Label-Free and Redox Markers-Based Electrochemical Aptasensors for Aflatoxin M1 Detection
We performed a comparative analysis of the sensitivity of aptamer-based biosensors for detection mycotoxin aflatoxin M<sub>1</sub> (AFM1) depending on the method of immobilization of DNA aptamers and method of the detection. Label-free electrochemical impedance spectroscopy (EIS) and dif...
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doaj-b7f5658db2a54a3692c9a94af7ed64a12020-11-24T23:33:10ZengMDPI AGSensors1424-82202018-12-011812421810.3390/s18124218s18124218Label-Free and Redox Markers-Based Electrochemical Aptasensors for Aflatoxin M1 DetectionStefanos Karapetis0Dimitrios Nikolelis1Tibor Hianik2Department of Nuclear Physics and Biophysics, Comenius University, Mlynska dolina F1, 842 48 Bratislava, SlovakiaLaboratory of Environmental Chemistry, Department of Chemistry, University of Athens, Panepistimiopolis-Kouponia, 157 71 Athens, GreeceDepartment of Nuclear Physics and Biophysics, Comenius University, Mlynska dolina F1, 842 48 Bratislava, SlovakiaWe performed a comparative analysis of the sensitivity of aptamer-based biosensors for detection mycotoxin aflatoxin M<sub>1</sub> (AFM1) depending on the method of immobilization of DNA aptamers and method of the detection. Label-free electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) for ferrocene labeled neutravidin layers were used for this purpose. Amino-modified DNA aptamers have been immobilized at the surface of polyamidoamine dendrimers (PAMAM) of fourth generation (G4) or biotin-modified aptamers were immobilized at the neutravidin layer chemisorbed at gold surface. In the first case the limit of detection (LOD) has been determined as 8.47 ng/L. In the second approach the LOD was similar 8.62 ng/L, which is below of allowable limits of AFM1 in milk and milk products. The aptasensors were validated in a spiked milk samples with good recovery better than 78%. Comparative analysis of the sensitivity of immuno- and aptasensors was also performed and showed comparable sensitivity.https://www.mdpi.com/1424-8220/18/12/4218biosensorsaflatoxin M1aptasensorselectrochemical impedance spectroscopydifferential pulse voltammetry |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Stefanos Karapetis Dimitrios Nikolelis Tibor Hianik |
spellingShingle |
Stefanos Karapetis Dimitrios Nikolelis Tibor Hianik Label-Free and Redox Markers-Based Electrochemical Aptasensors for Aflatoxin M1 Detection Sensors biosensors aflatoxin M1 aptasensors electrochemical impedance spectroscopy differential pulse voltammetry |
author_facet |
Stefanos Karapetis Dimitrios Nikolelis Tibor Hianik |
author_sort |
Stefanos Karapetis |
title |
Label-Free and Redox Markers-Based Electrochemical Aptasensors for Aflatoxin M1 Detection |
title_short |
Label-Free and Redox Markers-Based Electrochemical Aptasensors for Aflatoxin M1 Detection |
title_full |
Label-Free and Redox Markers-Based Electrochemical Aptasensors for Aflatoxin M1 Detection |
title_fullStr |
Label-Free and Redox Markers-Based Electrochemical Aptasensors for Aflatoxin M1 Detection |
title_full_unstemmed |
Label-Free and Redox Markers-Based Electrochemical Aptasensors for Aflatoxin M1 Detection |
title_sort |
label-free and redox markers-based electrochemical aptasensors for aflatoxin m1 detection |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2018-12-01 |
description |
We performed a comparative analysis of the sensitivity of aptamer-based biosensors for detection mycotoxin aflatoxin M<sub>1</sub> (AFM1) depending on the method of immobilization of DNA aptamers and method of the detection. Label-free electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) for ferrocene labeled neutravidin layers were used for this purpose. Amino-modified DNA aptamers have been immobilized at the surface of polyamidoamine dendrimers (PAMAM) of fourth generation (G4) or biotin-modified aptamers were immobilized at the neutravidin layer chemisorbed at gold surface. In the first case the limit of detection (LOD) has been determined as 8.47 ng/L. In the second approach the LOD was similar 8.62 ng/L, which is below of allowable limits of AFM1 in milk and milk products. The aptasensors were validated in a spiked milk samples with good recovery better than 78%. Comparative analysis of the sensitivity of immuno- and aptasensors was also performed and showed comparable sensitivity. |
topic |
biosensors aflatoxin M1 aptasensors electrochemical impedance spectroscopy differential pulse voltammetry |
url |
https://www.mdpi.com/1424-8220/18/12/4218 |
work_keys_str_mv |
AT stefanoskarapetis labelfreeandredoxmarkersbasedelectrochemicalaptasensorsforaflatoxinm1detection AT dimitriosnikolelis labelfreeandredoxmarkersbasedelectrochemicalaptasensorsforaflatoxinm1detection AT tiborhianik labelfreeandredoxmarkersbasedelectrochemicalaptasensorsforaflatoxinm1detection |
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