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Open AccessArticle

Self-Assembled MoS2/ssDNA Nanostructures for the Capacitive Aptasensing of Acetamiprid Insecticide

1
Université Paris-Saclay, CNRS, Institut de Chimie Moléculaire et des Matériaux d’Orsay (ICMMO), ECBB, Bât 420, 2 Rue du Doyen Georges Poitou, 91400 Orsay, France
2
Faculté des Sciences de Tunis El Manar, Laboratoire de Chimie Analytique et Electrochimie (LR99ES15), Campus Universitaire de Tunis El Manar, Université de Tunis El Manar, Tunis El–Manar 2092, Tunisia
*
Authors to whom correspondence should be addressed.
Academic Editor: Tae Hyun Kim
Appl. Sci. 2021, 11(4), 1382; https://doi.org/10.3390/app11041382
Received: 17 December 2020 / Revised: 21 January 2021 / Accepted: 26 January 2021 / Published: 3 February 2021
(This article belongs to the Special Issue Advanced Electrochemical Biosensors)
The aim of this work is to detect acetamiprid using electrochemical capacitance spectroscopy, which is widely used as a pesticide in agriculture and is harmful to humans. We have designed aptasensing platform based on the adsorption of a DNA aptamer on lipoic acid-modified MoS2 nano-sheets. The biosensor takes advantage of the high affinity of single-stranded DNA sequences to MoS2 nano-sheets. The stability of DNA on MoS2 nano-sheets is assured by covalent attachment to lipoic acid that forms self-assembled layer on MoS2 surface. The biosensor exhibits excellent capacitance performances owing to its large effective surface area making it interesting material for capacitive transduction system. The impedance-derived capacitance varies with the increasing concentrations of acetamiprid that can be attributed to the aptamer desorption from the MoS2 nanosheets facilitating ion diffusion into MoS2 interlayers. The developed device showed high analytical performances for acetamiprid detection on electrochemical impedance spectroscopy EIS- derived capacitance variation and high selectivity toward the target in presence of other pesticides. Real sample analysis of food stuff such as tomatoes is demonstrated which open the way to their use for monitoring of food contaminants by tailoring the aptamer. View Full-Text
Keywords: aptasensor; MoS2; pesticide; neonicotinoid; capacitance aptasensor; MoS2; pesticide; neonicotinoid; capacitance
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MDPI and ACS Style

Hamami, M.; Raouafi, N.; Korri-Youssoufi, H. Self-Assembled MoS2/ssDNA Nanostructures for the Capacitive Aptasensing of Acetamiprid Insecticide. Appl. Sci. 2021, 11, 1382. https://doi.org/10.3390/app11041382

AMA Style

Hamami M, Raouafi N, Korri-Youssoufi H. Self-Assembled MoS2/ssDNA Nanostructures for the Capacitive Aptasensing of Acetamiprid Insecticide. Applied Sciences. 2021; 11(4):1382. https://doi.org/10.3390/app11041382

Chicago/Turabian Style

Hamami, Maroua; Raouafi, Noureddine; Korri-Youssoufi, Hafsa. 2021. "Self-Assembled MoS2/ssDNA Nanostructures for the Capacitive Aptasensing of Acetamiprid Insecticide" Appl. Sci. 11, no. 4: 1382. https://doi.org/10.3390/app11041382

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