Pérez-Mitta, Gonzalo ; Peinetti, Ana S. ; Cortez, M. Lorena ; Toimil-Molares, María Eugenia ; Trautmann, Christina ; Azzaroni, Omar (2018)
Highly sensitive biosensing with solid-state nanopores displaying enzymatically reconfigurable rectification properties.
In: Nano Letters, 18 (5)
doi: 10.1021/acs.nanolett.8b01281
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Molecular design of biosensors based on enzymatic processes taking place in nanofluidic elements is receiving increasing attention by the scientific community. In this work, we describe the construction of novel ultrasensitive enzymatic nanopore biosensors employing "reactive signal amplifiers" as key elements coupled to the transduction mechanism. The proposed framework offers innovative design concepts not only to amplify the detected ionic signal and develop ultrasensitive nanopore-based sensors but also to construct nanofluidic diodes displaying specific chemo-reversible rectification properties. The integrated approach is demonstrated by electrostatically assembling poly(allylamine) on the anionic pore walls followed by the assembly of urease. We show that the cationic weak polyelectrolyte acts as a "reactive signal amplifier" in the presence of local pH changes induced by the enzymatic reaction. These bioinduced variations in proton concentration ultimately alter the protonation degree of the polyamine resulting in amplifiable, controlled, and reproducible changes in the surface charge of the pore walls, and consequently on the generated ionic signals. The "iontronic" response of the as-obtained devices is fully reversible, and nanopores are reused and assayed with different urea concentrations, thus ensuring reliable design. The limit of detection (LOD) was 1 nM. To the best of our knowledge, this value is the lowest LOD reported to date for enzymatic urea detection. In this context, we envision that this approach based on the use of "reactive signal amplifiers" into solid-state nanochannels will provide new alternatives for the molecular design of highly sensitive nanopore biosensors as well as (bio)chemically addressable nanofluidic elements.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2018 |
| Autor(en): | Pérez-Mitta, Gonzalo ; Peinetti, Ana S. ; Cortez, M. Lorena ; Toimil-Molares, María Eugenia ; Trautmann, Christina ; Azzaroni, Omar |
| Art des Eintrags: | Bibliographie |
| Titel: | Highly sensitive biosensing with solid-state nanopores displaying enzymatically reconfigurable rectification properties |
| Sprache: | Englisch |
| Publikationsjahr: | Mai 2018 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Nano Letters |
| Jahrgang/Volume einer Zeitschrift: | 18 |
| (Heft-)Nummer: | 5 |
| DOI: | 10.1021/acs.nanolett.8b01281 |
| Kurzbeschreibung (Abstract): | Molecular design of biosensors based on enzymatic processes taking place in nanofluidic elements is receiving increasing attention by the scientific community. In this work, we describe the construction of novel ultrasensitive enzymatic nanopore biosensors employing "reactive signal amplifiers" as key elements coupled to the transduction mechanism. The proposed framework offers innovative design concepts not only to amplify the detected ionic signal and develop ultrasensitive nanopore-based sensors but also to construct nanofluidic diodes displaying specific chemo-reversible rectification properties. The integrated approach is demonstrated by electrostatically assembling poly(allylamine) on the anionic pore walls followed by the assembly of urease. We show that the cationic weak polyelectrolyte acts as a "reactive signal amplifier" in the presence of local pH changes induced by the enzymatic reaction. These bioinduced variations in proton concentration ultimately alter the protonation degree of the polyamine resulting in amplifiable, controlled, and reproducible changes in the surface charge of the pore walls, and consequently on the generated ionic signals. The "iontronic" response of the as-obtained devices is fully reversible, and nanopores are reused and assayed with different urea concentrations, thus ensuring reliable design. The limit of detection (LOD) was 1 nM. To the best of our knowledge, this value is the lowest LOD reported to date for enzymatic urea detection. In this context, we envision that this approach based on the use of "reactive signal amplifiers" into solid-state nanochannels will provide new alternatives for the molecular design of highly sensitive nanopore biosensors as well as (bio)chemically addressable nanofluidic elements. |
| Freie Schlagworte: | Solid-state nanopores, nanofluidic devices, nanochannels, biosensing, urea sensing |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Ionenstrahlmodifizierte Materialien |
| Hinterlegungsdatum: | 29 Feb 2024 11:20 |
| Letzte Änderung: | 29 Feb 2024 11:20 |
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