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Wang Y, Xu Y, Jiang R, Dong Q, Sun Y, Li W, Xiong Y, Chen Y, Yi S, Wen Q. A fluorescent probe based on aptamer gold nanoclusters for rapid detection of mercury ions. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2023; 15:3893-3901. [PMID: 37519193 DOI: 10.1039/d3ay00967j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/01/2023]
Abstract
The mercuric ion (Hg2+) is a hazardous pollutant that is widely distributed in living organisms, foods, and environments with highly toxic and bio-accumulative properties. In the present study, a fluorescent probe based on aptamer gold nanoclusters (apt-AuNCs) was prepared for the ultrasensitive detection of Hg2+ in food. The principle underlying the prepared probe was the quenching of the fluorescence of apt-AuNCs in the presence of Hg2+ due to the strong metallophilic interactions between the 5d10 centers of Hg2+ and Au+. Under optimal conditions, the proposed fluorescent probe exhibited a linear relationship with Hg2+ concentration within the range of 2-200 nM (R2 = 0.9960). In addition, the limit of detection (LOD) was 0.0158 nM, which is below the Chinese standard value of 25 nM for Hg2+ in food. Furthermore, the apt-AuNCs were applied to detect Hg2+ in spinach and crawfish samples, with recovery percentages of 91.99%∼108.06%, meaning that apt-AuNCs could be used as a promising probe to detect Hg2+ in complex food samples.
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Affiliation(s)
- Ying Wang
- National Engineering Laboratory for Deep Processing of Rice and By-products, Hunan Key Laboratory of Processed Food for Special Medical Purpose, Hunan Key Laboratory of Forestry Edible Sources Safety and Processing, College of Food Science and Engineering, Central South University of Forestry and Technology, Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning, Hunan Institute Food Quality Supervision Inspection and Research, Changsha 410004, PR China.
| | - Yinyu Xu
- Research Institute of Commodity Quality Inspection in Hunan, Changsha, 410004, PR China
| | - Ruina Jiang
- National Engineering Laboratory for Deep Processing of Rice and By-products, Hunan Key Laboratory of Processed Food for Special Medical Purpose, Hunan Key Laboratory of Forestry Edible Sources Safety and Processing, College of Food Science and Engineering, Central South University of Forestry and Technology, Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning, Hunan Institute Food Quality Supervision Inspection and Research, Changsha 410004, PR China.
| | - Quanyong Dong
- National Engineering Laboratory for Deep Processing of Rice and By-products, Hunan Key Laboratory of Processed Food for Special Medical Purpose, Hunan Key Laboratory of Forestry Edible Sources Safety and Processing, College of Food Science and Engineering, Central South University of Forestry and Technology, Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning, Hunan Institute Food Quality Supervision Inspection and Research, Changsha 410004, PR China.
| | - Yingying Sun
- National Engineering Laboratory for Deep Processing of Rice and By-products, Hunan Key Laboratory of Processed Food for Special Medical Purpose, Hunan Key Laboratory of Forestry Edible Sources Safety and Processing, College of Food Science and Engineering, Central South University of Forestry and Technology, Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning, Hunan Institute Food Quality Supervision Inspection and Research, Changsha 410004, PR China.
| | - Wang Li
- National Engineering Laboratory for Deep Processing of Rice and By-products, Hunan Key Laboratory of Processed Food for Special Medical Purpose, Hunan Key Laboratory of Forestry Edible Sources Safety and Processing, College of Food Science and Engineering, Central South University of Forestry and Technology, Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning, Hunan Institute Food Quality Supervision Inspection and Research, Changsha 410004, PR China.
| | - Ying Xiong
- National Engineering Laboratory for Deep Processing of Rice and By-products, Hunan Key Laboratory of Processed Food for Special Medical Purpose, Hunan Key Laboratory of Forestry Edible Sources Safety and Processing, College of Food Science and Engineering, Central South University of Forestry and Technology, Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning, Hunan Institute Food Quality Supervision Inspection and Research, Changsha 410004, PR China.
| | - Yanni Chen
- National Engineering Laboratory for Deep Processing of Rice and By-products, Hunan Key Laboratory of Processed Food for Special Medical Purpose, Hunan Key Laboratory of Forestry Edible Sources Safety and Processing, College of Food Science and Engineering, Central South University of Forestry and Technology, Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning, Hunan Institute Food Quality Supervision Inspection and Research, Changsha 410004, PR China.
| | - Sili Yi
- School of Chemistry and Materials Science, Huaihua University, Huaihua, 418000, PR China.
| | - Qian Wen
- National Engineering Laboratory for Deep Processing of Rice and By-products, Hunan Key Laboratory of Processed Food for Special Medical Purpose, Hunan Key Laboratory of Forestry Edible Sources Safety and Processing, College of Food Science and Engineering, Central South University of Forestry and Technology, Hunan Provincial Key Laboratory of Food Safety Monitoring and Early Warning, Hunan Institute Food Quality Supervision Inspection and Research, Changsha 410004, PR China.
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Rahbarimehr E, Chao HP, Churcher ZR, Slavkovic S, Kaiyum YA, Johnson PE, Dauphin-Ducharme P. Finding the Lost Dissociation Constant of Electrochemical Aptamer-Based Biosensors. Anal Chem 2023; 95:2229-2237. [PMID: 36638814 DOI: 10.1021/acs.analchem.2c03566] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Electrochemical aptamer-based (E-AB) biosensors afford real-time measurements of the concentrations of molecules directly in complex matrices and in the body, offering alternative strategies to develop innovative personalized medicine tools. While different electroanalytical techniques have been used to interrogate E-AB sensors (i.e., cyclic voltammetry, electrochemical impedance spectroscopy, and chronoamperometry) to resolve the change in electron transfer of the aptamer's covalently attached redox reporter, square-wave voltammetry remains a widely used technique due to its ability to maximize the redox reporter's faradic contribution to the measured current. Several E-AB sensors interrogated with this technique, however, show lower aptamer affinity (i.e., μM-mM) even in the face of employing aptamers that have high affinities (i.e., nM-μM) when characterized using solution techniques such as isothermal titration calorimetry (ITC) or fluorescence spectroscopy. Given past reports showing that E-AB sensor's response is dependent on square-wave interrogation parameters (i.e., frequency and amplitude), we hypothesized that the difference in dissociation constants measured with solution techniques stemmed from the electrochemical interrogation technique itself. In response, we decided to compare six dissociation constants of aptamers when characterized in solution with ITC and when interrogated on electrodes with electrochemical impedance spectroscopy, a technique able to, in contrast to square-wave voltammetry, deconvolute and quantify E-AB sensors' contributions to the measured current. In doing so, we found that we were able to measure dissociation constants that were either separated by 2-3-fold or within experimental errors. These results are in contrast with square-wave voltammetry-measured dissociation constants that are at the most separated by 2-3 orders of magnitude from ones measured by ITC. We thus envision that the versatility and time scales covered by electrochemical impedance spectroscopy offer the highest sensitivity to measure target binding in electrochemical biosensors relying on changes in electron-transfer rates.
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Affiliation(s)
- Erfan Rahbarimehr
- Département de chimie, Université de Sherbrooke, Sherbrooke, QuébecJ1K 2R1, Canada
| | - Hoi Pui Chao
- Department of Chemistry, York University, 4700 Keele Street, Toronto, OntarioM3J 1P3, Canada
| | - Zachary R Churcher
- Department of Chemistry, York University, 4700 Keele Street, Toronto, OntarioM3J 1P3, Canada
| | - Sladjana Slavkovic
- Department of Chemistry, York University, 4700 Keele Street, Toronto, OntarioM3J 1P3, Canada
| | - Yunus A Kaiyum
- Department of Chemistry, York University, 4700 Keele Street, Toronto, OntarioM3J 1P3, Canada
| | - Philip E Johnson
- Department of Chemistry, York University, 4700 Keele Street, Toronto, OntarioM3J 1P3, Canada
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Pellitero MA, Curtis SD, Arroyo-Currás N. Interrogation of Electrochemical Aptamer-Based Sensors via Peak-to-Peak Separation in Cyclic Voltammetry Improves the Temporal Stability and Batch-to-Batch Variability in Biological Fluids. ACS Sens 2021; 6:1199-1207. [PMID: 33599479 DOI: 10.1021/acssensors.0c02455] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Electrochemical, aptamer-based (E-AB) sensors support continuous, real-time measurements of specific molecular targets in complex fluids such as undiluted serum. They achieve these measurements by using redox-reporter-modified, electrode-attached aptamers that undergo target binding-induced conformational changes which, in turn, change electron transfer between the reporter and the sensor surface. Traditionally, E-AB sensors are interrogated via pulse voltammetry to monitor binding-induced changes in transfer kinetics. While these pulse techniques are sensitive to changes in electron transfer, they also respond to progressive changes in the sensor surface driven by biofouling or monolayer desorption and, consequently, present a significant drift. Moreover, we have empirically observed that differential voltage pulsing can accelerate monolayer desorption from the sensor surface, presumably via field-induced actuation of aptamers. Here, in contrast, we demonstrate the potential advantages of employing cyclic voltammetry to measure electron-transfer changes directly. In our approach, the target concentration is reported via changes in the peak-to-peak separation, ΔEP, of cyclic voltammograms. Because the magnitude of ΔEP is insensitive to variations in the number of aptamer probes on the electrode, ΔEP-interrogated E-AB sensors are resistant to drift and show decreased batch-to-batch and day-to-day variability in sensor performance. Moreover, ΔEP-based measurements can also be performed in a few hundred milliseconds and are, thus, competitive with other subsecond interrogation strategies such as chronoamperometry but with the added benefit of retaining sensor capacitance information that can report on monolayer stability over time.
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Affiliation(s)
- Miguel Aller Pellitero
- Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland 21202, United States
| | - Samuel D. Curtis
- Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland 21202, United States
| | - Netzahualcóyotl Arroyo-Currás
- Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland 21202, United States
- Department of Chemical and Biomolecular Engineering, Whiting School of Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
- Institute for Nanobiotechnology, Johns Hopkins University, Baltimore, Maryland 21218, United States
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Shi Y, Li W, Feng X, Lin L, Nie P, Shi J, Zou X, He Y. Sensing of mercury ions in Porphyra by Copper @ Gold nanoclusters based ratiometric fluorescent aptasensor. Food Chem 2020; 344:128694. [PMID: 33277121 DOI: 10.1016/j.foodchem.2020.128694] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2020] [Revised: 10/27/2020] [Accepted: 11/18/2020] [Indexed: 12/23/2022]
Abstract
A novel aptamer-modified Copper @ Gold nanoclusters (apt-Cu@Au NCs) based ratiometric fluorescent probe was developed for mercury ions (Hg2+) determination in Porphyra. The apt-Cu@Au NCs were well dispersed in solution without Hg2+ but combined together for the formation of thymidine-Hg-thymidine structure with the addition of Hg2+, which further caused the changes in their fluorescence intensities owing to fluorescence resonance energy transfer. Along with that, the changes in fluorescent colors are visible to the naked eye. Accordingly, Hg2+ were determined ranging from 0.1 to 9.0 μM by fluorescence analysis with the detection limit of 4.92 nM. Moreover, a homemade device utilizing smartphone and microfluidic chip was designed for colorimetric determination of Hg2+ ranging from 0.5 to 7.0 μM with good portability and usefulness. The proposed methods were used for Hg2+ detection in Porphyra with the recoveries of 101.83-114.00%, suggesting the considerable potential for evaluating Hg2+ levels in aquatic products.
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Affiliation(s)
- Yongqiang Shi
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Wenting Li
- Agricultural Product Processing and Storage Lab, School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Xuping Feng
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Lei Lin
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Pengcheng Nie
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang 310058, China
| | - Jiyong Shi
- Agricultural Product Processing and Storage Lab, School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China
| | - Xiaobo Zou
- Agricultural Product Processing and Storage Lab, School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China.
| | - Yong He
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, Zhejiang 310058, China.
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5
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Fluorometric determination of the p53 cancer gene using strand displacement amplification on gold nanoparticles. Mikrochim Acta 2019; 186:517. [DOI: 10.1007/s00604-019-3609-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Accepted: 06/13/2019] [Indexed: 12/21/2022]
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Zhang Z, Oni O, Liu J. New insights into a classic aptamer: binding sites, cooperativity and more sensitive adenosine detection. Nucleic Acids Res 2017; 45:7593-7601. [PMID: 28591844 PMCID: PMC5737652 DOI: 10.1093/nar/gkx517] [Citation(s) in RCA: 111] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2017] [Accepted: 06/01/2017] [Indexed: 11/27/2022] Open
Abstract
The DNA aptamer for adenosine (also for AMP and ATP) is a highly conserved sequence that has recurred in a few selections. It it a widely used model aptamer for biosensor development, and its nuclear magnetic resonance structure shows that each aptamer binds two AMP molecules. In this work, each binding site was individually removed by rational sequence design, while the remaining site still retained a similar binding affinity and specificity as confirmed by isothermal titration calorimetry. The thermodynamic parameters of binding are presented, and its biochemical implications are discussed. The number of binding sites can also be increased, and up to four sites are introduced in a single DNA sequence. Finally, the different sequences are made into fluorescent biosensors based on the structure-switching signaling aptamer design. The one-site aptamer has 3.8-fold higher sensitivity at lower adenosine concentration with a limit of detection of 9.1 μM adenosine, but weaker fluorescence signal at higher adenosine concentrations, consistent with a moderate cooperativity in the original aptamer. This work has offered insights into a classic aptamer for the relationship between the number of binding sites and sensitivity, and a shorter aptamer for improved biosensor design.
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Affiliation(s)
- Zijie Zhang
- Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Olatunji Oni
- Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - Juewen Liu
- Department of Chemistry, Waterloo Institute for Nanotechnology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
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Hu Q, Kong J, Li Y, Zhang X. A signal-on electrochemical DNA biosensor based on potential-assisted Cu(I)-catalyzed azide-alkyne cycloaddition mediated labeling of hairpin-like oligonucleotide with electroactive probe. Talanta 2015; 147:516-22. [PMID: 26592641 DOI: 10.1016/j.talanta.2015.10.039] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 10/12/2015] [Accepted: 10/14/2015] [Indexed: 11/30/2022]
Abstract
A novel electrochemical biosensor was developed for the signal-on detection of sequence-specific DNA by exploiting potential-assisted Cu(I)-catalyzed azide-alkyne cycloaddition (φCuAAC) as an efficient approach for the labeling of hairpin-like oligonucleotide (hairpin) with electroactive probe. The hairpins, dually labeled with thiol and azide at either terminal, were firstly self-assembled on gold electrode and served as the capture probes for the specific recognition of target DNA. Upon hybridization with target DNA, the surface-confined hairpins were unfolded, liberating the azide-containing terminals away from electrode surface. Subsequently, the unfolded hairpins were conveniently and efficiently labeled with ethynylferrocene (EFC) via the φCuAAC. The quantitatively labeled EFC was finally measured via differential pulse voltammetry (DPV) for the signal-on electrochemical detection of sequence-specific DNA. The biosensor presented a good linear response over the range from 1pM to 1nM with a detection limit of 0.62pM. Results also revealed that it was highly specific and held a good detection capability in serum samples. Furthermore, the ability to chemoselectively label hairpin-like oligonucleotide with signal reporter by electrical addressing, together with the simplicity and efficiency of the φCuAAC, makes it compatible with microfluidic devices and microelectrode arrays to achieve the miniaturized and multiplexed detections.
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Affiliation(s)
- Qiong Hu
- School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, PR China
| | - Jinming Kong
- School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, PR China.
| | - Yajie Li
- School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, PR China
| | - Xueji Zhang
- School of Environmental and Biological Engineering, Nanjing University of Science & Technology, Nanjing 210094, PR China; Chemistry Department, College of Arts and Sciences, University of South Florida, East Fowler Ave, Tampa, FL 33620-4202, United States.
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8
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Zhao T, Liu R, Ding X, Zhao J, Yu H, Wang L, Xu Q, Wang X, Lou X, He M, Xiao Y. Nanoprobe-Enhanced, Split Aptamer-Based Electrochemical Sandwich Assay for Ultrasensitive Detection of Small Molecules. Anal Chem 2015; 87:7712-9. [PMID: 26171721 DOI: 10.1021/acs.analchem.5b01178] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
It is quite challenging to improve the binding affinity of antismall molecule aptamers. We report that the binding affinity of anticocaine split aptamer pairs improved by up to 66-fold by gold nanoparticles (AuNP)-attached aptamers due to the substantially increased local concentration of aptamers and multiple and simultaneous ligand interactions. The significantly improved binding affinity enables the detection of small molecule targets with unprecedented sensitivity, as demonstrated in nanoprobe-enhanced split aptamer-based electrochemical sandwich assays (NE-SAESA). NE-SAESA replaces the traditional molecular reporter probe with AuNPs conjugated to multiple reporter probes. The increased binding affinity allowed us to use 1,000-fold lower reporter probe concentrations relative to those employed in SAESA. We show that the near-elimination of background in NE-SAESA effectively improves assay sensitivity by ∼1,000-100,000-fold for ATP and cocaine detection, relative to equivalent SAESA. With the ongoing development of new strategies for the selection of aptamers, we anticipate that our sensor platform should offer a generalizable approach for the high-sensitivity detection of diverse targets. More importantly, we believe that NE-SAESA represents a novel strategy to improve the binding affinity between a small molecule and its aptamer and potentially can be extended to other detection platforms.
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Affiliation(s)
- Tao Zhao
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Ran Liu
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Xiaofan Ding
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Juncai Zhao
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Haixiang Yu
- ‡Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
| | - Lei Wang
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Qing Xu
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Xuan Wang
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Xinhui Lou
- †Department of Chemistry, Capital Normal University, Xisanhuan North Road 105, Beijing 100048, China
| | - Miao He
- §School of Environment, Tsinghua University, Beijing 100084, China
| | - Yi Xiao
- ‡Department of Chemistry and Biochemistry, Florida International University, Miami, Florida 33199, United States
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Feng C, Zhu J, Sun J, Jiang W, Wang L. Hairpin assembly circuit-based fluorescence cooperative amplification strategy for enzyme-free and label-free detection of small molecule. Talanta 2015; 143:101-106. [PMID: 26078135 DOI: 10.1016/j.talanta.2015.05.072] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Revised: 05/16/2015] [Accepted: 05/25/2015] [Indexed: 12/28/2022]
Abstract
Here, we developed an enzyme-free, label-free, and sensitive fluorescence cooperative amplification strategy based on a hairpin assembly circuit which coupled catalytic hairpin assembly (CHA) with hybridization chain reaction (HCR) for small molecule adenosine. A double-strand DNA probe with aptamer-catalysis strand (Apt-C) and inhibit strand (Inh) was designed for adenosine recognition and signal transduction which was named as Apt-C/Inh. Hairpins H1 and H2 were employed for constructing the CHA, and hairpins H3 and H4 for the HCR. Through the binding of adenosine and the Apt-C, the Inh was released from the Apt-C/Inh. Then the free Apt-C initiated the CHA through successively opening H1 and H2, generating H1/H2 complex and recyclable Apt-C. Next, the released Apt-C entered another CHA cycle, and the H1/H2 complex further initiated the HCR of H3 and H4 which induced the formation of the concatemers of H3/H4 complex. Such a process brought the two ends of hairpins H3 into close proximity, yielding numerous integrated G-quadruplexes which were initially sequestered in the stem and two terminals of H3. Finally, N-methyl mesoporphyrin IX (NMM) was added to generate an enhanced fluorescence signal. In the proposed strategy, driven only by the energy from hybridization, one target could trigger multiple HCR events via CHA-based target-cycle, leading to a remarkable enzyme-free amplification for adenosine. The detection limit could achieve as low as 9.7 × 10(-7) mol L(-1). Furthermore, G-quadruplexes were applied to construct label-free hairpin assembly circuit, which made it more simple and cost-effective. The satisfactory recoveries were obtained when detecting adenosine in spiked human serum and urine samples, demonstrating the feasibility of this detection strategy in biological samples.
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Affiliation(s)
- Chunjing Feng
- Key Laboratory of Natural Products Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, 250012 Jinan, PR China; Department of Pharmacy, First Affiliated Hospital of PLA General Hospital, 100048 Beijing, PR China
| | - Jing Zhu
- School of Chemistry and Chemical Engineering, Shandong University, 250100 Jinan, PR China
| | - Jiewei Sun
- Key Laboratory of Natural Products Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, 250012 Jinan, PR China
| | - Wei Jiang
- School of Chemistry and Chemical Engineering, Shandong University, 250100 Jinan, PR China.
| | - Lei Wang
- Key Laboratory of Natural Products Chemical Biology, Ministry of Education, School of Pharmaceutical Sciences, Shandong University, 250012 Jinan, PR China.
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Yao GH, Liang RP, Huang CF, Zhang L, Qiu JD. Enzyme-free surface plasmon resonance aptasensor for amplified detection of adenosine via target-triggering strand displacement cycle and Au nanoparticles. Anal Chim Acta 2015; 871:28-34. [PMID: 25847158 DOI: 10.1016/j.aca.2015.02.028] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 02/03/2015] [Accepted: 02/10/2015] [Indexed: 12/31/2022]
Abstract
Herein, we combine the advantage of aptamer technique with the amplifying effect of an enzyme-free signal-amplification and Au nanoparticles (NPs) to design a sensitive surface plasmon resonance (SPR) aptasensor for detecting small molecules. This detection system consists of aptamer, detection probe (c-DNA1) partially hybridizing to the aptamer strand, Au NPs-linked hairpin DNA (Au-H-DNA1), and thiolated hairpin DNA (H-DNA2) previously immobilized on SPR gold chip. In the absence of target, the H-DNA1 possessing hairpin structure cannot hybridize with H-DNA2 and thereby Au NPs will not be captured on the SPR gold chip surface. Upon addition of target, the detection probe c-DNA1 is forced to dissociate from the c-DNA1/aptamer duplex by the specific recognition of the target to its aptamer. The released c-DNA1 hybridizes with Au-H-DNA1 and opens the hairpin structure, which accelerate the hybridization between Au-H-DNA1 and H-DNA2, leading to the displacement of the c-DNA1 through a branch migration process. The released c-DNA1 then hybridizes with another Au-H-DNA1 probe, and the cycle starts anew, resulting in the continuous immobilization of Au-H-DNA1 probes on the SPR chip, generating a significant change of SPR signal due to the electronic coupling interaction between the localized surface plasma of the Au NPs and the surface plasma wave. With the use of adenosine as a proof-of-principle analyte, this sensing platform can detect adenosine specifically with a detection limit as low as 0.21 pM, providing a simple, sensitive and selective protocol for small target molecules detection.
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Affiliation(s)
- Gui-Hong Yao
- Department of Chemistry, Nanchang University, Nanchang 330031, PR China
| | - Ru-Ping Liang
- Department of Chemistry, Nanchang University, Nanchang 330031, PR China.
| | - Chun-Fang Huang
- Department of Chemistry, Nanchang University, Nanchang 330031, PR China
| | - Li Zhang
- Department of Chemistry, Nanchang University, Nanchang 330031, PR China
| | - Jian-Ding Qiu
- Department of Chemistry, Nanchang University, Nanchang 330031, PR China; Department of Chemical Engineering, Pingxiang College, Pingxiang 337055, PR China.
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Zhang L, Liu H, Shao Y, Lin C, Jia H, Chen G, Yang D, Wang Y. Selective lighting up of epiberberine alkaloid fluorescence by fluorophore-switching aptamer and stoichiometric targeting of human telomeric DNA G-quadruplex multimer. Anal Chem 2015; 87:730-7. [PMID: 25429435 PMCID: PMC5515279 DOI: 10.1021/ac503730j] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Aptamers, that exist naturally in living cells as functional elements and can switch nonfluorescent natural targets to fluorophores, are very useful in developing highly sensitive and selective biosensors and screening functional agents. This work demonstrates that human telomeric G-quadruplex (HTG) can serve as a potential fluorophore-switching aptamer (FSA) to target a natural isoquinoline alkaloid. We found that, among the G-quadruplexes studied here and the various structurally similar alkaloids including epiberberine (EPI), berberine (BER), palmatine (PAL), jatrorrhizine (JAT), coptisine (COP), worenine (WOR), sanguinarine (SAN), chelerythrine (CHE), and nitidine (NIT), only the HTG DNA, especially with a 5'-TA-3' residue at the 5' end of the G-quadruplex tetrad (5'-TAG3(TTAG3)3-3', TA[Q]) as the minimal sequence, is the most efficient FSA to selectively light up the EPI fluorescence. Compared to the 5' end flanking sequences, the 3' end flanking sequences of the tetrad contribute significantly less to the recognition of EPI. The binding affinity of EPI to TA[Q] (K(d) = 37 nM) is at least 20 times tighter than those of the other alkaloids. The steady-state absorption, steady-state/time-resolved fluorescence, and NMR studies demonstrate that EPI most likely interact with the 5' end flanking sequence substructure beyond the core [Q] and the G-quadruplex tetrad in a much more specific manner than the other alkaloids. The highly selective and tight binding of EPI with the FSA and significantly enhanced fluorescence suggest the potential development of a selective EPI sensor (detection limit of 10 nM). More importantly, EPI, as the brightest FSA emitter among the alkaloids, can also serve as an efficient conformation probe for HTG DNA and discriminate the DNA G-quadruplex from the RNA counterpart. Furthermore, EPI can bind stoichiometrically to each G-quadruplex unit of long HTG DNA multimer with the most significant fluorescence enhancement, which has not been achieved by the previously reported probes. Our work suggests the potential use of EPI as a bioimaging probe and a therapeutic DNA binder.
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Affiliation(s)
- Lihua Zhang
- Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004, China
| | - Hua Liu
- Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004, China
| | - Yong Shao
- Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004, China
| | - Clement Lin
- College of Pharmacy, BIO5 Institute, Arizona Cancer Center, Department of Chemistry, University of Arizona, 1703 East Mabel Street, Tucson, Arizona 85721, United States
| | - Huan Jia
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Gang Chen
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
| | - Danzhou Yang
- College of Pharmacy, BIO5 Institute, Arizona Cancer Center, Department of Chemistry, University of Arizona, 1703 East Mabel Street, Tucson, Arizona 85721, United States
| | - Ying Wang
- Institute of Physical Chemistry, Zhejiang Normal University, Jinhua, Zhejiang 321004, China
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12
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Yao GH, Liang RP, Yu XD, Huang CF, Zhang L, Qiu JD. Target-triggering multiple-cycle amplification strategy for ultrasensitive detection of adenosine based on surface plasma resonance techniques. Anal Chem 2014; 87:929-36. [PMID: 25494977 DOI: 10.1021/ac503016f] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
An ultrasensitive protocol for surface plasma resonance (SPR) detection of adenosine is designed with the aptamer-based target-triggering cascade multiple cycle amplification, and streptavidin-coated Au-NPs (Au NPs-SA) enhancement to enhance the SPR signals. The cascade amplification process consists of the aptamer-based target-triggering nicking enzyme signaling amplification (T-NESA), the nicking enzyme signaling amplification (NESA) and the hybridization chain reaction (HCR), the entire circle amplification process is triggered by the target recognition of adenosine. Upon recognition of the aptamer to target adenosine, DNA s1 is released from the aptamer and then hybridizes with hairpin DNA (HP1). The DNA s1 can be dissociated from HP1 under the reaction of nicking endonuclease to initiate the next hybridization and cleavage process. Moreover, the products of the upstream cycle (T-NESA) (DNA s2 and s3) could act as the "DNA trigger" of the downstream cycle (NESA and HCR) to generate further signal amplification, resulting in the immobilization of abundant Au NPs-SA on the gold substrate, and thus significant SPR enhancement is achieved due to the electronic coupling interaction between the localized surface plasma of Au NPs and the surface plasma wave. This detection method exhibits excellent specificity and sensitivity toward adenosine with a detection limit of 4 fM. The high sensitivity and specificity make this method a great potential for detecting biomolecules with trace amounts in bioanalysis and clinical biomedicine.
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Affiliation(s)
- Gui-Hong Yao
- Department of Chemistry and ‡School of Life Sciences, Nanchang University , Nanchang 330031, People's Republic of China
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13
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Zhang S, Hu X, Yang X, Sun Q, Xu X, Liu X, Shen G, Lu J, Shen G, Yu R. Background eliminated signal-on electrochemical aptasensing platform for highly sensitive detection of protein. Biosens Bioelectron 2014; 66:363-9. [PMID: 25463644 DOI: 10.1016/j.bios.2014.11.044] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 11/20/2014] [Accepted: 11/21/2014] [Indexed: 12/29/2022]
Abstract
Using platelet-derived growth factor B chain dimer (PDGF-BB) as the model target, a background current eliminated electrochemical aptameric sensing platform for highly sensitive and signal-on detection of protein is proposed in this paper. Successful fabrication of the biosensor depends on ingenious design of aptamer probe, which contains the aptamer sequence for PDGF-BB and the recognition sequence for EcoRI endonuclease. In the absence of PDGF-BB, the ferrocene labeled aptamer probe folds into a hairpin structure and forms a recognition site for EcoRI. By treatment with endonuclease, the specific and cleavable double-stranded region is cut off and redox-active ferrocene molecule is removed from the electrode surface, and almost no peak current is observed. When binding with target protein, the designed aptamer probe changes its conformation and dissociates the recognition double strand. The integrated aptamer probe is maintained when exposing to EcoRI endonuclease, resulting in obvious peak current. Therefore, a signal-on and sensitive sensing strategy for PDGF-BB detection is fabricated with eliminated background current. Under the optimized experimental conditions, a wide linear response range of 4 orders of magnitude from 20pgmL(-1) to 200ngmL(-1) is achieved with a detection limit of 10pgmL(-1). Moreover, the present aptameric platform is universal for the analysis of a broad range of target molecules of interest by changing and designing the sequence of aptamer probe.
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Affiliation(s)
- Songbai Zhang
- Department of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, PR China; State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China.
| | - Xia Hu
- Department of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, PR China
| | - Xiaohui Yang
- Department of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, PR China
| | - Qinli Sun
- Department of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, PR China
| | - Xiaolin Xu
- Department of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, PR China
| | - Xuewen Liu
- Department of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, PR China
| | - Guangyu Shen
- Department of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, PR China
| | - Jilin Lu
- Department of Chemistry and Chemical Engineering, Hunan University of Arts and Science, Changde 415000, PR China
| | - Guoli Shen
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China
| | - Ruqin Yu
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, PR China
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14
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Qiu L, Qiu L, Zhou H, Wu Z, Shen G, Yu R. Sensitive and selective electrochemical DNA sensor for the analysis of cancer-related single nucleotide polymorphism. NEW J CHEM 2014. [DOI: 10.1039/c4nj00549j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Zhang Y, Liu F, Nie J, Jiang F, Zhou C, Yang J, Fan J, Li J. An electrochemical sensing platform based on local repression of electrolyte diffusion for single-step, reagentless, sensitive detection of a sequence-specific DNA-binding protein. Analyst 2014; 139:2193-8. [PMID: 24647581 DOI: 10.1039/c4an00096j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper, we report for the first time an electrochemical biosensor for single-step, reagentless, and picomolar detection of a sequence-specific DNA-binding protein using a double-stranded, electrode-bound DNA probe terminally modified with a redox active label close to the electrode surface. This new methodology is based upon local repression of electrolyte diffusion associated with protein-DNA binding that leads to reduction of the electrochemical response of the label. In the proof-of-concept study, the resulting electrochemical biosensor was quantitatively sensitive to the concentrations of the TATA binding protein (TBP, a model analyte) ranging from 40 pM to 25.4 nM with an estimated detection limit of ∼10.6 pM (∼80 to 400-fold improvement on the detection limit over previous electrochemical analytical systems).
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Affiliation(s)
- Yun Zhang
- College of Chemistry and Bioengineering, Guilin University of Technology, Guilin 541004, China.
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16
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Wu L, Wang J, Sun H, Ren J, Qu X. Graphene-mesoporous silica-dispersed palladium nanoparticles-based probe carrier platform for electrocatalytic sensing of telomerase activity at less than single-cell level. Adv Healthc Mater 2014; 3:588-95. [PMID: 24039181 DOI: 10.1002/adhm.201300228] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2013] [Revised: 08/02/2013] [Indexed: 11/07/2022]
Abstract
Human telomerase is a specialized ribonucleoprotein polymerase and is used as a clinical cancer marker and special target for chemotherapy. Traditional telomerase detection uses "telomerase repeat amplification protocol" (TRAP) assay. However, TRAP is questioned because it requires use of DNA polymerases, which is susceptible to polymerase chain reaction (PCR)-derived artifacts and time-consuming. Here, a novel PCR-free, electrocatalytic assay for signal-amplified detection of telomerase activity using graphene-mesoporous silica-dispersed palladium nanoparticles-based probe carrier platform to improve probe-target recognition is reported. The low background noise is achieved by using DNA site-specific cleavage endonuclease and the detection signal is amplified by using hemoglobin. As a highly efficient electron sink, hemoglobin does not carry out direct reduction at the surface, minimizing false positives. These merits make this assay highly sensitive, achieving the sensitivity comparable to TRAP. The developed electrocatalysis assay is PCR-free, simple in design, and fast in operation, therefore avoiding PCR amplification-related errors, which make it more reliable to evaluate telomerase activity for clinical use.
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Affiliation(s)
- Li Wu
- Laboratory of Chemical Biology, Division of Biological Inorganic Chemistry, State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China; University of Chinese Academy of Sciences; Beijing 100039 China
| | - Jiasi Wang
- Laboratory of Chemical Biology, Division of Biological Inorganic Chemistry, State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China; University of Chinese Academy of Sciences; Beijing 100039 China
| | - Hanjun Sun
- Laboratory of Chemical Biology, Division of Biological Inorganic Chemistry, State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China; University of Chinese Academy of Sciences; Beijing 100039 China
| | - Jinsong Ren
- Laboratory of Chemical Biology, Division of Biological Inorganic Chemistry, State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China; University of Chinese Academy of Sciences; Beijing 100039 China
| | - Xiaogang Qu
- Laboratory of Chemical Biology, Division of Biological Inorganic Chemistry, State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin, 130022, China; University of Chinese Academy of Sciences; Beijing 100039 China
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17
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Qiu L, Qiu L, Wu ZS, Shen G, Yu RQ. Cooperative Amplification-Based Electrochemical Sensor for the Zeptomole Detection of Nucleic Acids. Anal Chem 2013; 85:8225-31. [DOI: 10.1021/ac401300a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Liping Qiu
- State Key
Laboratory of Chemo/Biosensing and Chemometrics,
Chemistry and Chemical Engineering College, Hunan University, Changsha 410082, People’s Republic of China
| | - Li Qiu
- State Key
Laboratory of Chemo/Biosensing and Chemometrics,
Chemistry and Chemical Engineering College, Hunan University, Changsha 410082, People’s Republic of China
| | - Zai-Sheng Wu
- State Key
Laboratory of Chemo/Biosensing and Chemometrics,
Chemistry and Chemical Engineering College, Hunan University, Changsha 410082, People’s Republic of China
| | - Guoli Shen
- State Key
Laboratory of Chemo/Biosensing and Chemometrics,
Chemistry and Chemical Engineering College, Hunan University, Changsha 410082, People’s Republic of China
| | - Ru-Qin Yu
- State Key
Laboratory of Chemo/Biosensing and Chemometrics,
Chemistry and Chemical Engineering College, Hunan University, Changsha 410082, People’s Republic of China
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18
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Zhang L, Wang Y, Wang J, Shi J, Deng K, Fu W. rhEPO/EPO discrimination with ultrasensitive electrochemical biosensor based on sandwich-type nano-Au/ZnO sol-gel/nano-Au signal amplification. Biosens Bioelectron 2013; 50:217-23. [PMID: 23867351 DOI: 10.1016/j.bios.2013.06.038] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Revised: 06/10/2013] [Accepted: 06/19/2013] [Indexed: 12/16/2022]
Abstract
This research established a non-labeled electrochemical biosensor for discrimination of recombinant human erythropoietin (rhEPO) and endogenous erythropoietin (EPO). We prepared a glassy carbon electrode (GCE) modified by a unique sandwich-like nano-Au/ZnO sol-gel/nano-Au compound membrane for signal amplification. The porous sol-gel structure facilitates protein activity maintenance and thermostability. Nano-Au is characterized by a large specific surface area, high surface activity, high absorbability, and good electro-conductivity and biocompatibility. By combining the advantages of both ZnO sol-gel and nano-Au, the amount of erythropoietin receptor (EPOR) increased substantially, and electron transfer of EPOR protein and electrode surface increased accordingly. In the present study, the effects of experimental conditions such as nano-Au electrodeposition time and nano-Au concentration were investigated by cyclic voltammetry, and the process of GCE modification was characterized electrochemically. We successfully developed a new method for electrochemical detection of trace rhEPO/EPO. More importantly, the response current change (ΔI) of the nano-Au/ZnO sol-gel/nano-Au modified GCE increases 3-fold when compared with that of the unmodified electrode and the sensor detection sensitivity increases significantly. In conclusion, this electrochemical biosensor is simple to prepare and allows fast, accurate, and specific detection of trace rhEPO in clinical monitoring and stimulant discrimination.
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Affiliation(s)
- Liqun Zhang
- Department of Laboratory Medicine, Southwest Hospital, Third Military Medical University, Chongqing 400038, PR China.
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19
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Cai S, Sun Y, Lau C, Lu J. Sensitive chemiluminescence aptasensor based on exonuclease-assisted recycling amplification. Anal Chim Acta 2012; 761:137-42. [PMID: 23312324 DOI: 10.1016/j.aca.2012.11.061] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2012] [Revised: 11/29/2012] [Accepted: 11/30/2012] [Indexed: 12/25/2022]
Abstract
We report herein an exonuclease-assisted aptamer-based target recycling amplification strategy for sensitive and selective chemiluminescence (CL) determination of adenosine. This aptasensor is based on target-induced release of aptamers from capture probes immobilized on the 96-well plate surface, and thus leading to a decreased hybridization with gold nanoparticle-functionalized reporter sequences followed by a CL signal. The introduction of exonuclease III catalyzes the stepwise removal of mononucleotides from 3'-hydroxyl termini of duplex DNAs of aptamers, liberating the adenosine. Therefore, a single copy of target adenosine can lead to the release and digestion of numerous aptamer strands from the 96-well plates and ultimately an enhanced sensitivity is achieved. Experimental results revealed that the exonuclease-assisted recycling strategy enabled the monitoring of adenosine with wide working ranges and low detection limits (LOD: 0.5 nM). This new CL strategy might create a novel technology for the detection of various targets and could find wide applications in the environmental and biomedical fields.
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Affiliation(s)
- Sheng Cai
- School of Pharmacy, Key Laboratory of Smart Drug Delivery, Ministry of Education & PLA, Fudan University, 826 Zhangheng Road, Shanghai 201203, China
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20
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Su J, He X, Wang Y, Wang K, Chen Z, Yan G. A sensitive signal-on assay for MTase activity based on methylation-responsive hairpin-capture DNA probe. Biosens Bioelectron 2012; 36:123-8. [DOI: 10.1016/j.bios.2012.04.012] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Revised: 03/29/2012] [Accepted: 04/04/2012] [Indexed: 01/31/2023]
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21
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Cheng W, Ding S, Li Q, Yu T, Yin Y, Ju H, Ren G. A simple electrochemical aptasensor for ultrasensitive protein detection using cyclic target-induced primer extension. Biosens Bioelectron 2012; 36:12-7. [DOI: 10.1016/j.bios.2012.03.032] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Revised: 03/01/2012] [Accepted: 03/16/2012] [Indexed: 10/28/2022]
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22
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Yin XB. Functional nucleic acids for electrochemical and electrochemiluminescent sensing applications. Trends Analyt Chem 2012. [DOI: 10.1016/j.trac.2011.09.012] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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23
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Qin H, Liu J, Chen C, Wang J, Wang E. An electrochemical aptasensor for chiral peptide detection using layer-by-layer assembly of polyelectrolyte-methylene blue/polyelectrolyte-graphene multilayer. Anal Chim Acta 2011; 712:127-31. [PMID: 22177075 DOI: 10.1016/j.aca.2011.10.044] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2011] [Revised: 10/14/2011] [Accepted: 10/19/2011] [Indexed: 10/15/2022]
Abstract
Here we demonstrate for the first time that by physically adsorbing aptamer onto conductive film assembled via alternate adsorption of graphene/polyelectrolyte and methylene blue/polyelectrolyte, a label-free electrochemical aptasensor with high sensitivity and selectivity for peptide detection is constructed. Graphene multilayer derived from layer-by-layer assembly has played significant roles in this sensing strategy: allowing accumulation of methylene blue, facilitating electron transfer and providing much more adsorption site. As compared to previous electrochemical aptasensors, the current sensor based on graphene multilayer alternated with electroactive molecule layer offers extremely high capability for sensitive detection of target without interference of environmental surrounding. This electroactive probe-confined graphene multilayer confers great flexibility to combine with differential pulse voltammetry (DPV) together. In the presence of target d entiomer of arginine vasopressin (D-VP), the binding of peptide to aptamer block the electron transfer process of MB, leading to decreased current peak of DPV. By this way, this electrochemical aptasensor based on electroactive molecule-intercalated graphene multilayer provide highly sensitive and specific detection of D-VP with the lowest detectable concentration of 1 ng mL(-1) and a wide detection range from 1 to 265 ng mL(-1).
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Affiliation(s)
- Haixia Qin
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
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24
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Fei YH, Liu D, Wu ZS, Shen GL, Yu RQ. DNA-Encoded Signal Conversion for Sensitive Microgravimetric Detection of Small Molecule–Protein Interaction. Bioconjug Chem 2011; 22:2369-76. [DOI: 10.1021/bc200086c] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yue-Hua Fei
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, Chemistry and Chemical Engineering College, Hunan University, Changsha 410082, P R China
- Science College of Hunan Agricultural University, Changsha 410128, PR
China
| | - Dengyou Liu
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, Chemistry and Chemical Engineering College, Hunan University, Changsha 410082, P R China
- Science College of Hunan Agricultural University, Changsha 410128, PR
China
| | - Zai-Sheng Wu
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, Chemistry and Chemical Engineering College, Hunan University, Changsha 410082, P R China
- Science College of Hunan Agricultural University, Changsha 410128, PR
China
| | - Guo-Li Shen
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, Chemistry and Chemical Engineering College, Hunan University, Changsha 410082, P R China
- Science College of Hunan Agricultural University, Changsha 410128, PR
China
| | - Ru-Qin Yu
- State Key Laboratory of Chemo/Biosensing
and Chemometrics, Chemistry and Chemical Engineering College, Hunan University, Changsha 410082, P R China
- Science College of Hunan Agricultural University, Changsha 410128, PR
China
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