Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9754486 | Journal of Pharmaceutical and Biomedical Analysis | 2005 | 6 Pages |
Abstract
Levodopa (l-dopa), the biological precursor of catecholamines, is the most widely prescribed drug in the treatment of Parkinson's disease. The present work presents a proposal for the application of a gold screen-printed electrode an electrochemical sensor for monitoring l-dopa in stationary solution and a flow system. Using the electrooxidation of l-dopa at +0.63 V in acetate buffer pH 3.0 on a gold screen-printed electrode it is possible to obtain a linear calibration curve from 9.9 Ã 10â5 to 1.2 Ã 10â3 mol Lâ1 and a detection limit of 6.8 Ã 10â5 mol Lâ1. Under amperometric conditions (Eapp = 0.8 V; flow rate = 14.1 mL minâ1; pH 3.0), an analytical calibration graph for l-dopa was obtained from 1.0 Ã 10â6 mol Lâ1 6.6 Ã 10â4 mol Lâ1 with a detection limit of 9.9 Ã 10â7 mol Lâ1. The method was successfully applied to the determination of l-dopa in commercial dosage forms without any pre-treatment.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Márcio F. Bergamini, André L. Santos, Nelson R. Stradiotto, Maria Valnice B. Zanoni,