Aggregation-Induced Electrochemiluminescence Based on a Zinc-Based Metal–Organic Framework and a Double Quencher Au@UiO-66-NH<sub>2</sub> for the Sensitive Detection of Amyloid β 42 <i>via</i> Resonance Energy Transfer
Juan Yang, Dongmiao Qin, Na Wang, Yu‐Sheng Wu, Kanjun Fang, Biyang Deng
Abstract
A novel sandwich electrochemiluminescence (ECL) biosensor based on aggregation-induced electrochemiluminescence resonance energy transfer (AIECL-RET) was designed for the sensitive detection of amyloid β42 (Aβ42). The synthesized silver nanoparticle-functionalized zinc metal–organic framework (Ag@ZnPTC) and gold nanoparticle-functionalized zirconium organic framework (Au@UiO-66-NH 2 ) were used as the ECL donor and acceptor, respectively. AgNPs were generated in situ on the surface of ZnPTC, which further improved the ECL intensity and the loading of antibody 1 (Ab1). Under the optimized experimental conditions, the linear detection range of Aβ42 concentration was 10 fg/mL to 100 ng/mL, and the detection limit was 2.4 fg/mL (S/N = 3). The recoveries of Aβ42 were 99.5–104%. The method has good stability, repeatability, and specificity. Ag@ZnPTC/Au@UiO-66-NH 2 provides an assay for the sensitive detection of disease biomarkers.