کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
870347 | 1470993 | 2007 | 4 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Detection of Rev peptides with impedance-sensors — Comparison of device-geometries Detection of Rev peptides with impedance-sensors — Comparison of device-geometries](/preview/png/870347.png)
Two different impedance-sensor geometries have been compared for the detection of Rev peptides with a molecular weight of 2.4 kDa. Planar, two-dimensional interdigitated capacitor (IDC) sensors with electrode separations of 1.1 μm as well as three-dimensional nanogap-sensors with an electrode separation of 75 nm have been used. Both sensors have been operated at a fixed frequency of 980 MHz. We discuss the specific interaction of the Rev peptide to an immobilized RNA anti-Rev aptamer (9.2 kDa) for peptide concentrations in the range of 100 nM–2 μM. For the IDC sensor, only peptide concentrations above 500 nM gave detectable signals. For the nanogap sensor, the binding process was clearly visible for all concentrations applied. The higher sensitivity of the nanogap compared to the IDC is ascribed to the improved surface-to-volume ratio.
Journal: Biosensors and Bioelectronics - Volume 22, Issues 9–10, 15 April 2007, Pages 2337–2340