Herein, we reported an efficient electrochemiluminescence
(ECL)
biosensor chip for sensitive detection of neuron-specific enolase
(NSE). First, 3,4,9,10-perylenetetracarboxylic acid with good luminescence
characteristics was used as a luminophore to obtain a stable ECL signal.
Subsequently, hollow porous Co3O4/CuO concave
polyhedron nanocages (CPNCs) were designed as co-reaction promoters
to amplify the luminescence signals for highly sensitive trace detection
of NSE. In brief, the rapid cyclic conversion of Co3+/Co2+ and Cu2+/Cu+ redox pairs could continuously
catalyze the reduction of persulfate (S2O8
2–), thus providing a large number of essential active
intermediates (SO4
•–) for ECL
emission. Meanwhile, the unique structure of Co3O4/CuO CPNCs possessed a large specific surface area, which greatly
improved its catalytic efficiency. Third, NKFRGKYKC was developed
as an affinity ligand for specific antibody fixation, which improved
incubation efficiency and protected bioactivity of antibodies. Finally,
we independently designed a microchip and applied it for ECL detection
to improve the practical application ability of the sensor. The developed
biosensor exhibited good sensitivity with a wide linear range (10
fg/mL to 100 ng/mL) and a low detection limit (3.42 fg/mL), which
played an active role in the clinical application of sensing analysis.
In
this work, based on electrochemiluminescence (ECL) technology
and self-assembled portable disease detection chips, a bioactivity-maintained
sensing platform was developed for the quantitative detection of neuron-specific
enolase. First, we prepared Fe3O4@MoS2 nanocomposites as an efficient catalyst to accelerate the reduction
of persulfate (S2O8
2–). Specifically,
abundant sulfate radicals (SO4
•–) were generated because of cyclic conversion between Fe2+ and Fe3+. Meanwhile, MoS2 nanoflowers with
a high specific surface area could not only load more Fe3O4 but also solve its agglomeration problem, which greatly
improved the catalytic efficiency. Moreover, a biosensor chip was
constructed by standard lithography processes for disease detection,
which had good sensitivity and portability. According to the above
strategies, the developed portable sensing platform played the part
of promoting the practical application of bioanalysis in early tumor
screening and clinical diagnosis. In addition, we developed a short
peptide ligand (NARKFYKG, NAR) to avoid the occupation of antigen
binding sites by specifically connecting to Fc fragments in antibodies.
Thus, the binding efficiency of antibodies and the activity of biosensors
were improved due to the introduction of NAR.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.