Citation: Huan Zhao, Enben Su, Li Huang, Yunfeng Zai, Yuan Liu, Zhu Chen, Song Li, Lian Jin, Yan Deng, Nongyue He. Washing-free chemiluminescence immunoassay for rapid detection of cardiac troponin I in whole blood samples[J]. Chinese Chemical Letters, ;2022, 33(2): 743-746. doi: 10.1016/j.cclet.2021.07.017 shu

Washing-free chemiluminescence immunoassay for rapid detection of cardiac troponin I in whole blood samples

Huan Zhao ^{a, b} ,
Enben Su ^{a, b, *} ,
Li Huang ^{a, b} ,
Yunfeng Zai ^{a, b} ,
Yuan Liu ^a ,
Zhu Chen ^c ,
Song Li ^c ,
Lian Jin ^{a, c, *} ,
Yan Deng ^{c, *} ,
Nongyue He ^{a, c, *}

a.
State Key Laboratory of Bioelectronics, National Demonstration Center for Experimental Biomedical Engineering Education, School of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
b.
Getein Biotechnology Co., Ltd., Nanjing 210000, China
c.
Hunan Key Laboratory of Biomedical Nanomaterials and Devices, Hunan University of Technology, Zhuzhou 412007, China

Received Date: 25 May 2021
Revised Date: 5 July 2021
Accepted Date: 7 July 2021
Available Online: 13 July 2021

Figures(4)

Chemiluminescence immunoassay (CLIA) has always been a great challenge in detecting cardiac troponin I (cTnI) in whole blood samples without centrifugation because of the interference of red blood cells and low sensitivity. In this study, the antigens and erythrocytes in the blood were captured by the antibodies immobilized on the magnetic particles, recognized by another biotin-conjugated cTnI antibody and detected by streptavidin/acridine aster-conjugated polychloromethylstyrene microspheres (PCMS). After magnetic separation, the supernatant was transferred and measured. No significant difference was noted between the cTnI concentrations of the serum samples, plasma samples and whole blood. The prepared PCMS provided more functional areas to conjugate streptavidin and acridinium ester, so the immunoassay has highly sensitive, the limits of blank at 0.012 ng/mL, and functional sensitivity at 0.019 ng/mL with a CV of 20%, and 0.058 ng/mL with a CV of 10%. Total precision of any sample type ranged from 2.62%~5.67%. The assay was linear over the studied range of 0.01-50.00 ng/mL, and no hook effect was found when cTnI concentrations reached 1900 ng/mL. No significant interference was noted with the potential endogenous interfering substances. Compared with the commercial kit (Abbott assay kit), the correlation coefficient was 0.9859. A washing-free CLIA was established for the rapid detection of cTnI in human whole blood, using erythrocyte capture antibodies-conjugated magnetic nanoparticles for eliminating the influence of erythrocytes and PCMS for signal amplification, which showed great potential in clinical application.
- Washing-free,
- Whole blood,
- Chemiluminescence immunoassay,
- Polychloromethylstyrene microspheres
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