Use of phosphate activated glassy carbon electrode in voltammetric determination of epinephrine

• En este artículo la protagonista es la voltamperometría cíclica, que permite determinar cantidades traza de epinefrina mediante la utilización de un electrodo vítreo de carbono activado con fosfato. 

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• Phosphate activated GCE was prepd. by cyclic voltammetry, and the electrochem. behavior of epinephrine (EP) at this electrode in a phosphate buffer medium of pH 6.0 was studied.  A cyclic voltammetric method for detn. of trace amt. of EP was proposed, by which the interference of ascorbic acid to the detn. of EP was effectively eliminated.  A sensitive oxidn. peak of EP at 0.26 V (vs. SCE) was obsd.  Linear relationship between values of oxidn. peak current (i_pa) and concn. of EP was obtained in the range of 1.0 × 10^-6-1.2 × 10^-5 mol·L^-1, with detection limit (3S/N) of 3.0 × 10^-7 mol·L^-1.  This method was applied to the detn. of EP in injections, giving results in consistency with the labeled values.  Av. recovery of the method found by std. addn. method was 99.7%.
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•  Li, Jin-jin; Wang, Xue-liang; Guo, Xian-hou; Yu, Zhang-yu
• Lihua Jianyan, Huaxue Fence (2012), 48(7), 766-769