期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 2, 页码 3295-3302出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c14946
关键词
metal-organic framework; MOF-808; biosensor; cancer diagnosis; immobilization; streptavidin
资金
- Jiangsu Postdoc Foundation of China [217744]
- Yangzhou University Postdoc Fund [007124]
A high-performance nanocomposite of Zr-trimesic acid MOF (MOF-808) with carbon nanotube (CNT) was synthesized through in situ formation on activated CNT, showing excellent electrochemical properties and selectivity for ultra-low-level ovarian cancer biomarker detection.
In this work, a nanocomposite of Zr-trimesic acid MOF (MOF-808) with carbon nanotube (CNT) was synthesized through an in situ formation of MOF-808 on the activated CNT. The synthesized materials were characterized by powder X-ray diffraction, transmission electron microscopy, X-ray photoluminescence spectroscopy, Brunauer-Emmett-Teller, Fourier transform infrared spectroscopy, and Raman spectroscopy. The protein compatible nature with high surface area and electrocatalytic ability of MOF-808 was utilized to construct an immunosensor for ultra low-level detection of the ovarian cancer biomarker, carbohydrate antigen 125 (CA 125). The mutual benefit of each constituent of the MOF-808/CNT composite was capable of producing highly enhanced electrochemical properties. A glassy carbon electrode modified with MOF-808/CNT was used as a platform to fabricate a label-free electrochemical immunosensor. The antibody binding sites of MOF-808/CNT were enriched by functionalization with streptavidin. The immunosensor exhibited two linear determination ranges of 0.001-0.1 and 0.1-30 ng.mL(-1), and the calculated limit of detection was 0.5 pg.mL(-1) (S/N 3). The immunosensor showed excellent reproducibility and selectivity. The patient serum sample analysis was cross-verified with the electrochemiluminescence method with a relative error of 105-110%.
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