Differential pulse voltammetry detection of dopamine and ascorbic acid by permselective silica mesochannels vertically attached to the electrode surface
Differential pulse voltammetry detection of dopamine and ascorbic acid by permselective silica mesochannels vertically attached to the electrode surface
复制标题
通过垂直附着在电极表面的选择性渗透二氧化硅介孔微分脉冲伏安法检测多巴胺和抗坏血酸
DOI：
10.1039/c4an00605d
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发表时间：
2014-08-21
期刊：
影响因子：
4.2
通讯作者：
Su, Bin
中科院分区：
文献类型：
--
作者：
Li, Wanzhen;Ding, Longhua;Su, Bin
采用计时电位法在氧化铟锡（ITO）修饰的玻璃电极表面制备了高度有序、垂直取向的氧化硅介孔（SMC）薄膜。中通道具有直径为2-3 nm的均匀孔径和由于接枝的铵基团而带正电荷的表面。表面电荷和离子缓冲液浓度的控制所产生的静电效应和空间位阻效应使SMC具有选择性渗透性，有利于带相反电荷的物质的传质，而排斥带相似电荷的物质的传质。通过使用差分脉冲伏安法（DPV），具有这种电荷选择性的SMCs可以用于选择性渗透检测抗坏血酸（AA）和多巴胺（DA），这是相反电荷的化合物。AA和DA的线性检测范围分别为49-2651 μ M和20-226 μ M。用该修饰电极测定了真实的样品中的AA和DA。
A thin film consisting of highly ordered and vertically oriented silica mesochannels (SMCs) was prepared on the indium tin oxide (ITO) coated glass electrode surface by chronopotentiometry. The mesochannel has a uniform pore size of 2-3 nm in diameter and a positively charged surface due to grafted ammonium groups. The electrostatic and steric effects resulted from control of the surface charge and the ionic buffer concentration make the SMCs permselective, favoring the mass transport of oppositely charged species and repelling that of similarly charged ones. By using differential pulse voltammetry (DPV), the SMCs with this charge selectivity can be employed for permselective detection of ascorbic acid (AA) and dopamine (DA) that are oppositely charged compounds. The obtained linear detection range was 49-2651 mu M for AA and 20-226 mu M for DA, respectively. AA and DA in real samples were also determined by the SMC film modified electrode.