%0 Journal Article
%A Ruiz Valdepeñas Montiel, Víctor
%A Campuzano Ruiz, Susana
%A Conzuelo, Felipe
%A Torrente Rodríguez, Rebeca Magnolia
%A Gamella Carballo, María
%A Reviejo García, Ángel Julio
%A Pingarrón Carrazón, José Manuel
%T Electrochemical magnetoimmunosensing platform for determination of the milk allergen β-lactoglobulin
%D 2015
%@ 0039-9140
%U https://hdl.handle.net/20.500.14352/95450
%X A very sensitive magnetoimmunosensor for the determination of β-lactoglobulin (β-LG) is reported in this work. A sandwich configuration involving covalent immobilization of the capture antibody (antiβ-LG) onto activated carboxylic-modified magnetic beads (HOOC-MBs) and incubation of the modified MBs with a horseradish peroxidase labeled antibody (HRP-antiβ-LG), is used. The resulting modified MBs are captured by a magnet placed under the surface of a disposable carbon screen-printed electrode (SPCE) and the amperometric responses are measured at −0.20 V (vs. Ag pseudo-reference electrode), upon addition of hydroquinone (HQ) as electron transfer mediator and hydrogen peroxide as the enzyme substrate. The β-LG magnetoimmunosensor exhibited a wide range of linearity (2.8–100 ng/mL) and a low detection limit of 0.8 ng/mL (20 pg in 25 μL sample). The magnetoimmunosensing platform was successfully applied for the detection of β-LG in different types of milk without any matrix effect after just a sample dilution. The results correlated properly with those provided by a commercial ELISA method offering a truthful analytical screening tool. These features make the developed methodology a promising alternative in the development of user-friendly devices for on-site determination of β-LG in dairy products.
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