985
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Dopamine determination using a biosensor based on multiwall carbon nanotubes paste and burley tobacco-peroxidase
Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
2015, v.28 no.2, pp.98-105
https://doi.org/10.5806/AST.2015.28.2.98
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(2015). Dopamine determination using a biosensor based on multiwall carbon nanotubes paste and burley tobacco-peroxidase. Analytical Science and Technology, 28(2), 98-105, https://doi.org/10.5806/AST.2015.28.2.98
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Abstract
The development of an enzymatic biosensor for dopamine determination based on multiwall carbon nanotubes (MWCNTs) and peroxidase obtained from the crude extract of burley tobacco (Nicotiana tabacum L.) was proposed. Peroxidase catalyzes the oxidation of dopamine to dopamine quinone. The influence on the response of analytical parameters of biosensors such as enzyme concentration, dopamine concentration, pH, and phosphate buffer solution concentration were investigated. The analytical parameters obtained, including sensitivity, linearity, and stability, were investigated. The proposed method for dopamine determination presented good selectivity even in the presence of uric acid and ascorbic acid. The sensor presented a higher response for dopamine in 0.010 M phosphate buffer at pH 6.50, with an applied potential of -0.15 V. The detection limit of the electrode was 2.7×10−6 M (S/N = 3) and the relative standard deviation of the measurements, which were repeated 10 times using 5.0×10−2 M dopamine, was 1.3%.
- keywords
- burley tobacco biosensor, dopamine, multiwall carbon nanotube
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