Label-Free Electrochemical Sensor for Ochratoxin A Using a Microfabricated Electrode with Immobilized Aptamer (original) (raw)

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Smartphone biosensor for point-of-need chemiluminescence detection of ochratoxin A in wine and coffee Cover Page

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Title: Disposable and portable electrochemical aptasensor for label free detection of aflatoxin B1 in alcoholic beverages Cover Page

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Rolling Chain Amplification Based Signal-Enhanced Electrochemical Aptasensor for Ultrasensitive Detection of Ochratoxin A Cover Page

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Sensitive detection of Ochratoxin A in food and drinks using metal-enhanced fluorescence Cover Page

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An electrochemical sensor based on carboxymethylated dextran modified gold surface for ochratoxin A analysis Cover Page

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Regenerable immuno-biochip for screening ochratoxin A in green coffee extract using an automated microarray chip reader with chemiluminescence detection Cover Page

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An Electrochemical Sensor Based on Structure Switching of Dithiol-modified Aptamer for Simple Detection of Ochratoxin A Cover Page

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An electrochemical competitive biosensor for ochratoxin A based on a DNA biotinylated aptamer Cover Page

Label-Free and Redox Markers-Based Electrochemical Aptasensors for Aflatoxin M1 Detection

Sensors, 2018

We performed a comparative analysis of the sensitivity of aptamer-based biosensors for detection mycotoxin aflatoxin M1 (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 sho...

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Label-Free and Redox Markers-Based Electrochemical Aptasensors for Aflatoxin M1 Detection Cover Page

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A simple and rapid biosensor for ochratoxin A based on a structure-switching signaling aptamer Cover Page