López Ruiz, María BeatrizArévalo Pérez, BeatrizSerafín González-Carrato, VerónicaSánchez-Paniagua López, MartaMontero Calle, AnaBarderas Manchado, RodrigoCampuzano Ruiz, SusanaYáñez-Sedeño Orive, PalomaPingarrón Carrazón, José Manuel2024-02-072024-02-072020-07Arévalo B, Serafín V, Sánchez-Paniagua M, Montero-Calle A, Barderas R, López-Ruíz B, et al. Fast and sensitive diagnosis of autoimmune disorders through amperometric biosensing of serum anti-dsDNA autoantibodies. Biosensors and Bioelectronics 2020;160:112233. https://doi.org/10.1016/j.bios.2020.112233.0956-566310.1016/j.bios.2020.112233https://hdl.handle.net/20.500.14352/99942This work reports the first amperometric biosensor involving the use of neutravidin-functionalized magnetic microbeads (NA-MBs) modified with a biotinylated-anti-dsDNA (b-dsDNA) as efficient magnetic microcarriers to selectively capture anti-dsDNA autoantibodies (IgG, IgA and IgM AAbs) present in the sera of patients with rheumatoid arthritis (RA). Subsequently, the attached anti-dsDNA AAbs are detected with a mixture of conventional HRP-labeled secondary antibodies (HRP-anti-human IgG/IgM/IgA mixture). The biorecognition event is monitored by amperometric transduction using the hydroquinone (HQ)/H2O2 system upon capturing the modified MBs on the surface of screen-printed carbon electrodes (SPCEs). The developed bioplatform exhibits a linear calibration plot ranging from 1 to 200 IU mL−1 with a LOD of 0.3 IU mL−1 for anti-dsDNA AAbs standards. In addition, the biosensor allows performing the determination of the anti-dsDNA AAbs levels directly in 100-times diluted serum samples from patients diagnosed with RA and in just 75 min. The obtained results are in agreement with those provided by an ELISA kit and allow discrimination between positive and negative samples.engFast and sensitive diagnosis of autoimmune disorders through amperometric biosensing of serum anti-dsDNA autoantibodiesjournal articlehttps://doi.org/10.1016/j.bios.2020.112233restricted access543Rheumatoid arthritisElectrochemical biosensorAnti-dsDNA autoantibodiesMagnetic microbeadsScreen-printed carbon electrodesQuímica analítica (Química)2301 Química Analítica