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Year of publication
- 2014 (142) (remove)
Institute
- Fachbereich Medizintechnik und Technomathematik (42)
- Fachbereich Chemie und Biotechnologie (25)
- INB - Institut für Nano- und Biotechnologien (25)
- Fachbereich Wirtschaftswissenschaften (19)
- Fachbereich Elektrotechnik und Informationstechnik (13)
- Fachbereich Maschinenbau und Mechatronik (13)
- Fachbereich Energietechnik (12)
- IfB - Institut für Bioengineering (12)
- Fachbereich Bauingenieurwesen (4)
- Fachbereich Luft- und Raumfahrttechnik (4)
Document Type
- Article (142) (remove)
Keywords
Wu, Chunsheng ; Bronder, Thomas ; Poghossian, Arshak ; Werner, Frederik ; Bäcker, Matthias ; Schöning, Michael Josef
A multi-spot (4 × 4 spots) light-addressable potentiometric sensor (MLAPS) consisting of an Al–p-Si–SiO2 structure has been applied for the label-free electrical detection of DNA (deoxyribonucleic acid) immobilization and hybridization by the intrinsic molecular charge for the first time. Single-stranded probe ssDNA molecules (20 bases) were covalently immobilized onto the silanized SiO2 gate surface. The unspecific adsorption of mismatch ssDNA on the MLAPS gate surface was blocked by bovine serum albumin molecules. To reduce the screening effect and to achieve a high sensor signal, the measurements were performed in a low ionic-strength solution. The photocurrent–voltage (I–V) curves were simultaneously recorded on all 16 spots after each surface functionalization step. Large shifts of I–V curves of 25 mV were registered after the DNA immobilization and hybridization event. In contrast, a small potential shift (∼5 mV) was observed in case of mismatch ssDNA, revealing good specificity of the sensor. The obtained results demonstrate the potential of the MLAPS as promising transducer platform for the multi-spot label-free electrical detection of DNA molecules by their intrinsic molecular charge.