十六烷基三甲基溴化铵（CTAB）在用六氰合铁酸锡修饰的碳糊电极测定多巴胺和抗坏血酸中的作用。
Effect of cetyltrimethyl ammonium bromide (CTAB) in determination of dopamine and ascorbic acid using carbon paste electrode modified with tin hexacyanoferrate.
作者信息
Hosseinzadeh Reza, Sabzi Reza E, Ghasemlu Khosrow
机构信息
Food & Chemical Analysis Research Lab., Academic Center for Education, Culture and Research (ACECR; Jahad-e-Daneshgahi), Urmia Branch, Urmia University, Urmia, Iran.
出版信息
Colloids Surf B Biointerfaces. 2009 Feb 1;68(2):213-7. doi: 10.1016/j.colsurfb.2008.10.012. Epub 2008 Nov 6.
The cationic surfactant, cetyltrimethyl ammonium bromide (CTAB) effect on accurate determination of dopamine in the presence of ascorbic acid (as natural obtrusive in determination of dopamine) using chemically modified electrode based on tin hexacyanoferrate (SnHCF) as a modifier at carbon paste electrode (CPE) is described. The electrochemical response of bare CPE and SnHCF modified electrode (ME) examined in different pHs, in absence and presence of different concentration of dopamine (DA) and ascorbic acid (AA). In addition a simple and reliable method for simultaneous electrochemical determination of AA and DA was presented. It was based on the use of the cationic surfactant CTAB that enables the separation of the oxidation peaks potential of AA and DA. The experimental results showed that DA and AA have two separate peaks. In pH 3 and at presence of 3mM of CTAB the separation of DA and AA peaks and the eminence of them increased evidently. Good linear response to AA and DA was observed in the range of 0.4-50 and 0.2-25mM with the correlation of 0.9912 and 0.9955, respectively.
描述了阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）对基于六氰合铁酸锡（SnHCF）修饰的碳糊电极（CPE）在抗坏血酸（在多巴胺测定中作为天然干扰物）存在下准确测定多巴胺的影响。研究了裸CPE和SnHCF修饰电极（ME）在不同pH值下，以及在不同浓度多巴胺（DA）和抗坏血酸（AA）存在与不存在时的电化学响应。此外，还提出了一种同时电化学测定AA和DA的简单可靠方法。该方法基于使用阳离子表面活性剂CTAB，它能够分离AA和DA的氧化峰电位。实验结果表明，DA和AA有两个分离的峰。在pH为3且存在3mM CTAB时，DA和AA峰的分离以及它们的峰高明显增加。在0.4 - 50mM和0.2 - 25mM范围内观察到对AA和DA的良好线性响应，相关系数分别为0.9912和0.9955。
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