功能化聚（吡咯/β-环糊精）薄膜的电合成及分析性能
Electrosynthesis and analytical performances of functionalized poly (pyrrole/beta-cyclodextrin) films.
作者信息
Izaoumen Nissrin, Bouchta Dounia, Zejli Hanane, Kaoutit Mohamed El, Stalcup Apryll M, Temsamani Khalid R
机构信息
Bioelectrochemistry Research Unit, Chemistry Department, University Abdelmalek Essaâdi, Faculty of Sciences of Tétouan, Tétouan, Morocco.
出版信息
Talanta. 2005 Mar 31;66(1):111-7. doi: 10.1016/j.talanta.2004.10.003.
The supramolecular complexing properties of cyclodextrins (CDs) have been investigated inside a conducting polymer environment. In this work, we report the synthesis and characterization of a polypyrrole/beta-cyclodextrin (Ppy/beta-CD) film at a glassy carbon (GC) electrode surface. The polypyrrole/beta-cyclodextrin (Ppy/beta-CD) film was prepared by a simple electropolymerization of a 20:1 mixture of the CD and the pyrrole monomer LiClO(4) supporting electrolyte. The resulting functionalized polymer film features interesting electrochemical properties such as selective, simultaneous and quantitative detection of some organic compounds of interest such as polyhydroxyphenyls and neurotransmitters derived from pyrogallol and catechol. The fabricated electrochemical sensor exhibits a fast and reversible linear response toward catechol within the concentration range of 1.5x10(-7) to 8x10(-6)M and towards pyrogallol within the concentration range of 1x10(-6) to 1x10(-5)M. The detection limit was 4x10(-7) and 1.8x10(-6)M for catechol and pyrogallol, respectively. Studies of neurotransmitters such as epinephrine, metanephrine and l-dopa (l-3,4-dihydroxyphenylalanine), showed better response toward epinephrine and l-dopa than for metanephrine. Calibration curves for these two neurotransmitters were linear over the concentration range of 1x10(-6) to 1x10(-5)M. The detection limit was 4x10(-6) and 1x10(-6), respectively. The complexation capability of the Ppy/beta-CD system is addressed here in terms of structure-electrochemical activity relationship. The mechanical stability of the film is also discussed. Measurements were performed using cyclic voltammetry (CV), scanning electron microscopy (SEM) coupled to energy dispersive analysis of X-ray (EDAX) and electrochemical impedance spectroscopy (EIS).
已在导电聚合物环境中研究了环糊精（CDs）的超分子络合特性。在本工作中，我们报道了在玻碳（GC）电极表面合成和表征聚吡咯/β-环糊精（Ppy/β-CD）薄膜。聚吡咯/β-环糊精（Ppy/β-CD）薄膜通过CD与吡咯单体LiClO₄支持电解质按20:1的混合物进行简单电聚合制备而成。所得功能化聚合物薄膜具有有趣的电化学性质，例如对一些感兴趣的有机化合物（如多羟基苯基以及源自邻苯三酚和儿茶酚的神经递质）进行选择性、同时且定量的检测。所制备的电化学传感器在1.5×10⁻⁷至8×10⁻⁶M的浓度范围内对儿茶酚以及在1×10⁻⁶至1×10⁻⁵M的浓度范围内对邻苯三酚表现出快速且可逆的线性响应。儿茶酚和邻苯三酚的检测限分别为4×10⁻⁷和1.8×10⁻⁶M。对肾上腺素、变肾上腺素和左旋多巴（L-3,4-二羟基苯丙氨酸）等神经递质的研究表明，该传感器对肾上腺素和左旋多巴的响应比对变肾上腺素的响应更好。这两种神经递质的校准曲线在1×10⁻⁶至1×10⁻⁵M的浓度范围内呈线性。检测限分别为4×10⁻⁶和1×10⁻⁶。本文从结构-电化学活性关系的角度探讨了Ppy/β-CD体系的络合能力。还讨论了薄膜的机械稳定性。使用循环伏安法（CV）、与X射线能量色散分析（EDAX）联用的扫描电子显微镜（SEM）以及电化学阻抗谱（EIS）进行了测量。
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