A recently synthesized conducting polymer poly(TBT6–NH2); poly(6-(4,7-di(thiophen-2-yl)-2H-benzo[d][1,2,3]triazol-2-yl)hexan-1-amine) was utilized as a matrix for biomolecule immobilization. After successful electrochemical deposition the polymer poly(TBT6–NH2) on the graphite electrodes, immobilization of choline oxidase (ChO) was carried out. Due to the free amino functional groups of the polymeric structure, ChO molecules were successfully immobilized onto the polymer surface via covalent binding. For this, glutaraldehyde (GA) was used as crosslinker and bifunctional agent. Hence, a robust binding between the support and the protein molecules was achieved. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) were used to monitor the surface morphologies of both the polymer and the bioactive layer and to confirm the binding of the protein. Amperometric measurements were recorded by monitoring oxygen consumption in the presence of choline as the substrate at −0.7 V. The optimized biosensor showed a very good linearity between 0.1 and 10 mM with a 7 s response time and a detection limit (LOD) of 16.8 μM to choline. Also, kinetic parameters, operational and storage stabilities were determined. Finally, designed system was applied for pesticide detection.
最近合成的导电聚合物聚(TBT6-NH2);聚(6-(4,7-二(
噻吩-2-基)-2H-苯并[d][1,2,3]三唑-2-基)己-1-胺)被用作固定
生物分子的基质。聚合物聚(TBT6-NH2)在石墨电极上成功电
化学沉积后,进行了
胆碱氧化酶(ChO)的固定。由于聚合物结构中的游离
氨基官能团,
胆碱氧化酶分子通过共价结合成功固定在聚合物表面。为此,
戊二醛(GA)被用作
交联剂和双功能剂。因此,支撑物和蛋白质分子之间实现了牢固的结合。扫描电子显微镜(
SEM)和 X 射线光电子能谱(XPS)用于监测聚合物和
生物活性层的表面形态,并确认蛋白质的结合。在 -0.7 V 电压下,通过监测以
胆碱为底物时的耗氧量,记录了安培测量值。优化后的
生物传感器在 0.1 至 10 mM 之间显示出非常好的线性,响应时间为 7 秒,对
胆碱的检测限(LOD)为 16.8 μM。此外,还确定了动力学参数、操作和储存稳定性。最后,设计的系统被应用于农药检测。