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Paradowska E, Studzińska M, Jabłońska A, Lozovski V, Rusinchuk N, Mukha I, Vitiuk N, Leśnikowski ZJ. Antiviral Effect of Nonfunctionalized Gold Nanoparticles against Herpes Simplex Virus Type-1 (HSV-1) and Possible Contribution of Near-Field Interaction Mechanism. Molecules 2021; 26:molecules26195960. [PMID: 34641506 PMCID: PMC8512028 DOI: 10.3390/molecules26195960] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Revised: 09/27/2021] [Accepted: 09/28/2021] [Indexed: 11/16/2022] Open
Abstract
The antiviral activity of nonfunctionalized gold nanoparticles (AuNPs) against herpes simplex virus type-1 (HSV-1) in vitro was revealed in this study. We found that AuNPs are capable of reducing the cytopathic effect (CPE) of HSV-1 in Vero cells in a dose- and time-dependent manner when used in pretreatment mode. The demonstrated antiviral activity was within the nontoxic concentration range of AuNPs. Interestingly, we noted that nanoparticles with smaller sizes reduced the CPE of HSV-1 more effectively than larger ones. The observed phenomenon can be tentatively explained by the near-field action of nanoparticles at the virus envelope. These results show that AuNPs can be considered as potential candidates for the treatment of HSV-1 infections.
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Affiliation(s)
- Edyta Paradowska
- Institute of Medical Biology, Polish Academy of Sciences, 106 Lodowa St., 93-232 Łódź, Poland; (E.P.); (M.S.); (A.J.)
| | - Mirosława Studzińska
- Institute of Medical Biology, Polish Academy of Sciences, 106 Lodowa St., 93-232 Łódź, Poland; (E.P.); (M.S.); (A.J.)
| | - Agnieszka Jabłońska
- Institute of Medical Biology, Polish Academy of Sciences, 106 Lodowa St., 93-232 Łódź, Poland; (E.P.); (M.S.); (A.J.)
| | - Valeri Lozovski
- Institute of High Technologies, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska St., 01033 Kyiv, Ukraine;
- Correspondence: (V.L.); (Z.J.L.)
| | - Natalia Rusinchuk
- Institute of High Technologies, Taras Shevchenko National University of Kyiv, 64/13 Volodymyrska St., 01033 Kyiv, Ukraine;
| | - Iuliia Mukha
- Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov St., 03164 Kyiv, Ukraine; (I.M.); (N.V.)
| | - Nadiia Vitiuk
- Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov St., 03164 Kyiv, Ukraine; (I.M.); (N.V.)
| | - Zbigniew J. Leśnikowski
- Institute of Medical Biology, Polish Academy of Sciences, 106 Lodowa St., 93-232 Łódź, Poland; (E.P.); (M.S.); (A.J.)
- Correspondence: (V.L.); (Z.J.L.)
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2
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Hayes MA. Dielectrophoresis of proteins: experimental data and evolving theory. Anal Bioanal Chem 2020; 412:3801-3811. [PMID: 32314000 PMCID: PMC7250158 DOI: 10.1007/s00216-020-02623-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 02/28/2020] [Accepted: 03/27/2020] [Indexed: 02/07/2023]
Abstract
The ability to selectively move and trap proteins is core to their effective use as building blocks and for their characterization. Analytical and preparative strategies for proteins have been pursued and modeled for nearly a hundred years, with great advances and success. Core to all of these studies is the separation, isolation, purification, and concentration of pure homogeneous fractions of a specific protein in solution. Processes to accomplish this useful solution include biphasic equilibrium (chromatographies, extractions), mechanical, bulk property, chemical equilibria, and molecular recognition. Ultimately, the goal of all of these is to physically remove all non-like protein molecules-to the finest detail: all atoms in the full three-dimensional structure being identical down the chemical bond and bulk structure chirality. One strategy which has not been effectively pursued is exploiting the higher order subtle electrical properties of the protein-solvent system. The advent of microfluidic systems has enabled the use of very high electric fields and well-defined gradients such that extremely high resolution separations of protein mixtures are possible. These advances and recognition of these capabilities have caused a re-evaluation of the underlying theoretical models and they were found to be inadequate. New theoretical descriptions are being considered which align more closely to the total forces present and the subtlety of differences between similar proteins. These are focused on the interfacial area between the protein and hydrating solvent molecules, as opposed to the macroscale assumptions of homogeneous solutions and particles. This critical review examines all data which has been published that place proteins in electric field gradients which induce collection of those proteins, demonstrating a force greater than dispersive effects or countering forces. Evolving theoretical constructs are presented and discussed, and a general estimate of future capabilities using the higher order effects and the high fields and precise gradients of microfluidic systems is discussed. Graphical abstract.
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Affiliation(s)
- Mark A Hayes
- School of Molecular Sciences, Arizona State University, Mail Stop 1604, Tempe, AZ, 85287, USA.
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3
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Pethig R. Limitations of the Clausius-Mossotti function used in dielectrophoresis and electrical impedance studies of biomacromolecules. Electrophoresis 2019; 40:2575-2583. [PMID: 30861572 DOI: 10.1002/elps.201900057] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 02/26/2019] [Accepted: 02/26/2019] [Indexed: 01/08/2023]
Abstract
Dielectrophoresis (DEP) studies have progressed from the microscopic scale of cells and bacteria, through the mesoscale of virions to the molecular scale of DNA and proteins. The Clausius-Mossotti function, based on macroscopic electrostatics, is invariably employed in the analyses of all these studies. The limitations of this practice are explored, with the conclusion that it should be abandoned for the DEP study of proteins and modified for native DNA. For macromolecular samples in general, a DEP theory that incorporates molecular-scale interactions and the influence of permanent dipoles is more appropriate. Experimental ways to test these conclusions are proposed.
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Affiliation(s)
- Ronald Pethig
- School of Engineering, Institute for Integrated Micro and Nanosystems, University of Edinburgh, Edinburgh, UK
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4
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Affiliation(s)
- Daihyun Kim
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
- Center for Applied Structural Discovery, The Biodesign Institute, Arizona State University, Tempe, Arizona 85287, United States
| | - Mukul Sonker
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
- Center for Applied Structural Discovery, The Biodesign Institute, Arizona State University, Tempe, Arizona 85287, United States
| | - Alexandra Ros
- School of Molecular Sciences, Arizona State University, Tempe, Arizona 85287, United States
- Center for Applied Structural Discovery, The Biodesign Institute, Arizona State University, Tempe, Arizona 85287, United States
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5
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Transverse dielectrophoretic-based DNA nanoscale confinement. Sci Rep 2018; 8:5981. [PMID: 29654238 PMCID: PMC5899125 DOI: 10.1038/s41598-018-24132-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 03/26/2018] [Indexed: 11/19/2022] Open
Abstract
Confinement of single molecules within nanoscale environments is crucial in a range of fields, including biomedicine, genomics, and biophysics. Here, we present a method that can concentrate, confine, and linearly stretch DNA molecules within a single optical field of view using dielectrophoretic (DEP) force. The method can convert an open surface into one confining DNA molecules without a requirement for bonding, hydrodynamic or mechanical components. We use a transverse DEP field between a top coverslip and a bottom substrate, both of which are coated with a transparent conductive material. Both layers are attached using double-sided tape, defining the chamber. The nanofeatures lie at the “floor” and do not require any bonding. With the application of an alternating (AC) electric field (2 Vp-p) between the top and bottom electrodes, a DEP field gradient is established and used to concentrate, confine and linearly extend DNA in nanogrooves as small as 100-nm in width. We also demonstrate reversible loading/unloading of DNA molecules into nanogrooves and nanopits by switching frequency (between 10 kHz to 100 kHz). The technology presented in this paper provides a new method for single-molecule trapping and analysis.
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6
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Kale A, Song L, Lu X, Yu L, Hu G, Xuan X. Electrothermal enrichment of submicron particles in an insulator-based dielectrophoretic microdevice. Electrophoresis 2017; 39:887-896. [DOI: 10.1002/elps.201700342] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 09/25/2017] [Accepted: 10/13/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Akshay Kale
- Department of Mechanical Engineering; Clemson University; Clemson USA
| | - Le Song
- School of Instrument Science and Opto-electronic Engineering; Hefei University of Technology; Hefei P. R. China
| | - Xinyu Lu
- Department of Mechanical Engineering; Clemson University; Clemson USA
| | - Liandong Yu
- School of Instrument Science and Opto-electronic Engineering; Hefei University of Technology; Hefei P. R. China
| | - Guoqing Hu
- LNM; Institute of Mechanics; Chinese Academy of Sciences; Beijing P. R. China
- School of Engineering Science; University of Chinese Academy of Sciences; Beijing P. R. China
| | - Xiangchun Xuan
- Department of Mechanical Engineering; Clemson University; Clemson USA
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7
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Viefhues M, Eichhorn R. DNA dielectrophoresis: Theory and applications a review. Electrophoresis 2017; 38:1483-1506. [PMID: 28306161 DOI: 10.1002/elps.201600482] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 03/07/2017] [Accepted: 03/08/2017] [Indexed: 01/24/2023]
Abstract
Dielectrophoresis is the migration of an electrically polarizable particle in an inhomogeneous electric field. This migration can be exploited for several applications with (bio)molecules or cells. Dielectrophoresis is a noninvasive technique; therefore, it is very convenient for (selective) manipulation of (bio)molecules or cells. In this review, we will focus on DNA dielectrophoresis as this technique offers several advantages in trapping and immobilization, separation and purification, and analysis of DNA molecules. We present and discuss the underlying theory of the most important forces that have to be considered for applications with dielectrophoresis. Moreover, a review of DNA dielectrophoresis applications is provided to present the state-of-the-art and to offer the reader a perspective of the advances and current limitations of DNA dielectrophoresis.
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Affiliation(s)
- Martina Viefhues
- Experimental Biophysics and Applied Nanoscience, Faculty of Physics, Bielefeld University, Bielefeld, Germany
| | - Ralf Eichhorn
- Nordita, Royal Institute of Technology and Stockholm University, Stockholm, Sweden
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8
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Koklu A, Sabuncu AC, Beskok A. Enhancement of dielectrophoresis using fractal gold nanostructured electrodes. Electrophoresis 2017; 38:1458-1465. [PMID: 28130914 DOI: 10.1002/elps.201600456] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Revised: 12/30/2016] [Accepted: 01/22/2017] [Indexed: 11/07/2022]
Abstract
Dielectrophoretic motions of Saccharomyces cerevisiae (yeast) cells and colloidal gold are investigated using electrochemically modified electrodes exhibiting fractal topology. Electrodeposition of gold on electrodes generated repeated patterns with a fern-leaf type self-similarity. A particle tracking algorithm is used to extract dielectrophoretic particle velocities using fractal and planar electrodes in two different medium conductivities. The results show increased dielectrophoretic force when using fractal electrodes. Strong negative dielectrophoresis of yeast cells in high-conductivity media (1.5 S/m) is observed using fractal electrodes, while no significant motion is present using planar electrodes. Electrical impedance at the electrode/electrolyte interface is measured using impedance spectroscopy technique. Stronger electrode polarization (EP) effects are reported for planar electrodes. Decreased EP in fractal electrodes is considered as a reason for enhanced dielectrophoretic response.
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Affiliation(s)
- Anil Koklu
- Department of Mechanical Engineering, Southern Methodist University, Dallas, TX, USA
| | - Ahmet C Sabuncu
- Department of Mechanical Engineering, Southern Methodist University, Dallas, TX, USA
| | - Ali Beskok
- Department of Mechanical Engineering, Southern Methodist University, Dallas, TX, USA
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9
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Jones PV, Salmon GL, Ros A. Continuous Separation of DNA Molecules by Size Using Insulator-Based Dielectrophoresis. Anal Chem 2017; 89:1531-1539. [DOI: 10.1021/acs.analchem.6b03369] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Paul V. Jones
- School of Molecular
Sciences, Arizona State University, P.O. Box 871604, Tempe, Arizona 85287, United States
- Center
for Applied Structural
Discovery, The Biodesign Institute, Tempe, Arizona 85281, United States
| | - Gabriel L. Salmon
- School of Molecular
Sciences, Arizona State University, P.O. Box 871604, Tempe, Arizona 85287, United States
- Center
for Applied Structural
Discovery, The Biodesign Institute, Tempe, Arizona 85281, United States
| | - Alexandra Ros
- School of Molecular
Sciences, Arizona State University, P.O. Box 871604, Tempe, Arizona 85287, United States
- Center
for Applied Structural
Discovery, The Biodesign Institute, Tempe, Arizona 85281, United States
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10
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Bazaka K, Jacob MV, Ostrikov KK. Sustainable Life Cycles of Natural-Precursor-Derived Nanocarbons. Chem Rev 2015; 116:163-214. [PMID: 26717047 DOI: 10.1021/acs.chemrev.5b00566] [Citation(s) in RCA: 144] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Sustainable societal and economic development relies on novel nanotechnologies that offer maximum efficiency at minimal environmental cost. Yet, it is very challenging to apply green chemistry approaches across the entire life cycle of nanotech products, from design and nanomaterial synthesis to utilization and disposal. Recently, novel, efficient methods based on nonequilibrium reactive plasma chemistries that minimize the process steps and dramatically reduce the use of expensive and hazardous reagents have been applied to low-cost natural and waste sources to produce value-added nanomaterials with a wide range of applications. This review discusses the distinctive effects of nonequilibrium reactive chemistries and how these effects can aid and advance the integration of sustainable chemistry into each stage of nanotech product life. Examples of the use of enabling plasma-based technologies in sustainable production and degradation of nanotech products are discussed-from selection of precursors derived from natural resources and their conversion into functional building units, to methods for green synthesis of useful naturally degradable carbon-based nanomaterials, to device operation and eventual disintegration into naturally degradable yet potentially reusable byproducts.
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Affiliation(s)
- Kateryna Bazaka
- Institute for Future Environments, School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology , Brisbane, Queensland 4000, Australia.,Electronics Materials Lab, College of Science, Technology and Engineering, James Cook University , Townsville, Queensland 4811, Australia.,CSIRO-QUT Joint Sustainable Materials and Devices Laboratory, Commonwealth Scientific and Industrial Research Organization , P.O. Box 218, Lindfield, New South Wales 2070, Australia
| | - Mohan V Jacob
- Electronics Materials Lab, College of Science, Technology and Engineering, James Cook University , Townsville, Queensland 4811, Australia
| | - Kostya Ken Ostrikov
- Institute for Future Environments, School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology , Brisbane, Queensland 4000, Australia.,CSIRO-QUT Joint Sustainable Materials and Devices Laboratory, Commonwealth Scientific and Industrial Research Organization , P.O. Box 218, Lindfield, New South Wales 2070, Australia.,School of Physics, The University of Sydney , Sydney, New South Wales 2006, Australia
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11
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Brown E, Zhang WD, Viveros L, Neff D, Green N, Norton M, Pham P, Burke P. Sensing of DNA by graphene-on-silicon FET structures at DC and 101 GHz. SENSING AND BIO-SENSING RESEARCH 2015. [DOI: 10.1016/j.sbsr.2015.05.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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12
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Yang C, Wu CJ, Ostafin AE, Thibaudeau G, Minerick AR. Size and medium conductivity dependence on dielectrophoretic behaviors of gas core poly-L-lysine shell nanoparticles. Electrophoresis 2015; 36:1002-10. [PMID: 25640705 DOI: 10.1002/elps.201400315] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Revised: 12/28/2014] [Accepted: 01/07/2015] [Indexed: 12/11/2022]
Abstract
Dynamic (dis)assembly of biocompatible nanoparticles into 3D, packed structures would benefit drug delivery, films, and diagnostics. Dielectrophoretic (DEP) microdevices can rapidly assemble and manipulate polarizable particles within nonuniform electric fields. DEP has primarily discerned micrometer particles since nanoparticles experience smaller forces. This work examines conductivity and size DEP dependencies of previously unexplored spherical core-shell nanoparticle (CSnp) into 3D particle assemblies. Poly-L-lysine shell material was custom synthesized around a gas core to form CSnps. DEP frequencies from 1 kHz to 80 MHz at fixed 5 volts peak-to-peak and medium conductivities of 10(-5) and 10(-3) S/m were tested. DEP responses of ∼220 and ∼400 nm poly-L-lysine CSnps were quantified via video intensity densitometry at the microdevice's quadrapole electrode center for negative DEP (nDEP) and adjacent to electrodes for positive DEP. Intensity densitometry was then translated into a relative DEP response curve. An unusual nDEP peak occurred at ∼57 MHz with 25-80 times greater apparent nDEP force. All electrical circuit components were then impedance matched, which changed the observed response to weak positive DEP at low frequencies and consistently weak nDEP from ∼100 kHz to 80 MHz. This impedance-matched behavior agrees with conventional Clausius-Mossotti DEP signatures taking into account the gas core's contributions to the polarization mechanisms. This work describes a potential pitfall when conducting DEP at higher frequencies in microdevices and concurrently demonstrates nDEP behavior for a chemically and structurally distinct particle system. This work provides insight into organic shell material properties in nanostructures and strategies to facilitate dynamic nanoparticle assemblies.
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Affiliation(s)
- Chungja Yang
- Chemical Engineering Department, Michigan Technological University, Houghton, MI, USA
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13
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White SP, Dorfman KD, Frisbie CD. Label-free DNA sensing platform with low-voltage electrolyte-gated transistors. Anal Chem 2015; 87:1861-6. [PMID: 25569583 DOI: 10.1021/ac503914x] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report a method to measure DNA hybridization potentiometrically in a manner conducive to portable or hand-held biosensors. An electrolyte-gated transistor (EGT) based on poly(3-hexylthiophene) (P3HT) and an ion-gel serves as a transducer for surface hybridization of DNA. The key aspect of the design is the use of a floating-gate electrode functionalized with ssDNA whose potential is determined by both capacitive coupling with a primary, addressable gate electrode and the presence of adsorbed molecules. When DNA is hybridized at the floating gate, it offsets the primary gate voltage felt by the P3HT semiconductor; the offset is directly measurable and quantitatively related to the number density of dsDNA molecules. The presented sensing strategy can be readily adapted to other biomolecules of interest and integrated into a microfluidic system for field applications of biosensors.
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Affiliation(s)
- Scott P White
- Department of Chemical Engineering and Materials Science, University of Minnesota , Minneapolis, Minnesota 55455, United States
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14
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Shen B, Linko V, Dietz H, Toppari JJ. Dielectrophoretic trapping of multilayer DNA origami nanostructures and DNA origami-induced local destruction of silicon dioxide. Electrophoresis 2014; 36:255-62. [DOI: 10.1002/elps.201400323] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 08/14/2014] [Accepted: 08/25/2014] [Indexed: 11/07/2022]
Affiliation(s)
- Boxuan Shen
- Department of Physics; Nanoscience Center; University of Jyväskylä; Jyväskylä Finland
| | - Veikko Linko
- Physik Department; Walter Schottky Institute; Technische Universität München; Garching Germany
- Biohybrid Materials, Department of Biotechnology and Chemical Technology; Aalto University; Aalto Espoo Finland
- Molecular Materials, Department of Applied Physics; Aalto University; Aalto Espoo Finland
| | - Hendrik Dietz
- Physik Department; Walter Schottky Institute; Technische Universität München; Garching Germany
| | - J. Jussi Toppari
- Department of Physics; Nanoscience Center; University of Jyväskylä; Jyväskylä Finland
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15
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Abstract
The electric polarizability of DNA, represented by the dielectric constant, is a key intrinsic property that modulates DNA interaction with effector proteins. Surprisingly, it has so far remained unknown owing to the lack of experimental tools able to access it. Here, we experimentally resolved it by detecting the ultraweak polarization forces of DNA inside single T7 bacteriophages particles using electrostatic force microscopy. In contrast to the common assumption of low-polarizable behavior like proteins (εr ∼ 2-4), we found that the DNA dielectric constant is ∼ 8, considerably higher than the value of ∼ 3 found for capsid proteins. State-of-the-art molecular dynamic simulations confirm the experimental findings, which result in sensibly decreased DNA interaction free energy than normally predicted by Poisson-Boltzmann methods. Our findings reveal a property at the basis of DNA structure and functions that is needed for realistic theoretical descriptions, and illustrate the synergetic power of scanning probe microscopy and theoretical computation techniques.
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16
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Otto S, Kaletta U, Bier FF, Wenger C, Hölzel R. Dielectrophoretic immobilisation of antibodies on microelectrode arrays. LAB ON A CHIP 2014; 14:998-1004. [PMID: 24441950 DOI: 10.1039/c3lc51190a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A silicon based chip device with a regular array of more than 100,000 cylindrical sub-microelectrodes has been developed for the dielectrophoretic (DEP) manipulation of nanoparticles and molecules in solution. It was fabricated by a standard CMOS (complementary metal oxide semiconductor) compatible process. The distribution of the electrical field gradient was calculated to predict the applicability of the setup. Heating due to field application was determined microscopically using a temperature sensitive fluorescent dye. Depending on voltage and frequency, temperature increase was found to be compatible with protein function. Successful field controlled immobilisation of biomolecules from solution was demonstrated with the autofluorescent protein R-phycoerythrin (RPE) and with fluorescently labelled IgG antibodies. Biological activity after DEP application was proven by immobilisation of an anti-RPE antibody and subsequent binding of RPE. These results demonstrate that the developed chip system allows the directed immobilisation of proteins onto microelectrodes by dielectrophoresis without the need for any chemical modification and that protein function is preserved. Being based on standard lithographical methods, further miniaturisation and on-chip integration of electronics towards a multiparameter single cell analysis system appear near at hand.
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Affiliation(s)
- Saskia Otto
- Fraunhofer Institute for Biomedical Engineering (IBMT), Branch Potsdam-Golm, 14476 Potsdam, Germany.
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17
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Havelka D, Kučera O, Deriu MA, Cifra M. Electro-acoustic behavior of the mitotic spindle: a semi-classical coarse-grained model. PLoS One 2014; 9:e86501. [PMID: 24497952 PMCID: PMC3907432 DOI: 10.1371/journal.pone.0086501] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2013] [Accepted: 12/09/2013] [Indexed: 12/25/2022] Open
Abstract
The regulation of chromosome separation during mitosis is not fully understood yet. Microtubules forming mitotic spindles are targets of treatment strategies which are aimed at (i) the triggering of the apoptosis or (ii) the interruption of uncontrolled cell division. Despite these facts, only few physical models relating to the dynamics of mitotic spindles exist up to now. In this paper, we present the first electromechanical model which enables calculation of the electromagnetic field coupled to acoustic vibrations of the mitotic spindle. This electromagnetic field originates from the electrical polarity of microtubules which form the mitotic spindle. The model is based on the approximation of resonantly vibrating microtubules by a network of oscillating electric dipoles. Our computational results predict the existence of a rapidly changing electric field which is generated by either driven or endogenous vibrations of the mitotic spindle. For certain values of parameters, the intensity of the electric field and its gradient reach values which may exert a not-inconsiderable force on chromosomes which are aligned in the spindle midzone. Our model may describe possible mechanisms of the effects of ultra-short electrical and mechanical pulses on dividing cells--a strategy used in novel methods for cancer treatment.
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Affiliation(s)
- Daniel Havelka
- Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic, Prague, Czechia
- Department of Electromagnetic Field, Faculty of Electrical Engineering, Czech Technical University in Prague, Prague, Czechia
- * E-mail:
| | - Ondřej Kučera
- Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic, Prague, Czechia
| | - Marco A. Deriu
- Institute of Computer Integrated Manufacturing for Sustainable Innovation, Department of Innovative Technologies, University of Applied Sciences and Arts of Southern Switzerland (SUPSI), Manno, Switzerland
| | - Michal Cifra
- Institute of Photonics and Electronics, Academy of Sciences of the Czech Republic, Prague, Czechia
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18
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Ermilova E, Bier FF, Hölzel R. Dielectric measurements of aqueous DNA solutions up to 110 GHz. Phys Chem Chem Phys 2014; 16:11256-64. [DOI: 10.1039/c3cp55272a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Gan L, Chao TC, Camacho-Alanis F, Ros A. Six-Helix Bundle and Triangle DNA Origami Insulator-Based Dielectrophoresis. Anal Chem 2013; 85:11427-34. [DOI: 10.1021/ac402493u] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Lin Gan
- Department of Chemistry and
Biochemistry, Arizona State University, Tempe, AZ 85287, U.S.A
| | - Tzu-Chiao Chao
- Department of Chemistry and
Biochemistry, Arizona State University, Tempe, AZ 85287, U.S.A
| | | | - Alexandra Ros
- Department of Chemistry and
Biochemistry, Arizona State University, Tempe, AZ 85287, U.S.A
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20
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Martinez-Duarte R, Camacho-Alanis F, Renaud P, Ros A. Dielectrophoresis of lambda-DNA using 3D carbon electrodes. Electrophoresis 2013; 34:1113-22. [PMID: 23348619 DOI: 10.1002/elps.201200447] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 11/22/2012] [Accepted: 12/10/2012] [Indexed: 11/12/2022]
Abstract
Carbon electrodes have recently been introduced as an alternative to metal electrodes and insulator structures for dielectrophoretic applications. Here, an experimental and theoretical study employing an array of 3D carbon electrodes contained in a microfluidic channel for the dielectrophoretic manipulation of DNA is presented. First evidence that carbon-electrode DEP can be used for the manipulation and trapping of biomolecules such as DNA is reported. In particular, the dielectrophoretic response of λ-DNA (48.5 kbp) under various frequencies and flow conditions necessary for retention of λ-DNA are studied. Negative DEP is observed at frequencies above 75 kHz and positive DEP is present in the range below 75 kHz and down to 5 kHz. We further implement a theoretical model to capture the experimental findings in sufficient detail. Our theoretical considerations based on reported scaling laws for linear and supercoiled DNA further suggest that carbon-electrode DEP devices could be employed in future analytical applications such as DNA preconcentration and fractionation.
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21
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Dorfman KD, King SB, Olson DW, Thomas JDP, Tree DR. Beyond gel electrophoresis: microfluidic separations, fluorescence burst analysis, and DNA stretching. Chem Rev 2013; 113:2584-667. [PMID: 23140825 PMCID: PMC3595390 DOI: 10.1021/cr3002142] [Citation(s) in RCA: 141] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Kevin D. Dorfman
- Department of Chemical Engineering and Materials Science, University of Minnesota — Twin Cities, 421 Washington Ave. SE, Minneapolis, MN 55455, Phone: 1-612-624-5560. Fax: 1-612-626-7246
| | - Scott B. King
- Department of Chemical Engineering and Materials Science, University of Minnesota — Twin Cities, 421 Washington Ave. SE, Minneapolis, MN 55455, Phone: 1-612-624-5560. Fax: 1-612-626-7246
| | - Daniel W. Olson
- Department of Chemical Engineering and Materials Science, University of Minnesota — Twin Cities, 421 Washington Ave. SE, Minneapolis, MN 55455, Phone: 1-612-624-5560. Fax: 1-612-626-7246
| | - Joel D. P. Thomas
- Department of Chemical Engineering and Materials Science, University of Minnesota — Twin Cities, 421 Washington Ave. SE, Minneapolis, MN 55455, Phone: 1-612-624-5560. Fax: 1-612-626-7246
| | - Douglas R. Tree
- Department of Chemical Engineering and Materials Science, University of Minnesota — Twin Cities, 421 Washington Ave. SE, Minneapolis, MN 55455, Phone: 1-612-624-5560. Fax: 1-612-626-7246
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22
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Lopez-de la Fuente MS, Moncada-Hernandez H, Perez-Gonzalez VH, Lapizco-Encinas BH, Martinez-Chapa SO. An electric stimulation system for electrokinetic particle manipulation in microfluidic devices. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2013; 84:035103. [PMID: 23556848 DOI: 10.1063/1.4793559] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Microfluidic devices have grown significantly in the number of applications. Microfabrication techniques have evolved considerably; however, electric stimulation systems for microdevices have not advanced at the same pace. Electric stimulation of micro-fluidic devices is an important element in particle manipulation research. A flexible stimulation instrument is desired to perform configurable, repeatable, automated, and reliable experiments by allowing users to select the stimulation parameters. The instrument presented here is a configurable and programmable stimulation system for electrokinetic-driven microfluidic devices; it consists of a processor, a memory system, and a user interface to deliver several types of waveforms and stimulation patterns. It has been designed to be a flexible, highly configurable, low power instrument capable of delivering sine, triangle, and sawtooth waveforms with one single frequency or two superimposed frequencies ranging from 0.01 Hz to 40 kHz, and an output voltage of up to 30 Vpp. A specific stimulation pattern can be delivered over a single time period or as a sequence of different signals for different time periods. This stimulation system can be applied as a research tool where manipulation of particles suspended in liquid media is involved, such as biology, medicine, environment, embryology, and genetics. This system has the potential to lead to new schemes for laboratory procedures by allowing application specific and user defined electric stimulation. The development of this device is a step towards portable and programmable instrumentation for electric stimulation on electrokinetic-based microfluidic devices, which are meant to be integrated with lab-on-a-chip devices.
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Affiliation(s)
- M S Lopez-de la Fuente
- Electrical and Computer Engineering, Tecnologico de Monterrey, Nuevo Leon 64849, Mexico.
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23
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Adams TNG, Leonard KM, Minerick AR. Frequency sweep rate dependence on the dielectrophoretic response of polystyrene beads and red blood cells. BIOMICROFLUIDICS 2013; 7:64114. [PMID: 24396548 PMCID: PMC3874050 DOI: 10.1063/1.4833095] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Accepted: 11/11/2013] [Indexed: 05/12/2023]
Abstract
Alternating current (AC) dielectrophoresis (DEP) experiments for biological particles in microdevices are typically done at a fixed frequency. Reconstructing the DEP response curve from static frequency experiments is laborious, but essential to ascertain differences in dielectric properties of biological particles. Our lab explored the concept of sweeping the frequency as a function of time to rapidly determine the DEP response curve from fewer experiments. For the purpose of determining an ideal sweep rate, homogeneous 6.08 μm polystyrene (PS) beads were used as a model system. Translatability of the sweep rate approach to ∼7 μm red blood cells (RBC) was then verified. An Au/Ti quadrapole electrode microfluidic device was used to separately subject particles and cells to 10Vpp AC electric fields at frequencies ranging from 0.010 to 2.0 MHz over sweep rates from 0.00080 to 0.17 MHz/s. PS beads exhibited negative DEP assembly over the frequencies explored due to Maxwell-Wagner interfacial polarizations. Results demonstrate that frequency sweep rates must be slower than particle polarization timescales to achieve reliable incremental polarizations; sweep rates near 0.00080 MHz/s yielded DEP behaviors very consistent with static frequency DEP responses for both PS beads and RBCs.
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Affiliation(s)
- T N G Adams
- Department of Chemical Engineering, Michigan Technological University, Houghton, Michigan 49931, USA
| | - K M Leonard
- Department of Chemical Engineering, Michigan Technological University, Houghton, Michigan 49931, USA
| | - A R Minerick
- Department of Chemical Engineering, Michigan Technological University, Houghton, Michigan 49931, USA
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24
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Camacho-Alanis F, Gan L, Ros A. Transitioning Streaming to Trapping in DC Insulator-based Dielectrophoresis for Biomolecules. SENSORS AND ACTUATORS. B, CHEMICAL 2012; 173:668-675. [PMID: 23441049 PMCID: PMC3577371 DOI: 10.1016/j.snb.2012.07.080] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Exploiting dielectrophoresis (DEP) to concentrate and separate biomolecules has recently shown large potential as a microscale bioanalytical tool. Such efforts however require tailored devices and knowledge of all interplaying transport mechanisms competing with dielectrophoresis (DEP). Specifically, a strong DEP contribution to the overall transport mechanism is necessary to exploit DEP of biomolecules for analytical applications such as separation and fractionation. Here, we present improved microfluidic devices combining optical lithography and focused ion beam milling (FIBM) for the manipulation of DNA and proteins using insulator-based dielectrophoresis (iDEP) and direct current (DC) electric fields. Experiments were performed on an elastomer platform forming the iDEP microfluidic device with integrated nanoposts and nanopost arrays. Microscale and nanoscale iDEP was studied for λ-DNA (48.5 kbp) and the protein bovine serum albumin (BSA). Numerical simulations were adapted to the various tested geometries revealing excellent qualitative agreement with experimental observations for streaming and trapping DEP. Both the experimental and simulation results indicate that DC iDEP trapping for λ-DNA occurs with tailored nanoposts fabricated via FIBM. Moreover, streaming iDEP concentration of BSA is improved with integrated nanopost arrays by a factor of 45 compared to microfabricated arrays.
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25
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Martinez-Duarte R. Microfabrication technologies in dielectrophoresis applications--a review. Electrophoresis 2012; 33:3110-32. [PMID: 22941778 DOI: 10.1002/elps.201200242] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 06/10/2012] [Accepted: 06/11/2012] [Indexed: 11/12/2022]
Abstract
DEP is an established technique for particle manipulation. Although first demonstrated in the 1950s, it was not until the development of miniaturization techniques in the 1990s that DEP became a popular research field. The 1990s saw an explosion of DEP publications using microfabricated metal electrode arrays to sort a wide variety of cells. The concurrent development of microfluidics enabled devices for flow management and better understanding of the interaction between hydrodynamic and electrokinetic forces. Starting in the 2000s, alternative techniques have arisen to overcome common problems in metal-electrode DEP, such as electrode fouling, and to increase the throughput of the system. Insulator-based DEP and light-induced DEP are the most significant examples. Most recently, new 3D techniques such as carbon-electrode DEP, contactless DEP, and the use of doped PDMS have further simplified the fabrication process. The constant desire of the community to develop practical solutions has led to devices which are more user friendly, less expensive, and are capable of higher throughput. The state-of-the-art of fabricating DEP devices is critically reviewed in this work. The focus is on how different fabrication techniques can boost the development of practical DEP devices to be used in different settings such as clinical cell sorting and infection diagnosis, industrial food safety, and enrichment of particle populations for drug development.
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26
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Liao KT, Tsegaye M, Chaurey V, Chou CF, Swami NS. Nano-constriction device for rapid protein preconcentration in physiological media through a balance of electrokinetic forces. Electrophoresis 2012; 33:1958-66. [DOI: 10.1002/elps.201100707] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Mikiyas Tsegaye
- Electrical & Computer Engineering; University of Virginia; Charlottesville; VA; USA
| | - Vasudha Chaurey
- Electrical & Computer Engineering; University of Virginia; Charlottesville; VA; USA
| | - Chia-Fu Chou
- Institute of Physics; Academia Sinica; Taipei; Taiwan
| | - Nathan S. Swami
- Electrical & Computer Engineering; University of Virginia; Charlottesville; VA; USA
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27
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Chaurey V, Polanco C, Chou CF, Swami NS. Floating-electrode enhanced constriction dielectrophoresis for biomolecular trapping in physiological media of high conductivity. BIOMICROFLUIDICS 2012; 6:12806-1280614. [PMID: 22481998 PMCID: PMC3316617 DOI: 10.1063/1.3676069] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Accepted: 12/19/2011] [Indexed: 05/20/2023]
Abstract
We present an electrokinetic framework for designing insulator constriction-based dielectrophoresis devices with enhanced ability to trap nanoscale biomolecules in physiological media of high conductivity, through coupling short-range dielectrophoresis forces with long-range electrothermal flow. While a 500-fold constriction enables field focusing sufficient to trap nanoscale biomolecules by dielectrophoresis, the extent of this high-field region is enhanced through coupling the constriction to an electrically floating sensor electrode at the constriction floor. However, the enhanced localized fields due to the constriction and enhanced current within saline media of high conductivity (1 S/m) cause a rise in temperature due to Joule heating, resulting in a hotspot region midway within the channel depth at the constriction center, with temperatures of ∼8°-10°K above the ambient. While the resulting vortices from electrothermal flow are directed away from the hotspot region to oppose dielectrophoretic trapping, they also cause a downward and inward flow towards the electrode edges at the constriction floor. This assists biomolecular trapping at the sensor electrode through enabling long-range fluid sampling as well as through localized stirring by fluid circulation in its vicinity.
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28
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Sönmezoğlu S, Ateş Sönmezoğlu Ö. Optical and dielectric properties of double helix DNA thin films. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2011. [DOI: 10.1016/j.msec.2011.08.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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29
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Regtmeier J, Eichhorn R, Viefhues M, Bogunovic L, Anselmetti D. Electrodeless dielectrophoresis for bioanalysis: Theory, devices and applications. Electrophoresis 2011; 32:2253-73. [DOI: 10.1002/elps.201100055] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Revised: 05/31/2011] [Accepted: 06/01/2011] [Indexed: 01/05/2023]
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30
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Stanke S, Bier FF, Hölzel R. Fluid streaming above interdigitated electrodes in dielectrophoresis experiments. Electrophoresis 2011; 32:2448-55. [DOI: 10.1002/elps.201100096] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Revised: 03/25/2011] [Accepted: 04/13/2011] [Indexed: 11/10/2022]
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31
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Zhao H. Role of hydrodynamic behavior of DNA molecules in dielectrophoretic polarization under the action of an electric field. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2011; 84:021910. [PMID: 21929023 DOI: 10.1103/physreve.84.021910] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Revised: 06/23/2011] [Indexed: 05/31/2023]
Abstract
A continuum model is developed to predict the dielectrophoretic polarizability of coiled DNA molecules under the action of an alternating current electric field. The model approximates the coiled DNA molecule as a charged porous spherical particle. The model explains the discrepancies among scaling laws of polarizability of different-sized DNA molecules with contour length and such discrepancies are attributed to different hydrodynamic behavior. With zero or one fitting parameter, theoretical predictions are in good agreement with various experimental data, even though in experiments there are some uncertainties in regard to certain parameters.
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Affiliation(s)
- Hui Zhao
- Department of Mechanical Engineering, University of Nevada Las Vegas, Las Vegas, Nevada 89154, USA.
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32
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Kuzyk A. Dielectrophoresis at the nanoscale. Electrophoresis 2011; 32:2307-13. [PMID: 21800329 DOI: 10.1002/elps.201100038] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2011] [Revised: 03/13/2011] [Accepted: 04/08/2011] [Indexed: 11/08/2022]
Abstract
Dielectrophoresis has become a powerful tool for manipulation of various materials, such as metal and semiconducting particles, DNA molecules, nanowires and graphene. This short review is intended to provide the reader with an overview of the recent advances of application of dielectrophoresis at the nanoscale.
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Affiliation(s)
- Anton Kuzyk
- Lehrstuhl für Bioelektronik, Physik-Department und ZNN/WSI, Technische Universität München, Garching, Germany.
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33
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Nakano A, Chao TC, Camacho-Alanis F, Ros A. Immunoglobulin G and bovine serum albumin streaming dielectrophoresis in a microfluidic device. Electrophoresis 2011; 32:2314-22. [PMID: 21792990 DOI: 10.1002/elps.201100037] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2011] [Revised: 03/31/2011] [Accepted: 04/13/2011] [Indexed: 11/09/2022]
Abstract
Dielectrophoresis (DEP) has demonstrated to be a versatile tool to manipulate micro- and nanoparticles with applications for positioning, separation and fractionation. Recent developments of DEP have also shown that DEP can be used for the manipulation of biomolecules, such as DNA. Here, we focus on the manipulation of proteins using insulator-based dielectrophoresis (iDEP). We designed suitable post arrays in a microfluidic channel and use numerical simulations to calculate the electric field distribution as well as concentration of proteins according to a convection-diffusion model for both negative and positive DEP. Experimentally, we find DEP trapping of mainly protein aggregates in phosphate buffer. However, when adding a charged zwitterionic detergent, we observed DEP streamlining of immunoglobulin G (IgG) and bovine serum albumin (BSA). Our experimental observations are in excellent agreement with numerical simulations and indicate positive DEP behavior of IgG and BSA under the employed experimental conditions. Our results demonstrate DEP streaming of proteins in an iDEP device for the first time and indicate the potential of protein DEP for separation and fractionation.
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Affiliation(s)
- Asuka Nakano
- Department of Chemistry and Biochemistry, Arizona State University, Tempe 85287-1604, USA
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34
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Giraud G, Pethig R, Schulze H, Henihan G, Terry JG, Menachery A, Ciani I, Corrigan D, Campbell CJ, Mount AR, Ghazal P, Walton AJ, Crain J, Bachmann TT. Dielectrophoretic manipulation of ribosomal RNA. BIOMICROFLUIDICS 2011; 5:24116. [PMID: 21799722 PMCID: PMC3145241 DOI: 10.1063/1.3604395] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2011] [Accepted: 06/06/2011] [Indexed: 05/13/2023]
Abstract
The manipulation of ribosomal RNA (rRNA) extracted from E. coli cells by dielectrophoresis (DEP) has been demonstrated over the range of 3 kHz-50 MHz using interdigitated microelectrodes. Quantitative measurement using total internal reflection fluorescence microscopy of the time dependent collection indicated a positive DEP response characterized by a plateau between 3 kHz and 1 MHz followed by a decrease in response at higher frequencies. Negative DEP was observed above 9 MHz. The positive DEP response below 1 MHz is described by the Clausius-Mossotti model and corresponds to an induced dipole moment of 3300 D with a polarizability of 7.8×10(-32) F m(2). The negative DEP response above 9 MHz indicates that the rRNA molecules exhibit a net moment of -250 D, to give an effective permittivity value of 78.5 ε(0), close to that of the aqueous suspending medium, and a relatively small surface conductance value of ∼0.1 nS. This suggests that our rRNA samples have a fairly open structure accessible to the surrounding water molecules, with counterions strongly bound to the charged phosphate groups in the rRNA backbone. These results are the first demonstration of DEP for fast capture and release of rRNA units, opening new opportunities for rRNA-based biosensing devices.
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35
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Khoshmanesh K, Nahavandi S, Baratchi S, Mitchell A, Kalantar-zadeh K. Dielectrophoretic platforms for bio-microfluidic systems. Biosens Bioelectron 2011; 26:1800-14. [PMID: 20933384 DOI: 10.1016/j.bios.2010.09.022] [Citation(s) in RCA: 201] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2010] [Revised: 09/08/2010] [Accepted: 09/08/2010] [Indexed: 10/19/2022]
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36
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Regtmeier J, Eichhorn R, Bogunovic L, Ros A, Anselmetti D. Dielectrophoretic Trapping and Polarizability of DNA: The Role of Spatial Conformation. Anal Chem 2010; 82:7141-9. [DOI: 10.1021/ac1005475] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jan Regtmeier
- Experimental Biophysics and Applied Nanoscience, Faculty of Physics, Bielefeld University, Bielefeld, Germany, Nordic Institute for Theoretical Physics (Nordita), Stockholm, Sweden, and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287
| | - Ralf Eichhorn
- Experimental Biophysics and Applied Nanoscience, Faculty of Physics, Bielefeld University, Bielefeld, Germany, Nordic Institute for Theoretical Physics (Nordita), Stockholm, Sweden, and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287
| | - Lukas Bogunovic
- Experimental Biophysics and Applied Nanoscience, Faculty of Physics, Bielefeld University, Bielefeld, Germany, Nordic Institute for Theoretical Physics (Nordita), Stockholm, Sweden, and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287
| | - Alexandra Ros
- Experimental Biophysics and Applied Nanoscience, Faculty of Physics, Bielefeld University, Bielefeld, Germany, Nordic Institute for Theoretical Physics (Nordita), Stockholm, Sweden, and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287
| | - Dario Anselmetti
- Experimental Biophysics and Applied Nanoscience, Faculty of Physics, Bielefeld University, Bielefeld, Germany, Nordic Institute for Theoretical Physics (Nordita), Stockholm, Sweden, and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287
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37
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Henning A, Bier FF, Hölzel R. Dielectrophoresis of DNA: Quantification by impedance measurements. BIOMICROFLUIDICS 2010; 4:022803. [PMID: 20697597 PMCID: PMC2917884 DOI: 10.1063/1.3430550] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2010] [Accepted: 04/27/2010] [Indexed: 05/12/2023]
Abstract
Dielectrophoretic properties of DNA have been determined by measuring capacitance changes between planar microelectrodes. DNA sizes ranged from 100 bp to 48 kbp, DNA concentrations from below 0.1 to 70 mugml. Dielectrophoretic spectra exhibited maximum response around 3 kHz and 3 MHz. The strongest response was found for very long DNA (above 10 kbp) and for short 100 bp fragments, which corresponds to the persistence length of DNA. The method allows for an uncomplicated, automatic acquisition of the dielectrophoretic properties of submicroscopical objects without the need for labeling protocols or optical accessibility.
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Affiliation(s)
- Anja Henning
- Fraunhofer Institute for Biomedical Engineering, D-14476 Potsdam, Germany
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38
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Liu H, Zhu Y, Maginn E. Molecular Simulation of Polyelectrolye Conformational Dynamics under an AC Electric Field. Macromolecules 2010. [DOI: 10.1021/ma100354f] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Hongjun Liu
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556
| | - Yingxi Zhu
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556
| | - Edward Maginn
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556
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