Sensor specificity. ME sensor responses to a mixed solution of rabbit IgG produced in sheep and mouse IgG produced in goat. The black line represents the response of the sensing ribbon in each of the following steps: (I) functionalization with a solution of 25 µg∙mL−1 of UV-activated antibodies, (II) rinse with MilliQ water, (III) flowing of bovine serum albumin solution (50 μg∙mL−1), (IV) flowing of Rabbit IgG produced in sheep and Mouse IgG produced in goat solution both at a concentration of 20 μg mL−1, (V) rinse with MilliQ water, (VI) amplification with core-shell NPs (Fe3O4@Au NPs), (VII) rinse with MilliQ water.