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Salman BI, Eltoukhi WE, Hassan YF. Applicability of Silver Nanoparticles as a Fluorescent Precursor for the Determination of Spectinomycin Hydrochloride in Human Plasma. JOURNAL OF ANALYTICAL CHEMISTRY 2022. [DOI: 10.1134/s1061934822110107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Zhang R, Lu H, Zong S, Lu C, Yun B, Hu G, Zhu L, Cui Y. Silicon-assisted surface enhanced fluorescence toward improved assay performances. NANOTECHNOLOGY 2021; 32:125201. [PMID: 33254158 DOI: 10.1088/1361-6528/abcef4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A novel scheme of silicon-assisted surface enhanced fluorescence (SEF) is presented for SEF-based assays, where the blank signal suppression and the fluorescence signal enhancement is combined. The P-doped, (100) oriented silicon substrate is used to quench the fluorescence of Rose Bengal (RB) molecules attached to it, resulting in an effectively suppressed background signal, which is useful for a lower limit of detection (LOD). When a proper quantity of silver nanoparticles (AgNPs) is deposited on the RB-attached silicon substrate, a significant fluorescence enhancement of up to around 290 fold is obtained, which helps to improve the sensitivity in fluorescence-based assays. Besides, conventional gold nanoparticles (AuNPs) have also been demonstrated to exhibit excellent SEF effect using the presented scheme, providing improved stability and biocompatibility. The mechanism of the observed SEF effect has been investigated, and both the decreased apparent quantum yield and the silicon-induced electric field redistribution are considered to play important roles. The experimental results suggest that the presented scheme holds great potential in the SEF-based assays aiming at higher sensitivity and lower LOD.
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Affiliation(s)
- Ruohu Zhang
- Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, People's Republic of China
| | - Hui Lu
- Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, People's Republic of China
| | - Shenfei Zong
- Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, People's Republic of China
| | - Changgui Lu
- Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, People's Republic of China
| | - Binfeng Yun
- Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, People's Republic of China
| | - Guohua Hu
- Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, People's Republic of China
| | - Li Zhu
- Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, People's Republic of China
| | - Yiping Cui
- Advanced Photonics Center, Southeast University, Nanjing 210096, Jiangsu, People's Republic of China
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Zhang R, Jin Z, Tian Z, Liu Y, Lu Z, Cui Y. A straightforward and sensitive “ON–OFF” fluorescence immunoassay based on silicon-assisted surface enhanced fluorescence. RSC Adv 2021; 11:7723-7731. [PMID: 35423268 PMCID: PMC8695005 DOI: 10.1039/d0ra08759a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 02/08/2021] [Indexed: 11/21/2022] Open
Abstract
A straightforward immunoassay based on silicon-assisted surface enhanced fluorescence (SEF) has been demonstrated using a silicon-based fluorescent immune substrate and silver-antibody nanoconjugate (SANC). The P-doped, (100) oriented silicon wafers are used for both fluorophore attachment and antigen immobilization. The silicon substrate offers a very low blank signal in the “OFF” state, due to its fluorescence quenching effect. In the detection process, the capture of the SANCs by the surface-immobilized antigen leads to an effectively enhanced fluorescence to produce an “ON” state. The analytical performance of the presented scheme has been investigated and a limit of detection of 31.4 pg mL−1 has been obtained. Besides the broadened application range compared with the conventional immunoassays, the presented scheme is straightforward, cost effective and sensitive, and is hence expected to find widespread applications in immunoassays as well as other fluorescence-based assays. A straightforward immunoassay based on silicon-assisted surface enhanced fluorescence (SEF) has been demonstrated using a silicon-based fluorescent immune substrate and silver-antibody nanoconjugate (SANC).![]()
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Affiliation(s)
- Ruohu Zhang
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
| | - Zhanrui Jin
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
| | - Zhengqiu Tian
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
| | - Yingzhou Liu
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
| | - Zhengqi Lu
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
| | - Yiping Cui
- Advanced Photonics Center
- Southeast University
- Nanjing 210096
- China
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Yin SN, Yao T, Wu TH, Zhang Y, Wang P. Novel metal nanoparticle-enhanced fluorescence for determination of trace amounts of fluoroquinolone in aqueous solutions. Talanta 2017; 174:14-20. [DOI: 10.1016/j.talanta.2017.05.053] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 05/11/2017] [Accepted: 05/18/2017] [Indexed: 11/16/2022]
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Wang Y, Zu X, Yi G, Luo H, Huang H, Song X. Ag Nanowire-Ag Nanoparticle Hybrids for the Highly Enhanced Fluorescene Detection of Protoporphyrin IX Based on Surface Plasmon-Enhanced Fluorescence. CHINESE J CHEM 2016. [DOI: 10.1002/cjoc.201600528] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Jahn M, Patze S, Hidi IJ, Knipper R, Radu AI, Mühlig A, Yüksel S, Peksa V, Weber K, Mayerhöfer T, Cialla-May D, Popp J. Plasmonic nanostructures for surface enhanced spectroscopic methods. Analyst 2016; 141:756-93. [DOI: 10.1039/c5an02057c] [Citation(s) in RCA: 143] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The development within the last five years in the field of surface enhanced spectroscopy methods was comprehensively reviewed.
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Wang P, Wu TH, Zhang Y. Novel silver nanoparticle-enhanced fluorometric determination of trace tetracyclines in aqueous solutions. Talanta 2016; 146:175-80. [DOI: 10.1016/j.talanta.2015.07.065] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 07/23/2015] [Indexed: 10/23/2022]
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Tian FS, Chen YH, Zhang YN. Highly sensitive spectrofluorimetric assay of copper(II). JOURNAL OF ANALYTICAL CHEMISTRY 2015. [DOI: 10.1134/s106193481504005x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zhang R, Wang Z, Song C, Yang J, Cui Y. A straightforward immunoassay applicable to a wide range of antibodies based on surface enhanced fluorescence. J Fluoresc 2013; 23:551-9. [PMID: 23463294 DOI: 10.1007/s10895-013-1187-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Accepted: 02/24/2013] [Indexed: 11/29/2022]
Abstract
A straightforward immunoassay based on surface enhanced fluorescence (SEF) has been demonstrated using a fluorescent immune substrate and antibody functionalized-silver nanoparticles. Unlike the conventional SEF-based immunoassay, which usually uses the dye-labeled antibodies and the metallic nanostructured-substrates, the presented immune system does not need the antibodies to be labeled with dye molecules. Thus, this immunoassay can be easily applied to the detection of a wide range of target antigens, which is of great importance for its practical application. The experimental results show that this immunoassay has a good specificity as well as the capacity of quantitative detection. Basically, the surface density of the immuno-adsorbed silver nanoparticles increases with the increased amount of target antigens, resulting in a fluorescence enhancement up to around 7 fold. The dose-responsive performance of the immunoassay has been investigated and the limit of detection (LOD) is 1 ng/mL. Due to its simple preparation method and the wide range of detectable antigens, this presented immunoassay is expected to be helpful for extending the SEF-based application.
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Affiliation(s)
- Ruohu Zhang
- Advanced Photonics Center, Southeast University, Nanjing, People's Republic of China
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Fu Y, Zhang J, Lakowicz JR. Largely enhanced single-molecule fluorescence in plasmonic nanogaps formed by hybrid silver nanostructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2731-8. [PMID: 23373787 PMCID: PMC3709438 DOI: 10.1021/la3048399] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
It has been suggested that narrow gaps between metallic nanostructures can be practical for producing large field enhancement. We design a hybrid silver nanostructure geometry in which fluorescent emitters are sandwiched between silver nanoparticles and silver island film (SIF). A desired number of polyelectrolyte layers are deposited on the SIF surface before the self-assembly of a second silver nanoparticle layer. Layer-by-layer configuration provides a well-defined dye position. It allows us to study the photophyical behaviors of fluorophores in the resulting gap at the single molecule level. The enhancement factor of a fluorophore located in the gap is much higher than those on silver surfaces alone and on glass. These effects may be used for increased detectability of single molecules bound to surfaces which contain metallic structures for either biophysical studies or high sensitivity assays.
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Affiliation(s)
- Yi Fu
- Center for Fluorescence Spectroscopy, Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, 725 W. Lombard Street, Baltimore, Maryland 21201, USA.
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