Title: Development and Characterization of a Piezoelectric Immunosensor for Determination of Domoic Acid in Food Samples
Citation: DEUTSCHE LEBENSMITTEL-RUNDSCHAU vol. 104 no. 11-12 p. 67-70
Publication Year: 2008
JRC N°: JRC49928
ISSN: 0012-0413
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC49928
Type: Articles in periodicals and books
Abstract: In the present study a label-free piezoelectric crystal immunosensor, based on an indirect competitive assay format, for the detection of domoic acid (DA) in shellfish is described. After physical absorption of the conjugate on the gold surface of the quartz crystals a competition step was performed by putting in contact with the crystal a solution containing the specific polyclonal antibody against domoic acid and the DA as free toxin. The build up of mass on the crystal surface, registered as a frequency decrease by the quartz crystal microbalance, can be related to the amount of free toxin in the solution in the 0-10 µg/g range. The sensor is capable to measure domoic acid at the established regulatory level (20 µg/g) after a 1:4 (v/v) dilution of the sample extract. The repeatability obtained by using three different crystals was lower than 7%. Regeneration assays have shown the possibility to reuse the modified surface by using 0.1 M NaOH as dissociation agent. The sensor could have application as screening method for compliance with European food legislation.
JRC Directorate:Institute for Health and Consumer Protection Historical Collection

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