1
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Zhang L, Tan QG, Fan JQ, Sun C, Luo YT, Liang RP, Qiu JD. Microfluidics for chiral separation of biomolecules. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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2
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Kochetkov KA, Bystrova NA, Pavlov PA, Oshchepkov MS, Oshchepkov AS. Microfluidic Asymmetrical Synthesis and Chiral Analysis. J IND ENG CHEM 2022. [DOI: 10.1016/j.jiec.2022.08.025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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3
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Selemani M, Castiaux AD, Martin RS. PolyJet-Based 3D Printing against Micromolds to Produce Channel Structures for Microchip Electrophoresis. ACS OMEGA 2022; 7:13362-13370. [PMID: 35474767 PMCID: PMC9026087 DOI: 10.1021/acsomega.2c01265] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 03/17/2022] [Indexed: 06/14/2023]
Abstract
In this work, we demonstrate the ability to use micromolds along with a stacked three-dimensional (3D) printing process on a commercially available PolyJet printer to fabricate microchip electrophoresis devices that have a T-intersection, with channel cross sections as small as 48 × 12 μm2 being possible. The fabrication process involves embedding removable materials or molds during the printing process, with various molds being possible (wires, brass molds, PDMS molds, or sacrificial materials). When the molds are delaminated/removed, recessed features complementary to the molds are left in the 3D prints. A thermal lab press is used to bond the microchannel layer that also contains printed reservoirs against another solid 3D-printed part to completely seal the microchannels. The devices exhibited cathodic electroosmotic flow (EOF), and mixtures of fluorescein isothiocyanate isomer I (FITC)-labeled amino acids were successfully separated on these 3D-printed devices using both gated and pinched electrokinetic injections. While this application is focused on microchip electrophoresis, the ability to 3D-print against molds that can subsequently be removed is a general methodology to decrease the channel size for other applications as well as to possibly integrate 3D printing with other production processes.
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Affiliation(s)
- Major
A. Selemani
- Department
of Chemistry, Saint Louis University, 3501 Laclede Ave., St. Louis, Missouri 63103, United States
| | - Andre D. Castiaux
- Center
for Additive Manufacturing, Saint Louis
University, 240 N Grand
Blvd, Saint Louis, Missouri 63103, United States
| | - R. Scott Martin
- Department
of Chemistry, Saint Louis University, 3501 Laclede Ave., St. Louis, Missouri 63103, United States
- Center
for Additive Manufacturing, Saint Louis
University, 240 N Grand
Blvd, Saint Louis, Missouri 63103, United States
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4
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Yu RB, Quirino JP. Bile Salts in Chiral Micellar Electrokinetic Chromatography: 2000-2020. Molecules 2021; 26:molecules26185531. [PMID: 34577002 PMCID: PMC8468585 DOI: 10.3390/molecules26185531] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Revised: 09/07/2021] [Accepted: 09/08/2021] [Indexed: 12/28/2022] Open
Abstract
Bile salts are naturally occurring chiral surfactants that are able to solubilize hydrophobic compounds. Because of this ability, bile salts were exploited as chiral selectors added to the background solution (BGS) in the chiral micellar electrokinetic chromatography (MEKC) of various small molecules. In this review, we aimed to examine the developments in research on chiral MEKC using bile salts as chiral selectors over the past 20 years. The review begins with a discussion of the aggregation of bile salts in chiral recognition and separation, followed by the use of single bile salts and bile salts with other chiral selectors (i.e., cyclodextrins, proteins and single-stranded DNA aptamers). Advanced techniques such as partial-filling MEKC, stacking and single-drop microextraction were considered. Potential applications to real samples, including enantiomeric impurity analysis, were also discussed.
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5
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Lu N, Kutter JP. Recent advances in microchip enantioseparation and analysis. Electrophoresis 2020; 41:2122-2135. [PMID: 32949465 DOI: 10.1002/elps.202000242] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2020] [Revised: 09/10/2020] [Accepted: 09/16/2020] [Indexed: 12/26/2022]
Abstract
This review summarizes recent developments (over the past decade) in the field of microfluidics-based solutions for enantiomeric separation and detection. The progress in various formats of microchip electrodriven separations, such as MCE, microchip electrochromatography, and multidimensional separation techniques, is discussed. Innovations covering chiral stationary phases, surface coatings, and modification strategies to improve resolution, as well as integration with detection systems, are reported. Finally, combinations with other microfluidic functional units are also presented and highlighted.
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Affiliation(s)
- Nan Lu
- Department of Pharmacy, University of Copenhagen, Copenhagen, Denmark
| | - Jörg P Kutter
- Department of Pharmacy, University of Copenhagen, Copenhagen, Denmark
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6
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Chiral Micellar Electrokinetic Chromatography. J Chromatogr A 2020; 1626:461383. [PMID: 32797856 DOI: 10.1016/j.chroma.2020.461383] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2020] [Revised: 06/29/2020] [Accepted: 06/30/2020] [Indexed: 12/18/2022]
Abstract
The potential of Micellar Electrokinetic Chromatography to achieve enantiomeric separations is reviewed in this article. The separation principles and the most frequently employed separation strategies to achieve chiral separations by Micellar Electrokinetic Chromatography are described. The use of chiral micellar systems alone or combined with other micellar systems or chiral selectors, as well as of mixtures of achiral micellar systems with chiral selectors is discussed together with the effect of different additives present in the separation medium. Indirect methods based on the derivatization of analytes with chiral derivatizing reagents and the use of achiral micelles are also considered. Preconcentration techniques employed to improve sensitivity and the main approaches developed to facilitate the coupling with Mass Spectrometry are included. The most recent and relevant methodologies developed by chiral Micellar Electrokinetic Chromatography and their applications in different fields are presented.
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7
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Kim J, Park SM, Choi D, Kim DS. Direct Fabrication of Freestanding and Patterned Nanoporous Junctions in a 3D Micro-Nanofluidic Device for Ion-Selective Transport. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2000998. [PMID: 32346996 DOI: 10.1002/smll.202000998] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/28/2020] [Accepted: 03/30/2020] [Indexed: 06/11/2023]
Abstract
In the field of micro-nanofluidics, a freestanding configuration of a nanoporous junction is highly demanded to increase the design flexibility of the microscale device and the interfacial area between the nanoporous junction and microchannels, thereby improving the functionality and performance. This work first reports direct fabrication and incorporation of a freestanding nanoporous junction in a microfluidic device by performing an electrolyte-assisted electrospinning process to fabricate a freestanding nanofiber membrane and subsequently impregnating the nanofiber membrane with a nanoporous precursor material followed by a solidification process. This process also enables to readily control the geometry of the nanoporous junction depending on its application. By these advantages, vertically stacked 3D micro-nanofluidic devices with complex configurations are easily achieved. To demonstrate the broad applicability of this process in various research fields, a reverse electrodialysis-based energy harvester and an ion concentration polarization-based preconcentrator are produced. The freestanding Nafion-polyvinylidene fluoride nanofiber membrane (F-NPNM) energy harvester generates a high power (59.87 nW) owing to the enlarged interfacial area. Besides, 3D multiplexed and multi-stacked F-NPNM preconcentrators accumulate multiple preconcentrated plugs that can increase the operating sample volume and the degree of freedom of handling. Hence, the proposed process is expected to contribute to numerous research fields related to micro-nanofluidics in the future.
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Affiliation(s)
- Junhyun Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Pohang, Gyeongbuk, 37673, South Korea
| | - Sang Min Park
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Pohang, Gyeongbuk, 37673, South Korea
| | - Dongwhi Choi
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Pohang, Gyeongbuk, 37673, South Korea
| | - Dong Sung Kim
- Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-ro, Pohang, Gyeongbuk, 37673, South Korea
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8
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Dhali R, John C, Swathi RS. Quantum Transmission of He Isotopes through Crown Ether-Embedded Graphene Nanomeshes: An Eckart Potential Approach. J Phys Chem A 2019; 123:7499-7506. [DOI: 10.1021/acs.jpca.9b06677] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rama Dhali
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Thiruvananthapuram, 695551 Kerala, India
| | - Chris John
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Thiruvananthapuram, 695551 Kerala, India
| | - Rotti Srinivasamurthy Swathi
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Thiruvananthapuram, 695551 Kerala, India
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9
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Owais C, James A, John C, Dhali R, Swathi RS. Selective Permeation through One-Atom-Thick Nanoporous Carbon Membranes: Theory Reveals Excellent Design Strategies! J Phys Chem B 2018; 122:5127-5146. [DOI: 10.1021/acs.jpcb.8b01117] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Cheriyacheruvakkara Owais
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Vithura, Thiruvananthapuram 695551, India
| | - Anto James
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Vithura, Thiruvananthapuram 695551, India
| | - Chris John
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Vithura, Thiruvananthapuram 695551, India
| | - Rama Dhali
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Vithura, Thiruvananthapuram 695551, India
| | - Rotti Srinivasamurthy Swathi
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram (IISER-TVM), Vithura, Thiruvananthapuram 695551, India
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10
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Losno M, Ferrante I, Brennetot R, Varlet J, Blanc C, Grenut B, Amblard E, Descroix S, Mariet C. Photochemical Synthesis and Versatile Functionalization Method of a Robust Porous Poly(ethylene glycol methacrylate-co-allyl methacrylate) Monolith Dedicated to Radiochemical Separation in a Centrifugal Microfluidic Platform. MICROMACHINES 2016; 7:E45. [PMID: 30407417 PMCID: PMC6189732 DOI: 10.3390/mi7030045] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2016] [Revised: 03/02/2016] [Accepted: 03/07/2016] [Indexed: 12/12/2022]
Abstract
The use of a centrifugal microfluidic platform is an alternative to classical chromatographic procedures for radiochemistry. An ion-exchange support with respect to the in situ light-addressable process of elaboration is specifically designed to be incorporated as a radiochemical sample preparation module in centrifugal microsystem devices. This paper presents a systematic study of the synthesis of the polymeric porous monolith poly(ethylene glycol methacrylate-co-allyl methacrylate) used as a solid-phase support and the versatile and robust photografting process of the monolith based on thiol-ene click chemistry. The polymerization reaction is investigated, varying the formulation of the polymerisable mixture. The robustness of the stationary phase was tested in concentrated nitric acid. Thanks to their unique "easy-to-use" features, centrifugal microfluidic platforms are potential successful candidates for the downscaling of chromatographic separation of radioactive samples (automation, multiplexing, easy integration in glove-boxes environment, and low cost of maintenance).
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Affiliation(s)
- Marion Losno
- Den-Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), CEA, Université Paris-Saclay, F-91191 Gif sur Yvette, France.
| | - Ivan Ferrante
- MMBM Group, Institut Curie Research Center, CNRS UMR 168, F-75005 Paris, France.
| | - René Brennetot
- Den-Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), CEA, Université Paris-Saclay, F-91191 Gif sur Yvette, France.
| | - Jérôme Varlet
- Den-Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), CEA, Université Paris-Saclay, F-91191 Gif sur Yvette, France.
| | - Cécile Blanc
- Den-Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), CEA, Université Paris-Saclay, F-91191 Gif sur Yvette, France.
| | - Bernard Grenut
- Den-Service d'Etude du Comportement des Radionucléides (SECR), CEA, Université Paris-Saclay, F-91191 Gif sur Yvette, France.
| | - Etienne Amblard
- Den-Service d'Etude du Comportement des Radionucléides (SECR), CEA, Université Paris-Saclay, F-91191 Gif sur Yvette, France.
| | - Stéphanie Descroix
- MMBM Group, Institut Curie Research Center, CNRS UMR 168, F-75005 Paris, France.
| | - Clarisse Mariet
- Den-Service d'Etudes Analytiques et de Réactivité des Surfaces (SEARS), CEA, Université Paris-Saclay, F-91191 Gif sur Yvette, France.
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11
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Řezanka P, Navrátilová K, Řezanka M, Král V, Sýkora D. Application of cyclodextrins in chiral capillary electrophoresis. Electrophoresis 2014; 35:2701-21. [DOI: 10.1002/elps.201400145] [Citation(s) in RCA: 123] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 05/14/2014] [Accepted: 05/19/2014] [Indexed: 12/13/2022]
Affiliation(s)
- Pavel Řezanka
- Department of Analytical Chemistry; Institute of Chemical Technology; Prague Czech Republic
| | - Klára Navrátilová
- Department of Analytical Chemistry; Institute of Chemical Technology; Prague Czech Republic
| | - Michal Řezanka
- Institute for Nanomaterials; Advanced Technologies and Innovation; Technical University of Liberec; Liberec Czech Republic
| | - Vladimír Král
- Department of Analytical Chemistry; Institute of Chemical Technology; Prague Czech Republic
| | - David Sýkora
- Department of Analytical Chemistry; Institute of Chemical Technology; Prague Czech Republic
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12
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Gibson LR, Bohn PW. Non-aqueous microchip electrophoresis for characterization of lipid biomarkers. Interface Focus 2014; 3:20120096. [PMID: 24427539 DOI: 10.1098/rsfs.2012.0096] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
In vivo measurements of lipid biomarkers are hampered by their low solubility in aqueous solution, which limits the choices for molecular separations. Here, we introduce non-aqueous microchip electrophoretic separations of lipid mixtures performed in three-dimensional hybrid nanofluidic/microfluidic polymeric devices. Electrokinetic injection is used to reproducibly introduce discrete femtolitre to picolitre volumes of charged lipids into a separation microchannel containing low (100 μM-10 mM) concentration tetraalkylammonium tetraphenylborate background electrolyte (BGE) in N-methylformamide, supporting rapid electro-osmotic fluid flow in polydimethylsiloxane microchannels. The quality of the resulting electrophoretic separations depends on the voltage and timing of the injection pulse, the BGE concentration and the electric field strength. Injected volumes increase with longer injection pulse widths and higher injection pulse amplitudes. Separation efficiency, as measured by total plate number, N, increases with increasing electric field and with decreasing BGE concentration. Electrophoretic separations of binary and ternary lipid mixtures were achieved with high resolution (R s ∼ 5) and quality (N > 7.7 × 10(6) plates m(-1)). Rapid in vivo monitoring of lipid biomarkers requires high-quality separation and detection of lipids downstream of microdialysis sample collection, and the multilayered non-aqueous microfluidic devices studied here offer one possible avenue to swiftly process complex lipid samples. The resulting capability may make it possible to correlate oxidative stress with in vivo lipid biomarker levels.
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Affiliation(s)
- Larry R Gibson
- Department of Chemical and Biomolecular Engineering , University of Notre Dame , Notre Dame, IN 46556 , USA
| | - Paul W Bohn
- Department of Chemical and Biomolecular Engineering , University of Notre Dame , Notre Dame, IN 46556 , USA ; Department of Chemistry and Biochemistry , University of Notre Dame , Notre Dame, IN 46556 , USA
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13
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Wei GW. Multiscale Multiphysics and Multidomain Models I: Basic Theory. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2013; 12:10.1142/S021963361341006X. [PMID: 25382892 PMCID: PMC4220694 DOI: 10.1142/s021963361341006x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This work extends our earlier two-domain formulation of a differential geometry based multiscale paradigm into a multidomain theory, which endows us the ability to simultaneously accommodate multiphysical descriptions of aqueous chemical, physical and biological systems, such as fuel cells, solar cells, nanofluidics, ion channels, viruses, RNA polymerases, molecular motors and large macromolecular complexes. The essential idea is to make use of the differential geometry theory of surfaces as a natural means to geometrically separate the macroscopic domain of solvent from the microscopic domain of solute, and dynamically couple continuum and discrete descriptions. Our main strategy is to construct energy functionals to put on an equal footing of multiphysics, including polar (i.e., electrostatic) solvation, nonpolar solvation, chemical potential, quantum mechanics, fluid mechanics, molecular mechanics, coarse grained dynamics and elastic dynamics. The variational principle is applied to the energy functionals to derive desirable governing equations, such as multidomain Laplace-Beltrami (LB) equations for macromolecular morphologies, multidomain Poisson-Boltzmann (PB) equation or Poisson equation for electrostatic potential, generalized Nernst-Planck (NP) equations for the dynamics of charged solvent species, generalized Navier-Stokes (NS) equation for fluid dynamics, generalized Newton's equations for molecular dynamics (MD) or coarse-grained dynamics and equation of motion for elastic dynamics. Unlike the classical PB equation, our PB equation is an integral-differential equation due to solvent-solute interactions. To illustrate the proposed formalism, we have explicitly constructed three models, a multidomain solvation model, a multidomain charge transport model and a multidomain chemo-electro-fluid-MD-elastic model. Each solute domain is equipped with distinct surface tension, pressure, dielectric function, and charge density distribution. In addition to long-range Coulombic interactions, various non-electrostatic solvent-solute interactions are considered in the present modeling. We demonstrate the consistency between the non-equilibrium charge transport model and the equilibrium solvation model by showing the systematical reduction of the former to the latter at equilibrium. This paper also offers a brief review of the field.
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Affiliation(s)
- Guo-Wei Wei
- Department of Mathematics Michigan State University, MI 48824, USA Department of Electrical and Computer Engineering Michigan State University, MI 48824, USA Department of Biochemistry and Molecular Biology Michigan State University, MI 48824, USA
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14
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Shundo A, Hori K, Ikeda T, Kimizuka N, Tanaka K. Design of a Dynamic Polymer Interface for Chiral Discrimination. J Am Chem Soc 2013; 135:10282-5. [DOI: 10.1021/ja404701s] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Atsuomi Shundo
- Department
of Applied Chemistry, ‡International Institute for Carbon-Neutral Energy
Research (WPI-I2CNER) and §Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395,
Japan
| | - Koichiro Hori
- Department
of Applied Chemistry, ‡International Institute for Carbon-Neutral Energy
Research (WPI-I2CNER) and §Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395,
Japan
| | - Takuya Ikeda
- Department
of Applied Chemistry, ‡International Institute for Carbon-Neutral Energy
Research (WPI-I2CNER) and §Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395,
Japan
| | - Nobuo Kimizuka
- Department
of Applied Chemistry, ‡International Institute for Carbon-Neutral Energy
Research (WPI-I2CNER) and §Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395,
Japan
| | - Keiji Tanaka
- Department
of Applied Chemistry, ‡International Institute for Carbon-Neutral Energy
Research (WPI-I2CNER) and §Center for Future Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395,
Japan
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15
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Mellors JS, Black WA, Chambers AG, Starkey JA, Lacher NA, Ramsey JM. Hybrid Capillary/Microfluidic System for Comprehensive Online Liquid Chromatography-Capillary Electrophoresis-Electrospray Ionization-Mass Spectrometry. Anal Chem 2013; 85:4100-6. [DOI: 10.1021/ac400205a] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
| | | | | | - Jason A. Starkey
- Pfizer Biotherapuetics R&D, Pfizer Inc., Chesterfield, Missouri 63017, United States
| | - Nathan A. Lacher
- Pfizer Biotherapuetics R&D, Pfizer Inc., Chesterfield, Missouri 63017, United States
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16
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Recent advances in microchip electrophoresis for amino acid analysis. Anal Bioanal Chem 2013; 405:7907-18. [DOI: 10.1007/s00216-013-6830-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2012] [Revised: 01/25/2013] [Accepted: 02/07/2013] [Indexed: 12/27/2022]
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17
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Reischl RJ, Lindner W. Methoxyquinoline labeling—A new strategy for the enantioseparation of all chiral proteinogenic amino acids in 1-dimensional liquid chromatography using fluorescence and tandem mass spectrometric detection. J Chromatogr A 2012; 1269:262-9. [DOI: 10.1016/j.chroma.2012.07.046] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2012] [Revised: 07/12/2012] [Accepted: 07/17/2012] [Indexed: 10/28/2022]
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18
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Wu ZY, Fang F, He YQ, Li TT, Li JJ, Tian L. Flexible and Efficient Eletrokinetic Stacking of DNA and Proteins at an HF Etched Porous Junction on a Fused Silica Capillary. Anal Chem 2012; 84:7085-91. [DOI: 10.1021/ac301364j] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhi-Yong Wu
- Research
Center for Analytical Sciences, ‡Chemistry Department, Northeastern University, Shenyang 110819, PR China
| | - Fang Fang
- Research
Center for Analytical Sciences, ‡Chemistry Department, Northeastern University, Shenyang 110819, PR China
| | - Yan-Qin He
- Research
Center for Analytical Sciences, ‡Chemistry Department, Northeastern University, Shenyang 110819, PR China
| | - Ting-Ting Li
- Research
Center for Analytical Sciences, ‡Chemistry Department, Northeastern University, Shenyang 110819, PR China
| | - Jing-Jing Li
- Research
Center for Analytical Sciences, ‡Chemistry Department, Northeastern University, Shenyang 110819, PR China
| | - Li Tian
- Research
Center for Analytical Sciences, ‡Chemistry Department, Northeastern University, Shenyang 110819, PR China
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19
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Chen Q, Wu J, Zhang Y, Lin JM. Qualitative and Quantitative Analysis of Tumor Cell Metabolism via Stable Isotope Labeling Assisted Microfluidic Chip Electrospray Ionization Mass Spectrometry. Anal Chem 2012; 84:1695-701. [DOI: 10.1021/ac300003k] [Citation(s) in RCA: 113] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Qiushui Chen
- Beijing Key Laboratory of Analytical
Methods and Instrumentation,
Department of Chemistry, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Jing Wu
- Beijing Key Laboratory of Analytical
Methods and Instrumentation,
Department of Chemistry, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Yandong Zhang
- Beijing Key Laboratory of Analytical
Methods and Instrumentation,
Department of Chemistry, Tsinghua University, Beijing 100084, People’s Republic of China
| | - Jin-Ming Lin
- Beijing Key Laboratory of Analytical
Methods and Instrumentation,
Department of Chemistry, Tsinghua University, Beijing 100084, People’s Republic of China
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20
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Sheng Y, Bowser MT. Size selective DNA transport through a nanoporous membrane in a PDMS microfluidic device. Analyst 2012; 137:1144-51. [PMID: 22262059 DOI: 10.1039/c2an15966j] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A microfluidic counter current dialysis device for size based purification of DNA is described. The device consists of two polydimethylsiloxane (PDMS) channels separated by a track etched polycarbonate membrane with a 50 nm pore size. Recovery of fluorescein across the membrane was compared with 10 and 80 nucleotide (nt) ssDNA to characterize the device. Recovery of all three analytes improved with decreasing flow rate. Size selectivity was observed. Greater than 2-fold selectivity between 10 nt and 80 nt ssDNA was observed at linear velocities less than 3mm s(-1). Increasing the ionic strength of the buffer increased transport across the membrane. Recovery of 80 nt ssDNA increased over 4-fold by adding 30 mM NaCl to the buffer. The effect was size dependent as 10 nt showed a smaller increase while the recovery of fluorescein was largely unaffected by increasing the ionic strength of the buffer.
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Affiliation(s)
- Yixiao Sheng
- Department of Biomedical Engineering, University of Minnesota, Minneapolis, MN 55455, USA
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Wei GW, Zheng Q, Chen Z, Xia K. Variational multiscale models for charge transport. SIAM REVIEW. SOCIETY FOR INDUSTRIAL AND APPLIED MATHEMATICS 2012; 54:699-754. [PMID: 23172978 PMCID: PMC3501390 DOI: 10.1137/110845690] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
This work presents a few variational multiscale models for charge transport in complex physical, chemical and biological systems and engineering devices, such as fuel cells, solar cells, battery cells, nanofluidics, transistors and ion channels. An essential ingredient of the present models, introduced in an earlier paper (Bulletin of Mathematical Biology, 72, 1562-1622, 2010), is the use of differential geometry theory of surfaces as a natural means to geometrically separate the macroscopic domain from the microscopic domain, meanwhile, dynamically couple discrete and continuum descriptions. Our main strategy is to construct the total energy functional of a charge transport system to encompass the polar and nonpolar free energies of solvation, and chemical potential related energy. By using the Euler-Lagrange variation, coupled Laplace-Beltrami and Poisson-Nernst-Planck (LB-PNP) equations are derived. The solution of the LB-PNP equations leads to the minimization of the total free energy, and explicit profiles of electrostatic potential and densities of charge species. To further reduce the computational complexity, the Boltzmann distribution obtained from the Poisson-Boltzmann (PB) equation is utilized to represent the densities of certain charge species so as to avoid the computationally expensive solution of some Nernst-Planck (NP) equations. Consequently, the coupled Laplace-Beltrami and Poisson-Boltzmann-Nernst-Planck (LB-PBNP) equations are proposed for charge transport in heterogeneous systems. A major emphasis of the present formulation is the consistency between equilibrium LB-PB theory and non-equilibrium LB-PNP theory at equilibrium. Another major emphasis is the capability of the reduced LB-PBNP model to fully recover the prediction of the LB-PNP model at non-equilibrium settings. To account for the fluid impact on the charge transport, we derive coupled Laplace-Beltrami, Poisson-Nernst-Planck and Navier-Stokes equations from the variational principle for chemo-electro-fluid systems. A number of computational algorithms is developed to implement the proposed new variational multiscale models in an efficient manner. A set of ten protein molecules and a realistic ion channel, Gramicidin A, are employed to confirm the consistency and verify the capability. Extensive numerical experiment is designed to validate the proposed variational multiscale models. A good quantitative agreement between our model prediction and the experimental measurement of current-voltage curves is observed for the Gramicidin A channel transport. This paper also provides a brief review of the field.
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Affiliation(s)
- Guo-Wei Wei
- Department of Mathematics Michigan State University, MI 48824, USA
- Department of Electrical and Computer Engineering Michigan State University, MI 48824, USA
- Address correspondences to Guo-Wei Wei.
| | - Qiong Zheng
- Department of Mathematics Michigan State University, MI 48824, USA
| | - Zhan Chen
- Department of Mathematics Michigan State University, MI 48824, USA
| | - Kelin Xia
- Department of Mathematics Michigan State University, MI 48824, USA
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Viglio S, Fumagalli M, Ferrari F, Bardoni A, Salvini R, Giuliano S, Iadarola P. Recent novel MEKC applications to analyze free amino acids in different biomatrices: 2009-2010. Electrophoresis 2011; 33:36-47. [DOI: 10.1002/elps.201100336] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2011] [Revised: 07/28/2011] [Accepted: 08/02/2011] [Indexed: 11/07/2022]
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23
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Huang Y, Shi M, Zhao S, Liang H. Trace analysis of d-tyrosine in biological samples by microchip electrophoresis with laser induced fluorescence detection. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:3203-7. [DOI: 10.1016/j.jchromb.2011.01.033] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2010] [Revised: 01/23/2011] [Accepted: 01/27/2011] [Indexed: 01/09/2023]
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24
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Han C, Hou X, Zhang H, Guo W, Li H, Jiang L. Enantioselective Recognition in Biomimetic Single Artificial Nanochannels. J Am Chem Soc 2011; 133:7644-7. [DOI: 10.1021/ja2004939] [Citation(s) in RCA: 219] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cuiping Han
- Key Laboratory of Pesticide and Chemical Biology (CCNU), Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P. R. China
| | - Xu Hou
- National Center for Nanoscience and Technology, Beijing 100190, P. R. China
| | - Huacheng Zhang
- Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Wei Guo
- Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Haibing Li
- Key Laboratory of Pesticide and Chemical Biology (CCNU), Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, P. R. China
| | - Lei Jiang
- Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- Beijing University of Aeronautics and Astronautics, Beijing 100191, P. R. China
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25
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Nagl S, Schulze P, Ohla S, Beyreiss R, Gitlin L, Belder D. Microfluidic chips for chirality exploration. Anal Chem 2011; 83:3232-8. [DOI: 10.1021/ac200150w] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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26
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Wang Q, Hessel V, Rebrov EV, Werner B. 3D Analysis of Heat Transfer Intensification by Re-Entrance Flow Pin-Fins Microstructures with a Highly Thermal-Conductive Plate. Chem Eng Technol 2011. [DOI: 10.1002/ceat.201000376] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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27
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Silva M. Micellar electrokinetic chromatography: A practical overview of current methodological and instrumental advances. Electrophoresis 2010; 32:149-65. [DOI: 10.1002/elps.201000344] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2010] [Revised: 07/27/2010] [Accepted: 07/27/2010] [Indexed: 12/22/2022]
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28
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Ross D, Shackman JG, Kralj JG, Atencia J. 2D separations on a 1D chip: gradient elution moving boundary electrophoresis-chiral capillary zone electrophoresis. LAB ON A CHIP 2010; 10:3139-3148. [PMID: 20886128 DOI: 10.1039/c004819d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A new method is described for two-dimensional (2D) separations using a microfluidic chip normally employed for single dimension electrophoresis. The method employs a combination of gradient elution moving boundary electrophoresis (GEMBE) and chiral capillary zone electrophoresis (CZE). The simplicity of the first dimension GEMBE method enables its implementation in the injection channel of a conventional electrophoresis chip, simplifying the design and operation of the device. The method was used for high resolution 2D chiral separations of a mixture of amino acids considered as possible signatures of extant or extinct life for solar system exploration. The enantiomers of aspartic acid, glutamic acid, serine, alanine, and valine were all resolved as well as glycine (achiral) and several unidentified impurities, giving an estimated peak capacity of 35 for the region between valine and glycine. The results highlight the need for high peak capacity separations for chiral amino acid analysis if accurate enantiomeric ratios are to be determined.
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Affiliation(s)
- David Ross
- National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
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29
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Xu BY, Xu JJ, Xia XH, Chen HY. Large scale lithography-free nano channel array on polystyrene. LAB ON A CHIP 2010; 10:2894-901. [PMID: 20922216 DOI: 10.1039/c005245k] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
This paper reports a new fabrication method of lithography-free nanochannel array. It is based on the cracking process on the surface of a polystyrene (PS) Petri-dish, one type of thermoplastic that is composed of uni-axial macromolecular chains. Under proper conditions, parallel nanochannels with equal interspaces are obtained. Control over the channel depth from 20 nm to 200 nm is achieved, with the channel length reaching tens of millimetres. The PDMS replication based on PS nanochannel array has been successfully carried out. In combination with the microstructure, both an ion enrichment device and a current rectification device are fabricated, and their quantified characters manifested the applicability of the channel array structure in nanofluidics.
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Affiliation(s)
- Bi-Yi Xu
- Key Laboratory of Analytical Chemistry for Life Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, China
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Piruska A, Branagan SP, Minnis AB, Wang Z, Cropek DM, Sweedler JV, Bohn PW. Electrokinetic control of fluid transport in gold-coated nanocapillary array membranes in hybrid nanofluidic-microfluidic devices. LAB ON A CHIP 2010; 10:1237-1244. [PMID: 20445875 DOI: 10.1039/b924164g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The introduction of metallic elements into microfluidic devices that support electrokinetic transport creates several fundamental issues relative to the high conductivity of the metal, which can act as a current shunt, causing profound effects on the transport process. Here we examine the use of Au-coated nanocapillary array membranes (Au NCAMs) as electrically addressable fluid control elements in multi-layer microfluidic architectures. Three alternative methods for fluid injection across Au NCAMs are presented: electrokinetic injection across NCAMs with Au coated on one side (asymmetric NCAM), electrokinetic injection across NCAMs with an embedded Au layer (symmetric NCAM), and field-free electroosmotic flow (EOF) pumping across either type of Au NCAM. Injection efficiency across asymmetric NCAMs depends on the orientation of the asymmetric membrane relative to the driving potential. Efficient injections are enabled when the Au coating is on the receiving side of the membrane, however, some distortion of the injected volume element is observed, especially with large injection potentials. These results for asymmetric membranes agree qualitatively with two-dimensional numerical simulations of injections across a single slit pore, which suggest that the direction-selective transport behavior is related to electrophoretic transport of the anionic fluorescein probe. Reproducible, high quality injections are also achieved in symmetric Au NCAMs having an embedded gold nanoband region within the nanopores. Nanoband Au NCAMs are excellent candidates for a range of applications, including high efficiency electrochemical sensing, electrochemically catalyzed conversion or pretreatment and label free sensing utilizing extraordinary optical transmission. EOF pumping could be an alternative to electrokinetic injections in some applications, however, this approach is only useful for relatively large pore sizes (>400 nm) and presents considerably worse sample spreading via Taylor dispersion.
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Affiliation(s)
- Aigars Piruska
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN 46556, USA
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31
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Arora A, Simone G, Salieb-Beugelaar GB, Kim JT, Manz A. Latest Developments in Micro Total Analysis Systems. Anal Chem 2010; 82:4830-47. [PMID: 20462185 DOI: 10.1021/ac100969k] [Citation(s) in RCA: 372] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Arun Arora
- KIST Europe, Korea Institute of Science and Technology, Campus E71, 66123 Saarbrücken, Germany, FRIAS, Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Albertstrasse 19, 79104 Freiburg, Germany, IMTEK, Institute for Microsystem Technology, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany, and MESA+ Institute for Nanotechnology/Lab-on-a-Chip Group, Twente University, Building Carré, 7500 AE, Enschede, The Netherlands
| | - Giuseppina Simone
- KIST Europe, Korea Institute of Science and Technology, Campus E71, 66123 Saarbrücken, Germany, FRIAS, Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Albertstrasse 19, 79104 Freiburg, Germany, IMTEK, Institute for Microsystem Technology, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany, and MESA+ Institute for Nanotechnology/Lab-on-a-Chip Group, Twente University, Building Carré, 7500 AE, Enschede, The Netherlands
| | - Georgette B. Salieb-Beugelaar
- KIST Europe, Korea Institute of Science and Technology, Campus E71, 66123 Saarbrücken, Germany, FRIAS, Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Albertstrasse 19, 79104 Freiburg, Germany, IMTEK, Institute for Microsystem Technology, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany, and MESA+ Institute for Nanotechnology/Lab-on-a-Chip Group, Twente University, Building Carré, 7500 AE, Enschede, The Netherlands
| | - Jung Tae Kim
- KIST Europe, Korea Institute of Science and Technology, Campus E71, 66123 Saarbrücken, Germany, FRIAS, Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Albertstrasse 19, 79104 Freiburg, Germany, IMTEK, Institute for Microsystem Technology, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany, and MESA+ Institute for Nanotechnology/Lab-on-a-Chip Group, Twente University, Building Carré, 7500 AE, Enschede, The Netherlands
| | - Andreas Manz
- KIST Europe, Korea Institute of Science and Technology, Campus E71, 66123 Saarbrücken, Germany, FRIAS, Freiburg Institute for Advanced Studies, Albert-Ludwigs-Universität Freiburg, Albertstrasse 19, 79104 Freiburg, Germany, IMTEK, Institute for Microsystem Technology, University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany, and MESA+ Institute for Nanotechnology/Lab-on-a-Chip Group, Twente University, Building Carré, 7500 AE, Enschede, The Netherlands
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32
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Higuchi A, Tamai M, Ko YA, Tagawa YI, Wu YH, Freeman BD, Bing JT, Chang Y, Ling QD. Polymeric Membranes for Chiral Separation of Pharmaceuticals and Chemicals. POLYM REV 2010. [DOI: 10.1080/15583721003698853] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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33
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Piruska A, Gong M, Sweedler JV, Bohn PW. Nanofluidics in chemical analysis. Chem Soc Rev 2010; 39:1060-72. [DOI: 10.1039/b900409m] [Citation(s) in RCA: 146] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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34
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Reschke BR, Schiffbauer J, Edwards BF, Timperman AT. Simultaneous separation and detection of cations and anions on a microfluidic device with suppressed electroosmotic flow and a single injection point. Analyst 2010; 135:1351-9. [DOI: 10.1039/b921914e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Skinner CD. A liquid chromatography to capillary array electrophoresis interface for two-dimensional separations. Analyst 2010; 135:358-67. [DOI: 10.1039/b915586d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Sánchez-Hernández L, GarcÃa-Ruiz C, Luisa Marina M, Luis Crego A. Recent approaches for enhancing sensitivity in enantioseparations by CE. Electrophoresis 2010; 31:28-43. [DOI: 10.1002/elps.200900429] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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