A Label‐Free Electrochemical Aptasensor for Thrombin Using a Single‐Wall Carbon Nanotube (SWCNT) Casted Glassy Carbon Electrode (GCE) |
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| Authors: | Kyungsoon Park Seong Jung Kwon Juhyoun Kwak |
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| Institution: | 1. Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305‐701, Korea;2. These authors contributed equally to this work;3. Department of Chemistry, Konkuk University, 120 Neungdong‐ro, Gwangjin‐gu, Seoul 143‐701, Korea |
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| Abstract: | An electrochemical aptasensor with a thrombin binding aptamer (TBA) was developed using a single‐wall carbon nanotube (SWCNT) casted GCE. The TBA was immobilized on SWCNTs through π‐stacking without any special modification, resulting in helical wrapping to the surface. In the presence of thrombin, the TBA binds with thrombin and the TBA concentration on the SWCNT surface decreases. The remaining amount of TBA can be analyzed by an electrochemical method without any label, because the guanine bases of the nucleic acid are measurable by electrochemical methods. The electrochemical oxidation of guanine nucleotides was enhanced by electrocatalytic mediation using Ru(bpy)32+ for higher sensitivity and reduction of the overpotential for electrochemical detection. |
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| Keywords: | Single‐wall carbon nanotubes (SWCNT) Aptasensor Thrombin binding aptamer (TBA) Electrochemical detection |
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