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Development of a novel label-free amperometric immunosensor for the detection of okadaic acid
- Hayat, Akhtar, Barthelmebs, Lise, Sassolas, Audrey, Marty, Jean-Louis
- Analytica chimica acta 2012 v.724 pp. 92-97
- Dinophyceae, colorimetry, detection limit, electrochemistry, electrodes, gold, immunosensors, monoclonal antibodies, okadaic acid
- Okadaic acid (OA), a lipophilic phycotoxin is mainly produced by toxigenic dinoflagellates. The need to develop high performing methods for OA analysis able to improve the traditional ones is evident. In this work, a novel experimental methodology for label-free detection of OA was developed. Protein G magnetic beads (protein-G-MBs) modified gold electrode was used to immobilize anti-OA monoclonal antibody (anti-OA-MAb). Preliminary, colorimetric tests were performed in order to validate protein-G-MBs and anti-OA-MAb reaction. Electrochemical detection was carried out by differential pulse voltammetry in ferri/ferrocyanide solution. The limit of detection value obtained (0.5μgL⁻¹) validated the developed electrochemical immunosensor as a promising tool for routine use. The matrix effect and the recovery rate were also assessed with real samples, showing a good percentage of recovery.