Intramolecular Coreaction Accelerated Electrochemiluminescence of Polypeptide-Biomineralized Gold Nanoclusters for Targeted Detection of Biomarkers.

Abstract

The development of label-free electrochemiluminescence (ECL)-based sensing technology for biomarkers detection has a congenital defect compared to noncompetitive sandwich-type biosensors due to the lack of detection antibody conjugated with a signal label. Nevertheless, it is still not difficult to realize the ultrasensitive analysis benefit from the exploration of efficient sensing substrates and signal transducers. In this work, an innovative sensing system is purposed utilizing Fe2O3 nanoarrays (Fe2O3 NAs) as a well-ordered coreaction accelerator and polypeptide-biomineralized gold nanoclusters (Au NCs) as a signal transducer. Bifunctional peptide ligands of H2N-MMYYHFRRHL-COOH (MYH-10) are self-designed; it cannot only play a role of reductant and coupling reagent for cluster formation using the MMYY sequence root in the N-terminal but also act as a connection for coupling carriers and immune molecules via the HFRRHL region of the C-terminal. In addition to intramolecular ECL emission between Au NCs and tris(3-aminoethyl)amine (TAEA), all strategies undoubtedly reduce the spatial hindrance of the sensing interface and increase the effectiveness of the electron transfer and immune recognition. With CYFRA21-1 as a target, the biosensor exhibits a linear ECL response in a wide range (10 fg mL-1 to ∼100 ng mL-1) and an ultralow detection limit of 1.33 fg mL-1 (S/N = 3). With convincing experimental data, these innovative strategies will be more eye-catching in peptide-based nanocluster synthesis and expansion of a more novel thought for sensing platform fabrication.

• Authors: Yue Jia, Shanghua Liu, Yu Du, Lei Yang, Xuejing Liu, Lei Liu, Xiang Ren, Qin Wei, Huangxian Ju
• Journal: Analytical chemistry (Anal Chem) Vol. 92 Issue 13 Pg. 9179-9187 (07 07 2020) ISSN: 1520-6882 [Electronic] United States
• PMID: 32519540 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antigens, Neoplasm
• Biomarkers
• Keratin-19
• Peptides
• antigen CYFRA21.1
• Gold
• Ferrosoferric Oxide

Topics

• Amino Acid Sequence
• Antigens, Neoplasm (analysis)
• Biomarkers (analysis)
• Biosensing Techniques (methods)
• Electrochemical Techniques
• Ferrosoferric Oxide (chemistry)
• Gold (chemistry)
• Humans
• Keratin-19 (analysis)
• Limit of Detection
• Luminescent Measurements (methods)
• Metal Nanoparticles (chemistry)
• Microarray Analysis
• Peptides (chemistry)
• Reproducibility of Results
• Urinary Bladder Neoplasms (diagnosis)