Dual-Wavelength
Electrochemiluminescence Ratiometric
Biosensor for NF-κB p50 Detection with Dimethylthiodiaminoterephthalate
Fluorophore and Self-Assembled DNA Tetrahedron Nanostructures Probe
posted on 2020-02-28, 21:29authored byZhenqiang Fan, Zongqiong Lin, Zepeng Wang, Jianfeng Wang, Minhao Xie, Jianfeng Zhao, Kai Zhang, Wei Huang
In
this work, we fabricated a dual-wavelength electrochemiluminescence
ratiometric biosensor based on electrochemiluminescent resonance energy
transfer (ECL-RET). In this biosensor, Au nanoparticle-loaded graphitic
phase carbon nitride (Au-g-C3N4) as a donor
and Au-modified dimethylthiodiaminoterephthalate (TAT) analogue (Au@TAT)
as an acceptor were investigated for the first time. Besides, tetrahedron
DNA probe was immobilized onto Au-g-C3N4 to
improve the binding efficiency of the transcription factor and ECL
ratiometric changes on the basis of the ratio of ECL intensities at
595 and 460 nm, which were obtained through the formation of a sandwich
structure of DNA probe–antigen–antibody. Our biosensor
achieved the assay of NF-κB p50 with a detection limit of 5.8
pM as well as high stability and specificity.