Enhanced Chemiluminescence under the Nanoconfinement of Covalent–Organic Frameworks and Its Application in Sensitive Detection of Cancer Biomarkers

Release time:2023-07-01  Hits:

• DOI number:10.1021/acs.analchem.3c00372
• Journal:Anal. Chem.
• Abstract:Chemiluminescence (CL) with intensive emission has been pursued for decades. It is still challenging to find a new mechanism to enhance CL. In this work, confinement-enhanced CL was developed for the first time by the coembedding of N-(aminobutyl)-N-(ethylisoluminol) (ABEI) and Co2+ into gold nanoparticle-modified covalent–organic frameworks (COFs). For the consideration of improving the hydrophilicity of COFs and facilitating subsequent biological modification, gold nanoparticles were first reduced on the COF surface (Au-COF) in situ without other reducing reagents. By virtue of the abundant imine bond and π backbones, ABEI and Co2+ were embedded in Au-COF synergistically through π–π stacking and coordination. The confinement of ABEI and Co2+ into Au-COF brought an over 20-fold enhancement of CL intensity compared to that of adding them to a liquid phase, which benefitted from the three aspects of the confinement effect, including the molecular enrichment effect, the physical constraint effect, and the molecular preorganization effect. As proof of concept, a lipid–protein dual-recognition sandwich strategy based on this CL-functionalized COF was developed for the detection of breast cancer cell line-derived extracellular vesicles (EVs) with four orders of magnitude improvement in the detection limit compared to ELISA. The successful distinction of human epidermal growth factor receptor 2 (HER2)-positive patients from HER2-negative patients indicated the great application potential of the proposed bioassay in HER2-positive breast cancer diagnosis. This work proposed a novel enhancement mechanism for CL based on crystalline porous materials, which provides a new perspective for the development of CL-functionalized materials for biosensors and bioassays.
• Co-author:王依莎
• First Author:吕爱华
• Indexed by:Journal paper
• Correspondence Author:Hua Cui
• Discipline:Natural Science
• Document Type:J
• Volume:95
• Issue:20
• Page Number:7914–7923
• Translation or Not:no
• Date of Publication:2023-05-11
• Included Journals:SCI
• Links to published journals:https://pubs.acs.org/doi/10.1021/acs.analchem.3c00372