201
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Xu X, Zhang J, Yang F, Yang X. Colorimetric logic gates for small molecules using split/integrated aptamers and unmodified gold nanoparticles. Chem Commun (Camb) 2011; 47:9435-7. [PMID: 21779550 DOI: 10.1039/c1cc13459k] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Herein we report the "OR" and "AND" colorimetric logic gates for small molecules using split/integrated aptamers and unmodified gold nanoparticles, which generate visually observed outputs according to Boolean operations.
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Affiliation(s)
- Xiaowen Xu
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, Jilin, PR China
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202
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Freeman R, Liu X, Willner I. Chemiluminescent and chemiluminescence resonance energy transfer (CRET) detection of DNA, metal ions, and aptamer-substrate complexes using hemin/G-quadruplexes and CdSe/ZnS quantum dots. J Am Chem Soc 2011; 133:11597-604. [PMID: 21678959 DOI: 10.1021/ja202639m] [Citation(s) in RCA: 415] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Nucleic acid subunits consisting of fragments of the horseradish peroxidase (HRP)-mimicking DNAzyme and aptamer domains against ATP or sequences recognizing Hg(2+) ions self-assemble, in the presence of ATP or Hg(2+), into the active hemin-G-quadruplex DNAzyme structure. The DNAzyme-generated chemiluminescence provides the optical readout for the sensing events. In addition, the DNAzyme-stimulated chemiluminescence resonance energy transfer (CRET) to CdSe/ZnS quantum dots (QDs) is implemented to develop aptamer or DNA sensing platforms. The self-assembly of the ATP-aptamer subunits/hemin-G-quadruplex DNAzyme, where one of the aptamer subunits is functionalized with CdSe/ZnS QDs, leads to the CRET signal. Also, the functionalization of QDs with a hairpin nucleic acid that includes the G-quadruplex sequence in a ''caged'' configuration is used to analyze DNA. The opening of the hairpin structure by the target DNA assembles the hemin-G-quadruplex DNAzyme that stimulates the CRET signal. By the application of three different sized QDs functionalized with different hairpins, the multiplexed analysis of three different DNA targets is demonstrated by the generation of three different CRET luminescence signals.
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Affiliation(s)
- Ronit Freeman
- Institute of Chemistry, Center of Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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203
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Zhou Z, Du Y, Dong S. Double-strand DNA-templated formation of copper nanoparticles as fluorescent probe for label-free aptamer sensor. Anal Chem 2011; 83:5122-7. [PMID: 21612269 DOI: 10.1021/ac200120g] [Citation(s) in RCA: 180] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Double-strand DNA (dsDNA) can act as an efficient template for the formation of copper nanoparticles (Cu NPs) at low concentration of CuSO(4), and the formed Cu NPs have excellent fluorescence, whereas a single-strand DNA (ssDNA) template does not support Cu NPs' formation. This property of dsDNA-Cu NPs makes it suitable for DNA sensing. However, exploration of dsDNA-Cu NPs applied in biological analysis is still at an early stage. In this regard, we report herein for the first time a sensitive, cost-effective, and simple aptamer sensor (aptasensor) using dsDNA-Cu NPs as fluorescent probe. The design consists of a dsDNA with reporter DNA (here, aptamer) as template for the formation of Cu NPs, and the formed dsDNA-Cu NPs show high fluorescence. Using adenosine triphosphate (ATP) as a model analyte, the introduction of ATP triggers the structure switching of reporter DNA to form aptamer-ATP complex, causing the destruction of the double helix and thus no formation of the Cu NPs, resulting in low fluorescence. The preferable linear range (0.05-500 μM), sensitivity (LOD 28 nM), and simplicity for the detection of ATP indicate that dsDNA-Cu NPs may have great prospects in the field of biological analysis. We also use this novel fluorescent probe to determine ATP in 1% human serum and human adenocarcinoma HeLa cells. The dsDNA-Cu NPs probes provide recovery of 104-108% in 1% human serum and a prominent fluorescent signal is obtained in cellular ATP assay, revealing the practicality of using dsDNA-Cu NPs for the determination of ATP in real samples. Besides, this design is simply based on nucleic acid hybridization, so it can be generally applied to other aptamers for label-free detection of a broad range of analytes. Successful detection of cocaine with detection limit of 0.1 μM demonstrates its potential to be a general method.
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Affiliation(s)
- Zhixue Zhou
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, People's Republic of China
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204
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Husaini AM, Rashid Z, Mir RUR, Aquil B. Approaches for gene targeting and targeted gene expression in plants. ACTA ACUST UNITED AC 2011; 2:150-62. [PMID: 22179193 DOI: 10.4161/gmcr.2.3.18605] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Transgenic science and technology are fundamental to state-of-the-art plant molecular genetics and crop improvement. The new generation of technology endeavors to introduce genes 'stably' into 'site-specific' locations and in 'single copy' without the integration of extraneous vector 'backbone' sequences or selectable markers and with a 'predictable and consistent' expression. Several similar strategies and technologies, which can push the development of 'smart' genetically modified plants with desirable attributes, as well as enhance their consumer acceptability, are discussed in this review.
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Affiliation(s)
- Amjad Masood Husaini
- Division of Plant Breeding and Genetics; Sher-e-Kashmir University of Agricultural Sciences and Technology of Kashmir; Shalimar, India.
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205
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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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206
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Raichlin S, Sharon E, Freeman R, Tzfati Y, Willner I. Electron-transfer quenching of nucleic acid-functionalized CdSe/ZnS quantum dots by doxorubicin: a versatile system for the optical detection of DNA, aptamer-substrate complexes and telomerase activity. Biosens Bioelectron 2011; 26:4681-9. [PMID: 21684146 DOI: 10.1016/j.bios.2011.05.016] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Revised: 05/01/2011] [Accepted: 05/12/2011] [Indexed: 11/29/2022]
Abstract
The optical detection of DNA or the sensing of low-molecular-weight substrates or proteins by aptamer nucleic acids is a long term challenge in the design of biosensors. Similarly, the detection of the telomerase activity, a versatile biomarker of cancer cells, is important for rapid cancer diagnostics. We implement the luminescence quenching of the CdSe/ZnS quantum dots (QDs) as a versatile process to develop DNA sensors and aptasensors, and to design an analytical platform for the detection of telomerase activity. The formation of nucleic acid duplexes on QDs, or the assembly of aptamer-substrate complexes on the QDs (substrate=cocaine or thrombin) is accompanied by the intercalation of doxorubicin (DB) into the duplex domains of the resulting recognition complexes. The intercalated DB quenches the luminescence of the QDs, thus leading to the detection readout signal. Similarly, the telomerase-induced formation of the telomere chains on the QDs is followed by the hybridization of nucleic-acid units complementary to the telomere repeat units, and the intercalation of DB into the resulting duplex structure. The resulting luminescence quenching of the QDs provides an indicating signal for the activity of telomerase.
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Affiliation(s)
- Sara Raichlin
- Institute of Chemistry, The Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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207
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Liu B, Ye S, Zou Y, Peng B, He Y, Zhou K. A Dithienyl Benzotriazole-based Polyfluorene: Synthesis and Applications in Polymer Solar Cells and Red Light-Emitting Diodes. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201100080] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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208
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Kim J, Kim MY, Kim HS, Hah SS. Binding of uranyl ion by a DNA aptamer attached to a solid support. Bioorg Med Chem Lett 2011; 21:4020-2. [PMID: 21612923 DOI: 10.1016/j.bmcl.2011.04.139] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Revised: 04/11/2011] [Accepted: 04/29/2011] [Indexed: 10/18/2022]
Abstract
A UO(2)(2+)-specific DNA aptamer was attached to aminopolystyrene (aminoPS) using sulfo-SMCC as a crosslinking agent in view of high affinity of DNA for uranyl ion. Capacity of the aptamer-conjugated aminoPS resins for uranyl uptake was measured, revealing that about 0.63 μg of uranium can be complexed to 1g of the resins, which clearly demonstrates that most of DNA aptamers introduced to the resins can strongly bind to uranyl ion. In the presence of 21 mM bicarbonate ion at pH 8.01, apparent dissociation constant (K(d)(app)) of about 84.6 pM and log formation constant (K(f)) of about 22.9 were obtained. Results of the present study strongly suggest that modification of the aptamer-containing resins can improve uranyl-binding ability, probably leading to economical recovery of uranium from seawater.
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Affiliation(s)
- Jisu Kim
- Department of Chemistry, Research Institute for Basic Sciences, and Research Center for New Nano Bio Fusion Technology, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea
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209
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Mesoporous carbon microparticles as a novel fluorescent sensing platform for thrombin detection. Biosens Bioelectron 2011; 26:3876-80. [DOI: 10.1016/j.bios.2011.02.051] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2011] [Revised: 02/21/2011] [Accepted: 02/28/2011] [Indexed: 11/24/2022]
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210
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211
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Li Y, Bai H, Li C, Shi G. Colorimetric assays for acetylcholinesterase activity and inhibitor screening based on the disassembly-assembly of a water-soluble polythiophene derivative. ACS APPLIED MATERIALS & INTERFACES 2011; 3:1306-1310. [PMID: 21438627 DOI: 10.1021/am200101n] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A complex between an anionic polythiophene derivative (PT-COO(-)) and a cationic surfactant, myristoylcholine, has been prepared and applied to be colorimetric probe for acetylcholinesterase (AChE) assays. The complex formation process, AChE activity assay and inhibitor screening has been studied by absorption spectroscopy. It was confirmed that the introduction of myristoylcholine into PT-COO(-) phosphate buffer solution resulted in the disassembly of PT-COO(-) aggregates, and further addition of AChE into the above solution led to the reassembly of PT-COO(-) due to the catalyzed hydrolysis of myristoylcholine and the collapse of the complex. The colorimetric assay for AChE can be readily realized with the concentration of AChE as low as 0.2 U/mL. The results also demonstrate that the colorimetric approach can be applied for screening inhibitors of AChE.
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Affiliation(s)
- Yugang Li
- Department of Chemistry, Tsinghua University, Beijing 100084, China
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212
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Hun X, Chen H, Wang W. A electrogenerated chemiluminescence biosensor for Ramos cancer cell using DNA encapsulated Ru(bpy)₃Cl₂ as signal probe. Biosens Bioelectron 2011; 26:3887-93. [PMID: 21478009 DOI: 10.1016/j.bios.2011.03.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Revised: 03/01/2011] [Accepted: 03/01/2011] [Indexed: 11/17/2022]
Abstract
A label-free sensing technology for detection of Ramos cell was developed based on a signal probe Ru(bpy)3Cl2 (Ru) encapsulated by DNA. Gold electrode or magnetic bead as the sensing surface was firstly modified with long-strand DNA with five repeating units. Then two kinds of short-strand DNA are grafted onto the long-strand DNA to form DNA strands A and B (L-A and L-B) through the hybridization, respectively. The addition of aptamer initiates hybridization of L-A and L-B with the aptamer sequence. As the hybridization proceeds, the four kinds of DNA would finally transform into a three-dimensional network structure and the signal probe Ru was encapsulated by DNA simultaneously. When Ramos cells are introduced to interact with the aptamer, the signal probe is released. In order to confirm the generality of this method the ferrocenecarboxylic acid and luminol selected as a signal probe mode were also tested. The Ru used as a signal probe for electrogenerated chemiluminescence (ECL) detection was detailedly studied. With this ECL biosensor, detection limit as low as 58 cells/mL was achieved for Ramos cell. The biosensor also exhibited excellent sensitivity and selectivity.
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Affiliation(s)
- Xu Hun
- State Key Laboratory Base of Eco-chemical Engineering, China; College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Huaicheng Chen
- State Key Laboratory Base of Eco-chemical Engineering, China; College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
| | - Wei Wang
- State Key Laboratory Base of Eco-chemical Engineering, China; College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
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213
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Zhang Y, Sun X. A novel fluorescent aptasensor for thrombin detection: using poly(m-phenylenediamine) rods as an effective sensing platform. Chem Commun (Camb) 2011; 47:3927-9. [PMID: 21350737 DOI: 10.1039/c1cc10402k] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this communication, we develop a novel fluorescent aptasensor for thrombin detection with the use of poly(m-phenylenediamine) (PMPD) rods as an effective sensing platform. This aptasensor exhibits extraordinarily high sensitivity with a detection limit as low as 100 pM and excellent selectivity.
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Affiliation(s)
- Yingwei Zhang
- State Key Lab of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022 Jilin, China
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214
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Kim IH, Kim MY, Cheong MS, Hah SS. RNA-Mediated Metal-Metal Bond Formation in the Hexagonal Pd Nanoparticle Synthesis is not Influenced by 5'-Thiolation of RNA. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.2.722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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215
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Guan H, Cai M, Chen L, Wang Y, He Z. Label-free DNA sensor based on fluorescent cationic polythiophene for the sensitive detection of hepatitis B virus oligonucleotides. LUMINESCENCE 2011; 25:311-6. [PMID: 19630090 DOI: 10.1002/bio.1151] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Water-soluble fluorescent conjugated polymers can be used as an optical platform in highly sensitive DNA sensors. Here we report a simple label-free DNA sensor using poly(3-alkoxy-4-methylthiophene) to recognize and detect different oligonucleotide targets related to the YMDD gene mutation of hepatitis B virus. The concentration of surfactant Triton X-100, NaCl, the oligonucleotide capture probe and the oligonucleotide hybridization conditions have a great impact on fluorescence intensity. Under the optimum conditions, two types of oligonucleotide targets involving YMDD gene mutation of hepatitis B virus were successfully recognized. Moreover, there was a linear relationship between fluorescence intensity and the concentration of oligonucleotide target. The detection limit of the wild-type hepatitis B virus target is 88 pmol L(-1).
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Affiliation(s)
- Hongliang Guan
- Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), College of Chemistry and Molecular Sciences, Wuhan University, Wuhan 430072, People's Republic of China
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216
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Zhang H, Fang C, Zhang S. An autonomous bio-barcode DNA machine for exponential DNA amplification and its application to the electrochemical determination of adenosine triphosphate. Chemistry 2011; 16:12434-9. [PMID: 20853282 DOI: 10.1002/chem.201000811] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A novel autonomous bio-barcode DNA machine that is driven by template-dependent DNA replication is developed to exponentially amplify special DNA sequences. Combined with a DNA aptamer recognition element, the DNA machine can be further applied in the aptamer-based, amplified analysis of small molecules. As a model analyte, adenosine triphosphate (ATP) is determined by using the DNA machine system in combination with a DNA aptamer recognition strategy and differential pulse anodic stripping voltammetry (DPASV). Under the optimum conditions, detection limits as low as 2.8×10(-17) M (3σ) for target DNA and 4.7×10(-9) M (3σ) for ATP are achieved. The satisfactory determination of ATP in K562 leukemia cell and Ramos Burkitt's lymphoma cell reveal that this protocol possesses good selectivity and practicality. As a promising biomolecular device, this DNA machine may have an even broader application in the rapidly developing field of nanobiotechnology.
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Affiliation(s)
- Hui Zhang
- State Key Laboratory Base of Eco-chemical Engineering, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, Shandong, P. R. China
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217
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Wang J, Zhang Y, Okamoto Y, Kaji N, Tokeshi M, Baba Y. Online transient isotachophoresis concentration by the pseudo-terminating electrolyte buffer for the separation of DNA-aptamer and its thrombin complex in poly(methyl methacrylate) microchip. Analyst 2011; 136:1142-7. [PMID: 21270992 DOI: 10.1039/c0an00434k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Online automatic transient isotachophoresis concentration of DNA-aptamer and its thrombin complex by using one kind of pseudo-terminating electrolyte buffer in a cross-channel poly(methyl methacrylate) microchip is reported. Sample injection, transient concentration and separation were done continuously and controlled by a sequential voltage switching program, time-consuming steps and complicated chip design were not required. Peak resolution between DNA-aptamer and its thrombin complex was influenced by this novel pseudo-terminating electrolyte buffer, which was prepared by the addition of chemical component with slow mobility into the same buffer as leading electrolyte buffer. 1100-fold signal enhancement of thrombin complex was achieved by this transient isotachophoresis on a standard cross-form microchip. The concentration effect or standing time of transient isotachophoresis was proved to be influenced by the concentration of leading electrolyte ion and the concentration of pseudo-terminating electrolyte buffer ion (glycine). The transient concentration was followed by on-chip nondenaturing gel electrophoresis in methylcellulose solution for the size-based separation. The detection limit, taken as the lowest thrombin concentration at threefold S/N, was determined to be 0.5 amol in mass by this method.
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Affiliation(s)
- Jun Wang
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Nagoya, Japan.
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218
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Ma J, Ma X, Deng S, Li F, Hu A. Synthesis of dendronized polymers through bergman cyclization of enediyne-containing Frechet-type dendrimers. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24556] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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219
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Clément S, Tizit A, Desbief S, Mehdi A, De Winter J, Gerbaux P, Lazzaroni R, Boury B. Synthesis and characterisation of π-conjugated polymer/silica hybrids containing regioregular ionic polythiophenes. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm03598j] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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220
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Gehring AG, Tu SI. High-throughput biosensors for multiplexed food-borne pathogen detection. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2011; 4:151-172. [PMID: 21689045 DOI: 10.1146/annurev-anchem-061010-114010] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Incidental contamination of foods by pathogenic bacteria and/or their toxins is a serious threat to public health and the global economy. The presence of food-borne pathogens and toxins must be rapidly determined at various stages of food production, processing, and distribution. Producers, processors, regulators, retailers, and public health professionals need simple and cost-effective methods to detect different species or serotypes of bacteria and associated toxins in large numbers of food samples. This review addresses the desire to replace traditional microbiological plate culture with more timely and less cumbersome rapid, biosensor-based methods. Emphasis focuses on high-throughput, multiplexed techniques that allow for simultaneous testing of numerous samples, in rapid succession, for multiple food-borne analytes (primarily pathogenic bacteria and/or toxins).
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Affiliation(s)
- Andrew G Gehring
- Agricultural Research Service, U.S. Department of Agriculture, Wyndmoor, Pennsylvania 19038, USA
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221
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Functional Nucleic Acids for Fluorescence-Based Biosensing Applications. ADVANCED FLUORESCENCE REPORTERS IN CHEMISTRY AND BIOLOGY III 2011. [DOI: 10.1007/978-3-642-18035-4_6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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222
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Zhang Z, Lu X, Fan Q, Hu W, Huang W. Conjugated polyelectrolyte brushes with extremely high charge density for improved energy transfer and fluorescence quenching applications. Polym Chem 2011. [DOI: 10.1039/c1py00213a] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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223
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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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224
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Zhang XB, Kong RM, Lu Y. Metal ion sensors based on DNAzymes and related DNA molecules. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2011; 4:105-28. [PMID: 21370984 PMCID: PMC3119750 DOI: 10.1146/annurev.anchem.111808.073617] [Citation(s) in RCA: 241] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Metal ion sensors are an important yet challenging field in analytical chemistry. Despite much effort, only a limited number of metal ion sensors are available for practical use because sensor design is often a trial-and-error-dependent process. DNAzyme-based sensors, in contrast, can be developed through a systematic selection that is generalizable for a wide range of metal ions. Here, we summarize recent progress in the design of DNAzyme-based fluorescent, colorimetric, and electrochemical sensors for metal ions, such as Pb(2+), Cu(2+), Hg(2+), and UO(2)(2+). In addition, we also describe metal ion sensors based on related DNA molecules, including T-T or C-C mismatches and G-quadruplexes.
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Affiliation(s)
- Xiao-Bing Zhang
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Rong-Mei Kong
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China
| | - Yi Lu
- Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
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225
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Qi Y, Li B. A sensitive, label-free, aptamer-based biosensor using a gold nanoparticle-initiated chemiluminescence system. Chemistry 2010; 17:1642-8. [PMID: 21268167 DOI: 10.1002/chem.201001856] [Citation(s) in RCA: 88] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2010] [Indexed: 11/06/2022]
Abstract
We report a label-free, aptamer-based chemiluminescent biosensor. The biosensor relies upon the catalytic activity of unmodified gold nanoparticles (AuNPs) on the luminol-H(2)O(2) chemiluminescence (CL) reaction, and the interaction of unmodified AuNPs with the aptamer. The unmodified AuNPs can effectively differentiate unstructured and folded aptamer. The binding of the aptamer with the target can induce the AuNP aggregation in the presence of 0.5 M NaCl, and after aggregation the catalytic activity of the AuNPs on the luminol-H(2)O(2) CL reaction is greatly enhanced. During the assay, no covalent functionalization of the AuNPs or aptamer is required. The detection limit of thrombin was estimated to be as low as 26 fM, and the sensitivity was more than 4 orders of magnitude better than that of known AuNP-based colorimetric methods for the detection of thrombin. This aptamer-based biosensor offers the advantages of being simple, cheap, rapid, and sensitive.
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Affiliation(s)
- Yingying Qi
- Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062, P.R. China
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226
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An aptamer-based chromatographic strip assay for sensitive toxin semi-quantitative detection. Biosens Bioelectron 2010; 26:3059-62. [PMID: 21167704 DOI: 10.1016/j.bios.2010.11.040] [Citation(s) in RCA: 107] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2010] [Revised: 11/24/2010] [Accepted: 11/25/2010] [Indexed: 11/22/2022]
Abstract
An aptamer-based chromatographic strip assay method for rapid toxin detection was developed. The aptamer-based strip assay was based on the competition for the aptamer between ochratoxin A and DNA probes. The sensing results indicated that the sensitivity of the aptamer-based strip was better than that of conventional antibody-based strips. The visual limit of detection of the strip for qualitative detection was 1 ng/mL while the LOD for semi-quantitative detection could down to 0.18 ng/mL by using scanning reader. The recoveries of test samples were from 96% to 110%. All detections could be achieved in less than 10 min, indicating that the aptamer-based strip could be a potential useful tool for rapid on-site detections.
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227
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Wang L, Chen W, Ma W, Liu L, Ma W, Zhao Y, Zhu Y, Xu L, Kuang H, Xu C. Fluorescent strip sensor for rapid determination of toxins. Chem Commun (Camb) 2010; 47:1574-6. [PMID: 21116526 DOI: 10.1039/c0cc04032k] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Here, we report a simple fluorescent strip sensor based on aptamer-quantum dots technology that can meet toxin monitoring demands using ochratoxin A (OTA) as a model toxin. The limit of the detection (LOD) for the fluorescent strip was 1.9 ng mL(-1), while the time needed for the detection is only 10 min; this conforms to the standards of World Health Organization (WHO) or better. Overall functional parameters are also better than the analogous characteristics of gold nanoparticle strips. High selectivity was maintained as well, making them suitable for the samples with complex solution composition.
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Affiliation(s)
- Libing Wang
- School of Food Science & Technology, State Key Lab of Food Science & Technology, Jiangnan University, Wuxi, 214122, PRC
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228
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Ge B, Huang YC, Sen D, Yu HZ. A Robust Electronic Switch Made of Immobilized Duplex/Quadruplex DNA. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201004946] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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229
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Ge B, Huang YC, Sen D, Yu HZ. A Robust Electronic Switch Made of Immobilized Duplex/Quadruplex DNA. Angew Chem Int Ed Engl 2010; 49:9965-7. [DOI: 10.1002/anie.201004946] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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230
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Pu KY, Shi J, Wang L, Cai L, Wang G, Liu B. Mannose-Substituted Conjugated Polyelectrolyte and Oligomer as an Intelligent Energy Transfer Pair for Label-Free Visual Detection of Concanavalin A. Macromolecules 2010. [DOI: 10.1021/ma1021264] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Kan-Yi Pu
- Department of Chemical and Biomolecular Engineering, 4 Engineering Drive 4, National University of Singapore, Singapore 117576, Singapore
| | - Jianbing Shi
- Department of Chemical and Biomolecular Engineering, 4 Engineering Drive 4, National University of Singapore, Singapore 117576, Singapore
- College of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
| | - Lihua Wang
- Department of Chemical and Biomolecular Engineering, 4 Engineering Drive 4, National University of Singapore, Singapore 117576, Singapore
- Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - Liping Cai
- Department of Chemical and Biomolecular Engineering, 4 Engineering Drive 4, National University of Singapore, Singapore 117576, Singapore
| | - Guan Wang
- Department of Chemical and Biomolecular Engineering, 4 Engineering Drive 4, National University of Singapore, Singapore 117576, Singapore
| | - Bin Liu
- Department of Chemical and Biomolecular Engineering, 4 Engineering Drive 4, National University of Singapore, Singapore 117576, Singapore
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231
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Xu H, Gao S, Yang Q, Pan D, Wang L, Fan C. Amplified fluorescent recognition of g-quadruplex folding with a cationic conjugated polymer and DNA intercalator. ACS APPLIED MATERIALS & INTERFACES 2010; 2:3211-3216. [PMID: 21028820 DOI: 10.1021/am1006854] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The single stranded DNA (ssDNA) with G-rich sequence can fold into G-quadruplex via intramolecular hydrogen-bonding interaction in the presence of ligand. This structure conversion can be specifically detected by a fluorescence method based on different interaction between SYBR Green I (SG) and various DNA structures. SG is proved to intercalate into G-quadruplex and results in high fluorescence intensity, which can be further amplified by 6-fold through fluorescence resonance energy transfer (FRET) from a water-soluble cationic conjugated polymer (CCP) to SG due to the high affinity of positively charged CCP to negatively charged rigid G-quadruplex, whereas it is not performed for ssDNA in the absence of K(+). As a result, the ssDNA/SG/CCP complex can be used to detect potassium ions with improved selectivity in a label-free and cost-effective manner.
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Affiliation(s)
- Hui Xu
- School of Chemistry and Material Sciences, Ludong University, Yantai 264025, China
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232
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Abstract
Aptamers are DNA or RNA oligonucleotides that can bind with high affinity and specificity to a wide range of targets such as proteins, metal ions or pathogenic microorganisms. Soluble aptamers and aptazymes have been used as sensing elements for developing homogeneous assays in a solution phase, the whole sensing process being carried out in a homogeneous solution. Contrary to most conventional heterogeneous assays that are time-consuming and labor-intensive, aptamer-based homogeneous assays are simple, easy-to-perform, rapid and do not require immobilization nor washing steps. To our knowledge, this review is the first entirely dedicated to aptamer-based homogeneous assays. Optical detection appears as the most developed technique. Colorimetry represents the simplest sensing mode that occupies a very important position among aptamer-based assays, involving gold nanoparticle aggregation (with unmodified or aptamer-modified gold NPs), the formation of HRP-mimicking DNAzyme with hemin, dye displacement or interactions with a cationic polymer. Fluorescence that is highly sensitive offers the most developed detection mode. Aptamers can be labeled or not, to give rise to turn-on or usually less sensitive turn-off fluorescent assays. Newly reported and thus less developed non-conventional magnetic resonance imaging (MRI) and electrochemistry also recently appeared in the literature, thrombin still remains the main detected target. Homogeneous assays based on aptazyme, an aptamer sequence connected to a known ribozyme motif, are also described in this review, involving optical detection, by colorimetry or fluorescence.
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Affiliation(s)
- Audrey Sassolas
- CNRS, UMR 5246, ICBMS, Institut de Chimie et Biochimie Moléculaires et Supramoléculaires, Génie Enzymatique, Membranes Biomimétiques et Assemblages Supramoléculaires (GEMBAS), Université Lyon 1, Bât CPE, 43 boulevard du 11 novembre 1918, Villeurbanne, F-69622, France
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233
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Zhao J, Zhang Y, Li H, Wen Y, Fan X, Lin F, Tan L, Yao S. Ultrasensitive electrochemical aptasensor for thrombin based on the amplification of aptamer-AuNPs-HRP conjugates. Biosens Bioelectron 2010; 26:2297-303. [PMID: 21030239 DOI: 10.1016/j.bios.2010.09.056] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2010] [Revised: 09/25/2010] [Accepted: 09/30/2010] [Indexed: 10/19/2022]
Abstract
Successful development of an ultrasensitive and highly specific electrochemical aptasensor for thrombin based on amplification of aptamer-gold nanoparticles-horseradish peroxidase (aptamer-AuNPs-HRP) conjugates was reported. In this electrochemical protocol, aptamer1 (Apt1) was immobilized on core/shell Fe(3)O(4)/Au magnetic nanoparticles (AuMNPs) and served as capture probe. Aptamer2 (Apt2) was dual labeled with AuNPs and HRP and used as detection probe. In the presence of thrombin, the sandwich format of AuMNPs-Apt1/thrombin/Apt2-AuNPs-HRP was fabricated. Remarkable signal amplification was realized by taking the advantage of AuNPs and catalytic reactions of HRP. Other proteins, such as human serum albumin, lysozyme, fibrinogen, and IgG did not show significant interference with the assay for thrombin. Linear response to thrombin concentration in the range of 0.1-60 pM and lower detection limit down to 30 fM (S/N=3) was obtained with the proposed method. This electrochemical aptasensor is simple, rapid (the whole detection period for a thrombin sample is less than 35 min), sensitive and highly specific, it shows promising potential in protein detection and disease diagnosis.
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Affiliation(s)
- Jie Zhao
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University, Changsha 410081, PR China
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234
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Wang G, Chen Z, Wang W, Yan B, Chen L. Chemical redox-regulated mesoporous silica-coated gold nanorods for colorimetric probing of Hg2+ and S2-. Analyst 2010; 136:174-8. [PMID: 20877888 DOI: 10.1039/c0an00597e] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The past a few years have witnessed the wide use of metallic nanoparticles as ideal reporters for colorimetric detection, which generally involves an analyte-triggered alteration of aggregation degree of applied nanoparticles, and thus the change of colloidal color. However, these aggregation-based colorimetric probe are associated with a number of drawbacks, including poor stability of nanoaggregates, requirement of complicated functionalization and non-linearity of output signals. To address these problems, we herein employ mesoporous silica-coated gold nanorods (MS AuNRs) as novel nanocomposites for non-aggregation-based label-free colorimetric sensing relying on their chemical redox-modulated surface chemistry. In our sensing system, Hg(2+) ions are reduced to Hg(0) depositing on the surface of MS AuNPs and result in a great color change of MS AuNRs, while the subsequent introduction of S(2-) leads to a reverse process owing to the extraction of Hg(0) by S(2-). The experimental results for colorimetric sensing of Hg(2+) and S(2-) imply considerable sensitivity and specificity, suggesting the high potential of our approach for rapid environmental monitoring and bioanalysis in the future.
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Affiliation(s)
- Guoqing Wang
- Key Laboratory of Coastal Environmental Processes, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, 17 Chunhui Road, Yantai 264003, China
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235
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Yeung MCL, Wong KMC, Tsang YKT, Yam VWW. Aptamer-induced self-assembly of a NIR-emissive platinum(II) terpyridyl complex for label- and immobilization-free detection of lysozyme and thrombin. Chem Commun (Camb) 2010; 46:7709-11. [PMID: 20871876 DOI: 10.1039/c0cc02631j] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
With the aptamer-induced self-assembly feature of NIR-emissive platinum(ii) terpyridyl complex, a "proof-of-principle" concept in label- and immobilization-free probing strategies of lysozyme and thrombin has been demonstrated with good selectivity and specificity.
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Affiliation(s)
- Margaret Ching-Lam Yeung
- Institute of Molecular Functional Materials (Areas of Excellence Scheme, University Grants Committee, Hong Kong) and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, PR China
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236
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Li B, Dong S, Wang E. Homogeneous analysis: label-free and substrate-free aptasensors. Chem Asian J 2010; 5:1262-72. [PMID: 20408164 DOI: 10.1002/asia.200900660] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In this Focus Review, we introduce a kind of "label-free" and "substrate-free" (LFSF) aptasensor that carries out the whole sensing process in a homogeneous solution. This means that commonly used covalent label; separation, and immobilization steps in biosensors are successfully avoided, which simplifies the sensing operations to the greatest degree. After brief description about the advantages of aptamers and "LFSF" aptasensors, the main content of the review is divided into fluorescent aptasenors, calorimetric aptasensors, and hemin-aptamer-DNAzyme "LFSF" aptasensors, which are three most widely developed sensing systems in this field. It is hoped that this review can provide an overall scene about how aptamers function as ideal recognition elements in smart analysis.
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Affiliation(s)
- Bingling Li
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022 P. R. China
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237
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Zhang S, Hu R, Hu P, Wu ZS, Shen GL, Yu RQ. Blank peak current-suppressed electrochemical aptameric sensing platform for highly sensitive signal-on detection of small molecule. Nucleic Acids Res 2010; 38:e185. [PMID: 20724441 PMCID: PMC2978380 DOI: 10.1093/nar/gkq728] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
In this contribution, an electrochemical aptameric sensing scheme for the sensitive detection of small molecules is proposed using adenosine as a target model. A ferrocene (Fc)-functionalized thiolated aptamer probe is adapted and immobilized onto an electrode surface. Introducing a recognition site for EcoRI into the aptamer sequence not only suppresses the peak current corresponding to blank sample but also provides a signal-on response mechanism. In the absence of adenosine, the aptamer can fold into a hairpin structure and form a cleavable double-stranded region. Fc is capable of being removed from electrode surface by treatment with endonuclease, and almost no peak current is observed. The adenosine/aptamer binding induces the conformational transition of designed aptamer, dissociating the cleavable double-stranded segment. Therefore, the integrated aptamer sequence is maintained when exposing to endonuclease, generating a peak current of Fc. Utilizing the present sensing scheme, adenosine even at a low concentration can give a detectable current signal. Thus, a detection limit of 10−10 M and a linear response range from 3.74 × 10−9 to 3.74 × 10−5 M are achieved. The proposed proof-of-principle of a novel electrochemical sensing is expected to extend to establish various aptameric platforms for the analysis of a broad range of target molecules of interest.
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Affiliation(s)
- Songbai Zhang
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China
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238
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Shin SM, Kim YS, Kang HJ, Hah SS. Quantum Dot-Based Aptasensor for Sensitive Protein Detection. B KOREAN CHEM SOC 2010. [DOI: 10.5012/bkcs.2010.31.7.2091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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239
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240
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Rahman MA, Son JI, Won MS, Shim YB. Gold nanoparticles doped conducting polymer nanorod electrodes: ferrocene catalyzed aptamer-based thrombin immunosensor. Anal Chem 2010; 81:6604-11. [PMID: 20337374 DOI: 10.1021/ac900285v] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Au nanoparticles-doped conducting polymer nanorods electrodes (AuNPs/CPNEs) were prepared by coating Au nanorods (AuNRs) with a conducting polymer layer. The AuNRs were prepared through an electroless deposition method using the polycarbonate membrane (pore diameter, 50 nm, pore density, 6 x 10(8) pores/cm(2)) as a template. The AuNPs/CPNEs combining catalytic activity of ferrocene to ascorbic acid were used for the fabrication of an ultrasensitive aptamer sensor for thrombin detection. The AuNPs/3D-CPNEs were characterized employing cyclic voltammetry (CV), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and atomic force microscopy (AFM). Sandwiched immunoassay for alpha-human thrombin with NH(2)-functionalized-thrombin binding aptamer (Apt) immobilized on AuNPs/3D-CPNEs was studied through the electrocatalytic oxidation of ascorbic acid by the ferrocene moiety that was bound with an antithrombin antibody and attached with the Apt/3D-CPNEs probe through target binding. Various experimental parameters affecting thrombin detection were optimized, and the performance of the thrombin aptamer sensor was examined. The Apt/AuNPs/3D-CPNEs based thrombin sensor exhibited a wide dynamic range of 5-2000 ng L(-1) and a low detection limit of 5 ng L(-1) (0.14 pM). The selectivity and the stability of the proposed thrombin aptamer sensor were excellent, and it was tested in a real human serum sample for the detection of spiked concentrations of thrombin.
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Affiliation(s)
- Md Aminur Rahman
- Department of Chemistry, Pusan National University, Pusan 609-735, South Korea
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241
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Wang Y, Pu KY, Liu B. Anionic conjugated polymer with aptamer-functionalized silica nanoparticle for label-free naked-eye detection of lysozyme in protein mixtures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:10025-30. [PMID: 20491465 DOI: 10.1021/la100139p] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
An assay triggered by recognition-induced charge switching is developed for protein detection and quantification. Aptamer-functionalized silica nanoparticles (NPs) have been synthesized to capture lysozyme, resulting in an alternation of the surface charge from negative to partially positive. The binding event is then translated and monitored by the fluorescence signal of a highly fluorescent anionic poly(fluorene-alt-vinylene) (PFVSO(3)), which "stains" on protein/aptamer-NP complexes via electrostatic interaction. Blue-greenish fluorescence of PFVSO(3) is observed in the presence of lysozyme by the naked eye, while no fluorescence is obtained for NPs upon treatment with a mixture of foreign proteins. A linear relationship between NP fluorescence and lysozyme is observed in the concentration range of 0-22.5 microg/mL, which gives a limit of detection as approximately 0.36 microg/mL. This work demonstrates a convenient label-free conjugated polyelectrolyte (CPE)-based protein detection with high specificity and sensitivity, which has potential applications in medical diagnosis.
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Affiliation(s)
- Yanyan Wang
- Department of Chemical and Biomolecular Engineering, 4 Engineering Drive 4, National University of Singapore, 117576 Singapore
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242
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Lin Z, Chen L, Zhu X, Qiu B, Chen G. Signal-on electrochemiluminescence biosensor for thrombin based on target-induced conjunction of split aptamer fragments. Chem Commun (Camb) 2010; 46:5563-5. [PMID: 20532276 DOI: 10.1039/c0cc00932f] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A highly sensitive and selective electrochemiluminescence biosensor for detection of thrombin based on the strategy of target-induced conjunction of split aptamer fragments was developed.
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Affiliation(s)
- Zhenyu Lin
- Ministry of Education Key Laboratory of Analysis and Detection for Food Safety, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, Department of Chemistry, Fuzhou University, Fuzhou, Fujian 350002, China
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243
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Gou XC, Liu J, Zhang HL. Monitoring human telomere DNA hybridization and G-quadruplex formation using gold nanorods. Anal Chim Acta 2010; 668:208-14. [DOI: 10.1016/j.aca.2010.04.027] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2010] [Revised: 04/10/2010] [Accepted: 04/13/2010] [Indexed: 10/19/2022]
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244
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Li N. Detection of Non-Nucleic Acid Targets with an Unmodified Aptamer and a Fluorogenic Competitor. ACTA ACUST UNITED AC 2010; 15:189-197. [PMID: 20563298 DOI: 10.1016/j.jala.2010.02.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Aptamers are oligonucleotides that can bind to various non-nucleic acid targets, ranging from proteins to small molecules, with a specificity and affinity comparable to that of antibodies. Most aptamer-based detection strategies require modification on the aptamer, which could lead to a significant loss in its affinity and specificity to the target. Here we reported a generic strategy to design aptamer-based optical probes. An unmodified aptamer specific to the target and a fluorogenic competitor complementary to the aptamer are utilized for target recognition and signal generation, respectively. The competitor is a hairpin oligonucleotide with a fluorophore attached on one end and a quencher attached on the other. When no target is present, the competitor binds to the aptamer. However, when the target is introduced, the competitor will be displaced from the aptamer by the target, thus resulting in a target-specific decrease in fluorescence signal. Successful application of this strategy to different types of targets (small molecules and proteins) as well as different types of aptamers (DNA and RNA) has been demonstrated. Furthermore, a thermodynamics-based prediction model was established to further rationalize the optimization process. Due to its rapidness and simplicity, this aptamer-based detection strategy holds great promise in high throughput applications.
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Affiliation(s)
- Na Li
- University of Miami, Coral Gables, FL
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245
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Feng F, Liu L, Yang Q, Wang S. Water-Soluble Conjugated Polymers for Fluorescent-Enzyme Assays. Macromol Rapid Commun 2010; 31:1405-21. [DOI: 10.1002/marc.201000020] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2010] [Revised: 02/25/2010] [Indexed: 11/08/2022]
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246
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Jin Y, Bai J, Li H. Label-free protein recognition using aptamer-based fluorescence assay. Analyst 2010; 135:1731-5. [PMID: 20467654 DOI: 10.1039/c0an00014k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Monitoring proteins in real time and in homogeneous solution without using external labels has always been a difficult task. In this paper, we have developed a label-free method for the ultrasensitive detection of thrombin in homogeneous solutions. High-affinity thrombin-binding aptamer (TBA) used as molecular recognition probe, and fluorophore, crystal violet (CV), was chose as fluorescence signal probe. The fluorescence of CV enhanced significantly when the free CV solution was mixed with single-stranded TBA. In the presence of human thrombin, the fluorescence of CV decreased after the specific interaction between TBA and thrombin. Using the fluorescence change, we are able to selectively detect the thrombin in homogeneous solutions. The conformation transformation was investigated by circular dichroism (CD) spectra measurements. Our method has been shown to be simple and effective without any labelling of the probe or of the target, and this procedure poses minimum effects on the binding properties of the proteins. This assay is highly selective and ultrasensitive. Under the optimum conditions, the method exhibits a dynamic response range from 2 x 10(-11) to 2 x 10(-9) M with a detection limit of 8 x 10(-12) M.
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Affiliation(s)
- Yan Jin
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, Key Laboratory of Analytical Chemistry for Life Science of Shaanxi Province, School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an, 710062, China.
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247
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Molecular diagnostic and drug delivery agents based on aptamer-nanomaterial conjugates. Adv Drug Deliv Rev 2010; 62:592-605. [PMID: 20338204 DOI: 10.1016/j.addr.2010.03.003] [Citation(s) in RCA: 242] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2009] [Accepted: 02/03/2010] [Indexed: 12/16/2022]
Abstract
Recent progress in an emerging area of designing aptamer and nanomaterial conjugates as molecular diagnostic and drug delivery agents in biomedical applications is summarized. Aptamers specific for a wide range of targets are first introduced and compared to antibodies. Methods of integrating these aptamers with a variety of nanomaterials, such as gold nanoparticles, quantum dots, carbon nanotubes, and superparamagnetic iron oxide nanoparticles, each with unique optical, magnetic, and electrochemical properties, are reviewed. Applications of these systems as fluorescent, colorimetric, magnetic resonance imaging, and electrochemical sensors in medical diagnostics are given, along with new applications as smart drug delivery agents.
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248
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Shin S, Kim IH, Kang W, Yang JK, Hah SS. An alternative to Western blot analysis using RNA aptamer-functionalized quantum dots. Bioorg Med Chem Lett 2010; 20:3322-5. [PMID: 20457520 DOI: 10.1016/j.bmcl.2010.04.040] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2010] [Accepted: 04/10/2010] [Indexed: 10/19/2022]
Abstract
To make full use both of optical properties of quantum dots (QDs) and of specific interactions between aptamers and their ligands of interest, we employed QD-conjugated RNA aptamer interactions with histidine tag. QDs offer revolutionary fluorescence performance due to their long-term photostability, brilliant colors, fixability, and narrow, symmetrical emission spectra, and aptamers are known to specifically bind to their target molecules, including metal ions, small molecules, and macromolecules. In this study, we have synthesized RNA aptamer-functionalized QDs, and demonstrated their application to specific protein detection, as an alternative to the conventional Western blot analysis. We observed that our RNA aptamer-functionalized QD system dramatically reduced the time and effort required for conventional Western blot analysis, whereas the selectivity was comparable to that of the conventionally available anti-histidine tag antibody and the sensitivity was comparable to that of the Coomassie blue staining method. In principle, owing to the remarkable optical properties of QDs and a wide versatility of aptamers for selection, our system can harness the high brightness, stability and reusability to quantitatively detect aptamer-recognizable proteins. Furthermore, multiplex detection for several proteins on a single blot can be achieved by our new method, which thus may be able to facilitate and simplify the routinely used protein detection procedure, and make a variety of proteomics analysis possible.
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Affiliation(s)
- Seonmi Shin
- Department of Chemistry and Research Institute for Basic Sciences, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, South Korea
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249
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Huang H, Tan Y, Shi J, Liang G, Zhu JJ. DNA aptasensor for the detection of ATP based on quantum dots electrochemiluminescence. NANOSCALE 2010; 2:606-612. [PMID: 20644766 DOI: 10.1039/b9nr00393b] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A novel and facile strategy for the fabrication of aptamer-based adenosine 5'-triphosphate (ATP) biosensor was developed by a quantum dot (QD) electrochemiluminescence (ECL) technique. Different from the existing strategies for the development of aptasensors based on electrochemical, fluorescent or other methods, the strategy proposed here is essentially based on the aptamer-ATP specific affinity and the rules of Watson-Crick base pairing. After the thiol modified anti-ATP probes were immobilized onto the pretreated Au electrode, the electrode was incubated in ATP solution to form aptamer-ATP bioaffinity complexes. The complementary DNA (cDNA) oligonucleotides were hybridized with the free probes. As a result, the avidin-modified QDs were bound to the aptasensor through the biotin-avidin system in the existence of biotin-modified cDNA. The ECL signal of the aptasensor was responsive to the amount of QDs bound to the cDNA oligonucleotides, which was inversely proportional to the combined target analyte ATP. The QDs were characterized by high resolution transmission electron microscopy (HRTEM), ultraviolet (UV) and photoluminescence (PL) spectra. The preparation process for the aptasensor was monitored by electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV). Possible interference, such as from the pH value of the electrolyte, the incubation time and the concentration of coreactant K(2)S(2)O(8), on the aptasensor ECL response were investigated. The ATP concentration was measured through the decrease of ECL intensity. The ECL intensity of the aptasensor decreased with the increase of the logarithm of the ATP concentration over the 0.018-90.72 microM range. In addition, the aptasensor exhibited excellent selectivity responses toward the target analyte. This study may offer a new and relatively general approach to expand the application of QD ECL in the aptasensor field.
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Affiliation(s)
- Haiping Huang
- Key Lab of Analytical Chemistry for Life Science (MOE), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, PR China
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Li T, Fu R, Park HG. Pyrrolo-dC based fluorescent aptasensors for the molecular recognition of targets. Chem Commun (Camb) 2010; 46:3271-3. [PMID: 20442883 DOI: 10.1039/b923462d] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel signal-on fluorescent aptasensors based on unlabeled aptamers and pyrrolo-dC have been developed for the detection of several targets with great specificity and sensitivity.
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Affiliation(s)
- Taihua Li
- Department of Chemical and Biomolecular Engineering, KAIST, 335 Gwahak-ro, Yuseong-gu, Daejeon, 305-701, Republic of Korea
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