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Rapid Determination of Ochratoxin A in Grape and Its Commodities Based on a Label-Free Impedimetric Aptasensor Constructed by Layer-by-Layer Self-Assembly
Open AccessArticle

Rapid and Simple Detection of Ochratoxin A using Fluorescence Resonance Energy Transfer on Lateral Flow Immunoassay (FRET-LFI)

1
Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdangawgi-ro, Buk-gu, Gwangju 61005, Korea
2
Electrical & Computer Engineering Department, University of California, Los Angeles, CA 90095, USA
3
INGIbio Co. Ltd., R&D Center, 206, APRI, 123 Cheomdangawgi-ro, Buk-gu, Gwangju 61005, Korea
*
Author to whom correspondence should be addressed.
Toxins 2019, 11(5), 292; https://doi.org/10.3390/toxins11050292
Received: 2 May 2019 / Revised: 22 May 2019 / Accepted: 23 May 2019 / Published: 23 May 2019
(This article belongs to the Special Issue Advanced Methods for Mycotoxins Detection)
The detection of mycotoxins is crucial because of their toxicity in plants, animals, and humans. It is very important to determine whether food products are contaminated with mycotoxins such as ochratoxin A (OTA), as mycotoxins can survive heat treatments and hydrolysis. In this study, we designed a fluorescence resonance energy transfer (FRET)-based system that exploits antibody-antigen binding to detect mycotoxins more rapidly and easily than other currently available methods. In addition, we were able to effectively counteract the matrix effect in the sample by using a nitrocellulose membrane that enabled fluorescence measurement in coffee samples. The developed FRET on lateral flow immunoassay (FRET-LFI) system was used to detect OTA at a limit of detection (LOD) of 0.64 ng∙mL−1, and the test can be completed in only 30 min. Moreover, OTA in coffee samples was successfully detected at a LOD of 0.88 ng∙mL−1, overcoming the matrix effect, owing to the chromatographic properties of the capillary force of the membrane. We believe that the developed system can be used as a powerful tool for the sensitive diagnosis of harmful substances such as mycotoxins and pesticides for environmental and food quality control monitoring. View Full-Text
Keywords: ochratoxin A (OTA); mycotoxin; fluorescence resonance energy transfer (FRET); lateral flow immunoassay (LFI); label-free; matrix effect ochratoxin A (OTA); mycotoxin; fluorescence resonance energy transfer (FRET); lateral flow immunoassay (LFI); label-free; matrix effect
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Oh, H.-K.; Joung, H.-A.; Jung, M.; Lee, H.; Kim, M.-G. Rapid and Simple Detection of Ochratoxin A using Fluorescence Resonance Energy Transfer on Lateral Flow Immunoassay (FRET-LFI). Toxins 2019, 11, 292.

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