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A Simple Colorimetric Enzymatic-Assay for Okadaic Acid Detection Based on the Immobilization of Protein Phosphatase 2A in Sol-Gel

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Abstract

Okadaic acid (OA), a lipophilic toxin, is produced by Dinophysis and Prorocentrum, and causes diarrheic shellfish poisoning to humans. The mechanism of OA action is based on the reversible inhibition of protein phosphatase type 2A (PP2A) by the toxin. Therefore, this inhibition could be used to develop assay for OA detection. In this work, a colorimetric test based on the PP2A inhibition was developed for OA detection. PP2A from GTP and Millipore was immobilized on silica sol-gel, and the detection was performed. A limit of detection of 0.29 and 1.14 μg/L was respectively observed for enzyme from GTP and Millipore. The immobilization technique provided a tool to preserve the enzymatic activity, which is very unstable in solution. The PP2A immobilized sol-gel exhibited a storage stability of near 5 months, when microtiter plate with enzyme-immobilized polymer was kept at −18C°. The combination of the simplicity of the colorimetric method, along with long storage stability achieved by sol-gel immobilization, demonstrated the potentiality of this technique to be used for commercial purpose.

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Acknowledgement

Akhtar Hayat is very grateful to the Higher Education Commission of Pakistan for financial support. This study was carried out as the part of the research project ALARMTOX, INTERREG SUDOE IVB and FEDER through the SOE1/P1/E129.

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  1. IMAGES EA 4218, Batiment S, University of Perpignan, 52 Avenue Paul Alduy, 66860, Perpignan Cedex, France

    Akhtar Hayat, Lise Barthelmebs & Jean-Louis Marty

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  1. Akhtar Hayat
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  2. Lise Barthelmebs
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  3. Jean-Louis Marty
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Correspondence to Lise Barthelmebs.

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Hayat, A., Barthelmebs, L. & Marty, JL. A Simple Colorimetric Enzymatic-Assay for Okadaic Acid Detection Based on the Immobilization of Protein Phosphatase 2A in Sol-Gel. Appl Biochem Biotechnol 166, 47–56 (2012). https://doi.org/10.1007/s12010-011-9402-0

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