Direct, label-free, and rapid transistor-based immunodetection in whole serum
Transistor-based biosensors fulfill many requirements posed upon transducers for future point-of-care diagnostic devices such as scalable fabrication and label-free and real-time quantification of chemical and biological species with high sensitivity. However, the short Debye screening length in phy...
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| Main Authors: | , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
August 30, 2017
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| In: |
ACS sensors
Year: 2017, Volume: 2, Issue: 9, Pages: 1278-1286 |
| ISSN: | 2379-3694 |
| DOI: | 10.1021/acssensors.7b00187 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/acssensors.7b00187
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| Author Notes: | Óscar Gutiérrez-Sanz, Nesha M. Andoy, Marcin S. Filipiak, Natalie Haustein, and Alexey Tarasov |
| Summary: | Transistor-based biosensors fulfill many requirements posed upon transducers for future point-of-care diagnostic devices such as scalable fabrication and label-free and real-time quantification of chemical and biological species with high sensitivity. However, the short Debye screening length in physiological samples (<1 nm) has been a major drawback so far, preventing direct measurements in serum. In this work, we demonstrate how tailoring the sensing surface with short specific biological receptors and a polymer polyethylene glycol (PEG) can strongly enhance the sensor response. In addition, the sensor performance can be dramatically improved if the measurements are performed at elevated temperatures (37 °C instead of 21 °C). With this novel approach, highly sensitive and selective detection of a representative immunosensing parameter—human thyroid-stimulating hormone—is shown over a wide measuring range with subpicomolar detection limits in whole serum. To the best of our knowledge, this is the first demonstration of direct immunodetection in whole serum using transistor-based biosensors, without the need for sample pretreatment, labeling, or washing steps. The presented sensor is low-cost, can be easily integrated into portable diagnostics devices, and offers a competitive performance compared to state-of-the-art central laboratory analyzers. |
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| Item Description: | Gesehen am 17.08.2021 |
| Physical Description: | Online Resource |
| ISSN: | 2379-3694 |
| DOI: | 10.1021/acssensors.7b00187 |