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A selective sensing of dopa in the presence of adrenaline

โœ Scribed by R.B. Kawde; N.B. Laxmeshwar; K.S.V. Santhanam

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
349 KB
Volume
23
Category
Article
ISSN
0925-4005

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โœฆ Synopsis

A polycarbazole electrode has been developed, which selectively senses L-dopa ( 3,4 -dihydroxy-L-phenylalanine) in a solution containing a mixture of L-dopa and adrenaline. This sensing uses the cyclic voltammetric response of the electrode for Ldopa, which shows an anodic peak at (+0.22 \mathrm{~V}) versus SCE. The complementary peak of dopaquinone occurs at (+0.15 \mathrm{~V}). The polycarbazole electrode does not sense the presence of adrenaline, although its electrochemical oxidation at a Pt electrode occurs at (+0.50 \mathrm{~V}). The polycarbazole electrode has been used for the determination of L-dopa in the presence of adrenaline in the concentration range (1-10 \mathrm{mM}). Amperometric sensing of L-dopa is carried out at (0.40 \mathrm{~V}) and is successful in the above concentration range.

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