Amperometric immunosensor for the determination of IgA deficiency in human serum samples.
An electrochemical immunosensor for the detection of human IgA deficiency in real human blood serum has been developed. The performance of the immunosensor presents a large but sensitive dynamic range that allows the determination of non-deficient IgA levels (>70 μg/mL) as well as of severe IgA deficiencies (0.5-5.0 μg/mL). The assay architecture involves the immobilisation of a coating antibody on an electrode surface using carboxylic-ended bipodal alkane-thiol self-assembled monolayers (SAMs). The long chain bipodal SAM presents intercalated poly(ethylenglycol) groups that confer the immunosensor the ability to retain its optimum performance in very complex matrices and serum with negligible non-specific adsorption phenomena. Amperometric optimisation of the assay resulted in limits of detection of 142 ng/mL in just 30 min total assay time. Real patients' serum samples were analysed using the developed electrochemical immunosensor demonstrating an excellent correlation in terms of sensitivity and reproducibility compared with standard enzyme linked immunosorbent assays (ELISA).
Department d'Enginyeria Quimica, Universitat Rovira i Virgili, Avinguda Països Catalans 26, 43007 Tarragona, Spain.
Luis Carlos
LC
Rosales-Rivera
Josep Lluis
JL
Acero-Sánchez
Pablo
P
Lozano-Sánchez
Ioanis
I
Katakis
Ciara K
CK
O'Sullivan
D015374:Biosensing Techniques / Q000379:methods*; D055664:Electrochemical Techniques / Q000379:methods*; D006801:Humans; D017098:IgA Deficiency / Q000175:diagnosis*; D007118:Immunoassay / Q000379:methods*; D007070:Immunoglobulin A / Q000097:blood*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity
D007070:Immunoglobulin A