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|Type:||Artigo de periódico|
|Title:||Immobilization of hexacyanoferrate on a gold self-assembled monolayer, and its application as a sensor for ascorbic acid|
|Abstract:||Hexacyanoferrate (II/III) (HCF) was immobilized on a gold electrode modified with cysteamine (CSTE). The Au/CSTE/HCF/PLL electrode was prepared with layer-by-layer (LBL) technique with HCF and poly-D-lysine (PLL). The Au/CSTE/HCF/PLL electrode presented the electrocatalytic activity for ascorbic acid oxidation. The maximum electrocatalytic current was reached at 0.28 V vs SCE in 0.01 mol L-1 TRIS buffer, at pH 7.0. The Au/CSTE/HCF/PLL electrode response was stable under various oxidation-reduction cycles in TRIS medium, showing that the system is very stable. The solution pH has no effect on the anodic peak potential and anodic peak current in the range from 4 up to 10. The intensity of the anodic peak current varied with the concentration of ascorbic acid from 1 up to 910 mu mol L-1, with a sensitivity of 62.9 nA cm(-2) L mu mol(-1), a detection limit of 0.65 mu mol L-1 and a quantification limit of 2.2 mu mol L-1. The developed sensor was successfully applied for ascorbic acid determination in pharmaceutical samples. The results compared to those obtained with a reference method were statistically the same with 95% of confidence level.|
|Subject:||amperometric sensor for ascorbic acid|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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