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首页> 外文期刊>Electroanalysis >Electrochemical behavior of catecholamines and related compounds at in situ surfactant modified carbon paste electrodes
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Electrochemical behavior of catecholamines and related compounds at in situ surfactant modified carbon paste electrodes

机译：儿茶酚胺及相关化合物在原位表面活性剂修饰的碳糊电极上的电化学行为

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摘要

The voltammetric characteristics of catecholamines: epinephrine (E) and norepinephrine (NE) and related compounds: isoproterenol, metanephrine, L-dopa, metbyldopa, vanillylmandelic acid (VMA), and homovanillic acid (HVA) at unmodified and in situ surfactant-modified carbon paste electrodes were comparatively evaluated. For the basic and amphoteric compounds the modification of the electrode surface with submicellar concentrations of anionic surfactants (sodium dodecylsulfate, sodium decylsulfate or sodium dodecylsulfonate) produce an important current enhancement in its oxidation and reduction peak current together with the improvement in the reversibility of the processes. These effects were explained in basis on electrostatic and hydrophobic interactions. On the other hand, the oxidation of acidic metabolites, HVA and VMA, was studied at electrodes modified in situ with cationic surfactants. Under certain conditions the surfactant could stabilise some of the electrochemical reaction intermediates, thus explaining the different voltammetric behaviour of HVA and VMA.
机译：儿茶酚胺的伏安特性：肾上腺素（E）和去甲肾上腺素（NE）以及相关化合物：异丙肾上腺素，间肾上腺素，L-多巴，美比多巴，香草戊二酸（VMA）和高香草酸（HVA）在未经修饰和原位表面活性剂修饰的碳上对糊状电极进行了比较评估。对于碱性和两性化合物，用亚微米浓度的阴离子表面活性剂（十二烷基硫酸钠，十二烷基硫酸钠或十二烷基磺酸钠）修饰电极表面，可在其氧化和还原峰值电流方面产生重要的电流增强作用，并改善过程的可逆性。这些作用是根据静电和疏水相互作用来解释的。另一方面，在用阳离子表面活性剂原位修饰的电极上研究了酸性代谢物HVA和VMA的氧化。在某些条件下，表面活性剂可以稳定一些电化学反应中间体，从而解释了HVA和VMA的不同伏安行为。

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