Impedimetric or Ion-Sensitive Field-Effect Transistor (ISFET) Aptasensors Based on the Self-Assembly of Au Nanoparticle-Functionalized Supramolecular Aptamer Nanostructures
✍ Scribed by Etery Sharon; Ronit Freeman; Ran Tel-Vered; Itamar Willner
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 246 KB
- Volume
- 21
- Category
- Article
- ISSN
- 1040-0397
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Two electrical methods (Faradaic impedance spectroscopy and ion‐sensitive field‐effect transistor (ISFET)) are applied to sense aptamer‐substrate complexes. The methods utilize anticocaine aptamer fragments that self‐assemble, in the presence of cocaine, to a supramolecular aptamer fragments/cocaine complex on the electrode surface or ISFET gate. One of the aptamer fragments is assembled on a Au electrode or the ISFET gate. The second thiolated aptamer fragment is used to modify Au NPs that are used as amplifying labels for the two detection schemes. The impedimetric and ISFET methods enabled the analysis of cocaine with detection limits of 1×10^−5^ M and 1×10^−6^ M, respectively.