An electrochemiluminescence immunosensor based on ABEI and FCA functionalized Platinum@Copper hierarchical trigonal bipyramid nanoframes

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• 作者：Huiyun Yang ; Haijun Wang ; Chengyi Xiong ; Yuting Liu ; Ruo Yuan ; ^{yuanruo@swu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Yaqin Chai ; ^{yqchai@swu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：N-(aminobutyl)-N-(ethylisoluminol) ; ferrocenecarboxylic acid ; mucin-1 ; electrochemiluminescence ; immunosensor
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：20 September 2016
• 年：2016
• 卷：213
• 期：Complete
• 页码：512-519
• 全文大小：2128 K

文摘

In this work, an electrochemiluminescence (ECL) immunosensor for ultrasensitive detection of mucin-1 (MUC1) was designed with N-(aminobutyl)-N-(ethylisoluminol) (ABEI) and host-guest inclusion functionalized Platinum@Copperhierarchicaltrigonalbipyramidnanoframes(Pt@Cu HNFs) as signal label. At First, Pt@Cu HNFs were prepared to load abundant amine-modified β-cyclodextrin (β-CD) and luminophore ABEI via Pt-N bond. Based on the effect of host-guest recognition, ferrocenecarboxylic acid (FCA) as a catalyst of ABEI-H₂O₂ system was linked on the cavity of amine-modified β-CD to form nanocomposite of Pt@Cu HNFs-ABEI-(β-CD-FCA). Both Pt@Cu HNFs and FCA could catalyze H₂O₂ decomposition, which significantly enhanced the ECL intensity of ABEI-H₂O₂ system. Forthermore, simultaneously immobilizing ABEI and its catalyst FCA on Pt@Cu HNFs with good electrical conductivity could greatly increase the electron transfer efficiency in the ECL reaction, leading to a further signal amplification. Then, due to its good biocompatibility, large specific surface area and high luminous efficiency, the obtained Pt@Cu HNFs-ABEI-(β-CD-FCA) could act as an ideal nanocarrier of detection antibody (Ab₂). As a result, a desirable “signal-on” ECL immunosensor was proposed for the detection of MUC1 with a wide linear range from 1 × 10⁻⁵ ng mL⁻¹ to 10 ng mL⁻¹ and a relatively low detection limit of 3.3 fg mL⁻¹ (S N⁻¹ = 3), making this approach hold great potential for protein analysis.