
2014年12月
化学传感器 CHEMICALSENSORS
Vol. 34, No. 4 Dec.2014
基于核酸适体和纳米材料构建电化学生物传感器
用于多巴胺的检测
廖妮,邹雪
(翠枝花学院生物与化学工程学院,四川攀枝花617000)
摘要:该文探究了一种基于核酸适体和纳米金包四氧化三铁(Au@Fe,O)纳米粒子所构建的新型电化学生物传感器用于多巴胺(DA)的检测。首先,在玻碳电极(GCE)表面电沉积一层纳米金(nano-Au)用于多巴胺适体(DBA)的固定。然后HT做为封闭剂以减少非特异性吸附。接着通过与DBA的特异性结合将DA固载于电极表面。在EDC/NHS作用下,生物索(Bio)的发基与DA的氨基结合,最后通过生物素与亲和素特异性识别作用将含有电化学活性物质硫革的编米复合材料固定于电极表面,制得夹心型的适体传感器。在最优条件下,该传感器对0.001nmol/L~100nmol/LDA的检测具有良好的电流响应,检出限0.33pmol/L(S/N=3)。该适体传感器具有操作简单、操作简便、选择性好、灵敏度高、检测范围广、检出限低的优点。
关键词:电化学适体传感器;多巴胺;金包四氧化三铁;硫董;生物素-亲和素系统
Anovel electrochemical aptasensorfor sensitivedetectionof dopaminebasedonnucleicacidaptamerandnanomaterials
Liao Nit, Zou Xue
(College of Biological and Chemical Engineering, Panzhihua University, Panzhihua 617000, China)
Abstract: In this work, a novel strategy was constructed based on nucleic acid aptamer and nanomaterials for the sensitive detection of dopamine (DA).The thiolated dopamine binding aptamer (DBA) were firstly immobilized on the gold nanoparticles (nanoAu) modified glassy carbon electrodes (GCE). In the presence of target DA, the DBA could catch the DA onto the electrode surface. The anchored DA was then derivatized with biotin for the attachment of the conjugates which contain the electron media thionine to contrast a sandwichtype aptasensor. Under the optimal conditions, a wide detection range from 0.001 nmol/L to 100 nmol/L and a low detection limit of 0.33 pmol/L(defined as S/N = 3) for DA were obtained. In addition, the sensor exhibited the advantages of simple operation, easy to operate, good selectivity, high sensitivity.
Key words: electrochemical aptasensor, dopamine; Au@Fe,O thionine; biotinavidin system
容性等这独特的物理和化学性质,使其在纳米
0引言
电化学生物传感器发展至今!),提高其灵敏度和增强电极的响应信号仍然是电化学传感器研究探讨的一项关键内容。纳米技术的出现为纳米材料在生物大分子的组装及生物传感器(2~4]领域的应用开辟了新的思路。纳米材料15-71由于具有比表面积大、表面自由能高以及优良的生物相
科学领域受到广泛的重视,同时也推动了化学和生物传感器的迅速发展。在生物传感器的构建及提高检测的灵敏度方面,纳米材料都显示出卓越的优势。在纳米修饰电极中,组装的纳米材料具有大的表面积,可以固载成百上千的信号分子,因而可以对检测信号起到扩增的作用。而细小的纳米粒子可渗透到生物大分子内部接触到生物
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