title: An indirect competitive immunoassay for insulin autoantibodies based on surface plasmon resonance.
abstract: We have developed a sensitive and specific method based on surface plasmon resonance (SPR) for detection of insulin autoantibodies (IAA) in serum samples from individuals at high risk of developing type 1 diabetes (T1D). When measuring trace molecules in undiluted sera with label-free techniques like SPR, non-specific adsorption of matrix proteins to the sensor surface is often a problem, since it causes a signal that masks the analyte response. The developed method is an indirect competitive immunoassay designed to overcome these problems. Today, IAA is mainly measured in radio immunoassays (RIAs), which are time consuming and require radioactively labeled antigen. With our SPR-based immunoassay the overall assay time is reduced by a factor of >100 (4 days to 50min), while sensitivity is maintained at a level comparable to that offered by RIA.
authors: Division of Sensor Science and Molecular Physics, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden.
authors: Jenny
authors: J
authors: Carlsson
authors: Camilla
authors: C
authors: Gullstrand
authors: Gunilla T
authors: GT
authors: Westermark
authors: Johnny
authors: J
authors: Ludvigsson
authors: Karin
authors: K
authors: Enander
authors: Bo
authors: B
authors: Liedberg
mesh_terms: D001323:Autoantibodies / Q000032:analysis*; D015374:Biosensing Techniques / Q000295:instrumentation* / Q000379:methods; D002648:Child; D003922:Diabetes Mellitus, Type 1 / Q000276:immunology*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D007118:Immunoassay / Q000295:instrumentation*; D007328:Insulin / Q000276:immunology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
chemical_list: D001323:Autoantibodies; D007328:Insulin