Journal
TALANTA
Volume 247, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.talanta.2022.123575
Keywords
ECL immunosensor; MIL-101 (cr); Double reaction luminescence system; CA242 ultrasensitive detection
Categories
Funding
- National Natural Science Foundation of China [22078178]
- Youth Innovative Talents Attracting and Culti-vating Plan of Colleges and Universities in Shandong Province [ZR2021MB048]
- Key Research and Development Program of Shandong Province
Ask authors/readers for more resources
This study combines SnS2 quantum dots with metal-organic framework to construct an electrochemiluminescence (ECL) immunosensor with synergistic signal amplification. The constructed immunosensor shows low detection limit, high sensitivity, and stability, making it suitable for biological analysis and early disease diagnosis.
At present, the development of electrochemiluminescence (ECL) immunosensor with excellent performance is still the research focus of immunoassay and detection. Herein, SnS2 quantum dots (SnS2 QDs) and metal-organic framework (MIL-101 (Cr)) are effectively combined to achieve synergistic signal amplification based on K2S2O8 co-reactant, thereby constructing SnS2 QDs/SO4 center dot- and SO4 center dot-/O2 ECL double reaction luminous systems. SnS2 QDs and singlet oxygen (1(O2)2*) produced from the system as light-emitting devices jointly enhance the ECL response and significantly improve the sensitivity of the ECL immunosensor. Dissolved oxygen and SnS2 QDs respectively generate HOO center dot and SnS2 QDs center dot- under negative potential, and react with transient SO4 center dot- to emit strong light respectively, so as to jointly enhance the ECL response. MIL-101 catalyzes the oxygen cathode reduction reaction to promote the conversion of dissolved oxygen into HOO center dot, which greatly improves the ECL response of 1(O2)2*. CuS with spherical nanoflower-like form as a co-reaction promoter of K2S2O8 generate more SO4 center dot- active substances, which further enhance the ECL response of the immunosensor. The constructed ECL immunosensor has the advantages of low detection limit, high sensitivity and better stability. Under the optimal conditions, the detection range is 0.1 mU/mL~100 U/mL, and the detection limit is 0.015 mU/mL. The results show that the constructed ECL immunosensor can detect human CA242 samples and have a broad application prospect in biological analysis and early diagnosis of diseases.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available