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Chen YS, Huang CH, Pai PC, Seo J, Lei KF. A Review on Microfluidics-Based Impedance Biosensors. BIOSENSORS 2023; 13:bios13010083. [PMID: 36671918 PMCID: PMC9855525 DOI: 10.3390/bios13010083] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 12/20/2022] [Accepted: 12/28/2022] [Indexed: 05/30/2023]
Abstract
Electrical impedance biosensors are powerful and continuously being developed for various biological sensing applications. In this line, the sensitivity of impedance biosensors embedded with microfluidic technologies, such as sheath flow focusing, dielectrophoretic focusing, and interdigitated electrode arrays, can still be greatly improved. In particular, reagent consumption reduction and analysis time-shortening features can highly increase the analytical capabilities of such biosensors. Moreover, the reliability and efficiency of analyses are benefited by microfluidics-enabled automation. Through the use of mature microfluidic technology, complicated biological processes can be shrunk and integrated into a single microfluidic system (e.g., lab-on-a-chip or micro-total analysis systems). By incorporating electrical impedance biosensors, hand-held and bench-top microfluidic systems can be easily developed and operated by personnel without professional training. Furthermore, the impedance spectrum provides broad information regarding cell size, membrane capacitance, cytoplasmic conductivity, and cytoplasmic permittivity without the need for fluorescent labeling, magnetic modifications, or other cellular treatments. In this review article, a comprehensive summary of microfluidics-based impedance biosensors is presented. The structure of this article is based on the different substrate material categorizations. Moreover, the development trend of microfluidics-based impedance biosensors is discussed, along with difficulties and challenges that may be encountered in the future.
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Affiliation(s)
- Yu-Shih Chen
- Department of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
| | - Chun-Hao Huang
- Department of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
| | - Ping-Ching Pai
- Department of Radiation Oncology, Linkou Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan
| | - Jungmok Seo
- Department of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
- Department of Electrical & Electronic Engineering, Yonsei University, Seoul 120-749, Republic of Korea
| | - Kin Fong Lei
- Department of Biomedical Engineering, Chang Gung University, Taoyuan 33302, Taiwan
- Department of Radiation Oncology, Linkou Chang Gung Memorial Hospital, Taoyuan 33305, Taiwan
- Department of Electrical & Electronic Engineering, Yonsei University, Seoul 120-749, Republic of Korea
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2
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Novel Micro-Nano Optoelectronic Biosensor for Label-Free Real-Time Biofilm Monitoring. BIOSENSORS-BASEL 2021; 11:bios11100361. [PMID: 34677317 PMCID: PMC8533833 DOI: 10.3390/bios11100361] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 09/18/2021] [Accepted: 09/27/2021] [Indexed: 12/02/2022]
Abstract
According to the World Health Organization forecasts, AntiMicrobial Resistance (AMR) is expected to become one of the leading causes of death worldwide in the following decades. The rising danger of AMR is caused by the overuse of antibiotics, which are becoming ineffective against many pathogens, particularly in the presence of bacterial biofilms. In this context, non-destructive label-free techniques for the real-time study of the biofilm generation and maturation, together with the analysis of the efficiency of antibiotics, are in high demand. Here, we propose the design of a novel optoelectronic device based on a dual array of interdigitated micro- and nanoelectrodes in parallel, aiming at monitoring the bacterial biofilm evolution by using optical and electrical measurements. The optical response given by the nanostructure, based on the Guided Mode Resonance effect with a Q-factor of about 400 and normalized resonance amplitude of about 0.8, allows high spatial resolution for the analysis of the interaction between planktonic bacteria distributed in small colonies and their role in the biofilm generation, calculating a resonance wavelength shift variation of 0.9 nm in the presence of bacteria on the surface, while the electrical response with both micro- and nanoelectrodes is necessary for the study of the metabolic state of the bacteria to reveal the efficacy of antibiotics for the destruction of the biofilm, measuring a current change of 330 nA when a 15 µm thick biofilm is destroyed with respect to the absence of biofilm.
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3
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Kremers T, Tintelott M, Pachauri V, Vu XT, Ingebrandt S, Schnakenberg U. Microelectrode Combinations of Gold and Polypyrrole Enable Highly Stable Two‐electrode Electrochemical Impedance Spectroscopy Measurements under Turbulent Flow Conditions. ELECTROANAL 2020. [DOI: 10.1002/elan.202060105] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Tom Kremers
- Institute of Materials in Electrical Engineering 1 RWTH Aachen University Sommerfeldstraße 24 D-52074 Aachen Germany
| | - Marcel Tintelott
- Institute of Materials in Electrical Engineering 1 RWTH Aachen University Sommerfeldstraße 24 D-52074 Aachen Germany
| | - Vivek Pachauri
- Institute of Materials in Electrical Engineering 1 RWTH Aachen University Sommerfeldstraße 24 D-52074 Aachen Germany
| | - Xuan Thang Vu
- Institute of Materials in Electrical Engineering 1 RWTH Aachen University Sommerfeldstraße 24 D-52074 Aachen Germany
| | - Sven Ingebrandt
- Institute of Materials in Electrical Engineering 1 RWTH Aachen University Sommerfeldstraße 24 D-52074 Aachen Germany
| | - Uwe Schnakenberg
- Institute of Materials in Electrical Engineering 1 RWTH Aachen University Sommerfeldstraße 24 D-52074 Aachen Germany
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4
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Siller IG, Preuss JA, Urmann K, Hoffmann MR, Scheper T, Bahnemann J. 3D-Printed Flow Cells for Aptamer-Based Impedimetric Detection of E. coli Crooks Strain. SENSORS 2020; 20:s20164421. [PMID: 32784793 PMCID: PMC7472219 DOI: 10.3390/s20164421] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 08/03/2020] [Accepted: 08/05/2020] [Indexed: 01/16/2023]
Abstract
Electrochemical spectroscopy enables rapid, sensitive, and label-free analyte detection without the need of extensive and laborious labeling procedures and sample preparation. In addition, with the emergence of commercially available screen-printed electrodes (SPEs), a valuable, disposable alternative to costly bulk electrodes for electrochemical (bio-)sensor applications was established in recent years. However, applications with bare SPEs are limited and many applications demand additional/supporting structures or flow cells. Here, high-resolution 3D printing technology presents an ideal tool for the rapid and flexible fabrication of tailor-made, experiment-specific systems. In this work, flow cells for SPE-based electrochemical (bio-)sensor applications were designed and 3D printed. The successful implementation was demonstrated in an aptamer-based impedimetric biosensor approach for the detection of Escherichia coli (E. coli) Crooks strain as a proof of concept. Moreover, further developments towards a 3D-printed microfluidic flow cell with an integrated micromixer also illustrate the great potential of high-resolution 3D printing technology to enable homogeneous mixing of reagents or sample solutions in (bio-)sensor applications.
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Affiliation(s)
- Ina G. Siller
- Institute of Technical Chemistry, Leibniz University Hannover, Callinstraße 5, 30167 Hannover, Germany; (I.G.S.); (J.-A.P.); (T.S)
| | - John-Alexander Preuss
- Institute of Technical Chemistry, Leibniz University Hannover, Callinstraße 5, 30167 Hannover, Germany; (I.G.S.); (J.-A.P.); (T.S)
| | - Katharina Urmann
- Department of Environmental Science and Engineering, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA; (K.U.); (M.R.H.)
| | - Michael R. Hoffmann
- Department of Environmental Science and Engineering, California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125, USA; (K.U.); (M.R.H.)
| | - Thomas Scheper
- Institute of Technical Chemistry, Leibniz University Hannover, Callinstraße 5, 30167 Hannover, Germany; (I.G.S.); (J.-A.P.); (T.S)
| | - Janina Bahnemann
- Institute of Technical Chemistry, Leibniz University Hannover, Callinstraße 5, 30167 Hannover, Germany; (I.G.S.); (J.-A.P.); (T.S)
- Correspondence: ; Tel.: +49-511-762-2568
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Trotter M, Borst N, Thewes R, von Stetten F. Review: Electrochemical DNA sensing – Principles, commercial systems, and applications. Biosens Bioelectron 2020; 154:112069. [DOI: 10.1016/j.bios.2020.112069] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 01/28/2020] [Accepted: 02/01/2020] [Indexed: 02/06/2023]
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Ultrasensitive and label-free biosensor for the detection of Plasmodium falciparum histidine-rich protein II in saliva. Sci Rep 2019; 9:17495. [PMID: 31767887 PMCID: PMC6877566 DOI: 10.1038/s41598-019-53852-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Accepted: 11/06/2019] [Indexed: 11/08/2022] Open
Abstract
Malaria elimination is a global public health priority. To fulfil the demands of elimination diagnostics, we have developed an interdigitated electrode sensor platform targeting the Plasmodium falciparum Histidine Rich Protein 2 (PfHRP2) protein in saliva samples. A protocol for frequency-specific PfHRP2 detection in phosphate buffered saline was developed, yielding a sensitivity of 2.5 pg/mL based on change in impedance magnitude of the sensor. This protocol was adapted and optimized for use in saliva with a sensitivity of 25 pg/mL based on change in resistance. Further validation demonstrated detection in saliva spiked with PfHRP2 from clinical isolates in 8 of 11 samples. With a turnaround time of ~2 hours, the label-free platform based on impedance sensors has the potential for miniaturization into a point-of-care diagnostic device for malaria elimination.
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A review of microfabricated electrochemical biosensors for DNA detection. Biosens Bioelectron 2019; 134:57-67. [DOI: 10.1016/j.bios.2019.03.055] [Citation(s) in RCA: 89] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 03/21/2019] [Accepted: 03/26/2019] [Indexed: 02/07/2023]
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Nguyet NT, Yen LTH, Doan VY, Hoang NL, Van Thu V, lan H, Trung T, Pham VH, Tam PD. A label-free and highly sensitive DNA biosensor based on the core-shell structured CeO2-NR@Ppy nanocomposite for Salmonella detection. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 96:790-797. [DOI: 10.1016/j.msec.2018.11.059] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 10/19/2018] [Accepted: 11/27/2018] [Indexed: 10/27/2022]
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Reduced graphene-oxide transducers for biosensing applications beyond the Debye-screening limit. Biosens Bioelectron 2018; 130:352-359. [PMID: 30269960 DOI: 10.1016/j.bios.2018.09.045] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Revised: 09/01/2018] [Accepted: 09/12/2018] [Indexed: 01/20/2023]
Abstract
In the field of label-free biosensing, various transducer materials and strategies are under investigation to overcome the Debye-screening limitation of charged biomolecules. We demonstrate an in-line, impedimetric aptasensor with reduced graphene-oxide (rGO) thin films as transducers to detect prostate specific antigens (PSA) in a physiological buffer solution. Unlike classical electrochemical impedance spectroscopy (EIS), this direct, label-free and fully-electronic biosensor approach does not need any redox markers. As specific capture molecules, short anti-PSA aptamers ensured a close binding of the target molecules to the transducer surfaces. Results showed a limit of detection smaller than 33 pM of PSA and a wide detection range from 0.033 to 330 nM fully covering the clinically relevant range of PSA (0.115-0.290 nM). This promising performance can be attributed to the bipolar electronic transport characteristics of the ultra-thin rGO layers similar to pristine graphene. The attachment of target biomolecules to the films changes the resistance of the rGO thin films. Such an in-line EIS configuration with rGO thin films opens promising prospects for biosensing beyond the Debye-screening limitation, which is a major challenge for conventional semiconductor field-effect devices towards clinical applications.
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10
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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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11
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A Label-Free, Quantitative Fecal Hemoglobin Detection Platform for Colorectal Cancer Screening. BIOSENSORS-BASEL 2017; 7:bios7020019. [PMID: 28475117 PMCID: PMC5487963 DOI: 10.3390/bios7020019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 05/02/2017] [Accepted: 05/03/2017] [Indexed: 01/04/2023]
Abstract
The early detection of colorectal cancer is vital for disease management and patient survival. Fecal hemoglobin detection is a widely-adopted method for screening and early diagnosis. Fecal Immunochemical Test (FIT) is favored over the older generation chemical based Fecal Occult Blood Test (FOBT) as it does not require dietary or drug restrictions, and is specific to human blood from the lower digestive tract. To date, no quantitative FIT platforms are available for use in the point-of-care setting. Here, we report proof of principle data of a novel low cost quantitative fecal immunochemical-based biosensor platform that may be further developed into a point-of-care test in low-resource settings. The label-free prototype has a lower limit of detection (LOD) of 10 µg hemoglobin per gram (Hb/g) of feces, comparable to that of conventional laboratory based quantitative FIT diagnostic systems.
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12
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Bratov A, Brosel-Oliu S, Abramova N. Label-Free Impedimetric Biosensing Using 3D Interdigitated Electrodes. SPRINGER SERIES ON CHEMICAL SENSORS AND BIOSENSORS 2017. [DOI: 10.1007/5346_2017_7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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13
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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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14
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Velmanickam L, Laudenbach D, Nawarathna D. Dielectrophoretic label-free immunoassay for rare-analyte quantification in biological samples. Phys Rev E 2016; 94:042408. [PMID: 27841465 DOI: 10.1103/physreve.94.042408] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Indexed: 06/06/2023]
Abstract
The current gold standard for detecting or quantifying target analytes from blood samples is the ELISA (enzyme-linked immunosorbent assay). The detection limit of ELISA is about 250 pg/ml. However, to quantify analytes that are related to various stages of tumors including early detection requires detecting well below the current limit of the ELISA test. For example, Interleukin 6 (IL-6) levels of early oral cancer patients are <100 pg/ml and the prostate specific antigen level of the early stage of prostate cancer is about 1 ng/ml. Further, it has been reported that there are significantly less than 1pg/mL of analytes in the early stage of tumors. Therefore, depending on the tumor type and the stage of the tumors, it is required to quantify various levels of analytes ranging from ng/ml to pg/ml. To accommodate these critical needs in the current diagnosis, there is a need for a technique that has a large dynamic range with an ability to detect extremely low levels of target analytes (<pg/ml). To address this gap, we here report on a label-free, high-throughput technique based on dielectrophoresis. This technique is capable of quantifying target analytes down to a few thousands of molecules (∼zmoles).
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Affiliation(s)
- Logeeshan Velmanickam
- Department of Electrical and Computer Engineering, North Dakota State University, Fargo, North Dakota, 58102-6050, USA
| | - Darrin Laudenbach
- Department of Electrical and Computer Engineering, North Dakota State University, Fargo, North Dakota, 58102-6050, USA
| | - Dharmakeerthi Nawarathna
- Department of Electrical and Computer Engineering, North Dakota State University, Fargo, North Dakota, 58102-6050, USA
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15
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Medina-Sánchez M, Ibarlucea B, Pérez N, Karnaushenko DD, Weiz SM, Baraban L, Cuniberti G, Schmidt OG. High-Performance Three-Dimensional Tubular Nanomembrane Sensor for DNA Detection. NANO LETTERS 2016; 16:4288-96. [PMID: 27266478 DOI: 10.1021/acs.nanolett.6b01337] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
We report an ultrasensitive label-free DNA biosensor with fully on-chip integrated rolled-up nanomembrane electrodes. The hybridization of complementary DNA strands (avian influenza virus subtype H1N1) is selectively detected down to attomolar concentrations, an unprecedented level for miniaturized sensors without amplification. Impedimetric DNA detection with such a rolled-up biosensor shows 4 orders of magnitude sensitivity improvement over its planar counterpart. Furthermore, it is observed that the impedance response of the proposed device is contrary to the expected behavior due to its particular geometry. To further investigate this difference, a thorough model analysis of the measured signal and the electric field calculation is performed, revealing enhanced electron hopping/tunneling along the DNA chains due to an enriched electric field inside the tube. Likewise, conformational changes of DNA might also contribute to this effect. Accordingly, these highly integrated three-dimensional sensors provide a tool to study electrical properties of DNA under versatile experimental conditions and open a new avenue for novel biosensing applications (i.e., for protein, enzyme detection, or monitoring of cell behavior under in vivo like conditions).
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Affiliation(s)
- Mariana Medina-Sánchez
- Institute for Integrative Nanosciences, IFW Dresden , Helmholtzstraße 20, 01069 Dresden, Germany
| | - Bergoi Ibarlucea
- Institute of Materials Science and Max Bergmann Center for Biomaterials, Center for Advancing Electronics Dresden (CfAED), Dresden University of Technology , 01062 Dresden, Germany
| | - Nicolás Pérez
- Institute for Integrative Nanosciences, IFW Dresden , Helmholtzstraße 20, 01069 Dresden, Germany
| | - Dmitriy D Karnaushenko
- Institute for Integrative Nanosciences, IFW Dresden , Helmholtzstraße 20, 01069 Dresden, Germany
| | - Sonja M Weiz
- Institute for Integrative Nanosciences, IFW Dresden , Helmholtzstraße 20, 01069 Dresden, Germany
| | - Larysa Baraban
- Institute of Materials Science and Max Bergmann Center for Biomaterials, Center for Advancing Electronics Dresden (CfAED), Dresden University of Technology , 01062 Dresden, Germany
| | - Gianaurelio Cuniberti
- Institute of Materials Science and Max Bergmann Center for Biomaterials, Center for Advancing Electronics Dresden (CfAED), Dresden University of Technology , 01062 Dresden, Germany
| | - Oliver G Schmidt
- Institute for Integrative Nanosciences, IFW Dresden , Helmholtzstraße 20, 01069 Dresden, Germany
- Material Systems for Nanoelectronics, Chemnitz University of Technology , Reichenhainer Straße 70, 09107 Chemnitz, Germany
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Abstract
As the future of health care diagnostics moves toward more portable and personalized techniques, there is immense potential to harness the power of electrical signals for biological sensing and diagnostic applications at the point of care. Electrical biochips can be used to both manipulate and sense biological entities, as they can have several inherent advantages, including on-chip sample preparation, label-free detection, reduced cost and complexity, decreased sample volumes, increased portability, and large-scale multiplexing. The advantages of fully integrated electrical biochip platforms are particularly attractive for point-of-care systems. This review summarizes these electrical lab-on-a-chip technologies and highlights opportunities to accelerate the transition from academic publications to commercial success.
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Affiliation(s)
- Bobby Reddy
- Department of Electrical and Computer Engineering,
- Micro and Nanotechnology Laboratory, University of Illinois at Urbana–Champaign, Urbana, Illinois 61801
| | - Eric Salm
- Department of Bioengineering, and
- Micro and Nanotechnology Laboratory, University of Illinois at Urbana–Champaign, Urbana, Illinois 61801
| | - Rashid Bashir
- Department of Electrical and Computer Engineering,
- Department of Bioengineering, and
- Micro and Nanotechnology Laboratory, University of Illinois at Urbana–Champaign, Urbana, Illinois 61801
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17
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Dak P, Ebrahimi A, Swaminathan V, Duarte-Guevara C, Bashir R, Alam MA. Droplet-based Biosensing for Lab-on-a-Chip, Open Microfluidics Platforms. BIOSENSORS 2016; 6:14. [PMID: 27089377 PMCID: PMC4931474 DOI: 10.3390/bios6020014] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 03/31/2016] [Accepted: 04/09/2016] [Indexed: 01/09/2023]
Abstract
Low cost, portable sensors can transform health care by bringing easily available diagnostic devices to low and middle income population, particularly in developing countries. Sample preparation, analyte handling and labeling are primary cost concerns for traditional lab-based diagnostic systems. Lab-on-a-chip (LoC) platforms based on droplet-based microfluidics promise to integrate and automate these complex and expensive laboratory procedures onto a single chip; the cost will be further reduced if label-free biosensors could be integrated onto the LoC platforms. Here, we review some recent developments of label-free, droplet-based biosensors, compatible with "open" digital microfluidic systems. These low-cost droplet-based biosensors overcome some of the fundamental limitations of the classical sensors, enabling timely diagnosis. We identify the key challenges that must be addressed to make these sensors commercially viable and summarize a number of promising research directions.
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Affiliation(s)
- Piyush Dak
- Purdue University, West Lafayette 47906, IN, USA.
| | | | | | | | - Rashid Bashir
- University of Illinois at Urbana-Champaign, Urbana 61801, IL, USA.
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An incremental double-layer capacitance of a planar nano gap and its application in cardiac-troponin T detection. Biosens Bioelectron 2015; 79:636-43. [PMID: 26761619 DOI: 10.1016/j.bios.2015.12.105] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 12/24/2015] [Accepted: 12/29/2015] [Indexed: 11/20/2022]
Abstract
Surface potential is one of the most important properties at solid-liquid interfaces. It can be modulated by the voltage applied on the electrode or by the surface properties. Hence, surface potential is a good indicator for surface modifications, such as biomolecular bindings. In this work, we proposed a planar nano-gap structure for surface-potential difference monitoring. Based on the proposed architecture, the variance of surface-potential difference can be determined by electrical double layer capacitance (EDLC) between the nano-gap electrodes. Using cyclic voltammetry method, in this work, we demonstrated a relationship between surface potential and EDLC by chemically modifying surface properties. Finally, we also showed the proposed planar nano-gap device provides the capability for cardiac-troponin T (cTnT) measurements with co-existed 10 µg/ml BSA interference. The detection dynamic range is from 100 pg/ml to 1 µg/ml. Based on experimental results and extrapolation, the detection limit is less than 100 pg/ml in diluted PBS buffer (0.01X PBS). These results demonstrated the planar nano-gap architecture having potentials on biomolecular detection through monitoring of surface-potential variation.
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19
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Amouzadeh Tabrizi M, Shamsipur M. A label-free electrochemical DNA biosensor based on covalent immobilization of salmonella DNA sequences on the nanoporous glassy carbon electrode. Biosens Bioelectron 2015; 69:100-5. [DOI: 10.1016/j.bios.2015.02.024] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 02/12/2015] [Accepted: 02/13/2015] [Indexed: 02/08/2023]
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20
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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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Brosel-Oliu S, Abramova N, Bratov A, Vigués N, Mas J, Muñoz FX. Sensitivity and Response Time of Polyethyleneimine Modified Impedimetric Transducer for Bacteria Detection. ELECTROANAL 2015. [DOI: 10.1002/elan.201400575] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Adley CC. Past, Present and Future of Sensors in Food Production. Foods 2014; 3:491-510. [PMID: 28234333 PMCID: PMC5302250 DOI: 10.3390/foods3030491] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Revised: 07/18/2014] [Accepted: 07/21/2014] [Indexed: 12/16/2022] Open
Abstract
Microbial contamination management is a crucial task in the food industry. Undesirable microbial spoilage in a modern food processing plant poses a risk to consumers' health, causing severe economic losses to the manufacturers and retailers, contributing to wastage of food and a concern to the world's food supply. The main goal of the quality management is to reduce the time interval between the filling and the detection of a microorganism before release, from several days, to minutes or, at most, hours. This would allow the food company to stop the production, limiting the damage to just a part of the entire batch, with considerable savings in terms of product value, thereby avoiding the utilization of raw materials, packaging and strongly reducing food waste. Sensor systems offer major advantages over current systems as they are versatile and affordable but need to be integrated in the existing processing systems as a process analytical control (PAT) tool. The desire for good selectivity, low cost, portable and usable at working sites, sufficiently rapid to be used at-line or on-line, and no sample preparation devices are required. The application of biosensors in the food industry still has to compete with the standard analytical techniques in terms of cost, performance and reliability.
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Affiliation(s)
- Catherine C Adley
- Microbiology Laboratory, Department of Chemical and Environmental Sciences, University of Limerick, Limerick, Ireland.
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Ebrahimi A, Dak P, Salm E, Dash S, Garimella SV, Bashir R, Alam MA. Nanotextured superhydrophobic electrodes enable detection of attomolar-scale DNA concentration within a droplet by non-faradaic impedance spectroscopy. LAB ON A CHIP 2013; 13:4248-4256. [PMID: 24056864 PMCID: PMC3886286 DOI: 10.1039/c3lc50517k] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Label-free, rapid detection of biomolecules in microliter volumes of highly diluted solutions (sub-femtomolar) is of essential importance for numerous applications in medical diagnostics, food safety, and chem-bio sensing for homeland security. At ultra-low concentrations, regardless of the sensitivity of the detection approach, the sensor response time is limited by physical diffusion of molecules towards the sensor surface. We have developed a fast, low cost, non-faradaic impedance sensing method for detection of synthetic DNA molecules in DI water at attomolar levels by beating the diffusion limit through evaporation of a micro-liter droplet of DNA on a nanotextured superhydrophobic electrode array. Continuous monitoring of the impedance of individual droplets as a function of evaporation time is exploited to dramatically improve the sensitivity and robustness of detection. Formation of the nanostructures on the electrode surface not only increases the surface hydrophobicity, but also allows robust pinning of the droplet contact area to the sensor surface. These two features are critical for performing highly stable impedance measurements as the droplet evaporates. Using this scheme, the detection limit of conventional non-faradaic methods is improved by five orders of magnitude. The proposed platform represents a step-forward towards realization of ultra-sensitive lab-on-chip biomolecule detectors for real time point-of-care application. Further works are however needed to ultimately realize the full potential of the proposed approach to appraise biological samples in complex buffer solutions rather than in DI water.
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Affiliation(s)
- Aida Ebrahimi
- School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN 47907, USA.
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Negri P, Dluhy RA. Detection of genetic markers related to high pathogenicity in influenza by SERS. Analyst 2013; 138:4877-84. [PMID: 23833767 PMCID: PMC3767290 DOI: 10.1039/c3an00774j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We have developed a method for the detection of genetic markers associated with high pathogenicity in influenza. The assay consists of an array of 5'-thiolated ssDNA oligonucleotides immobilized on the surface of a Ag nanorod substrate that serve as capture probes for the detection of synthetic RNA sequences coding for a genetic mutation in the influenza PB1-F2 protein. Hybridization of the DNA probes to their complementary RNA sequences was detected using surface-enhanced Raman spectroscopy (SERS). Multivariate statistical analysis was used to differentiate the spectra of the complementary DNA probe-RNA target hybrids from those of the non-complementary DNA probes containing a single base pair polymorphism. Hierarchical cluster analysis (HCA) was able to distinguish with 100% accuracy the spectra of the complementary DNA probe-RNA target from the spectra of the immobilized DNA probes alone, or the DNA probes incubated with non-complementary RNA sequences. Linearity of response and limits of sensitivity of the SERS-based assays were determined using a partial least squares (PLS) regression model; detection limits computed by PLS was determined to be ~10 nM. The binding affinity of the DNA probes to their complementary RNA sequences was confirmed using enzyme-linked immunosorbent assay (ELISA); however, the detection limits observed using ELISA were approximately 10× higher (~100 nM) than those determined by PLS analysis of the SERS spectra.
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Affiliation(s)
- Pierre Negri
- Department of Chemistry, University of Georgia, Athens, GA 30602
| | - Richard A. Dluhy
- Department of Chemistry, University of Georgia, Athens, GA 30602
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Ahadian S, Ramón-Azcón J, Ostrovidov S, Camci-Unal G, Kaji H, Ino K, Shiku H, Khademhosseini A, Matsue T. A contactless electrical stimulator: application to fabricate functional skeletal muscle tissue. Biomed Microdevices 2013; 15:109-15. [PMID: 22965808 DOI: 10.1007/s10544-012-9692-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Engineered skeletal muscle tissues are ideal candidates for applications in drug screening systems, bio-actuators, and as implantable constructs in tissue engineering. Electrical field stimulation considerably improves the differentiation of muscle cells to muscle myofibers. Currently used electrical stimulators often use direct contact of electrodes with tissue constructs or their culture medium, which may cause hydrolysis of the culture medium, joule heating of the medium, contamination of the culture medium due to products of electrodes corrosion, and surface fouling of electrodes. Here, we used an interdigitated array of electrodes combined with an isolator coverslip as a contactless platform to electrically stimulate engineered muscle tissue, which eliminates the aforementioned problems. The effective stimulation of muscle myofibers using this device was demonstrated in terms of contractile activity and higher maturation as compared to muscle tissues without applying the electrical field. Due to the wide array of potential applications of electrical stimulation to two- and three-dimensional (2D and 3D) cell and tissue constructs, this device could be of great interest for a variety of biological applications as a tool to create noninvasive, safe, and highly reproducible electric fields.
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Affiliation(s)
- Samad Ahadian
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai, 980-8577, Japan
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27
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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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Ahadian S, Ramón-Azcón J, Ostrovidov S, Camci-Unal G, Hosseini V, Kaji H, Ino K, Shiku H, Khademhosseini A, Matsue T. Interdigitated array of Pt electrodes for electrical stimulation and engineering of aligned muscle tissue. LAB ON A CHIP 2012; 12:3491-503. [PMID: 22847280 DOI: 10.1039/c2lc40479f] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Engineered skeletal muscle tissues could be useful for applications in tissue engineering, drug screening, and bio-robotics. It is well-known that skeletal muscle cells are able to differentiate under electrical stimulation (ES), with an increase in myosin production, along with the formation of myofibers and contractile proteins. In this study, we describe the use of an interdigitated array of electrodes as a novel platform to electrically stimulate engineered muscle tissues. The resulting muscle myofibers were analyzed and quantified in terms of their myotube characteristics and gene expression. The engineered muscle tissues stimulated through the interdigitated array of electrodes demonstrated superior performance and maturation compared to the corresponding tissues stimulated through a conventional setup (i.e., through Pt wires in close proximity to the muscle tissue). In particular, the ES of muscle tissue (voltage 6 V, frequency 1 Hz and duration 10 ms for 1 day) through the interdigitated array of electrodes resulted in a higher degree of C2C12 myotube alignment (∼80%) as compared to ES using Pt wires (∼65%). In addition, higher amounts of C2C12 myotube coverage area, myotube length, muscle transcription factors and protein biomarkers were found for myotubes stimulated through the interdigitated array of electrodes compared to those stimulated using the Pt wires. Due to the wide array of potential applications of ES for two- and three-dimensional (2D and 3D) engineered tissues, the suggested platform could be employed for a variety of cell and tissue structures to more efficiently investigate their response to electrical fields.
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Affiliation(s)
- Samad Ahadian
- WPI-Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
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Foudeh AM, Fatanat Didar T, Veres T, Tabrizian M. Microfluidic designs and techniques using lab-on-a-chip devices for pathogen detection for point-of-care diagnostics. LAB ON A CHIP 2012; 12:3249-66. [PMID: 22859057 DOI: 10.1039/c2lc40630f] [Citation(s) in RCA: 267] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Effective pathogen detection is an essential prerequisite for the prevention and treatment of infectious diseases. Despite recent advances in biosensors, infectious diseases remain a major cause of illnesses and mortality throughout the world. For instance in developing countries, infectious diseases account for over half of the mortality rate. Pathogen detection platforms provide a fundamental tool in different fields including clinical diagnostics, pathology, drug discovery, clinical research, disease outbreaks, and food safety. Microfluidic lab-on-a-chip (LOC) devices offer many advantages for pathogen detection such as miniaturization, small sample volume, portability, rapid detection time and point-of-care diagnosis. This review paper outlines recent microfluidic based devices and LOC design strategies for pathogen detection with the main focus on the integration of different techniques that led to the development of sample-to-result devices. Several examples of recently developed devices are presented along with respective advantages and limitations of each design. Progresses made in biomarkers, sample preparation, amplification and fluid handling techniques using microfluidic platforms are also covered and strategies for multiplexing and high-throughput analysis, as well as point-of-care diagnosis, are discussed.
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Affiliation(s)
- Amir M Foudeh
- Biomedical Engineering Department, McGill University, Montreal, QC H3A 2B4, Canada
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Affiliation(s)
- Emil Paleček
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Kralovopolska 135, 612
65 Brno, Czech Republic
| | - Martin Bartošík
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Kralovopolska 135, 612
65 Brno, Czech Republic
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Bratov A, Abramova N, Marco MP, Sanchez-Baeza F. Three-Dimensional Interdigitated Electrode Array as a Tool for Surface Reactions Registration. ELECTROANAL 2011. [DOI: 10.1002/elan.201100392] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Juskova P, Foret F. Application of thin metal film elements in bioanalysis. J Sep Sci 2011; 34:2779-89. [DOI: 10.1002/jssc.201100288] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Revised: 03/31/2011] [Accepted: 05/19/2011] [Indexed: 11/10/2022]
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Tsouti V, Boutopoulos C, Zergioti I, Chatzandroulis S. Capacitive microsystems for biological sensing. Biosens Bioelectron 2011; 27:1-11. [PMID: 21752630 DOI: 10.1016/j.bios.2011.05.047] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2011] [Revised: 05/24/2011] [Accepted: 05/27/2011] [Indexed: 12/12/2022]
Abstract
The growing interest in personalized medicine leads to the need for fast, cheap and portable devices that reveal the genetic profile easily and accurately. To this direction, several ideas to avoid the classical methods of diagnosis and treatment through miniaturized and label-free systems have emerged. Capacitive biosensors address these requirements and thus have the perspective to be used in advanced diagnostic devices that promise early detection of potential fatal conditions. The operation principles, as well as the design and fabrication of several capacitive microsystems for the detection of biomolecular interactions are presented in this review. These systems are micro-membranes based on surface stress changes, interdigitated micro-electrodes and electrode-solution interfaces. Their applications extend to DNA hybridization, protein-ligand binding, antigen-antibody binding, etc. Finally, the limitations and prospects of capacitive microsystems in biological applications are discussed.
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Affiliation(s)
- V Tsouti
- Institute of Microelectronics, NCSR Demokritos, Terma Patriarchou Grigoriou, Agia Paraskevi 15310, Greece.
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Electrochemical detection of oligonucleotide by attaching redox probes onto its backbone. Biosens Bioelectron 2010; 26:2670-4. [PMID: 20400286 DOI: 10.1016/j.bios.2010.03.017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2010] [Revised: 02/26/2010] [Accepted: 03/13/2010] [Indexed: 11/23/2022]
Abstract
An approach was demonstrated to detect oligonucleotide by attaching redox probes onto its backbone. First, peptide nucleic acid (PNA) with a neutral backbone was immobilized onto a gold (Au) electrode surface as a capture. Second, when the PNA capture hybridized with a target oligonucleotide (a short DNA), an assembly of Au-PNA-DNA formed and phosphate groups were thus brought into the assembly from the DNA's backbone. The linker ion of Zr(4+) exhibits a strong coordination interaction with the phosphate group and the carboxylic group. The hybridized target DNA provides the phosphate group while a derivatized redox probe of ferrocene (Fc) carboxyl acid offers the carboxylic group. Therefore, the redox probe can be attached to the phosphate group by the linker to form an assembly of Au-PNA-DNA-Zr-Fc. Its redox process was studied and the detection conditions of oligonucleotide were optimized. A limit of detection of 1.0×10(-12) M or ∼2 attomol was reached.
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Liu Y, Sun Y, Sun K, Song L, Jiang X. Recent developments employing new materials for readout in lab-on-a-chip. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm00576b] [Citation(s) in RCA: 18] [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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Yang B, Kong J. Silicon-based Interdigitated Electrode Array for Highly Sensitive Heavy Metal Ion Sensing. CHEM LETT 2009. [DOI: 10.1246/cl.2009.1072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Mir M, Homs A, Samitier J. Integrated electrochemical DNA biosensors for lab-on-a-chip devices. Electrophoresis 2009; 30:3386-97. [DOI: 10.1002/elps.200900319] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Qi Y, Li B, Zhang Z. Label-free and homogeneous DNA hybridization detection using gold nanoparticles-based chemiluiminescence system. Biosens Bioelectron 2009; 24:3581-6. [DOI: 10.1016/j.bios.2009.05.021] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2009] [Revised: 05/14/2009] [Accepted: 05/19/2009] [Indexed: 11/26/2022]
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Fabrication of the nanogapped gold nanoparticles film for direct electrical detection of DNA and EcoRI endonuclease. Colloids Surf B Biointerfaces 2009; 69:99-104. [DOI: 10.1016/j.colsurfb.2008.11.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2008] [Revised: 11/14/2008] [Accepted: 11/14/2008] [Indexed: 11/22/2022]
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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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Characterisation of the interdigitated electrode array with tantalum silicide electrodes separated by insulating barriers. Electrochem commun 2008. [DOI: 10.1016/j.elecom.2008.07.037] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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