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Niazi M, Azizi A, Khajavi Z, Sheikh M, Taheri S, Radfar S, Alizadeh A, Ghanbari R. A universal ratiometric method for Micro-RNA detection based on the ratio of electrochemical/electrochemiluminescence signal, and toehold-mediated strand displacement amplification. Anal Chim Acta 2023; 1257:341119. [PMID: 37062560 DOI: 10.1016/j.aca.2023.341119] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 03/05/2023] [Accepted: 03/17/2023] [Indexed: 04/04/2023]
Abstract
An ultra-selective and reproductive ratiometric platform was introduced based on the ratio of Ru(phen)32+ electrochemiluminescence (ECL) signal and methylene blue (MB) electrochemistry (EC) signal, which was amplified using a specific and efficient toehold-mediated strand displacement (TMSD). The stable DNA nanoclews (NCs) were efficiently loaded with MB (MB-NCs) as EC signal tags after being synthesized utilizing a simple rolling circle amplification reaction. Besides, Ti3C2-based nanocomposite could apply as a superb carrier for both Ru(phen)32+ and gold nanoparticles (Ti3C2-Au-Ru), resulting in a nearly constant ECL internal reference to eliminate the possible interferences. The Ti3C2-Au-Ru was attached to the surface of the electrode using Nafion, which exhibited excellent conductivity, and hairpin DNAs (hDNAs) were fixed on AuNPs via an Au-S bond. The designed biosensor was finally applied for miRNA-18a detection as a target model. The TMSD method made it possible to concurrently convert and amplify a single miRNA-18ainput into a large amount of output DNAs with high selectivity. These output DNAs were designed to unfold the stem-locked area of hDNAs. The opened hDNAs then hybridized with the MB-NCs to produce an EC signal. In the proposed biosensing system, by raising the target concentration of miRNA, the EC signal gradually rose, the ECL signal remained nearly constant, and the ratiometric detection method markedly promoted biosensor accuracy. Linear correlations of the ratio value of the EC/ECL with miRNA-18a concentrations between 20 aM and 50 pMwere observed, with the limit of detection of 9 aM. The biosensor was applied to detect miRNA-18a in real serum samples with satisfactory results.
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Affiliation(s)
- Mohammad Niazi
- Department of Biological Science and Technology, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
| | - Ava Azizi
- Department of Biological Science and Technology, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
| | - Zeynab Khajavi
- Department of Biological Science and Technology, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
| | - Milad Sheikh
- Department of Biological Science and Technology, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
| | - Salman Taheri
- Stem Cell and Regenerative Medicine Center of Excellence, Tehran University of Medical Science, Tehran, Iran.
| | - Sasan Radfar
- Stem Cell and Regenerative Medicine Center of Excellence, Tehran University of Medical Science, Tehran, Iran.
| | - Abdolhamid Alizadeh
- Department of Organic Chemistry, Faculty of Chemistry, Alzahra University, Tehran, 1993893973, Iran.
| | - Reza Ghanbari
- Department of Biological Science and Technology, Najafabad Branch, Islamic Azad University, Najafabad, Iran.
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2
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Radfar S, Ghanbari R, Alizadeh A, Safaei Z, Repo E. A Nonenzymatic DNA Nanomachine for Detection of Biomolecules by DNA Walker Strategy and Radical Polymerization Signal Amplification. ChemistrySelect 2022. [DOI: 10.1002/slct.202200724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sasan Radfar
- Stem Cell and Regenerative Medicine Center of Excellence Tehran University of Medical Science Tehran Iran
| | - Reza Ghanbari
- Department of Biological Science and Technology Najafabad Branch Islamic Azad University Najafabad Iran
| | - Abdolhamid Alizadeh
- Department of Chemistry Faculty of Physics and Chemistry Alzahra University Tehran 1993893973 Iran
- Research club iQneiform Oy Juva Finland
| | | | - Eveliina Repo
- Department of Separation Science School of Engineering Science LUT University Finland
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3
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Asefifeyzabadi N, Durocher G, Tshilenge KT, Alam T, Ellerby LM, Shamsi MH. PNA microprobe for label-free detection of expanded trinucleotide repeats. RSC Adv 2022; 12:7757-7761. [PMID: 35424746 PMCID: PMC8982460 DOI: 10.1039/d2ra00230b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 03/03/2022] [Indexed: 11/28/2022] Open
Abstract
We present a PNA microprobe sensing platform to detect trinucleotide repeat mutation by electrochemical impedance spectroscopy. The microprobe platform discriminated Huntington's disease-associated CAG repeats in cell-derived total RNA with S/N 1 : 3. This sensitive, label-free, and PCR-free detection strategy may be employed in the future to develop biosensing platforms for the detection of a plethora of repeat expansion disorders.
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Affiliation(s)
- Narges Asefifeyzabadi
- School of Chemical and Biomolecular Sciences, 1245 Lincoln Dr, Southern Illinois University at Carbondale IL 62901 USA
| | - Grace Durocher
- School of Chemical and Biomolecular Sciences, 1245 Lincoln Dr, Southern Illinois University at Carbondale IL 62901 USA
| | | | - Tanimul Alam
- The Buck Institute for Research on Aging 8001 Redwood Blvd Novato CA 94945 USA
| | - Lisa M Ellerby
- The Buck Institute for Research on Aging 8001 Redwood Blvd Novato CA 94945 USA
| | - Mohtashim H Shamsi
- School of Chemical and Biomolecular Sciences, 1245 Lincoln Dr, Southern Illinois University at Carbondale IL 62901 USA
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Radfar S, Ghanbari R, Attaripour Isfahani A, Rezaei H, Kheirollahi M. A novel signal amplification tag to develop rapid and sensitive aptamer-based biosensors. Bioelectrochemistry 2022; 145:108087. [DOI: 10.1016/j.bioelechem.2022.108087] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 02/09/2022] [Accepted: 02/11/2022] [Indexed: 11/25/2022]
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Sequence-Independent DNA Adsorption on Few-Layered Oxygen-Functionalized Graphene Electrodes: An Electrochemical Study for Biosensing Application. BIOSENSORS 2021; 11:bios11080273. [PMID: 34436075 PMCID: PMC8394360 DOI: 10.3390/bios11080273] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/12/2021] [Accepted: 08/12/2021] [Indexed: 11/18/2022]
Abstract
DNA is strongly adsorbed on oxidized graphene surfaces in the presence of divalent cations. Here, we studied the effect of DNA adsorption on electrochemical charge transfer at few-layered, oxygen-functionalized graphene (GOx) electrodes. DNA adsorption on the inkjet-printed GOx electrodes caused amplified current response from ferro/ferricyanide redox probe at concentration range 1 aM–10 nM in differential pulse voltammetry. We studied a number of variables that may affect the current response of the interface: sequence type, conformation, concentration, length, and ionic strength. Later, we showed a proof-of-concept DNA biosensing application, which is free from chemical immobilization of the probe and sensitive at attomolar concentration regime. We propose that GOx electrodes promise a low-cost solution to fabricate a highly sensitive platform for label-free and chemisorption-free DNA biosensing.
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Taki M, Rohilla KJ, Barton M, Funneman M, Benzabeh N, Naphade S, Ellerby LM, Gagnon KT, Shamsi MH. Novel probes for label-free detection of neurodegenerative GGGGCC repeats associated with amyotrophic lateral sclerosis. Anal Bioanal Chem 2019; 411:6995-7003. [PMID: 31435686 PMCID: PMC7433021 DOI: 10.1007/s00216-019-02075-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 07/18/2019] [Accepted: 08/06/2019] [Indexed: 01/28/2023]
Abstract
DNA repeat expansion sequences cause a myriad of neurological diseases when they expand beyond a critical threshold. Previous electrochemical approaches focused on the detection of trinucleotide repeats (CAG, CGG, and GAA) and relied on labeling of the probe and/or target strands or enzyme-linked assays. However, detection of expanded GC-rich sequences is challenging because they are prone to forming secondary structures such as cruciforms and quadruplexes. Here, we present label-free detection of hexanucleotide GGGGCC repeat sequences, which cause the leading genetic form of frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS). The approach relies on capturing targets by surface-bound oligonucleotide probes with a different number of complementary repeats, which proportionately translates the length of the target strands into charge transfer resistance (RCT) signal measured by electrochemical impedance spectroscopy. The probe carrying three tandem repeats transduces the number of repeats into RCT with a 3× higher calibration sensitivity and detection limit. Chronocoulometric measurements show a decrease in surface density with increasing repeat length, which is opposite of the impedance trend. This implies that the length of the target itself can contribute to amplification of the impedance signal independent of the surface density. Moreover, the probe can distinguish between a control and patient sequences while remaining insensitive to non-specific Huntington's disease (CAG) repeats in the presence of a complementary target. This label-free strategy might be applied to detect the length of other neurodegenerative repeat sequences using short probes with a few complementary repeats. Graphical abstract Short oligomeric probes with multiple complementary repeats detect long neurodegenerative targets with high sensitivity and transduce into higher impedance signal.
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Affiliation(s)
- Motahareh Taki
- Department of Chemistry & Biochemistry, Southern Illinois University, 1245 Lincoln Dr, Carbondale, IL, 62901, USA
| | - Kushal J Rohilla
- Biochemistry and Molecular Biology, Southern Illinois University School of Medicine, Carbondale, IL, 62901, USA
| | - Maria Barton
- Biochemistry and Molecular Biology, Southern Illinois University School of Medicine, Carbondale, IL, 62901, USA
| | - Madison Funneman
- Department of Chemistry & Biochemistry, Southern Illinois University, 1245 Lincoln Dr, Carbondale, IL, 62901, USA
| | - Najiyah Benzabeh
- Department of Chemistry & Biochemistry, Southern Illinois University, 1245 Lincoln Dr, Carbondale, IL, 62901, USA
| | - Swati Naphade
- The Buck Institute for Research on Aging, 8001 Redwood Blvd, Novato, CA, 94945, USA
| | - Lisa M Ellerby
- The Buck Institute for Research on Aging, 8001 Redwood Blvd, Novato, CA, 94945, USA
| | - Keith T Gagnon
- Department of Chemistry & Biochemistry, Southern Illinois University, 1245 Lincoln Dr, Carbondale, IL, 62901, USA
- Biochemistry and Molecular Biology, Southern Illinois University School of Medicine, Carbondale, IL, 62901, USA
| | - Mohtashim H Shamsi
- Department of Chemistry & Biochemistry, Southern Illinois University, 1245 Lincoln Dr, Carbondale, IL, 62901, USA.
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Conzuelo F, Schulte A, Schuhmann W. Biological imaging with scanning electrochemical microscopy. Proc Math Phys Eng Sci 2018; 474:20180409. [PMID: 30839832 PMCID: PMC6237495 DOI: 10.1098/rspa.2018.0409] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2018] [Accepted: 09/04/2018] [Indexed: 12/27/2022] Open
Abstract
Scanning electrochemical microscopy (SECM) is a powerful and versatile technique for visualizing the local electrochemical activity of a surface as an ultramicroelectrode tip is moved towards or over a sample of interest using precise positioning systems. In comparison with other scanning probe techniques, SECM not only enables topographical surface mapping but also gathers chemical information with high spatial resolution. Considerable progress has been made in the analysis of biological samples, including living cells and immobilized biomacromolecules such as enzymes, antibodies and DNA fragments. Moreover, combinations of SECM with comple-mentary analytical tools broadened its applicability and facilitated multi-functional analysis with extended life science capabilities. The aim of this review is to present a brief topical overview on recent applications of biological SECM, with particular emphasis on important technical improvements of this surface imaging technique, recommended applications and future trends.
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Affiliation(s)
- Felipe Conzuelo
- Analytical Chemistry—Center for Electrochemical Sciences (CES), Faculty for Chemistry and Biochemistry, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany
| | - Albert Schulte
- School of Biomolecular Science and Engineering (BSE), Vidyasirimedhi Institute of Science and Technology (VISTEC), Rayong 21210, Thailand
| | - Wolfgang Schuhmann
- Analytical Chemistry—Center for Electrochemical Sciences (CES), Faculty for Chemistry and Biochemistry, Ruhr-Universität Bochum, Universitätsstr. 150, 44780 Bochum, Germany
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8
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Huang L, Li Z, Lou Y, Cao F, Zhang D, Li X. Recent Advances in Scanning Electrochemical Microscopy for Biological Applications. MATERIALS (BASEL, SWITZERLAND) 2018; 11:E1389. [PMID: 30096895 PMCID: PMC6119995 DOI: 10.3390/ma11081389] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 07/24/2018] [Accepted: 07/28/2018] [Indexed: 12/17/2022]
Abstract
Scanning electrochemical microscopy (SECM) is a chemical microscopy technique with high spatial resolution for imaging sample topography and mapping specific chemical species in liquid environments. With the development of smaller, more sensitive ultramicroelectrodes (UMEs) and more precise computer-controlled measurements, SECM has been widely used to study biological systems over the past three decades. Recent methodological breakthroughs have popularized SECM as a tool for investigating molecular-level chemical reactions. The most common applications include monitoring and analyzing the biological processes associated with enzymatic activity and DNA, and the physiological activity of living cells and other microorganisms. The present article first introduces the basic principles of SECM, followed by an updated review of the applications of SECM in biological studies on enzymes, DNA, proteins, and living cells. Particularly, the potential of SECM for investigating bacterial and biofilm activities is discussed.
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Affiliation(s)
- Luyao Huang
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
| | - Ziyu Li
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
| | - Yuntian Lou
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
| | - Fahe Cao
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China.
| | - Dawei Zhang
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
| | - Xiaogang Li
- Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
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9
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Schiefelbein SHH, Kamal A, She Z, Rentmeister A, Kraatz HB. Direct Bisulfite-Free Detection of 5-Methylcytosine by Using Electrochemical Measurements Aided by a Monoclonal Antibody. ChemElectroChem 2018. [DOI: 10.1002/celc.201800324] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Stephan H. H. Schiefelbein
- University of Muenster; Department of Chemistry; Institute of Biochemistry; Wilhelm-Klemm-Straße 2, D- 48149 Münster Germany
| | - Ajar Kamal
- Department of Physical and Environmental Sciences; University of Toronto Scarborough; 1265 Military Trail Toronto ON M1C 1 A4 Canada
| | - Zhe She
- Department of Physical and Environmental Sciences; University of Toronto Scarborough; 1265 Military Trail Toronto ON M1C 1 A4 Canada
| | - Andrea Rentmeister
- University of Muenster; Department of Chemistry; Institute of Biochemistry; Wilhelm-Klemm-Straße 2, D- 48149 Münster Germany
- Cells-in-Motion Cluster of Excellence (EXC 1003-CiM); University of Muenster; Germany
| | - Heinz-Bernhard Kraatz
- Department of Physical and Environmental Sciences; University of Toronto Scarborough; 1265 Military Trail Toronto ON M1C 1 A4 Canada
- Department of Chemistry; University of Toronto; 80 St. George Street Toronto ON M5S 3H6 Canada
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Polcari D, Dauphin-Ducharme P, Mauzeroll J. Scanning Electrochemical Microscopy: A Comprehensive Review of Experimental Parameters from 1989 to 2015. Chem Rev 2016; 116:13234-13278. [PMID: 27736057 DOI: 10.1021/acs.chemrev.6b00067] [Citation(s) in RCA: 213] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- David Polcari
- Department
of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec Canada, H3A 0B8
| | - Philippe Dauphin-Ducharme
- Department
of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec Canada, H3A 0B8
| | - Janine Mauzeroll
- Department
of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Quebec Canada, H3A 0B8
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Moradi N, Noori A, Mehrgardi MA, Mousavi MF. Scanning Electrochemical Microscopy for Electrochemical Detection of Single-base Mismatches by Tagging Ferrocenecarboxylic Acid as a Redox Probe to DNA. ELECTROANAL 2015. [DOI: 10.1002/elan.201500598] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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12
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Rackus DG, Shamsi MH, Wheeler AR. Electrochemistry, biosensors and microfluidics: a convergence of fields. Chem Soc Rev 2015; 44:5320-40. [PMID: 25962356 DOI: 10.1039/c4cs00369a] [Citation(s) in RCA: 236] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Electrochemistry, biosensors and microfluidics are popular research topics that have attracted widespread attention from chemists, biologists, physicists, and engineers. Here, we introduce the basic concepts and recent histories of electrochemistry, biosensors, and microfluidics, and describe how they are combining to form new application-areas, including so-called "point-of-care" systems in which measurements traditionally performed in a laboratory are moved into the field. We propose that this review can serve both as a useful starting-point for researchers who are new to these topics, as well as being a compendium of the current state-of-the art for experts in these evolving areas.
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Affiliation(s)
- Darius G Rackus
- Department of Chemistry, University of Toronto, 80 St. George St., Toronto, ON M5S 3H6, Canada.
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Mazouz Z, Fourati N, Zerrouki C, Ommezine A, Rebhi L, Yaakoubi N, Kalfat R, Othmane A. Discriminating DNA mismatches by electrochemical and gravimetric techniques. Biosens Bioelectron 2013; 48:293-8. [PMID: 23714847 DOI: 10.1016/j.bios.2013.04.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 04/11/2013] [Accepted: 04/18/2013] [Indexed: 01/07/2023]
Abstract
A silicon nitride functionalized electrode and a 104 MHz lithium tantalate (LiTaO₃) surface acoustic wave (SAW) sensor have been used to investigate target-probe recognition processes. Electrochemical and gravimetric measurements have been considered to monitor hybridization of single base mismatch (SBM) in synthetic oligonucleotides and single-nucleotide polymorphisms ApoE in real clinical genotypes. Obvious discrimination of SBM in nucleotides has been shown by both gravimetric and electrochemical techniques, without labeling nor amplification. Investigations on mismatches nature and position have also been considered. For guanine-adenine (GA), guanine-thymine (GT) and guanine-guanine (GG) mismatches, the sensors responses present a dependence upon positions. Considering the capacitance variations and hybridization rates, results showed that gravimetric transduction is more sensitive than electrochemical one. Moreover, the highest value of GT hybridization rate (in the middle position) was found in accordance with the nearest-neighbor model, where the considered configuration appears as the most thermodynamically stable. For the real samples, where the electrochemical transduction, by combining capacitance and flat-band potential measurements, were found more sensitive, the results show that the realized sensor permits an unambiguous discrimination of recognition between fully complementary, non-complementary and single base mismatched targets, and even between the combination of differently matched strands.
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Affiliation(s)
- Zouhour Mazouz
- Laboratoire Méthodes et Techniques d'Analyse, INRAP, BiotechPole, 2020 Sidi-Thabet, Tunisia.
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14
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Shamsi MH, Kraatz HB. Interactions of Metal Ions with DNA and Some Applications. J Inorg Organomet Polym Mater 2012. [DOI: 10.1007/s10904-012-9694-8] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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15
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Alam MN, Shamsi MH, Kraatz HB. Scanning positional variations in single-nucleotide polymorphism of DNA: an electrochemical study. Analyst 2012; 137:4220-5. [DOI: 10.1039/c2an35420a] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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16
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Huy TQ, Hanh NTH, Thuy NT, Chung PV, Nga PT, Tuan MA. A novel biosensor based on serum antibody immobilization for rapid detection of viral antigens. Talanta 2011; 86:271-7. [PMID: 22063541 PMCID: PMC7111752 DOI: 10.1016/j.talanta.2011.09.012] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Revised: 09/09/2011] [Accepted: 09/09/2011] [Indexed: 11/18/2022]
Abstract
In this paper, we represent a label-free biosensor based on immobilization of serum antibodies for rapid detection of viral antigens. Human serum containing specific antibodies against Japanese encephalitis virus (JEV) was immobilized on a silanized surface of an interdigitated sensor via protein A/glutaraldehyde for electrical detection of JEV antigens. The effective immobilization of serum antibodies on the sensor surface was verified by Fourier transform infrared spectrometry and fluorescence microscopy. The signal of the biosensor obtained by the differential voltage converted from the change into non-Faradic impedance resulting from the specific binding of JEV antigens on the surface of the sensor. The detection analyzed indicates that the detection range of this biosensor is 1-10 μg/ml JEV antigens, with a detection limit of 0.75 μg/ml and that stable signals are measured in about 20 min. This study presents a useful biosensor with a high selectivity for rapid and simple detection of JEV antigens, and it also proposes the biosensor as a future diagnostic tool for rapid and direct detection of viral antigens in clinical samples for preliminary pathogenic screenings in the case of possible outbreaks.
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Affiliation(s)
- Tran Quang Huy
- National Institute of Hygiene and Epidemiology (NIHE), 1 Yersin Street, Hanoi, Viet Nam.
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17
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Hüsken N, Gębala M, Battistel A, La Mantia F, Schuhmann W, Metzler-Nolte N. Impact of single basepair mismatches on electron-transfer processes at Fc-PNA⋅DNA modified gold surfaces. Chemphyschem 2011; 13:131-9. [PMID: 21932268 DOI: 10.1002/cphc.201100578] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2011] [Indexed: 11/06/2022]
Abstract
Gold-surface grafted peptide nucleic acid (PNA) strands, which carry a redox-active ferrocene tag, present unique tools to electrochemically investigate their mechanical bending elasticity based on the kinetics of electron-transfer (ET) processes. A comparative study of the mechanical bending properties and the thermodynamic stability of a series of 12-mer Fc-PNA⋅DNA duplexes was carried out. A single basepair mismatch was integrated at all possible strand positions to provide nanoscopic insights into the physicochemical changes provoked by the presence of a single basepair mismatch with regard to its position within the strand. The ET processes at single mismatch Fc-PNA⋅DNA modified surfaces were found to proceed with increasing diffusion limitation and decreasing standard ET rate constants k(0) when the single basepair mismatch was dislocated along the strand towards its free-dangling Fc-modified end. The observed ET characteristics are considered to be due to a punctual increase in the strand elasticity at the mismatch position. The kinetic mismatch discrimination with respect to the fully-complementary duplex presents a basis for an electrochemical DNA sensing strategy based on the Fc-PNA⋅DNA bending dynamics for loosely packed monolayers. In a general sense, the strand elasticity presents a further physicochemical property which is affected by a single basepair mismatch which may possibly be used as a basis for future DNA sensing concepts for the specific detection of single basepair mismatches.
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Affiliation(s)
- Nina Hüsken
- Inorganic Chemistry I, Bioinorganic Chemistry, Faculty of Chemistry and Biochemistry, Ruhr-University Bochum, Universitätsstrasse 150, 44801 Bochum, Germany
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18
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Shamsi MH, Kraatz HB. Electrochemical identification of artificial oligonucleotides related to bovine species. Potential for identification of species based on mismatches in the mitochondrial cytochrome C1 oxidase gene. Analyst 2011; 136:4724-31. [PMID: 21847503 DOI: 10.1039/c1an15414a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Our studies show that electrochemical impedance spectroscopy (EIS) and scanning electrochemical microscopy (SECM) of films of ds-DNA on gold allow us to distinguish between mitochondrial DNA fragments of the cytochrome c(1) oxidase (mt-Cox1) of three related species of the subfamily 'Bovinae' (Bos taurus, Bison bison, and Bison bonasus). In EIS, a perfectly matched DNA gives rise to a considerably larger charge transfer resistance R(ct) compared to mismatched pairings. Differences in charge transfer resistance, ΔR(ct), before and after the addition of Zn(2+) ions provide an additional tool for identification. In addition, all ds-DNA films were studied by SECM and their kinetic parameters were determined. Perfectly matched ds-DNAs are readily distinguished from mismatched duplexes by their lower rate constants. Our system can be used multiple times by dehybridization and rehybridization of capture strands up to the 250 pmole level.
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Shamsi MH, Kraatz HB. The effects of oligonucleotide overhangs on the surface hybridization in DNA films: an impedance study. Analyst 2011; 136:3107-12. [PMID: 21701715 DOI: 10.1039/c1an15253j] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
While oligonucleotide hybridization and effects of nucleobase mismatches have been the intense focus of a number of electrochemical studies, the effects of the target strand length on the electrochemical response of oligonucleotide films have not been addressed yet. In this report, we have studied the electrochemical impedance of the oligonucleotide films having overhangs on either the target or the surface bound capture strand. Each system gives different impedance responses, which were interpreted with the help of modified Randles' equivalent. Results indicate that comparable sizes of target and capture strands ensure the higher hybridization efficiency and film order. The presence of nucleobase overhangs at the bottom of the film causes lower changes in charge transfer resistance (ΔR(CT)) after hybridization due to lower hybridization efficiency and presumably non-uniformity in the film. Nucleobase overhangs at the top of the film result in higher ΔR(CT) due to higher film order and accumulation of negative charges but appear not to cause any steric congestion.
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Affiliation(s)
- Mohtashim Hassan Shamsi
- Department of Chemistry, University of Western Ontario, 1151 Richmond, Street, London, Ontario, Canada N6A 5B7
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Kannan B, Williams DE, Booth MA, Travas-Sejdic J. High-Sensitivity, Label-Free DNA Sensors Using Electrochemically Active Conducting Polymers. Anal Chem 2011; 83:3415-21. [DOI: 10.1021/ac1033243] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Bhuvaneswari Kannan
- Polymer Electronic Research Centre, Department of Chemistry, University of Auckland, Private Bag 92019, Auckland, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington, New Zealand
| | - David E. Williams
- Polymer Electronic Research Centre, Department of Chemistry, University of Auckland, Private Bag 92019, Auckland, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington, New Zealand
| | - Marsilea A. Booth
- Polymer Electronic Research Centre, Department of Chemistry, University of Auckland, Private Bag 92019, Auckland, New Zealand
| | - Jadranka Travas-Sejdic
- Polymer Electronic Research Centre, Department of Chemistry, University of Auckland, Private Bag 92019, Auckland, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology, Wellington, New Zealand
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