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Liu Y, Chen Z. New role of oil red O in detection of double stranded DNA. Talanta 2019; 204:337-343. [PMID: 31357302 DOI: 10.1016/j.talanta.2019.05.100] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Revised: 05/19/2019] [Accepted: 05/24/2019] [Indexed: 11/26/2022]
Abstract
Oil red O (ORO) is a commonly used dye for the tissue staining, which recognizes nitroglycerin and cholesterol esters. In this paper, we describe an unexpected finding that ORO can be fluorescently lighted up upon meeting dsDNA with emission peak localized at 600 nm, although it almost does not fluoresce by itself. This property triggered us to test its potential as a dsDNA fluorescence probe. The interaction of dsDNA and ORO was demonstrated by spectral and thermodynamic analysis and several other means. The fluorescence of ORO was gradually increased following the addition of dsDNA, which showed linear response toward dsDNA in the concentration range from 0.02 to 0.64 mg/mL with a detection limit of 0.69 μg/mL. Moreover, ORO showed excellent selectivity when testing with a variety of dsDNA-like biomolecules. Besides, ORO resisted photobleaching and worked very well under biological background. Altogether, we propose here a new nucleic acid lighting up fluorescence probe for double stranded dsDNA detection.
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Affiliation(s)
- Yang Liu
- State Key Laboratory of SupraMecular Structure and Materials, Institute of Theoretical Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, 130012, Changchun, PR China
| | - Zhijun Chen
- State Key Laboratory of SupraMecular Structure and Materials, Institute of Theoretical Chemistry, College of Chemistry, Jilin University, 2699 Qianjin Street, 130012, Changchun, PR China.
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2
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Hosseini M, Khaki F, Dadmehr M, Ganjali MR. Spectroscopic Study of CpG Alternating DNA-Methylene Blue Interaction for Methylation Detection. J Fluoresc 2016; 26:1123-9. [PMID: 27048226 DOI: 10.1007/s10895-016-1804-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2015] [Accepted: 03/27/2016] [Indexed: 01/29/2023]
Abstract
Recognition of methylated DNA sites would be useful strategy due to the important roles of methylation in disease occurrence and developmental processes. The interaction of CpG rich methylated and unmethylated DNA hybrid with methylene blue (MB) as an optical probe has been investigated by absorption, emission, circular dichorism and fluorescence anisotropy analysis. Titration of MB with both sequences caused a hypsochromism and decreased the absorption of MB that indicating an intercalative mode of interaction. The experimental results revealed that MB as the optical indicator could distinguish between the methylated and unmethylated DNA sequences. Under optimum conditions, upon the addition of methylated dsDNA, the fluorescence intensity increased in linear range from 1.0 × 10(-9) to 1.0 × 10(-6) M with detection limit of 7.2 × 10(-10) M and on the other hand, the intensity of MB showed no change with addition of unmethylated dsDNA.
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Affiliation(s)
- Morteza Hosseini
- Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran, Iran.
| | - Fereshteh Khaki
- Department of Life Science Engineering, Faculty of New Sciences & Technologies, University of Tehran, Tehran, Iran
| | - Mehdi Dadmehr
- Department of Biotechnology, Payame Noor University, Tehran, Iran
| | - Mohammad Reza Ganjali
- Center of Excellence in Electrochemistry, Faculty of Chemistry, University of Tehran, Tehran, Iran
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3
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Determination of nucleic acid by its enhancement effect on the fluorescence of Ellagic acid – Cationic surfactant system. J Mol Struct 2010. [DOI: 10.1016/j.molstruc.2010.01.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Zhang Z, Wang X, Wang Y, Yang X. Distinction of single base mismatches in duplex DNA using methylene blue as optical indicator. Analyst 2010; 135:2960-4. [DOI: 10.1039/c0an00359j] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Jia Z, Yang J, Wu X, Sun C, Liu S, Wang F, Zhao Z. The sensitive determination of nucleic acids using resonance light scattering quenching method. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2006; 64:555-9. [PMID: 16386949 DOI: 10.1016/j.saa.2005.07.052] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2005] [Accepted: 07/29/2005] [Indexed: 05/06/2023]
Abstract
It is found that in hexamethylene tetramine (HMTA)-HCl buffer of pH 7.00, nucleic acids can quench the resonance light scattering (RLS) of europium (III) (Eu3+)-2-thenoyltrifluoroacetne (TTA)-1,10-phenanthroline (Phen) system. Based on this, a sensitive method for the determination of nucleic acids is proposed. The experiments indicate that under the optimum conditions, the quenched RLS intensity is in proportion to the concentration of nucleic acids in the range of 1.0x10(-10) to 2.0x10(-6) g ml-1 for fish sperm (fsDNA), 1.0x10(-11) to 1.0x10(-6) g ml-1 for yeast RNA (yRNA), 5.0x10(-11) to 5.0x10(-7) g ml-1 for calf thymus DNA (ctDNA). Their detection limits (S/N=3) are 0.03, 0.006 and 0.002 ng ml-1, respectively. Therefore, the proposed method is the most sensitive RLS method for the determination of nucleic acids so far. The interaction between nucleic acids and Eu3+-TTA-Phen is also discussed.
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Affiliation(s)
- Zhen Jia
- Key Laboratory of Colloid and Interface Chemistry of Education Ministry, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, PR China
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Skripinets YV, Egorova AV, Ukrainets IV, Antonovich VP. Luminescence determination of DNA using terbium complexes with 2-oxo-4-hydroxyquinoline-3-carboxylic acid amides as probes. JOURNAL OF ANALYTICAL CHEMISTRY 2006. [DOI: 10.1134/s1061934806010102] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Xu Z, Bai G, Dong C. Studies on interaction of an intramolecular charge transfer fluorescence probe: 4′-Dimethylamino-2,5-dihydroxychalcone with DNA. Bioorg Med Chem 2005; 13:5694-9. [PMID: 16006133 DOI: 10.1016/j.bmc.2005.06.023] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2005] [Revised: 06/03/2005] [Accepted: 06/03/2005] [Indexed: 10/25/2022]
Abstract
The interaction of a new intramolecular charge transfer probe, namely 4'-dimethylamino-2,5-dihydroxychalcone (DMADHC), with calf thymus DNA has been studied. Compared to the spectral characteristics of the free form in aqueous solution, the fluorescence of DMADHC enhanced dramatically accompanying a blueshift of the emission maxima in the presence of DNA. The absorption and fluorescence spectra, salt concentration effect, KI quenching, fluorescence polarization, and DNA denaturation experiments were given. These results give evidence that the DMADHC molecule is inserted into the base-stacking domain of the DNA double helix. The intrinsic binding constant and the binding site number were estimated. The analytical characteristics were also given.
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Affiliation(s)
- Zhicheng Xu
- Department of Chemistry, Shanxi University, Taiyuan 030006, PR China
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8
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Zhou Y, Bian G, Wang L, Dong L, Wang L, Kan J. Sensitive determination of nucleic acids using organic nanoparticle fluorescence probes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2005; 61:1841-1845. [PMID: 15863055 DOI: 10.1016/j.saa.2004.07.013] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2004] [Accepted: 07/07/2004] [Indexed: 05/24/2023]
Abstract
This paper describes the preparation of organic nanoparticles by reprecipitation method under sonication and vigorous stirring. Transmission electron microscopy (TEM) was used to characterize the size and size distribution of the luminescent nanoparticles. Their average diameter was about 25 nm with a size variation of +/-18%. The fluorescence decay lifetime of the nanoparticles also was determined on a self-equipped fluorospectrometer with laser light source. The lifetime (approximately 0.09 micros) of nanoparticles is about three times long as that of the monomer. The nanoparticles were in abundant of hydrophilic groups, which increased their miscibility in aqueous solution. These organic nanoparticles have high photochemical stability, excellent resistance to chemical degradation and photodegradation, and a good fluorescence quantum yield (25%). The fluorescence can be efficiently quenched by nucleic acids. Based on the fluorescence quenching of nanoparticles, a fluorescence quenching method was developed for determination of microamounts of nucleic acids by using the nanoparticles as a new fluorescent probe. Under optimal conditions, maximum fluorescence quenching is produced, with maximum excitation and emission wavelengths of 345 and 402 nm, respectively. Under optimal conditions, the calibration graphs are linear over the range 0.4-19.0 microgml(-1) for calf thymus DNA (ct-DNA) and 0.3-19.0 microgml(-1) for fish sperm DNA (fs-DNA). The corresponding detection limits are 0.25 microgml(-1) for ct-DNA and 0.17 microgml(-1) for fs-DNA. The relative standard deviation of six replicate measurements is 1.3-2.1%. The method is simple, rapid and sensitive with wide linear range. The recovery and relative standard deviation are very satisfactory.
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Affiliation(s)
- Yunyou Zhou
- Institute of Analytical Chemistry, School of Chemistry and Material Science, Anhui Normal University, Wuhu 241000, China
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9
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Wang RY, Gao X, Lu YT. A surfactant enhanced stopped-flow kinetic fluorimetric method for the determination of trace DNA. Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2005.01.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Yegorova A, Karasyov A, Duerkop A, Ukrainets I, Antonovich V. New luminescent terbium complex for the determination of DNA. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2005; 61:109-116. [PMID: 15556428 DOI: 10.1016/j.saa.2004.03.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2003] [Accepted: 03/25/2004] [Indexed: 05/24/2023]
Abstract
New terbium complexes of derivatives of 2-oxo-4-hydroxy-quinoline-3-carboxylic acid are reported, which are highly luminescent, water soluble and do not require luminescence enhancers. The triplet-state energy levels of the ligands, the relative quantum yields (QYs) and the excitation maxima of the respective terbium chelates were determined. The large luminescence enhancement of one of these complexes by nucleic acids was investigated and a mechanism of its interaction with DNA is proposed. The optimal conditions for determination of DNA are equal concentrations of Tb(3+) and ligand R(1) (C = 1 x 10(-6) M), pH 9.0. Under optimal conditions the luminescence intensity (RI) is proportional to the concentration of fish sperm DNA (fsDNA) or calf thymus DNA (ctDNA), respectively, within the range of 0.05-1.5 microg ml(-1). The detection limits were 10 ng ml(-1) for fsDNA and 12 ng ml(-1) for ctDNA.
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Affiliation(s)
- Alla Yegorova
- AV Bogatsky Physico-Chemical Institute of the National Academy of Sciences of Ukraine, 86, Lustdorfskaya doroga, Odessa 65080, Ukraine
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Wang L, Dong L, Bian G, Xia T, Chen H, Wang L, Cao Q, Li L. Application of Organic Nanoparticles as Fluorescence Probe in the Determination of Nucleic Acids. ANAL LETT 2004. [DOI: 10.1081/al-120039427] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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12
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Liu R, Yang J, Sun C, Wu X, Li L, Su B. Study on the interaction between nucleic acids and cationic surfactants. Colloids Surf B Biointerfaces 2004; 34:59-63. [PMID: 15261091 DOI: 10.1016/j.colsurfb.2003.11.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/05/2003] [Indexed: 11/27/2022]
Abstract
The interactions of nucleic acids and cationic surfactants (cetylpyridine bromide (CPB) and cetyltrimethylammonium bromide (CTMAB)) in aqueous solution have been studied using the techniques of resonance light scattering (RLS) spectroscopy, the absorption spectroscopy, zeta potential assay and NMR assignment measurement. It is considered that CPB or CTMAB can assemble on the surface of nucleic acid via electrostatic and hydrophobic forces, which results in the formation of large associate of nucleic acid-cationic surfactant and RLS enhancement of nucleic acid. Besides these forces, the pi-pi stacking force between CPB and nucleic acid also exists in the associate. In comparison with CTMAB, CPB has larger enhancement on RLS of nucleic acid, which is attributed to that the enhancement of the former is only due to the absorption of the bases of nucleic acid, while the enhancement of the latter is own to the synergetic resonance caused by the absorption of both bases of nucleic acid and the pyridyl in CPB. These results have important implication for understanding the influence of surfactants on nucleic acid functionality in life science.
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Affiliation(s)
- Rutao Liu
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China
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Wang Y, Yang J, Wu X, Li L, Sun S, Su B, Zhao Z. Progress of Spectral Probes for Nucleic Acids. ANAL LETT 2003. [DOI: 10.1081/al-120023702] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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14
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Song G, Li L, Liu L, Fang G, Lu S, He Z, Zeng Y. Fluorometric determination of DNA using a new ruthenium complex Ru(bpy)2PIP(V) as a nucleic acid probe. ANAL SCI 2002; 18:757-9. [PMID: 12137369 DOI: 10.2116/analsci.18.757] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A new ligand, 2-phenyl(5-fluoro)imidazo[f]-1,10-phenanthroline (PIP(V)), and its coordination compounds, Ru(bpy)2PIP(V), were synthesized. The fluorescence spectrum of the interaction between Ru(bpy)2PIP(V) and DNA was studied, and a very strong fluorescence peak at a wavelength of 589 nm appeared. The optimum condition of analyzing DNA was decided. The method is simple, convenient and fast, and also has high sensitivity and good selectivity. It has been satisfactorily employed for determinations in synthesized samples.
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Affiliation(s)
- Gongwu Song
- Analysis and Testing Center, Hubei University, Wuhan, China.
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Liu R, Yang J, Wu X. Interaction of cetylpyridine bromide with nucleic acids and determination of nucleic acids at nanogram levels based on the enhancement of resonance Rayleigh light scattering. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2002; 58:1935-1942. [PMID: 12164493 DOI: 10.1016/s1386-1425(01)00657-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Resonance Rayleigh light scattering (RRLS) spectra of cetylpyridine bromide (CPB)-nucleic acid system and their analytical application have been first studied. The effective factors and optimum conditions of the reaction have been investigated. After CPB and nucleic acid are mixed together, a new absorption peak located at 300 nm appeared, which is due to the formation of new ion associate of CPB-nucleic acid. The new associate can result in two apparent RRLS peaks at 310-400 and 460-480 nm. The RRLS peak of the corrected spectra located at 290-350 nm, which indicate that the RRLS is originated from the absorption of CPB-nucleic acid associate. The peak at 460-480 nm disappears in the corrected RRLS spectra, which indicated that this peak is originated from the strong line emission of the Xe lamp. Under the optimum conditions, the enhanced intensity of RRLS is proportional to the concentration of nucleic acid in the range of 5.0 x 10(-9)-5.0 x 10(-5) g ml(-1) for calf thymus DNA (ctDNA), 1.0 x 10(-8)-4.0 x 10(-5) g ml(-1) for fish sperm DNA (fsDNA) and 1.0 x 10(-8)-5.0 x 10(-5) g ml(-1) for yeast RNA (yRNA). The detection limits (S/N = 3) are 4.3, 8.7 and 7.4 ng ml(-1), respectively. Synthetic samples were determined satisfactorily.
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Affiliation(s)
- Rutao Liu
- Department of Chemistry, Shandong University, Jinan, People's Republic of China
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Liu R, Yang J, Wu X, Sun C. Study on the resonance light scattering spectrum of berberine-cetyltrimethylammonium bromide system and the determination of nucleic acids at nanogram levels. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2002; 58:457-465. [PMID: 11905531 DOI: 10.1016/s1386-1425(01)00554-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The interaction of berberine with nucleic acid in the presence of cetyltrimethylammonium bromide (CTMAB) in aqueous solution has been studied by spectrophotometry and resonance light scattering (RLS) spectroscopy. At pH 7.30, the RLS signals of berberine were greatly enhanced by nucleic acid in the region of 300-600 nm characterized by four peaks at 324.0, 386.5, 416.5 and 465.0 nm. The binding properties were examined by using a Scatchard plot based on the measurement of enhanced RLS data at 416.5 nm. Under optimum conditions, the increase of RLS intensity of this system at 416.5 nm is proportional to the concentration of nucleic acid. The linear range is 7.5 x 10(-9)-7.5 x 10(-5) g ml(-1) for calf thymus DNA, 7.5 x 10(-9)-2.5 x 10(-5) g ml(-1) for herring sperm DNA, and 5.0 x 10(-9)-2.5 x 10(-5) g ml(-1) for yeast RNA. The detection limits (S/N = 3) are 2.1 ng ml(-1) for calf thymus DNA, 6.5 ng ml(-1) for herring sperm DNA and 3.5 ng ml(-1) for yeast RNA, respectively. Three synthetic samples were analyzed satisfactorily.
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Affiliation(s)
- Rutao Liu
- Key Lab for Colloid and Interface Chemistry of Education Ministry, Department of Chemistry, Shandong University, Jinan, China
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Liu R, Yang J, Wu X, Sun C. Interaction of cetyltrimethylammonium bromide with nucleic acids and determination of nucleic acids at nanogram levels based on the measurement of light scattering. Anal Chim Acta 2001. [DOI: 10.1016/s0003-2670(01)01112-6] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Ling LS, He ZK, Song GW, Yuan D, Zeng YE. A novel method for determination of DNA by use of molecular ‘Light Switch’ complex of Ru(bipy)2(dppx)2+. Anal Chim Acta 2000. [DOI: 10.1016/s0003-2670(99)00470-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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20
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Lin C, Yang J, Wu X, Zhang G, Liu R, Cao X, Han R. Enhanced fluorescence of the terbium–gadolinium–nucleic acids system and the determination of nucleic acids. Anal Chim Acta 2000. [DOI: 10.1016/s0003-2670(99)00653-4] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Lin C, Yang J, Zhang G, Wu X, Han R, Cao X, Gao Z. Study of the reaction between nucleic acids and the trihydroxyanthroquinone–Al complex and its analytical application. Anal Chim Acta 1999. [DOI: 10.1016/s0003-2670(99)00259-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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23
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HAN H, LI X, HE Z, LIN L, ZENG Y. Development of a Direct Chemiluminescence Method for the Determination of Nucleic Acids Based upon Their Reaction with Cerium(IV) in the Presence of Rutheniumtrisdipyridine. ANAL SCI 1999. [DOI: 10.2116/analsci.15.885] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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24
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Wu X, Yang J, Huang F, Wang M, Sun L, Xu G. Study of the Reaction between Nucleic Acids and TB-BPMPHD-CTMAB Complex and its Analytical Application. ANAL LETT 1999. [DOI: 10.1080/00032719908542978] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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25
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Yang J, Lin C, Zhang G, Gao Z, Wu X, Huang X. Study on a fluorescence-enhanced system of 1,2,4-trihydroxyanthroquinone-Be(2+)-DNA. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 1998; 54A:2019-2024. [PMID: 9861689 DOI: 10.1016/s1386-1425(98)00223-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Fluorescence-enhancement of 1,2,4-trihydroxyanthroquinone (THAQ)-Be2+ complex enhanced by nucleic acid was studied. Experimental results revealed that double-stranded DNA can enhance remarkably the fluorescence intensity of THAQ-Be2+, while RNA cannot. Based on these results, a fluorescence method for the selective determination of DNA in the presence of RNA was developed. Maximum fluorescence intensity was found in the pH range 3.6-4.5 with maximum excitation and emission wavelengths at 510 and 565 nm, respectively. Under optimum conditions, the calibration graph was linear over the range 0.08-18 micrograms ml-1 for double-stranded fish sperm DNA (fsDNA) with the detection limit being 2.75 x 10(-8) g ml-1. The method was applied for the determination of DNA in synthetic samples. The relative S.D. for five replicates was within 4%. In addition, the interaction mechanism of THAQ-Be2+ with DNA was also discussed.
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Affiliation(s)
- J Yang
- Department of Chemistry, Shandong University, Jinan, People's Republic of China
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