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Khodayari Bavil A, Sticker D, Rothbauer M, Ertl P, Kim J. A microfluidic microparticle-labeled impedance sensor array for enhancing immunoassay sensitivity. Analyst 2021; 146:3289-3298. [PMID: 33999058 DOI: 10.1039/d0an02081h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
An impedimetric biosensor is used to measure electrical impedance changes in the presence of biomolecules from sinusoidal input voltages. In this paper, we present a new portable impedance-based biosensor platform to improve the sensitivity of immunoassays with microparticles as a label. Using a 2 × 4 interdigitated electrode array with a 10/10 μm electrode/gap and a miniaturized impedance analyzer, we performed immunoassays with microparticles by integrating a microfluidic channel to evaluate signal enhancement. First, to understand the material dependency of microparticles on the sensor array, magnetic, silica, and polystyrene microparticles were tested. Among these microparticles, magnetic microparticles presented a high signal enhancement with relevant stability from the sensor array. With the magnetic microparticles, we demonstrate a series of immunoassays to detect human tumor necrosis factor (TNF-α) and compare the level of signal enhancement by measuring the limit of detection (LOD). With the microparticles, we achieved over ten times improvement of LOD from sandwich immunoassays. By incorporating with sample preparation and flow manipulation systems, this impedance sensor array can be utilized for digital diagnostics for a real sample-in answer-out system.
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Affiliation(s)
- Ali Khodayari Bavil
- Department of Mechanical Engineering, University of Utah, Salt Lake City, UT, USA.
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2
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Evaluation of the biocompatibility of a PVA/SA scaffold with a human gingival fibroblast (HGF) by using electrochemical impedance spectroscopy. Bioelectrochemistry 2020; 131:107386. [DOI: 10.1016/j.bioelechem.2019.107386] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 09/07/2019] [Accepted: 09/09/2019] [Indexed: 12/16/2022]
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3
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Hondred JA, Stromberg LR, Mosher CL, Claussen JC. High-Resolution Graphene Films for Electrochemical Sensing via Inkjet Maskless Lithography. ACS NANO 2017; 11:9836-9845. [PMID: 28930433 DOI: 10.1021/acsnano.7b03554] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Solution-phase printing of nanomaterial-based graphene inks are rapidly gaining interest for fabrication of flexible electronics. However, scalable manufacturing techniques for high-resolution printed graphene circuits are still lacking. Here, we report a patterning technique [i.e., inkjet maskless lithography (IML)] to form high-resolution, flexible, graphene films (line widths down to 20 μm) that significantly exceed the current inkjet printing resolution of graphene (line widths ∼60 μm). IML uses an inkjet printed polymer lacquer as a sacrificial pattern, viscous spin-coated graphene, and a subsequent graphene lift-off to pattern films without the need for prefabricated stencils, templates, or cleanroom technology (e.g., photolithography). Laser annealing is employed to increase conductivity on thermally sensitive, flexible substrates [polyethylene terephthalate (PET)]. Laser annealing and subsequent platinum nanoparticle deposition substantially increases the electroactive nature of graphene as illustrated by electrochemical hydrogen peroxide (H2O2) sensing [rapid response (5 s), broad linear sensing range (0.1-550 μm), high sensitivity (0.21 μM/μA), and low detection limit (0.21 μM)]. Moreover, high-resolution, complex graphene circuits [i.e., interdigitated electrodes (IDE) with varying finger width and spacing] were created with IML and characterized via potassium chloride (KCl) electrochemical impedance spectroscopy (EIS). Results indicated that sensitivity directly correlates to electrode feature size as the IDE with the smallest finger width and spacing (50 and 50 μm) displayed the largest response to changes in KCl concentration (∼21 kΩ). These results indicate that the developed IML patterning technique is well-suited for rapid, solution-phase graphene film prototyping on flexible substrates for numerous applications including electrochemical sensing.
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Affiliation(s)
- John A Hondred
- Department of Mechanical Engineering and ‡Department of Genetics, Development and Cell Biology, Iowa State University , Ames, Iowa 50011, United States
| | - Loreen R Stromberg
- Department of Mechanical Engineering and ‡Department of Genetics, Development and Cell Biology, Iowa State University , Ames, Iowa 50011, United States
| | - Curtis L Mosher
- Department of Mechanical Engineering and ‡Department of Genetics, Development and Cell Biology, Iowa State University , Ames, Iowa 50011, United States
| | - Jonathan C Claussen
- Department of Mechanical Engineering and ‡Department of Genetics, Development and Cell Biology, Iowa State University , Ames, Iowa 50011, United States
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4
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Analysis of the evolution of the detection limits of electrochemical nucleic acid biosensors II. Anal Bioanal Chem 2017; 409:4335-4352. [DOI: 10.1007/s00216-017-0377-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 04/11/2017] [Accepted: 04/21/2017] [Indexed: 01/07/2023]
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5
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Castellarnau M, Ramón-Azcón J, Gonzalez-Quinteiro Y, López JF, Grimalt JO, Marco MP, Nieuwenhuijsen M, Picado A. Assessment of analytical methods to determine pyrethroids content of bednets. Trop Med Int Health 2016; 22:41-51. [PMID: 27717143 DOI: 10.1111/tmi.12794] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To present and evaluate simple, cost-effective tests to determine the amount of insecticide on treated materials. METHODS We developed and evaluated a competitive immunoassay on two different platforms: a label-free impedimetric biosensor (EIS biosensor) and a lateral flow. Both approaches were validated by gas chromatography (GC) and ELISA, gold standards for analytical methods and immunoassays, respectively. Finally, commercially available pyrethroid-treated ITN samples were analysed. Different extraction methods were evaluated. RESULTS Insecticide extraction by direct infusion of the ITN samples with dichloromethane and dioxane showed recovery efficiencies around 100% for insecticide-coated bednets, and >70% for insecticide-incorporated bednets. These results were comparable to those obtained with standard sonication methods. The competitive immunoassay characterisation with ELISA presented a dynamic range between 12 nm and 1.5 μm (coefficient of variation (CV) below 5%), with an IC50 at 138 nm, and a limit of detection (LOD) of 3.2 nm. EIS biosensor had a linear range between 1.7 nm and 61 nm (CV around 14%), with an IC50 at 10.4 nm, and a LOD of 0.6 nm. Finally, the lateral flow approach showed a dynamic range between 150 nm and 1.5 μm, an IC50 at 505 nm and a LOD of 67 nm. CONCLUSIONS ELISA can replace chromatography as an accurate laboratory technique to determine insecticide concentration in bednets. The lateral flow approach developed can be used to estimate ITN insecticide concentration in the field. This new technology, coupled to the new extraction methods, should provide reliable guidelines for ITN use and replacement in the field.
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Affiliation(s)
- Marc Castellarnau
- ISGlobal, Barcelona Centre for International Health Research (CRESIB), Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
| | - Javier Ramón-Azcón
- Nanobiotechnology for Diagnostics, Institute for Advanced Chemistry of Catalonia of the Spanish Council for Scientific Research, Barcelona, Spain.,CIBER de Bioingeniería, Biomateriales y Nanomedicina, Barcelona, Spain
| | | | - Jordi F López
- Institute of Environmental Assessment and Water Research, Barcelona, Spain
| | - Joan O Grimalt
- Institute of Environmental Assessment and Water Research, Barcelona, Spain
| | - María-Pilar Marco
- Nanobiotechnology for Diagnostics, Institute for Advanced Chemistry of Catalonia of the Spanish Council for Scientific Research, Barcelona, Spain.,CIBER de Bioingeniería, Biomateriales y Nanomedicina, Barcelona, Spain
| | - Mark Nieuwenhuijsen
- ISGlobal, Centre for Research in Environmental Epidemiology (CREAL), Universitat Pompeu Fabra (UPF), CIBER Epidemiología y Salud Pública (CIBERESP), Barcelona, Spain
| | - Albert Picado
- ISGlobal, Barcelona Centre for International Health Research (CRESIB), Hospital Clínic - Universitat de Barcelona, Barcelona, Spain
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6
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Ribeiro WC, Gonçalves LM, Liébana S, Pividori MI, Bueno PR. Molecular conductance of double-stranded DNA evaluated by electrochemical capacitance spectroscopy. NANOSCALE 2016; 8:8931-8938. [PMID: 27074378 DOI: 10.1039/c6nr01076h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Conductance was measured in two different double stranded DNA (both with 20 bases), the more conducting poly(dG)-poly(dC) (ds-DNAc) and the less conducting poly(dA)-poly(dT) (ds-DNAi), by means of Electrochemical Capacitance Spectroscopy (ECS). The use of the ECS approach, exemplified herein with DNA nanowires, is equally a suitable and time-dependent advantageous alternative for conductance measurement of molecular systems, additionally allowing better understanding of the alignment existing between molecular scale conductance and electron transfer rate.
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Affiliation(s)
- W C Ribeiro
- Instituto de Química, Universidade Estadual Paulista, (Nanobionics Research Group), CP 355, 14800-900, Araraquara, SP, Brazil
| | - L M Gonçalves
- Requimte, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto, Porto, Portugal
| | - S Liébana
- Grup de Sensors & Biosensors, Unitat de Química Analítica, Bloc de Ciencias e Biociencias, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - M I Pividori
- Grup de Sensors & Biosensors, Unitat de Química Analítica, Bloc de Ciencias e Biociencias, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - P R Bueno
- Instituto de Química, Universidade Estadual Paulista, (Nanobionics Research Group), CP 355, 14800-900, Araraquara, SP, Brazil
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Partel S, Dincer C, Kasemann S, Kieninger J, Edlinger J, Urban G. Lift-Off Free Fabrication Approach for Periodic Structures with Tunable Nano Gaps for Interdigitated Electrode Arrays. ACS NANO 2016; 10:1086-1092. [PMID: 26625012 DOI: 10.1021/acsnano.5b06405] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report a simple, low-cost and lift-off free fabrication approach for periodic structures with adjustable nanometer gaps for interdigitated electrode arrays (IDAs). It combines an initial structure and two deposition process steps; first a dielectric layer is deposited, followed by a metal evaporation. The initial structure can be realized by lithography or any other structuring technique (e.g., nano imprint, hot embossing or injection molding). This method allows the fabrication of nanometer sized gaps and completely eliminates the need for a lift-off process. Different substrate materials like silicon, Pyrex or polymers can be used. The electrode gap is controlled primarily by sputter deposition of the initial structure, and thus, adjustable gaps in the nanometer range can be realized independently of the mask or stamp pattern. Electrochemical characterizations using redox cycling in ferrocenemethanol (FcMeOH) demonstrate signal amplification factors of more than 110 together with collection factors higher than 99%. Furthermore, the correlation between the gap width and the amplification factor was studied to obtain an electrochemical performance assessment of the nano gap electrodes. The results demonstrate an exponential relationship between amplification factor and gap width.
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Affiliation(s)
- Stefan Partel
- Vorarlberg University of Applied Sciences , 6850 Dornbirn, Austria
- Department of Microsystem Engineering (IMTEK), University of Freiburg , 79110 Freiburg, Germany
| | - Can Dincer
- Department of Microsystem Engineering (IMTEK), University of Freiburg , 79110 Freiburg, Germany
- Freiburg Materials Research Center (FMF), University of Freiburg , 79104 Freiburg, Germany
| | - Stephan Kasemann
- Vorarlberg University of Applied Sciences , 6850 Dornbirn, Austria
| | - Jochen Kieninger
- Department of Microsystem Engineering (IMTEK), University of Freiburg , 79110 Freiburg, Germany
| | | | - Gerald Urban
- Department of Microsystem Engineering (IMTEK), University of Freiburg , 79110 Freiburg, Germany
- Freiburg Materials Research Center (FMF), University of Freiburg , 79104 Freiburg, Germany
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8
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Moghtader F, Congur G, Zareie HM, Erdem A, Piskin E. Impedimetric detection of pathogenic bacteria with bacteriophages using gold nanorod deposited graphite electrodes. RSC Adv 2016. [DOI: 10.1039/c6ra18884b] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Electrochemical impedance spectroscopy (EIS) is applied for the detection of bacteria using bacteriophages as a bioprobe together with gold nanorods (GNRs).
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Affiliation(s)
- Farzaneh Moghtader
- Hacettepe University
- Faculty of Engineering
- Chemical Engineering Department
- Graduate School of Science and Engineering – Nanotechnology and Nanomedicine Division
- Ankara
| | - Gulsah Congur
- Ege University
- Faculty of Pharmacy
- Analytical Chemistry Department
- İzmir
- Turkey
| | - Hadi M. Zareie
- İzmir Institute of Technology
- Department of Material Science and Engineering
- İzmir
- Turkey
- University of Technology
| | - Arzum Erdem
- Ege University
- Faculty of Pharmacy
- Analytical Chemistry Department
- İzmir
- Turkey
| | - Erhan Piskin
- Hacettepe University
- Faculty of Engineering
- Chemical Engineering Department
- Graduate School of Science and Engineering – Nanotechnology and Nanomedicine Division
- Ankara
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9
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Label-free cytokine micro- and nano-biosensing towards personalized medicine of systemic inflammatory disorders. Adv Drug Deliv Rev 2015; 95:90-103. [PMID: 26408791 DOI: 10.1016/j.addr.2015.09.005] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2015] [Revised: 08/17/2015] [Accepted: 09/10/2015] [Indexed: 01/31/2023]
Abstract
Systemic inflammatory disorders resulting from infection, trauma, surgery, and severe disease conditions pose serious threats to human health leading to organ dysfunction, organ failure, and mortality. The highly complex and dynamic nature of the immune system experiencing acute inflammation makes immunomodulatory therapy blocking pro-inflammatory cytokines very challenging. Successful therapy requires the ability to determine appropriate anti-cytokine drugs to be delivered at a right dose in a timely manner. Label-free micro- and nano-biosensors hold the potential to overcome the current challenges, enabling cytokine-targeted treatments to be tailored according to the immune status of an individual host with their unique cytokine biomarker detection capabilities. This review studies the recent progress in label-free cytokine biosensors, summarizes their performances and potential merits, and discusses future directions for their advancements to meet challenges towards personalized anti-cytokine drug delivery.
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10
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Impedimetric and amperometric bifunctional glucose biosensor based on hybrid organic–inorganic thin films. Bioelectrochemistry 2015; 101:1-7. [DOI: 10.1016/j.bioelechem.2014.06.007] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 04/23/2014] [Accepted: 06/17/2014] [Indexed: 11/22/2022]
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11
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Ternary DNA chip based on a novel thymine spacer group chemistry. Colloids Surf B Biointerfaces 2015; 125:270-6. [DOI: 10.1016/j.colsurfb.2014.10.058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Revised: 10/24/2014] [Accepted: 10/30/2014] [Indexed: 11/24/2022]
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12
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Mahadhy A, Ståhl-Wernersson E, Mattiasson B, Hedström M. Use of a capacitive affinity biosensor for sensitive and selective detection and quantification of DNA-A model study. BIOTECHNOLOGY REPORTS (AMSTERDAM, NETHERLANDS) 2014; 3:42-48. [PMID: 28626647 PMCID: PMC5466103 DOI: 10.1016/j.btre.2014.06.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Revised: 06/02/2014] [Accepted: 06/02/2014] [Indexed: 11/27/2022]
Abstract
A capacitive DNA-sensor model system was used to monitor the capture of complementary single-stranded DNAs. The sensor chip consisted of a gold electrode, which was carefully insulated with a polytyramine layer and covalently tagged with 25-mer oligo-C. As low as 10-11 moles per liter of target oligo-G could be detected by injecting 250 μL of sample. Elevated temperature was used to reduce non-specific hybridization. Less than 10% of non-target 25-mer oligo-T interacted nonspecifically with the oligo-C probes when hybridization process was performed at 50 °C. Studying the relationship of length of the analyte to the signal strength, the output from the capacitive DNA-sensor increased to almost the double; from 50 to 88-nF cm-2, when a 25-mer oligo-G was used instead of a 15-mer. By sandwich hybridization at room temperature, it was possible to further increase the signal, from 78-nF cm-2 for the target 50-mer oligo-G alone, to 114-nF cm-2.
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Affiliation(s)
| | | | | | - Martin Hedström
- Department of Biotechnology, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
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13
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Tokel O, Inci F, Demirci U. Advances in plasmonic technologies for point of care applications. Chem Rev 2014; 114:5728-52. [PMID: 24745365 PMCID: PMC4086846 DOI: 10.1021/cr4000623] [Citation(s) in RCA: 215] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Indexed: 12/12/2022]
Affiliation(s)
- Onur Tokel
- Demirci
Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical
School, Cambridge, Massachusetts 02139, United States
| | - Fatih Inci
- Demirci
Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical
School, Cambridge, Massachusetts 02139, United States
- Demirci
Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Stanford University School of Medicine, Canary Center at Stanford
for Cancer Early Detection, Palo
Alto, California 94304, United States
| | - Utkan Demirci
- Demirci
Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical
School, Cambridge, Massachusetts 02139, United States
- Division of Infectious Diseases, Brigham
and Women’s Hospital, Harvard Medical
School, Boston, Massachusetts 02115, United States
- Harvard-MIT
Health Sciences and Technology, Cambridge, Massachusetts 02139, United States
- Demirci
Bio-Acoustic-MEMS in Medicine (BAMM) Laboratory, Stanford University School of Medicine, Canary Center at Stanford
for Cancer Early Detection, Palo
Alto, California 94304, United States
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Mese F, Congur G, Erdem A. Voltammetric and impedimetric detection of DNA hybridization by using dendrimer modified graphite electrodes. J Electroanal Chem (Lausanne) 2014. [DOI: 10.1016/j.jelechem.2014.02.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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15
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Voltammetric and impedimetric DNA detection at single-use graphite electrodes modified with gold nanorods. Colloids Surf B Biointerfaces 2013; 112:61-6. [DOI: 10.1016/j.colsurfb.2013.07.040] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 06/16/2013] [Accepted: 07/17/2013] [Indexed: 01/08/2023]
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16
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Impedimetric detection of in situ interaction between anti-cancer drug bleomycin and DNA. Int J Biol Macromol 2013; 61:295-301. [PMID: 23892034 DOI: 10.1016/j.ijbiomac.2013.07.012] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2012] [Revised: 07/21/2013] [Accepted: 07/23/2013] [Indexed: 11/21/2022]
Abstract
Surface confined interaction of anti-cancer drug bleomycin (BLM) with nucleic acids: single stranded and double stranded DNA was investigated herein by using electrochemical impedance spectroscopy (EIS) technique in combination with a graphite sensor technology. The experimental conditions were optimized: such as, dsDNA concentration, BLM concentration and interaction time. The main features of impedimetric DNA biosensor, such as its detection limit and the repeatability, were also discussed. The in situ interaction of BLM with dsDNA was also tested impedimetrically in the absence or presence of other chemotherapeutic agents, such as mitomycin C (MC) and cis-platin (cis-DDP) for testing the selectivity.
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Analysis of the evolution of the detection limits of electrochemical DNA biosensors. Anal Bioanal Chem 2013; 405:3705-14. [DOI: 10.1007/s00216-012-6672-5] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Revised: 12/04/2012] [Accepted: 12/18/2012] [Indexed: 11/26/2022]
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18
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Li CZ, Karadeniz H, Canavar E, Erdem A. Electrochemical sensing of label free DNA hybridization related to breast cancer 1 gene at disposable sensor platforms modified with single walled carbon nanotubes. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2012.05.057] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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YAN XF, WANG MH, AN D. Progress of Interdigitated Array Microelectrodes Based Impedance Immunosensor. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2012. [DOI: 10.3724/sp.j.1096.2011.01601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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YAN XF, WANG MH, AN D. Progress of Interdigitated Array Microelectrodes Based Impedance Immunosensor. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2011. [DOI: 10.1016/s1872-2040(10)60478-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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Gebala M, Schuhmann W. Controlled orientation of DNA in a binary SAM as a key for the successful determination of DNA hybridization by means of electrochemical impedance spectroscopy. Chemphyschem 2010; 11:2887-95. [PMID: 20677315 DOI: 10.1002/cphc.201000210] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Determination of DNA hybridization at electrode surfaces modified with thiol-tethered single-stranded DNA (ssDNA) capture probes and co-assembled with short-chain thiol derivatives using electrochemical impedance spectroscopy requires a careful design of the electrode/electrolyte interface as well as an in-depth understanding of the processes at the interface during DNA hybridization. The influence of the electrode potential, the ssDNA coverage, the ionic strength, the nature of the thiol derivative and especially the Debye length are shown to have a significant impact on the impedance spectra. A mixed monolayer comprising--in addition to the ssDNA capture probe--both mercaptohexanol (MCH) and mercaptopropionic acid (MPA) is suggested as an interface design which allows a high efficiency of the DNA hybridization concomitantly with a reliable modulation of the charge-transfer resistance of the electrode upon hybridization.
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Affiliation(s)
- Magdalena Gebala
- Analytische Chemie-Elektroanalytik & Sensorik, Ruhr-Universität Bochum, Universitätsstr. 150, D-44780 Bochum, Germany
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Ona T, Shibata J. Advanced dynamic monitoring of cellular status using label-free and non-invasive cell-based sensing technology for the prediction of anticancer drug efficacy. Anal Bioanal Chem 2010; 398:2505-33. [DOI: 10.1007/s00216-010-4223-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2010] [Revised: 08/24/2010] [Accepted: 09/13/2010] [Indexed: 12/26/2022]
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Bonanni A, del Valle M. Use of nanomaterials for impedimetric DNA sensors: A review. Anal Chim Acta 2010; 678:7-17. [DOI: 10.1016/j.aca.2010.08.022] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2010] [Revised: 08/12/2010] [Accepted: 08/17/2010] [Indexed: 01/31/2023]
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25
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Singh KV, Whited AM, Ragineni Y, Barrett TW, King J, Solanki R. 3D nanogap interdigitated electrode array biosensors. Anal Bioanal Chem 2010; 397:1493-502. [PMID: 20419506 DOI: 10.1007/s00216-010-3682-z] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Revised: 03/17/2010] [Accepted: 03/23/2010] [Indexed: 10/19/2022]
Abstract
Three-dimensional interdigitated electrodes (IDEs) have been investigated as sensing elements for biosensors. Electric field and current density were simulated in the vicinity of these electrodes as a function of the electrode width, gap, and height to determine the optimum geometry. Both the height and the gap between the electrodes were found to have significant effect on the magnitude and distribution of the electric field and current density near the electrode surface, while the width of the electrodes was found to have a smaller effect on field strength and current density. IDEs were fabricated based on these simulations and their performance tested by detecting C-reactive protein (CRP), a stress-related protein and an important biomarker for inflammation, cardiovascular disease risk indicator, and postsurgical recuperation. CRP-specific antibodies were immobilized on the electrode surface and the formation of an immunocomplex (IC) with CRP was monitored. Electrochemical impedance spectroscopy (EIS) was employed as the detection technique. EIS data at various concentrations (1 pg/mL to 10 microg/mL) of CRP spiked in buffer or diluted human serum was collected and fitted into an equivalent electrical circuit model. Change in resistance was found to be the parameter most sensitive to change in CRP concentration. The sensor response was linear from 0.1 ng/mL to 1 microg/mL in both buffer and 5% human serum samples. The CRP samples were validated using a commercially available ELISA for CRP detection. Hence, the viability of IDEs and EIS for the detection of serum biomarkers was established without using labeled or probe molecules.
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Affiliation(s)
- Kanwar Vikas Singh
- Department of Physics, Portland State University, 1719 SW 10th Ave, Rm 128, Portland, OR 97201, USA.
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Qian P, Ai S, Yin H, Li J. Evaluation of DNA damage and antioxidant capacity of sericin by a DNA electrochemical biosensor based on dendrimer-encapsulated Au-Pd/chitosan composite. Mikrochim Acta 2010. [DOI: 10.1007/s00604-009-0280-x] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Baur J, Gondran C, Holzinger M, Defrancq E, Perrot H, Cosnier S. Label-Free Femtomolar Detection of Target DNA by Impedimetric DNA Sensor Based on Poly(pyrrole-nitrilotriacetic acid) Film. Anal Chem 2009; 82:1066-72. [DOI: 10.1021/ac9024329] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Jessica Baur
- Département de Chimie Moléculaire, UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier Grenoble I, BP 53, 38041 Grenoble cedex 9, France, and Laboratoire Interfaces et Systèmes Electrochimiques, UPR 15 CNRS, Université Pierre et Marie Curie Paris VI, cpr 133, 75252 Paris cedex 05, France
| | - Chantal Gondran
- Département de Chimie Moléculaire, UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier Grenoble I, BP 53, 38041 Grenoble cedex 9, France, and Laboratoire Interfaces et Systèmes Electrochimiques, UPR 15 CNRS, Université Pierre et Marie Curie Paris VI, cpr 133, 75252 Paris cedex 05, France
| | - Michael Holzinger
- Département de Chimie Moléculaire, UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier Grenoble I, BP 53, 38041 Grenoble cedex 9, France, and Laboratoire Interfaces et Systèmes Electrochimiques, UPR 15 CNRS, Université Pierre et Marie Curie Paris VI, cpr 133, 75252 Paris cedex 05, France
| | - Eric Defrancq
- Département de Chimie Moléculaire, UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier Grenoble I, BP 53, 38041 Grenoble cedex 9, France, and Laboratoire Interfaces et Systèmes Electrochimiques, UPR 15 CNRS, Université Pierre et Marie Curie Paris VI, cpr 133, 75252 Paris cedex 05, France
| | - Hubert Perrot
- Département de Chimie Moléculaire, UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier Grenoble I, BP 53, 38041 Grenoble cedex 9, France, and Laboratoire Interfaces et Systèmes Electrochimiques, UPR 15 CNRS, Université Pierre et Marie Curie Paris VI, cpr 133, 75252 Paris cedex 05, France
| | - Serge Cosnier
- Département de Chimie Moléculaire, UMR 5250, ICMG FR 2607, CNRS, Université Joseph Fourier Grenoble I, BP 53, 38041 Grenoble cedex 9, France, and Laboratoire Interfaces et Systèmes Electrochimiques, UPR 15 CNRS, Université Pierre et Marie Curie Paris VI, cpr 133, 75252 Paris cedex 05, France
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Arya SK, Solanki PR, Datta M, Malhotra BD. Recent advances in self-assembled monolayers based biomolecular electronic devices. Biosens Bioelectron 2009; 24:2810-7. [DOI: 10.1016/j.bios.2009.02.008] [Citation(s) in RCA: 169] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2008] [Revised: 02/06/2009] [Accepted: 02/10/2009] [Indexed: 11/25/2022]
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Qavi AJ, Washburn AL, Byeon JY, Bailey RC. Label-free technologies for quantitative multiparameter biological analysis. Anal Bioanal Chem 2009; 394:121-35. [PMID: 19221722 PMCID: PMC2667559 DOI: 10.1007/s00216-009-2637-8] [Citation(s) in RCA: 112] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2008] [Revised: 01/12/2009] [Accepted: 01/20/2009] [Indexed: 11/26/2022]
Abstract
In the postgenomic era, information is king and information-rich technologies are critically important drivers in both fundamental biology and medicine. It is now known that single-parameter measurements provide only limited detail and that quantitation of multiple biomolecular signatures can more fully illuminate complex biological function. Label-free technologies have recently attracted significant interest for sensitive and quantitative multiparameter analysis of biological systems. There are several different classes of label-free sensors that are currently being developed both in academia and in industry. In this critical review, we highlight, compare, and contrast some of the more promising approaches. We describe the fundamental principles of these different methods and discuss advantages and disadvantages that might potentially help one in selecting the appropriate technology for a given bioanalytical application.
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Affiliation(s)
- Abraham J. Qavi
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave, Urbana, IL 61801
| | - Adam L. Washburn
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave, Urbana, IL 61801
| | - Ji-Yeon Byeon
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave, Urbana, IL 61801
| | - Ryan C. Bailey
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave, Urbana, IL 61801
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Bonanni A, Pividori MI, Campoy S, Barbé J, del Valle M. Impedimetric detection of double-tagged PCR products using novel amplification procedures based on gold nanoparticles and Protein G. Analyst 2009; 134:602-8. [DOI: 10.1039/b815502j] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Singh R, Prasad R, Sumana G, Arora K, Sood S, Gupta RK, Malhotra BD. STD sensor based on nucleic acid functionalized nanostructured polyaniline. Biosens Bioelectron 2008; 24:2232-8. [PMID: 19162465 DOI: 10.1016/j.bios.2008.11.030] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2008] [Revised: 11/27/2008] [Accepted: 11/28/2008] [Indexed: 10/21/2022]
Abstract
STD (sexually transmitted disease, Gonorrhoea) sensor based on nucleic acid probe (from Opa, a multi-copy gene of Neisseria gonorrhoeae) functionalized nanostructured-polyaniline coated onto indium-tin-oxide-coated glass plate has been fabricated using avidin-biotin as cross-linking agent. This DNA functionalized electrode can specifically detect upto 0.5 x 10(-15)M of complementary target within 60s of hybridization time at 25 degrees C by differential pulse voltammetry (DPV) using methylene blue as electro-active DNA hybridization indicator. This highly sensitive and specific nucleic acid functionalized nanostructured-polyaniline electrode can distinguish presence of N. gonorrhoeae from Neisseria meningitidis and Escherichia coli culture and spiked samples from the urethral swabs of the patients.
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Affiliation(s)
- Renu Singh
- Biomolecular Electronics and Conducting Polymer Research Group, National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi 110012, India
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Bratov A, Ramón-Azcón J, Abramova N, Merlos A, Adrian J, Sánchez-Baeza F, Marco MP, Domínguez C. Three-dimensional interdigitated electrode array as a transducer for label-free biosensors. Biosens Bioelectron 2008; 24:729-35. [DOI: 10.1016/j.bios.2008.06.057] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2008] [Revised: 06/17/2008] [Accepted: 06/23/2008] [Indexed: 11/15/2022]
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Kong J, Zhang H, Chen X, Balasubramanian N, Kwong D. Ultrasensitive electrical detection of nucleic acids by hematin catalysed silver nanoparticle formation in sub-microgapped biosensors. Biosens Bioelectron 2008; 24:793-7. [DOI: 10.1016/j.bios.2008.06.047] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2008] [Revised: 06/12/2008] [Accepted: 06/30/2008] [Indexed: 10/21/2022]
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34
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Solanki PR, Prabhakar N, Pandey MK, Malhotra BD. Nucleic acid sensor for insecticide detection. J Mol Recognit 2008; 21:217-23. [DOI: 10.1002/jmr.888] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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35
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Prabhakar N, Sumana G, Arora K, Singh H, Malhotra B. Improved electrochemical nucleic acid biosensor based on polyaniline-polyvinyl sulphonate. Electrochim Acta 2008. [DOI: 10.1016/j.electacta.2007.12.062] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Lisdat F, Schäfer D. The use of electrochemical impedance spectroscopy for biosensing. Anal Bioanal Chem 2008; 391:1555-67. [PMID: 18414837 DOI: 10.1007/s00216-008-1970-7] [Citation(s) in RCA: 439] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2007] [Revised: 02/08/2008] [Accepted: 02/09/2008] [Indexed: 11/30/2022]
Abstract
This review introduces the basic concepts and terms associated with impedance and techniques of measuring impedance. The focus of this review is on the application of this transduction method for sensing purposes. Examples of its use in combination with enzymes, antibodies, DNA and with cells will be described. Important fields of application include immune and nucleic acid analysis. Special attention is devoted to the various electrode design and amplification schemes developed for sensitivity enhancement. Electrolyte insulator semiconductor (EIS) structures will be treated separately.
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Affiliation(s)
- F Lisdat
- Biosystems Technology, Wildau University of Applied Sciences, 15745, Wildau, Germany.
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37
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Dharuman V, Hahn JH. Label free electrochemical DNA hybridization discrimination effects at the binary and ternary mixed monolayers of single stranded DNA/diluent/s in presence of cationic intercalators. Biosens Bioelectron 2008; 23:1250-8. [DOI: 10.1016/j.bios.2007.11.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2007] [Revised: 10/18/2007] [Accepted: 11/21/2007] [Indexed: 11/15/2022]
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Pänke O, Balkenhohl T, Kafka J, Schäfer D, Lisdat F. Impedance spectroscopy and biosensing. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2008; 109:195-237. [PMID: 17992488 DOI: 10.1007/10_2007_081] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
This chapter introduces the basic terms of impedance and the technique of impedance measurements. Furthermore, an overview of the application of this transduction method for analytical purposes will be given. Examples for combination with enzymes, antibodies, DNA but also for the analysis of living cells will be described. Special attention is devoted to the different electrode design and amplification schemes developed for sensitivity enhancement. Finally, the last two sections will show examples from the label-free determination of DNA and the sensorial detection of autoantibodies involved in celiac disease.
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Affiliation(s)
- O Pänke
- Biosystems Technology, Wildau University of Applied Sciences, Bahnhofstrasse 1, 15745 Wildau, Germany
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39
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Kukol A, Li P, Estrela P, Ko-Ferrigno P, Migliorato P. Label-free electrical detection of DNA hybridization for the example of influenza virus gene sequences. Anal Biochem 2007; 374:143-53. [PMID: 18023405 DOI: 10.1016/j.ab.2007.10.035] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2007] [Revised: 10/17/2007] [Accepted: 10/22/2007] [Indexed: 10/22/2022]
Abstract
Microarrays based on DNA-DNA hybridization are potentially useful for detecting and subtyping viruses but require fluorescence labeling and imaging equipment. We investigated a label-free electrical detection system using electrochemical impedance spectroscopy that is able to detect hybridization of DNA target sequences derived from avian H5N1 influenza virus to gold surface-attached single-stranded DNA oligonucleotide probes. A 23-nt probe is able to detect a 120-nt base fragment of the influenza A hemagglutinin gene sequence. We describe a novel method of data analysis that is compatible with automatic measurement without operator input, contrary to curve fitting used in conventional electrochemical impedance spectroscopy (EIS) data analysis. A systematic investigation of the detection signal for various spacer molecules between the oligonucleotide probe and the gold surface revealed that the signal/background ratio improves as the length of the spacer increases, with a 12- to 18-atom spacer element being optimal. The optimal spacer molecule allows a detection limit between 30 and 100 fmol DNA with a macroscopic gold disc electrode of 1 mm radius. The dependence of the detection signal on the concentration of a 23-nt target follows a binding curve with an approximate 1:1 stoichiometry and a dissociation constant of KD=13+/-4 nM at 295 K.
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Affiliation(s)
- Andreas Kukol
- School of Life Sciences, University of Hertfordshire, Hatfield AL10 9AB, UK.
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40
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Bonanni A, Pividori MI, del Valle M. Application of the avidin-biotin interaction to immobilize DNA in the development of electrochemical impedance genosensors. Anal Bioanal Chem 2007; 389:851-61. [PMID: 17676315 DOI: 10.1007/s00216-007-1490-x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2007] [Revised: 06/28/2007] [Accepted: 07/04/2007] [Indexed: 11/25/2022]
Abstract
Impedance spectroscopy is a rapidly developing technique for the transduction of biosensing events at the surface of an electrode. The immobilization of biomaterial as DNA strands on the electrode surface alters the capacitance and the interfacial electron transfer resistance of the conductive electrodes. The impedimetric technique is an effective method of probing modifications to these interfacial properties, thus allowing the differentiation of hybridization events. In this work, an avidin bulk-modified graphite-epoxy biocomposite (Av-GEB) was employed to immobilize biotinylated oligonucleotides as well as double-stranded DNA onto the electrode surface. Impedance spectra were recorded to detect the change in the interfacial electron transfer resistance (R (et)) of the redox marker ferrocyanide/ferricyanide at a polarization potential of +0.17 V. The sensitivity of the technique and the good reproducibility of the results obtained with it confirm the validity of this method based on a universal affinity biocomposite platform coupled with the impedimetric technique.
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Affiliation(s)
- A Bonanni
- Sensors and Biosensors Group, Department of Chemistry, Autonomous University of Barcelona, Edifici Cn, 08193 Bellaterra, Barcelona, Spain
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41
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Arora K, Prabhakar N, Chand S, Malhotra BD. Ultrasensitive DNA hybridization biosensor based on polyaniline. Biosens Bioelectron 2007; 23:613-20. [PMID: 17855071 DOI: 10.1016/j.bios.2007.07.010] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2007] [Revised: 07/05/2007] [Accepted: 07/09/2007] [Indexed: 11/24/2022]
Abstract
Ultrasensitive DNA hybridization biosensor based on polyaniline (PANI) electrochemically deposited onto Pt disc electrode has been fabricated using biotin-avidin as indirect coupling agent to immobilize single-stranded 5'-biotin end-labeled polydeoxycytidine (BdC) probes and 5'-biotin end-labeled 35 base-long oligonucleotide probe (BdE) to detect complementary target, using both direct electrochemical oxidation of guanine and redox electroactive indicator methylene blue (MB), respectively. These polyaniline-based disc electrodes have been characterized using differential pulse voltammetry (DPV), Fourier transform infrared spectroscopy (FT-IR), impedance measurements and scanning electron microscopy (SEM) techniques, respectively. Compared to direct electrochemical oxidation of guanine, hybridization detection using MB results in the enhanced detection limit by about 100 times. These DNA immobilized PANI electrodes have hybridization response time of about 60 s.
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Affiliation(s)
- Kavita Arora
- Biomolecular Electronics and Conducting Polymer Research Group, National Physical Laboratory, Dr KS Krishnan Marg, New Delhi, India
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42
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Prabhakar N, Arora K, Singh SP, Singh H, Malhotra BD. DNA entrapped polypyrrole–polyvinyl sulfonate film for application to electrochemical biosensor. Anal Biochem 2007; 366:71-9. [PMID: 17445760 DOI: 10.1016/j.ab.2007.03.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2007] [Accepted: 03/08/2007] [Indexed: 10/23/2022]
Abstract
Double-stranded calf thymus (dsCT)-DNA was electrochemically entrapped into polypyrrole-polyvinyl sulfonate (PPy-PVS) films deposited onto indium tin oxide (ITO) coated glass plates. These dsCT-DNA entrapped PPy-PVS/ITO films were characterized using cyclic voltammetry, UV-visible, Fourier transform infrared (FT-IR), scanning tunneling microscopy (STM), and electrochemical impedance measurements. Attempts made to use these dsCT-DNA entrapped PPy-PVS/ITO films for detection of 2-aminoanthracene (0.001-6.0 ppm) and 3-chlorophenol (0.01-55.0 ppm) revealed a response time of 30s and a shelf life of approximately 25 weeks when stored under desiccated conditions at 25 degrees C. The addition of salts such as Ca(2+) (250 ppm), Mg(2+) (200 ppm), Cl(-) (1560 ppm), and Na(+) (150 ppm) ions contained in water does not affect the observed amperometric response of the disposable dsCT-DNA entrapped PPy-PVS film-based electrochemical biosensor.
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Affiliation(s)
- Nirmal Prabhakar
- Biomolecular Electronics and Conducting Polymer Research Group, National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi 110012, India
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43
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Dharuman V, Nebling E, Grunwald T, Albers J, Blohm L, Elsholz B, Wörl R, Hintsche R. DNA hybridization detection on electrical microarrays using coulostatic pulse technique. Biosens Bioelectron 2006; 22:744-51. [PMID: 16574397 DOI: 10.1016/j.bios.2006.02.014] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2005] [Revised: 02/14/2006] [Accepted: 02/20/2006] [Indexed: 11/17/2022]
Abstract
We demonstrated a novel application of transient coulostatic pulse technique for the detection of label free DNA hybridization on nm-sized gold interdigitated ultramicroelectrode arrays (Au-IDA) made in silicon technology. The array consists of eight different positions with an Au-IDA pair at each position arranged on the Si-based Biochip. Immobilization of capture probes onto the Au-IDA was accomplished by self-assembling of thiol-modified oligonucleotides. Target hybridization was indicated by a change in the magnitude of the time dependant potential relaxation curve in presence of electroactive Fe(CN)(6)(3-) in the phosphate buffer solution. While complementary DNA hybridization showed 50% increase in the relaxation potential, the non-complementary DNA showed a negligible change. A constant behaviour was noted for all positions. The dsDNA specific intercalating molecule, methylene blue, was found to be enhancing the discrimination effect. The changes in the relaxation potential curves were further corroborated following the ELISA like experiments using ExtraAvidine alkaline phosphatase labelling and redox recycling of para-aminophenol phosphate at IDAs. The coulostatic pulse technique was shown to be useful for identifying DNA sequences from brain tumour gene CK20, human herpes simplex virus, cytomegalovirus, Epstein-Barr virus and M13 phage. Compared to the hybridization of short chain ONTs (27 mers), the hybridization of long chain M13 phage DNA showed three times higher increase in the relaxation curves. The method is fast enough to monitor hybridization interactions in milli or microsecond time scales and is well suitable for miniaturization and integration compared to the common impedance techniques for developing capacitative DNA sensors.
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Affiliation(s)
- V Dharuman
- Department of Biotechnical Microsystems, Fraunhofer Institute for Silicon Technology, Fraunhoferstrasse 1, D-25524 Itzehoe, Germany
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