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Li W, Jiang W, Dai S, Wang L. Multiplexed Detection of Cytokines Based on Dual Bar-Code Strategy and Single-Molecule Counting. Anal Chem 2016; 88:1578-84. [DOI: 10.1021/acs.analchem.5b03043] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Wei Li
- Key
Laboratory of Natural Products Chemical Biology, Ministry of Education,
School of Pharmacy, Shandong University, Jinan, 250012, P. R. China
| | - Wei Jiang
- School
of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, P. R. China
| | - Shuang Dai
- Key
Laboratory of Natural Products Chemical Biology, Ministry of Education,
School of Pharmacy, Shandong University, Jinan, 250012, P. R. China
| | - Lei Wang
- Key
Laboratory of Natural Products Chemical Biology, Ministry of Education,
School of Pharmacy, Shandong University, Jinan, 250012, P. R. China
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2
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Zhao W, Dong S, Sun L, Wang Q, Gai H. Investigating the photostability of quantum dots at the single-molecule level. Chem Asian J 2014; 9:3542-8. [PMID: 25234334 DOI: 10.1002/asia.201402453] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Revised: 06/15/2014] [Indexed: 11/11/2022]
Abstract
Quantum dots (QDs) have shown great potential to provide spatial, temporal, and structural information for biological systems. However, blinking, photobleaching, and spectral blueshift are adverse effects on their practical applications in biomedical research. An investigation of the effects of six reducing agents including cysteine (Cys), 1,4-dithiothreitol (DTT), ethyl gallate (EG), L-glutathione (GSH), mercaptoacetic acid (MAA), and thiourea (TU) on the photostability of single QDs was studied. Our experiments demonstrate that both DTT and EG effectively inhibit blinking, photobleaching, and spectral blueshift. GSH molecules block blinking and photobleaching of QDs. The other reagents, Cys, MAA, and TU, only have the ability to counteract blinking. Possible explanations are given on the basis of research evidence. The results suggest possibilities for significant improvements in QDs for biological applications by adjusting the environmental conditions.
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Affiliation(s)
- Wenfeng Zhao
- School of Chemistry and Chemical Engineering, Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, Jiangsu (P.R. China), Fax: (+86) 516-83536972
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3
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Ding Y, Liu X, Zhu J, Wang L, Jiang W. Quantitative single-molecule detection of protein based on DNA tetrahedron fluorescent nanolabels. Talanta 2014; 125:393-9. [DOI: 10.1016/j.talanta.2014.03.032] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 03/10/2014] [Accepted: 03/13/2014] [Indexed: 11/28/2022]
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4
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Emory JM, Peng Z, Young B, Hupert ML, Rousselet A, Patterson D, Ellison B, Soper SA. Design and development of a field-deployable single-molecule detector (SMD) for the analysis of molecular markers. Analyst 2011; 137:87-97. [PMID: 22005669 DOI: 10.1039/c1an15658f] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Single-molecule detection (SMD) has demonstrated some attractive benefits for many types of biomolecular analyses including enhanced processing speed by eliminating processing steps, elimination of ensemble averaging and single-molecule sensitivity. However, it's wide spread use has been hampered by the complex instrumentation required for its implementation when using fluorescence as the readout modality. We report herein a simple and compact fluorescence single-molecule instrument that is straightforward to operate and consisted of fiber optics directly coupled to a microfluidic device. The integrated fiber optics served as waveguides to deliver the laser excitation light to the sample and collecting the resulting emission, simplifying the optical requirements associated with traditional SMD instruments by eliminating the need for optical alignment and simplification of the optical train. Additionally, the use of a vertical cavity surface emitting laser and a single photon avalanche diode serving as the excitation source and photon transducer, respectively, as well as a field programmable gate array (FPGA) integrated into the processing electronics assisted in reducing the instrument footprint. This small footprint SMD platform was tested using fluorescent microspheres and single AlexaFluor 660 molecules to determine the optimal operating parameters and system performance. As a demonstration of the utility of this instrument for biomolecular analyses, molecular beacons (MBs) were designed to probe bacterial cells for the gene encoding Gram-positive species. The ability to monitor biomarkers using this simple and portable instrument will have a number of important applications, such as strain-specific detection of pathogenic bacteria or the molecular diagnosis of diseases requiring rapid turn-around-times directly at the point-of-use.
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Affiliation(s)
- Jason M Emory
- Department of Chemistry, Louisiana State University, 232 Choppin Hall, Baton Rouge, LA 70803, USA
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5
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Ultra-sensitive DNA assay based on single-molecule detection coupled with fluorescent quantum dot-labeling and its application to determination of messenger RNA. Anal Chim Acta 2011; 685:52-7. [DOI: 10.1016/j.aca.2010.11.012] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2010] [Revised: 11/05/2010] [Accepted: 11/05/2010] [Indexed: 11/21/2022]
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6
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Xue Q, Jiang D, Wang L, Jiang W. Quantitative Detection of Single Molecules Using Enhancement of Dye/DNA Conjugate-Labeled Nanoparticles. Bioconjug Chem 2010; 21:1987-93. [DOI: 10.1021/bc100212w] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qingwang Xue
- School of Chemistry and Chemical Engineering, Shandong University, 250100 Jinan, P.R. China, and School of Pharmacy, Shandong University, 250012 Jinan, P.R. China
| | - Dafeng Jiang
- School of Chemistry and Chemical Engineering, Shandong University, 250100 Jinan, P.R. China, and School of Pharmacy, Shandong University, 250012 Jinan, P.R. China
| | - Lei Wang
- School of Chemistry and Chemical Engineering, Shandong University, 250100 Jinan, P.R. China, and School of Pharmacy, Shandong University, 250012 Jinan, P.R. China
| | - Wei Jiang
- School of Chemistry and Chemical Engineering, Shandong University, 250100 Jinan, P.R. China, and School of Pharmacy, Shandong University, 250012 Jinan, P.R. China
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7
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Jiang D, Liu C, Wang L, Jiang W. Fluorescence single-molecule counting assays for protein quantification using epi-fluorescence microscopy with quantum dots labeling. Anal Chim Acta 2010; 662:170-6. [DOI: 10.1016/j.aca.2010.01.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2009] [Revised: 01/07/2010] [Accepted: 01/11/2010] [Indexed: 11/26/2022]
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8
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Peterson EM, Harris JM. Quantitative Detection of Single Molecules in Fluorescence Microscopy Images. Anal Chem 2009; 82:189-96. [PMID: 19957961 DOI: 10.1021/ac901710t] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eric M. Peterson
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850
| | - Joel M. Harris
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112-0850
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9
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Quantitative detection of antibody based on single-molecule counting by total internal reflection fluorescence microscopy with quantum dot labeling. Anal Chim Acta 2009; 634:83-8. [DOI: 10.1016/j.aca.2008.11.063] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2008] [Revised: 11/25/2008] [Accepted: 11/26/2008] [Indexed: 11/19/2022]
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10
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Spectral imaging of single molecules by transmission grating-based epi-fluorescence microscopy. Anal Chim Acta 2008; 619:209-14. [DOI: 10.1016/j.aca.2008.05.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2008] [Revised: 05/05/2008] [Accepted: 05/07/2008] [Indexed: 11/20/2022]
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11
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Li L, Tian X, Zou G, Shi Z, Zhang X, Jin W. Quantitative Counting of Single Fluorescent Molecules by Combined Electrochemical Adsorption Accumulation and Total Internal Reflection Fluorescence Microscopy. Anal Chem 2008; 80:3999-4006. [DOI: 10.1021/ac702534h] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lu Li
- School of Chemistry and Chemical Engineering and Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, China
| | - Xinzhe Tian
- School of Chemistry and Chemical Engineering and Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, China
| | - Guizheng Zou
- School of Chemistry and Chemical Engineering and Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, China
| | - Zhikun Shi
- School of Chemistry and Chemical Engineering and Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, China
| | - Xiaoli Zhang
- School of Chemistry and Chemical Engineering and Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, China
| | - Wenrui Jin
- School of Chemistry and Chemical Engineering and Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, Shandong University, Jinan 250100, China
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