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Feng Y, Yi K, Gong F, Zhang Y, Shan X, Ji X, Zhou F, He Z. Ultra-sensitive detection of SARS-CoV-2 S1 protein by coupling rolling circle amplification with poly(N-isopropylacrylamide)-based sandwich-type assay. Talanta 2024; 279:126572. [PMID: 39024855 DOI: 10.1016/j.talanta.2024.126572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2024] [Revised: 07/12/2024] [Accepted: 07/13/2024] [Indexed: 07/20/2024]
Abstract
In the past few years, the COVID-19 pandemic, caused by Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) seriously threatens global public health security due to its high contagiousness. It remains of vital importance to develop a rapid and sensitive assay for SARS-CoV-2. In this work, we proposed a sandwich-type assay based on poly(N-isopropylacrylamide) (PNIPAM), allowing efficient detection of the SARS-CoV-2 S1 protein in the homogeneous solution. Firstly, a direct sandwich-type assay was established with a linear range of 0.2-2 μg/mL and a limit of detection (LOD) of 0.11 μg/mL, which could realize rapid detection in about 1 h. Furthermore, the sandwich-type assay coupled with rolling circle amplification (RCA) obtained an increase in sensitivity of 5.9 × 104 folds with a wide linear range of 0.01 - 100 ng/mL and a LOD of 1.88 pg/mL. The average recoveries in unpretreated saliva were 90 %-113.0 %, indicating the potential of the developed method for application in practical samples. Given the high selectivity and sensitivity of the developed method, it has a significant potential for rapid and early detection of SARS-CoV-2.
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Affiliation(s)
- Yu Feng
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Kebing Yi
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Feng Gong
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Yaran Zhang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Xiaoyun Shan
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Xinghu Ji
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China.
| | - Fuxiang Zhou
- Department of Radiation and Medical Oncology, Hubei Key Laboratory of Tumor Biological Behaviors, and Hubei Cancer Clinical Study Center, Zhongnan Hospital of Wuhan University, Wuhan, 430072, China
| | - Zhike He
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China; Department of Radiation and Medical Oncology, Hubei Key Laboratory of Tumor Biological Behaviors, and Hubei Cancer Clinical Study Center, Zhongnan Hospital of Wuhan University, Wuhan, 430072, China.
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Zhang Y, Yi K, Gong F, Tang Z, Feng Y, Tian Y, Xiang M, Zhou F, Liu M, Ji X, He Z. A simple, rapid and sensitive sandwich immunoassay based on poly(N-isopropylacrylamide) for the detection of alpha-fetoprotein. Talanta 2024; 274:125932. [PMID: 38537351 DOI: 10.1016/j.talanta.2024.125932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 03/03/2024] [Accepted: 03/14/2024] [Indexed: 05/04/2024]
Abstract
Alpha-fetoprotein (AFP), as a tumor marker, plays a vital role in the diagnosis of liver cancer. In this work, a novel sandwich immunoassay based on a thermosensitive polymer, poly(N-isopropylacrylamide) (PNIPAM), was developed for the detection of AFP. This immunoassay could realize one-step rapid reaction within 1 h, and facilitate the separation of the target molecules by incorporating PNIPAM. In this method, a conjugate of PNIPAM and capture antibody (Ab1) was successfully synthesized as a capture probe and the synthetic method of PNIPAM-Ab1 was simple, while the detection antibody (Ab2) was labeled with fluorescein isothiocyanate (FITC) to form a fluorescent detection probe. By employing a sandwich immunoassay, the method achieved quantitative determination of AFP, exhibiting a wide linear range from 5 ng/mL to 200 ng/mL and a low detection limit of 2.44 ng/mL. Furthermore, it was successfully applied to the analysis of spiked human serum samples and the screening of patients with hepatic diseases in clinical samples, indicating its potential application prospect in the diagnosis of liver cancer.
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Affiliation(s)
- Yaran Zhang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Kebing Yi
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Feng Gong
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Ziwen Tang
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Yu Feng
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Yilong Tian
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China
| | - Ming Xiang
- Center for Single-Cell Omics and Tumor Liquid Biopsy, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Fuxiang Zhou
- Department of Radiation and Medical Oncology, Hubei Key Laboratory of Tumor Biological Behaviors, Hubei Province Cancer Clinical Study Center, Zhongnan Hospital of Wuhan University, 430072, Wuhan, China
| | - Min Liu
- Department of Laboratory Medicine, Zhongnan Hospital of Wuhan University, Wuhan, China
| | - Xinghu Ji
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China.
| | - Zhike He
- College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China; Department of Radiation and Medical Oncology, Hubei Key Laboratory of Tumor Biological Behaviors, Hubei Province Cancer Clinical Study Center, Zhongnan Hospital of Wuhan University, 430072, Wuhan, China.
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Huang S, Li W, Zhou X, Xie M, Luo Q, Wen H, Luo Y, Xue W. One-step synthesis of levodopa functionalized carbon quantum dots for selective detection of tyrosinase and inhibitor screening. Microchem J 2020. [DOI: 10.1016/j.microc.2020.105456] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Niu L, Wang X, Mao G, Li Z, Ji X, He Z. Sensitive fluorescent detection of methyltransferase based on thermosensitive poly(N-isopropylacrylamide). Talanta 2018; 189:579-584. [PMID: 30086963 DOI: 10.1016/j.talanta.2018.07.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 06/29/2018] [Accepted: 07/10/2018] [Indexed: 12/21/2022]
Abstract
DNA methyltransferase (MTase) has a crucial role in many biological processes, its abnormal expression level has been regarded as a predictive cancer biomarker. Herein, a sensitive fluorescence method based on thermosensitive poly (N-isopr-opylacrylamide) was developed to assay of M.SssI activity. When the M.SssI was introduced, dsDNA was methylated at palindromic sequence 5'-CmCGG-3' and became resistant to cleavage by the endonuclease HpaII. Therefore, a biotin modified ssDNA and a FAM modified ssDNA were designed including the recognized sites for both methyltransferase M.SssI and endonuclease HpaII. By SA-biotin intereaction, the DNA was conjugated to thermosensitive poly (N-isopropylacrylamide) modified by SA, the methylated substrate fluorescence was increased with the concentration of M.SssI increasing. The proposed method has a low detection limit of 0.18 U/mL. This simple method can be a useful tool to apply in diagnosis and biomedical research, which was successfully investigated in the serum sample.
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Affiliation(s)
- Longqing Niu
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Xinxin Wang
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Guobin Mao
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Zheng Li
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Xinghu Ji
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China
| | - Zhike He
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, China.
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