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      Sodium dodecyl sulfate-modified carbon paste electrodes for selective determination of dopamine in the presence of ascorbic acid

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      Bioelectrochemistry
      Elsevier BV

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          Abstract

          <p class="first" id="d14188171e59">A carbon paste electrode (CPE) modified by a monolayer film of sodium dodecyl sulfate (SDS) was used for detection of dopamine (DA). Cyclic voltammetry demonstrated improved response of the DA sensor. This suggests the effectivity of surface modification of CPE by SDS. Impedance spectroscopy was used for the characterization of CPE surface properties. The effect of SDS concentration on the electrode quality also reveals that SDS formed a monolayer on CPE surface with a high density of negative-charged end directed outside the electrode. As a result, the carbon paste electrode modified with SDS (SDS/CPE) exerted discrimination against ascorbic acid in physiological circumstance. Thus, it can selectively determine dopamine even in the presence of 220-fold AA combined with differential pulse stripping voltammetry. In pH 7.40 phosphate buffer solution, the oxidation peak current on differential pulse voltammograms increases linearly with the concentration of DA in the range of 5.0 x 10(-7) to 8.0 x 10(-4) mol . L(-1) with a detection limit of 5.0 x 10(-8) mol . L(-1). Satisfying results are achieved when detecting the DA in injection and simulated biology sample. </p>

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          Author and article information

          Journal
          Bioelectrochemistry
          Bioelectrochemistry
          Elsevier BV
          15675394
          May 2007
          May 2007
          : 70
          : 2
          : 408-415
          Article
          10.1016/j.bioelechem.2006.05.011
          16843072
          247d25d9-96ec-41ce-9809-ef76ee9a780b
          © 2007

          https://www.elsevier.com/tdm/userlicense/1.0/


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