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Label-free histamine detection with nanofluidic diodes through metal ion displacement mechanism

Ali, Mubarak and Ramirez, Patricio and Duznovic, Ivana and Nasir, Saima and Mafe, Salvador and Ensinger, Wolfgang :
Label-free histamine detection with nanofluidic diodes through metal ion displacement mechanism.
[Online-Edition: https://doi.org/10.1016/j.colsurfb.2016.11.038]
In: Colloids and Surfaces B: Biointerfaces, 150 pp. 201-208. ISSN 09277765
[Article] , (2017)

Official URL: https://doi.org/10.1016/j.colsurfb.2016.11.038

Abstract

We design and characterize a nanofluidic device for the label-free specific detection of histamine neurotransmitter based on a metal ion displacement mechanism. The sensor consists of an asymmetric polymer nanopore fabricated via ion track-etching technique. The nanopore sensor surface having metal–nitrilotriacetic (NTA–Ni2+) chelates is obtained by covalent coupling of native carboxylic acid groups with Nα,Nα-bis(carboxymethyl)-l-lysine (BCML), followed by exposure to Ni2+ ion solution. The BCML immobilization and subsequent Ni2+ ion complexation with NTA moieties change the surface charge concentration, which has a significant impact on the current–voltage (I–V) curve after chemical modification of the nanopore. The sensing mechanism is based on the displacement of the metal ion from the NTA–Ni2+ chelates. When the modified pore is exposed to histamine solution, the Ni2+ ion in NTA–Ni2+ chelate recognizes histamine through a metal ion coordination displacement process and formation of stable Ni-histamine complexes, leading to the regeneration of metal-free NTA groups on the pore surface, as shown in the current-voltage characteristics. Nanomolar concentrations of the histamine in the working electrolyte can be detected. On the contrary, other neurotransmitters such as glycine, serotonin, gamma-aminobutyric acid, and dopamine do not provoke significant changes in the nanopore electronic signal due to their inability to displace the metal ion and form a stable complex with Ni2+ ion. The nanofluidic sensor exhibits high sensitivity, specificity and reusability towards histamine detection and can then be used to monitor the concentration of biological important neurotransmitters.

Item Type: Article
Erschienen: 2017
Creators: Ali, Mubarak and Ramirez, Patricio and Duznovic, Ivana and Nasir, Saima and Mafe, Salvador and Ensinger, Wolfgang
Title: Label-free histamine detection with nanofluidic diodes through metal ion displacement mechanism
Language: English
Abstract:

We design and characterize a nanofluidic device for the label-free specific detection of histamine neurotransmitter based on a metal ion displacement mechanism. The sensor consists of an asymmetric polymer nanopore fabricated via ion track-etching technique. The nanopore sensor surface having metal–nitrilotriacetic (NTA–Ni2+) chelates is obtained by covalent coupling of native carboxylic acid groups with Nα,Nα-bis(carboxymethyl)-l-lysine (BCML), followed by exposure to Ni2+ ion solution. The BCML immobilization and subsequent Ni2+ ion complexation with NTA moieties change the surface charge concentration, which has a significant impact on the current–voltage (I–V) curve after chemical modification of the nanopore. The sensing mechanism is based on the displacement of the metal ion from the NTA–Ni2+ chelates. When the modified pore is exposed to histamine solution, the Ni2+ ion in NTA–Ni2+ chelate recognizes histamine through a metal ion coordination displacement process and formation of stable Ni-histamine complexes, leading to the regeneration of metal-free NTA groups on the pore surface, as shown in the current-voltage characteristics. Nanomolar concentrations of the histamine in the working electrolyte can be detected. On the contrary, other neurotransmitters such as glycine, serotonin, gamma-aminobutyric acid, and dopamine do not provoke significant changes in the nanopore electronic signal due to their inability to displace the metal ion and form a stable complex with Ni2+ ion. The nanofluidic sensor exhibits high sensitivity, specificity and reusability towards histamine detection and can then be used to monitor the concentration of biological important neurotransmitters.

Journal or Publication Title: Colloids and Surfaces B: Biointerfaces
Volume: 150
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Neurotransmitter, Histamine, Surface functionalization, Nanofluidic sensor, NTA-metal complex
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Material Analytics
Date Deposited: 11 Jul 2017 12:02
DOI: 10.1016/j.colsurfb.2016.11.038
Official URL: https://doi.org/10.1016/j.colsurfb.2016.11.038
Funders: M.A., I.D., S.N. and W.E. acknowledge the funding from the Hessen State Ministry of Higher Education, Research and the Arts, Germany, under the LOEWE project iNAPO., P. R. and S. M. acknowledge financial support by the Spanish Ministry of Economic Affairs and Competitiveness (MAT2015-65011-P) and FEDER.
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