用4-磺酸苯修饰的碳纤维微电极对儿茶酚胺的灵敏度和选择性有所提高。
Carbon-fiber microelectrodes modified with 4-sulfobenzene have increased sensitivity and selectivity for catecholamines.
作者信息
Hermans Andre, Seipel Andrew T, Miller Charles E, Wightman R Mark
机构信息
Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
出版信息
Langmuir. 2006 Feb 28;22(5):1964-9. doi: 10.1021/la053032e.
Abstract
Elliptical and cylindrical geometries of carbon-fiber microelectrodes were modified by covalent attachment of 4-sulfobenzenediazonium tetrafluoroborate following its electroreduction. Elliptical electrodes fabricated from Thornel P-55 carbon fibers show the highest amount of 4-sulfobenzene attached to the electrode. Fast-scan cyclic voltammetry was used to compare the response to dopamine and other neurochemicals at these modified carbon-fiber microelectrodes. The grafted layer causes an increased sensitivity to dopamine and other positively charged analytes that is due to increased adsorption of analyte in the grafted layer. However, this layer remains permeable to negatively charged compounds. Modified electrodes retain the increased sensitivity for dopamine during measurements in mouse brain tissue.
摘要
碳纤维微电极的椭圆形和圆柱形几何形状在4-磺基苯重氮四氟硼酸盐电还原后通过共价连接进行了修饰。由Thornel P-55碳纤维制成的椭圆形电极显示出附着在电极上的4-磺基苯数量最多。使用快速扫描循环伏安法比较这些修饰后的碳纤维微电极对多巴胺和其他神经化学物质的响应。接枝层导致对多巴胺和其他带正电荷的分析物的灵敏度增加，这是由于分析物在接枝层中的吸附增加。然而，该层对带负电荷的化合物仍然是可渗透的。在小鼠脑组织测量过程中，修饰电极对多巴胺保持增加的灵敏度。
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