一种新型分子印迹聚合物薄膜作为尿酸生物传感器。

A novel molecularly imprinted polymer thin film as biosensor for uric acid.

机构信息

Department of Chemical Engineering, National Taiwan University, Taipei 10617, Taiwan.

出版信息

Talanta. 2010 Jan 15;80(3):1145-51. doi: 10.1016/j.talanta.2009.08.041.

Abstract

A novel amine-imide type conducting polymer, denoted as poly(PD-BCD), was molecularly imprinted on an indium-tin oxide (ITO) glass, with uric acid (UA) as the template and without any functional monomer. Intending to improve the imprinting efficiency, the polymer content was varied from 0.3 to 0.9wt% during the preparation of the molecularly imprinted polymer (MIP), thereby varying the thickness of the polymer film; the content of UA as the template was maintained to be the same for all the films. The sensitivities of the thus prepared MIP electrodes were calculated to be more than 3-fold, compared to those of the corresponding non-MIP (NMIP) electrodes, which were obtained through the same method, however, without adding UA during their preparation. A polymer content of 0.6wt% rendered the best performing MIP electrode, as judged by the imprinting efficiency and sensitivity of the electrode for UA. A linear relationship between steady-state currents and UA concentrations from 0 to 1.125mM was obtained for both types of the sensors. The sensitivities of the MIP and the NMIP electrodes made with 0.6wt% of polymer were calculated to be 24.72 and 6.63microAmM(-1)cm(-2), respectively. The limit of detection (LOD) for this MIP was found to be 0.3microM at a signal to noise ratio (S/N) of 3. This MIP electrode was used as a biosensor for the detection of UA in the presence of ascorbic acid (AA) in a sample containing these species in the same concentrations as those in a human serum. The selectivity of MIP electrode is higher than that of NMIP electrode, and the values are 28.76 and 8.85, respectively. The results are substantiated by using cyclic voltammetry (CV), linear sweep voltammetry, amperometry, and scanning electron microscopy.

摘要

一种新型的胺-酰亚胺型导电聚合物,记为聚(PD-BCD),在氧化铟锡(ITO)玻璃上进行分子印迹,以尿酸(UA)为模板,无需任何功能单体。为了提高印迹效率,在制备分子印迹聚合物(MIP)时,聚合物的含量从 0.3wt%变化到 0.9wt%,从而改变聚合物膜的厚度;所有膜中模板 UA 的含量保持不变。与通过相同方法制备但在制备过程中不添加 UA 的相应非印迹聚合物(NMIP)电极相比,由此制备的 MIP 电极的灵敏度计算超过 3 倍。通过印迹效率和电极对 UA 的灵敏度来判断,聚合物含量为 0.6wt%时,MIP 电极的性能最佳。对于两种类型的传感器,都获得了从 0 到 1.125mM 的 UA 浓度的稳态电流与线性关系。用 0.6wt%聚合物制成的 MIP 和 NMIP 电极的灵敏度分别计算为 24.72 和 6.63microAmM(-1)cm(-2)。该 MIP 的检测限(LOD)在信噪比(S/N)为 3 时发现为 0.3microM。该 MIP 电极被用作在含有这些物质的样品中检测 UA 的生物传感器,这些物质的浓度与人类血清中的浓度相同。MIP 电极的选择性高于 NMIP 电极,分别为 28.76 和 8.85。使用循环伏安法(CV)、线性扫描伏安法、安培法和扫描电子显微镜对结果进行了证实。

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