NDLI: Cascade-Enhanced Lateral Flow Immunoassay for Sensitive Detection of Okadaic Acid in Seawater, Fish, and Seafood

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Cascade-Enhanced Lateral Flow Immunoassay for Sensitive Detection of Okadaic Acid in Seawater, Fish, and Seafood

Content Provider	MDPI
Author	Hendrickson, Olga D. Zvereva, Elena A. Zherdev, Anatoly V. Dzantiev, Boris B.
Copyright Year	2022
Description	In this investigation, a new approach for developing a sensitive lateral flow immunoassay (LFIA) was proposed for the detection of the hazardous marine toxin okadaic acid (OA). It is based on the indirect format with anti-species antibodies labeled by gold nanoparticles (AuNPs) and cascade signal amplification. The latter is performed by first passing a mixture of anti-OA antibodies and a tested sample along the immunochromatographic test strip and then performing several cycles of the interaction of anti-species antibodies conjugated with AuNPs with free antibodies, which bind to anti-species antibodies but are not specific to the target analyte. As a result, branched aggregates are formed, due to which the colorimetric signal intensification occurs. The developed test system enabled the detection of OA with an instrumental detection limit of 30 pg/mL and a cutoff of 1 ng/mL, which exceeds these characteristics in the LFIA without amplification by 7 and 2 times, respectively. The OA recoveries from seawater, fish, and seafood varied from 76.9% to 126%. The test system may be required for point-of-care monitoring of samples for phycotoxin contamination; the developed principle of signal amplification can be used in cases where highly sensitive detection of trace amounts of a contaminant is required.
Starting Page	1691
e-ISSN	23048158
DOI	10.3390/foods11121691
Journal	Foods
Issue Number	12
Volume Number	11
Language	English
Publisher	MDPI
Publisher Date	2022-06-09
Access Restriction	Open
Subject Keyword	Foods Analytical Chemistry Microbiology Phycotoxins Okadaic Acid Lateral Flow Immunoassay Signal Amplification Seawater Seafood
Content Type	Text
Resource Type	Article

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