期刊
ANALYTICAL CHEMISTRY
卷 94, 期 36, 页码 12368-12373出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.2c01478
关键词
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资金
- National Natural Science Foundation of Shandong Province [ZR2021QB120, ZR201911110108, ZR2020QB072]
- Special Foundation for Taishan Scholar Professorship of Shandong Province [ts201712052]
This work proposes an antigen-down photoelectrochemical immunosensor based on a signal polarity switching strategy for the detection of CYFRA21-1. The immunosensor exhibits high sensitivity, good stability, high selectivity, and good repeatability.
In this work an antigen-down photoelectrochemical (PEC) immunosensor based on a signal polarity switching strategy for the detection of cytokeratin 19 fragment 21-1 (CYFRA21-1) was proposed. 3,4,9,10-Perylene tetracarboxylic acid (PTCA) is a conjugated organic dye containing five benzene nuclei, which has excellent film-forming and optical properties. PTCA sensitized by SnS2 can further improve the basal signal and the stability of the PEC immunosensor. Moreover, avidin-functionalized CuInS2 as a signal probe can convert the basal anodic photocurrent to a cathodic photocurrent. Therefore, the PEC sensor realized the photocurrent polarity conversion before and after labeling. With avidin-functionalized CuInS2, the polarity of the photocurrent was changed once CYFRA21-1 was detected. Therefore, the PEC immunosensor owns high sensitivity. The linear range of the immunosensor for the detection of CYFRA21-1 is 0.00001-500 ng.mL(-1), and the detection limit is 3.5 fg.mL(-1). The PEC immunosensor has good stability, high selectivity, and good repeatability. This work may provide a new way for the detection of CYFRA21-1 and other proteins.
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