Electrodeposition of 4-Benzenesulfonic Acid onto a Graphite-Epoxy Composite Electrode for the Enhanced Voltammetric Determination of Caffeine in Beverages

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left">Sample</td><td class="align_center">Voltammetry (mg·L<sup>−1</sup>)</td><td class="align_center">HPLC (mg·L<sup>−1</sup>)</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">Black tea 1</td><td class="align_center">264.28 ± 15.08</td><td class="align_center">280.01 ± 10.73</td></tr><tr><td class="align_left">Black tea 2</td><td class="align_center">345.31 ± 12.54</td><td class="align_center">340.10 ± 6.15</td></tr><tr><td class="align_left">Green tea</td><td class="align_center">430.21 ± 3.67</td><td class="align_center">433.56 ± 1.32</td></tr><tr><td class="align_left">Guarana drink</td><td class="align_center">65.26 ± 4.03</td><td class="align_center">66.36 ± 1.26</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Caffeine determination via voltammetric and HPLC methods in real samples (<i>n</i> = 3).</div>

Journal of Analytical Methods in Chemistry

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Table 3

Table 3: Electrodeposition of 4-Benzenesulfonic Acid onto a Graphite-Epoxy Composite Electrode for the Enhanced Voltammetric Determination of Caffeine in Beverages 

Table 3 | Electrodeposition of 4-Benzenesulfonic Acid onto a Graphite-Epoxy Composite Electrode for the Enhanced Voltammetric Determination of Caffeine in Beverages 