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Salem JK, El-Nahhal IM, Salama SF. Determination of the critical micelle concentration by absorbance and fluorescence techniques using fluorescein probe. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.06.038] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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2
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Affiliation(s)
- Teresa L. Mako
- Department of Chemistry, University of Rhode Island, 140 Flagg Road, Kingston, Rhode Island 02881, United States
| | - Joan M. Racicot
- Department of Chemistry, University of Rhode Island, 140 Flagg Road, Kingston, Rhode Island 02881, United States
| | - Mindy Levine
- Department of Chemistry, University of Rhode Island, 140 Flagg Road, Kingston, Rhode Island 02881, United States
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3
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Yang C, Bie J, Zhang X, Yan C, Li H, Zhang M, Su R, Zhang X, Sun C. A label-free aptasensor for the detection of tetracycline based on the luminescence of SYBR Green I. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 202:382-388. [PMID: 29807336 DOI: 10.1016/j.saa.2018.05.075] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2018] [Revised: 05/17/2018] [Accepted: 05/20/2018] [Indexed: 06/08/2023]
Abstract
A novel fluorescent method based on tetracycline-binding aptamers and the luminescence of SYBR Green I (SGI) was established for the sensitive and selective detection of tetracycline. Under natural conditions, the aptamers of tetracycline show the G-quadruplex spatial structures while SGI is nearly nonfluorescent in aqueous solution. After mixture with the G-quadruplex structured aptamers, SGI can recognize and intercalate into the aptamers, resulting in a strong fluorescence emission. When the target tetracycline was added into the solution, the specific recognition and high-affinity binding of aptamers with tetracycline will induce the conformational changes of aptamers from G-quadruplex structures to hairpin structures. Thereafter, SGI will be released from the aptamer molecules, leading to the fluorescence decline. The quantitative detection of tetracycline can be achieved by measuring the fluorescence change of the system. Under the optimum conditions, the linear range of tetracycline in the milk was from 5 to 25 μg/mL, and the detection limit was as low as 0.10 μg/mL. The recoveries of the spiked milk samples were in the range of 98.98%-104.67% with the relative standard deviations (RSDs) of 0.16%-0.67%, and the results were in agreement with those from HPLC. Therefore, the biosensor based on the specific recognition of aptamers and the fluorescence properties of SGI can detect the tetracycline in milk accurately, rapidly and specifically.
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Affiliation(s)
- Chuanyu Yang
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun 130062, China
| | - Jiaxin Bie
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun 130062, China
| | - Xinmeng Zhang
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun 130062, China
| | - Caiyun Yan
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun 130062, China
| | - Hanjie Li
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun 130062, China
| | - Minghui Zhang
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun 130062, China
| | - Ruifang Su
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun 130062, China
| | - Xiaoguang Zhang
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun 130062, China.
| | - Chunyan Sun
- Department of Food Quality and Safety, College of Food Science and Engineering, Jilin University, Changchun 130062, China.
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4
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Abstract
Fluorogenic oligonucleotide probes that can produce a change in fluorescence signal upon binding to specific biomolecular targets, including nucleic acids as well as non-nucleic acid targets, such as proteins and small molecules, have applications in various important areas. These include diagnostics, drug development and as tools for studying biomolecular interactions in situ and in real time. The probes usually consist of a labeled oligonucleotide strand as a recognition element together with a mechanism for signal transduction that can translate the binding event into a measurable signal. While a number of strategies have been developed for the signal transduction, relatively little attention has been paid to the recognition element. Peptide nucleic acids (PNA) are DNA mimics with several favorable properties making them a potential alternative to natural nucleic acids for the development of fluorogenic probes, including their very strong and specific recognition and excellent chemical and biological stabilities in addition to their ability to bind to structured nucleic acid targets. In addition, the uncharged backbone of PNA allows for other unique designs that cannot be performed with oligonucleotides or analogues with negatively-charged backbones. This review aims to introduce the principle, showcase state-of-the-art technologies and update recent developments in the areas of fluorogenic PNA probes during the past 20 years.
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Affiliation(s)
- Tirayut Vilaivan
- Organic Synthesis Research Unit, Department of Chemistry, Faculty of Science, Chulalongkorn University, Phayathai Road, Patumwan, Bangkok 10330, Thailand
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5
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Qiao Y, Zheng X. Highly sensitive detection of copper ions by densely grafting fluorescein inside polyethyleneimine core-silica shell nanoparticles. Analyst 2016; 140:8186-93. [PMID: 26555568 DOI: 10.1039/c5an01880c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In this work, polyethyleneimine (PEI) core-silica shell nanoparticles were synthesized and used for densely grafting fluorescent receptor units inside the core of these particles to result in multi-receptor units collectively sensing a target. Herein, copper ion quenching of the fluorescence intensity of a fluorescein isothiocyanate (FITC) system was selected as a model to confirm our proof-of-concept strategy. Our results showed that, compared to free FITC in solution, a 10-fold enhancement of the Stern-Volmer constant value for Cu(2+) quenching of the fluorescence intensity of the grafted state of FITC in PEI core-silica shell nanoparticles was achieved. Furthermore, compared to a previous collective sensing scheme by densely grafting fluorescent receptor units on a silica nanoparticle surface, the proposed scheme, which grafted fluorescent receptor units inside a polymer nano-core, was simple, highly efficient and presented higher sensitivity.
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Affiliation(s)
- Yali Qiao
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China.
| | - Xingwang Zheng
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry & Chemical Engineering, Shaanxi Normal University, Xi'an 710062, P. R. China.
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6
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Huang J, Wang Z, Kim JK, Su X, Li Z. Detecting Arbitrary DNA Mutations Using Graphene Oxide and Ethidium Bromide. Anal Chem 2015; 87:12254-61. [DOI: 10.1021/acs.analchem.5b03369] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Jiahao Huang
- Department
of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Zhenyu Wang
- Department
of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Jang-Kyo Kim
- Department
of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Xuefen Su
- School of Public
Health and Primary Care, Faculty of Medicine, Prince of Wales Hospital, The Chinese University of Hong Kong,
Shatin, New Territories, Hong Kong
| | - Zhigang Li
- Department
of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
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7
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Pan L, Huang Y, Wen C, Zhao S. Label-free fluorescence probe based on structure-switching aptamer for the detection of interferon gamma. Analyst 2014; 138:6811-6. [PMID: 24058925 DOI: 10.1039/c3an01275a] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A novel label-free fluorescence probe based on structure-switching aptamer was developed for the detection of interferon-gamma (IFN-γ). In this work, a single stranded DNA (ssDNA) with G-rich sequence (aptamer) was folded into secondary G-quadruplex structures in the presence of Na(+) and Mg(2+), thiazole orange (TO) was then intercalated into the G-quadruplex structures, resulting in a high fluorescence emission. The target combined with its aptamer, disrupts G-quadruplex structure and releases TO, resulting in a reduction of fluorescence. Using IFN-γ as the model target, the proposed fluorescence probe shows a linear range from 3.0 to 120 nM with a detection limit of 2.0 nM. The proposed strategy avoids complicated covalent modifications or chemical labeling, and thus offers advantages of simplicity and cost efficiency.
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Affiliation(s)
- Li Pan
- Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources, College of Chemistry and Chemical Engineering, Guangxi Normal University, Guilin, 541004, China.
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8
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9
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Fei X, Hao Y, Gu Y, Li C, Yu L. Study on the Synthesis and Spectra of a Novel Kind of Carbozole Benzothiazole Indole Styryl Cyanine Dye with a Carbazole Bridged Chain. J Fluoresc 2013; 24:563-8. [DOI: 10.1007/s10895-013-1327-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Accepted: 11/07/2013] [Indexed: 01/29/2023]
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10
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Wang X, Zou M, Huang H, Ren Y, Li L, Yang X, Li N. Gold nanoparticle enhanced fluorescence anisotropy for the assay of single nucleotide polymorphisms (SNPs) based on toehold-mediated strand-displacement reaction. Biosens Bioelectron 2013; 41:569-75. [DOI: 10.1016/j.bios.2012.09.023] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Accepted: 09/15/2012] [Indexed: 10/27/2022]
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11
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12
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Esfandiari L, Monbouquette HG, Schmidt JJ. Sequence-specific nucleic acid detection from binary pore conductance measurement. J Am Chem Soc 2012; 134:15880-6. [PMID: 22931376 DOI: 10.1021/ja3059205] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We describe a platform for sequence-specific nucleic acid (NA) detection utilizing a micropipet tapered to a 2 μm diameter pore and 3 μm diameter polystyrene beads to which uncharged peptide nucleic acid (PNA) probe molecules have been conjugated. As the target NAs hybridize to the complementary PNA-beads, the beads acquire negative charge and become electrophoretically mobile. An applied electric field guides these NA-PNA-beads toward the pipet tip, which they obstruct, leading to an indefinite, electrically detectable, partial blockade of the pore. In the presence of noncomplementary NA, even to the level of single base mismatch, permanent pore blockade is not seen. We show application of this platform to detection of the anthrax lethal factor sequence.
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Affiliation(s)
- Leyla Esfandiari
- Department of Bioengineering, University of California, Los Angeles, California, United States
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13
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Zhu C, Liu L, Yang Q, Lv F, Wang S. Water-soluble conjugated polymers for imaging, diagnosis, and therapy. Chem Rev 2012; 112:4687-735. [PMID: 22670807 DOI: 10.1021/cr200263w] [Citation(s) in RCA: 843] [Impact Index Per Article: 70.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Chunlei Zhu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
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14
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Wang Y, Zhan R, Li T, Pu KY, Wang Y, Tan YC, Liu B. Fluorescence and visual detection of single nucleotide polymorphism using cationic conjugated polyelectrolyte. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:889-895. [PMID: 22047010 DOI: 10.1021/la203714e] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We report a simple assay for visual detection of single nucleotide polymorphisms (SNPs) with good sensitivity and selectivity. The selectivity is determined by Escherichia coli (E. coli) DNA ligase mediated circular formation upon recognition of the point mutation on DNA targets. Rolling cycle amplification (RCA) of the perfect-matched DNA target is then initiated using the in situ formed circular template in the presence of Phi29 enzyme. Due to amplification of the DNA target, the RCA product has a tandem-repeated sequence, which is significantly longer than that for the SNP strand. Direct addition of a cationic conjugated polymer of poly[9,9'-bis(6'-(N,N,N-trimethylammonium)hexyl)fluorene-co-9,9'-bis(2-(2-(2-(N,N,N-trimethylammonium)ethoxyl)-ethoxy)-ethyl)fluorene tetrabromide] containing 20 mol% 2,1,3-benzothiadiazole (PFBT(20)) into the RCA solution leads to blue-whitish fluorescent color for SNP strand and yellowish fluorescent color for amplified DNA, due to PFBT(20)/DNA complexation induced intrachain/interchain energy transfer. To further improve the contrast for visual detection, FAM-labeled peptide nucleic acid (PNA) was hybridized to each amplified sequence, which is followed by the addition of poly{2,7-[9,9-bis(6'-N,N,N-trimethylammoniumhexyl)]fluorene-co-2,5-difluoro-1,4-phenylene dibromide} (PFP). The PNA/DNA hybridization brings PFP and FAM-PNA into close proximity for energy transfer, and the solution fluorescent color appears green in the presence of target DNA with a detection limit of 1 nM, which is significantly improved as compared to that for most reported visual SNP assay.
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Affiliation(s)
- Yifan Wang
- Department of Chemical and Biomolecular Engineering, 4 Engineering Drive 4, National University of Singapore, Singapore 117567, Singapore
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15
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Song W, Lau C, Lu J. Quantum dot-based isothermal chain elongation for fluorescence detection of specific DNA sequences via template-dependent surface-hybridization. Analyst 2012; 137:1611-7. [DOI: 10.1039/c2an35067j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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16
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Lou X, Zhang Y, Li S, Ou D, Wan Z, Qin J, Li Z. A new polyfluorene bearing pyridine moieties: a sensitive fluorescent chemosensor for metal ions and cyanide. Polym Chem 2012. [DOI: 10.1039/c2py20022h] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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17
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Fei X, Gu Y, Li C, Yang X. Study on synthesis and spectrum of novel styryl cyanine dyes with a carbazole bridged chain. J Fluoresc 2011; 22:807-14. [PMID: 22108901 DOI: 10.1007/s10895-011-1014-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Accepted: 10/20/2011] [Indexed: 11/26/2022]
Abstract
Based on the frequently-used cyanine dye probe thiazole orange (TO), a novel kind of cyanine dye was designed and synthesized. Carbazole was inserted into the methylidyne structure of TO as a bridge to afford a kind of novel styryl cyanine dye with carbazole bridged chain. The dyes were characterized by HNMR and MS. The spectra of the novel dyes were also studied and the results showed that the fluorescent wavelength of novel carbzole dye shifted red for 100 nm, stock shift increased by 70 nm and the fluorescent intensity enhanced by 70 times compared to that of TO. When the novel dye was labeled by BSA, its fluorescent wavelength changed little and the intensity enhanced. It is indicated that it can be used as an excellent fluorescent probe in biological labeling.
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Affiliation(s)
- Xuening Fei
- School of Chemical Engineering and Technology, TianJin University, Tianjin, China.
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18
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Exploiting the interactions of PNA-DNA films with Ni2+ ions: detection of nucleobase mismatches and electrochemical genotyping of the single-nucleotide mismatch in apoE 4 related to Alzheimer's disease. Biosens Bioelectron 2011; 27:187-91. [PMID: 21752624 DOI: 10.1016/j.bios.2011.06.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Revised: 05/20/2011] [Accepted: 06/10/2011] [Indexed: 11/23/2022]
Abstract
The presence of Ni(2+) enables us to distinguish the presence of single-nucleotide mismatches in PNA (peptide nucleic acids)-DNA films on gold electrodes by electrochemical impedance spectroscopy (EIS). With the help of a modified Randles' equivalent circuit, differences in the charge transfer resistance (ΔR(CT)) before and after the addition of Ni(2+) are a diagnostic measure for the presence of single-nucleotide mismatch. The approach works under real-life conditions with concentrations of the DNA target strand down to 10 fM, and a PNA capture probe is used to genotype the single-nucleotide mismatch in apoE 4 related to Alzheimer's disease (AD).
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19
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A graphene-based platform for single nucleotide polymorphism (SNP) genotyping. Biosens Bioelectron 2011; 26:4213-6. [DOI: 10.1016/j.bios.2011.03.023] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Revised: 03/20/2011] [Accepted: 03/27/2011] [Indexed: 01/17/2023]
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20
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Dong S, Ou D, Qin J, Li Z. New imidazole-functionalized polyfluorene derivatives: convenient postfunctional syntheses, sensitive probes for metal ions and cyanide, and adjustable output signals with diversified fluorescence color. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24768] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Nakayama S, Kelsey I, Wang J, Roelofs K, Stefane B, Luo Y, Lee VT, Sintim HO. Thiazole orange-induced c-di-GMP quadruplex formation facilitates a simple fluorescent detection of this ubiquitous biofilm regulating molecule. J Am Chem Soc 2011; 133:4856-64. [PMID: 21384923 DOI: 10.1021/ja1091062] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Recently, there has been an explosion of research activities in the cyclic dinucleotides field. Cyclic dinucleotides, such as c-di-GMP and c-di-AMP, have been shown to regulate bacterial virulence and biofilm formation. c-di-GMP can exist in different aggregate forms, and it has been demonstrated that the polymorphism of c-di-GMP is influenced by the nature of cation that is present in solution. In previous work, polymorphism of c-di-GMP could only be demonstrated at hundreds of micromolar concentrations of the dinucleotide, and it has been a matter of debate if polymorphism of c-di-GMP exists under in vivo conditions. In this Article, we demonstrate that c-di-GMP can form G-quadruplexes at low micromolar concentrations when aromatic molecules such as thiazole orange template the quadruplex formation. We then use this property of aromatic molecule-induced G-quadruplex formation of c-di-GMP to design a thiazole orange-based fluorescent detection of this important signaling molecule. We determine, using this thiazole orange assay on a crude bacterial cell lysate, that WspR D70E (a constitutively activated diguanylate cyclase) is functional in vivo when overexpressed in E. Coli . The intracellular concentration of c-di-GMP in an E. Coli cell that is overexpressed with WspR D70E is very high and can reach 2.92 mM.
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Affiliation(s)
- Shizuka Nakayama
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
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22
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Electrochemical biosensors for detection of point mutation based on surface ligation reaction and oligonucleotides modified gold nanoparticles. Anal Chim Acta 2011; 688:163-7. [PMID: 21334481 DOI: 10.1016/j.aca.2011.01.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Revised: 12/21/2010] [Accepted: 01/04/2011] [Indexed: 11/23/2022]
Abstract
An electrochemical method for point mutation detection based on surface ligation reaction and oligonucleotides (ODNs) modified gold nanoparticles (AuNPs) was demonstrated. Point mutation identification was achieved using Escherichia coli DNA ligase. This system for point mutation detection relied on a sandwich assay comprising capture ODN immobilized on Au electrodes, target ODN and ligation ODN. Because of the sequence-specific surface reactions of E. coli DNA ligase, the ligation ODN covalently linked to the capture ODN only in the presence of a perfectly complementary target ODN. The presence of ligation products on Au electrode was detected using chronocoulometry through hybridization with reporter ODN modified AuNPs. The use of AuNPs improved the sensitivity of chronocoulometry in this approach, a detection limit of 0.9 pM complementary ODN was obtained. For single base mismatched ODN (smODN), a negligible signal was observed. Even if the concentration ratio of complementary ODN to smODN was decreased to 1:1000, a detectable signal was observed. This work may provide a specific, sensitive and cost-efficient approach for point mutant detection.
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Wang H, Li J, Wang Y, Jin J, Yang R, Wang K, Tan W. Combination of DNA ligase reaction and gold nanoparticle-quenched fluorescent oligonucleotides: a simple and efficient approach for fluorescent assaying of single-nucleotide polymorphisms. Anal Chem 2011; 82:7684-90. [PMID: 20726510 DOI: 10.1021/ac101503t] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A new fluorescent sensing approach for detection of single-nucleotide polymorphisms (SNPs) is proposed based on the ligase reaction and gold nanoparticle (AuNPs)-quenched fluorescent oligonucleotides. The design exploits the strong fluorescence quenching of AuNPs for organic dyes and the difference in noncovalent interactions of the nanoparticles with single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA), where ssDNA can be adsorbed onto the surface of AuNPs while dsDNA cannot be. In the assay, two half primer DNA probes, one being labeled with a dye and the other being phosphorylated, were first incubated with a target DNA template. In the presence of DNA ligase, the two captured ssDNAs are linked for the perfectly matched DNA target to form a stable duplex, but the duplex could not be formed by the single-base mismatched DNA template. After addition of AuNPs, the fluorescence of dye-tagged DNA probe will be efficiently quenched unless the perfectly matched DNA target is present. To demonstrate the feasibility of this design, the performance of SNP detection using two different DNA ligases, T4 DNA ligase and Escherichia coli DNA ligase, were investigated. In the case of T4 DNA ligase, the signal enhancement of the dye-tagged DNA for perfectly matched DNA target is 4.6-fold higher than that for the single-base mismatched DNA. While in the presence of E. coli DNA ligase, the value raises to be 30.2, suggesting excellent capability for SNP discrimination.
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Affiliation(s)
- Hao Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
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Li J, Huang YQ, Qin WS, Liu XF, Huang W. An optical-logic system based on cationic conjugated polymer/DNA/intercalating dyes assembly for label-free detection of conformational conversion of DNA i-motif structure. Polym Chem 2011. [DOI: 10.1039/c0py00375a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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25
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Zhu C, Pang S, Xu J, Jia L, Xu F, Mei J, Qin A, Sun J, Ji J, Tang B. Aggregation-induced emission of tetraphenylethene derivative as a fluorescence method for probing the assembling/disassembling of amphiphilic molecules. Analyst 2011; 136:3343-8. [DOI: 10.1039/c1an15176b] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Liu X, Fan Q, Huang W. DNA biosensors based on water-soluble conjugated polymers. Biosens Bioelectron 2011; 26:2154-64. [DOI: 10.1016/j.bios.2010.09.025] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2010] [Revised: 09/06/2010] [Accepted: 09/14/2010] [Indexed: 01/22/2023]
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27
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Martins SAM, Prazeres DMF, Fonseca LP, Monteiro GA. Optimization of DNA Hybridization on Aminopropyl-Controlled Pore-Glass Particles: Detection of Non-Labeled Targets by PicoGreen Staining. ANAL LETT 2010. [DOI: 10.1080/00032711003731431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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28
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Tang Y, Achyuthan KE, Whitten DG. Label-free and real-time sequence specific DNA detection based on supramolecular self-assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:6832-6837. [PMID: 20030336 DOI: 10.1021/la904008v] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A new label-free, optical method was developed to detect sequence-specific DNA based on supramolecular self-assembly. A cationic phenylene ethynylene oligomer with two pairs of positively charged side chains (OPE-2) can form a J-dimer or J-aggregate with negatively charged DNA by a combination of electrostatic and hydrophobic interactions. At microM concentrations of dsDNA (number of bases in ssDNA ranges from 8 to 32), the optimum supramolecular self-assembly occurs between OPE-2 and dsDNA and is characterized by a new absorption peak emerging at 418 nm and an increase in fluorescence intensity (about 4.5-fold for dsDNA(1)). In contrast, the self-assembled complexes between OPE-2 and ssDNA are less readily formed under the same conditions. Interestingly, the induced circular dichroism (CD) signal for OPE-2/ssDNA is quite strong, likely owing to the self-assembly onto ssDNA simultaneously templating helix formation. In contrast, the induced CD signal for OPE-2/dsDNA is weak, likely because the dsDNA is in a double helix conformation, and OPE-2 associated with the dsDNA should be outside of the helix. In fact, there is a steady decrease in the induced CD signal for ssDNA with the addition of equimolar complementary ssDNA over time that allows the monitoring of DNA hybridization in real time. Introduction of mismatched bases into the target DNA sequence prevents the full hybridization between ssDNA and the target DNA. For these cases, the decrease in the induced CD signals occurs more slowly and to a lesser extent, as some of the unhybridized portions may remain in helical association with OPE-2. In view of these observed signal changes, sequence specific DNA and single nucleotide mismatch can be detected in a very simple and sensitive manner without any modification of the DNA.
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Affiliation(s)
- Yanli Tang
- Center for Biomedical Engineering and Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131, USA
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Wang Y, Liu B, Mikhailovsky A, Bazan GC. Conjugated polyelectrolyte-metal nanoparticle platforms for optically amplified DNA detection. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2010; 22:656-659. [PMID: 20217768 DOI: 10.1002/adma.200902675] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Affiliation(s)
- Yusong Wang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576, Singapore
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Dishari SK, Pu KY, Liu B. Combinatorial Energy Transfer between an End-Capped Conjugated Polyelectrolyte and Chromophore-Labeled PNA for Strand-Specific DNA Detection. Macromol Rapid Commun 2009; 30:1645-50. [DOI: 10.1002/marc.200900281] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2009] [Accepted: 05/22/2009] [Indexed: 11/11/2022]
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