An electrochemiluminescence aptasensing platform based on ferrocene-graphene nanosheets for simple and rapid detection of thrombin

作者：Zhuo Bangrong; Li Yuqin; Huang Xiang; Lin Yuejuan; Chen Yaowen^*; Gao Wenhua

来源：Sensors and Actuators B: Chemical , 2015, 208: 518-524.

DOI：10.1016/j.snb.2014.11.064

• Electrochemiluminescence
• Ru(bpy)(3)(2+)
• Thrombin
• Ferrocene graphene nanosheets
• Conformational transformation

In this work, we tactfully constructed an electrochemiluminescence (ECL) aptasensing platform with ferrocene-graphene nanosheets (Fc-GNs) using the ferrocene (Fc) as quench unit to tris(2.2'-bipyridyl) ruthenium (II) [Ru(bpy)(3)(2+)] and the Ru(bpy)(3)(2+) tagged thrombin binding aptamer (Ru-TBA) to recognize the thrombin molecules. Duing to the unique pi-pi interaction between nucleotides and graphene, the Ru-TBA could be preferentially adsorbed on the surface of ferrocene-graphene nanosheets with the signal generator into off-state. The conformational transformation of Ru-TBA leads to the desorption of Ru-TBA from Fc-GNs after the biosensing electrode incubating with the thrombin solution and the ECL "signal-on" was triggered. With the transformation of luminescence signal from "off" to "on", the biosensor exhibited high sensitivity for the determination of thrombin with a detection limit of 0.21 nM. Particularly, the proposed method could be widely applied to the aptamer-based determination of other target analytes.

• 出版日期2015-3-1
• 单位山东第一医科大学; 汕头大学