The detection limit of 21 nM was achieved. Under the optimal conditions, the proposed electrode exhibited interesting sensitivity toward determination of doxepin compared to the other conventional electrodes and the anodic peak current versus doxepin concentration was linear in the ranges of 0.05-24 µM. Various parameters were optimized for practical application. Differential pulse voltammetry was applied as an analytical technique for quantification of sub-micromolar concentration of doxepin. The surface of the proposed electrode was characterized by scanning electron microscopy. In this manuscript, the electrocatalytic oxidation of doxepin (DOX) was studied at a carbon ionic liquid electrode, fabricated using graphite, and the ionic liquid 1-octylpyridinium hexaflourophosphate (OPFP).
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