Amperometric immunosensor for the determination of IgA deficiency in human serum samples

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• 作者：Luis Carlos Rosales-Rivera^a ; Josep Lluis Acero-Sá ; nchez^a ; Pablo Lozano-Sá ; nchez^a ; ^{pablo.lozano@urv.cat} ; Ioanis Katakis^a ; Ciara K. O'Sullivan^a ; ^b ; ^{ciara.osullivan@urv.cat}
• 关键词：Electrochemical immunosensor ; Self assembled monolayer (SAM) ; Human IgA antibodies ; IgA deficiency ; Coeliac disease
• 刊名：Biosensors and Bioelectronics
• 出版年：2012
• 期刊代码：12_09565663
• 类别：ch
• 出版时间：15 March, 2012
• 卷：33
• 期：1
• 页码：134-138
• 文件大小：628 K

摘要

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 渭g/mL) as well as of severe IgA deficiencies (0.5-5.0 渭g/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鈥?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).