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Current Trends and Challenges in Point-of-care Urinalysis of Biomarkers in Trace Amounts. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2022.116786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Mikhail IE, Tehranirokh M, Gooley AA, Guijt RM, Breadmore MC. Hyphenated sample preparation-electrospray and nano-electrospray ionization mass spectrometry for biofluid analysis. J Chromatogr A 2021; 1646:462086. [PMID: 33892255 DOI: 10.1016/j.chroma.2021.462086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 03/18/2021] [Accepted: 03/19/2021] [Indexed: 10/21/2022]
Abstract
Stand-alone electrospray ionization mass spectrometry (ESI-MS) has been advancing through enhancements in throughput, selectivity and sensitivity of mass spectrometers. Unlike traditional MS techniques which usually require extensive offline sample preparation and chromatographic separation, many sample preparation techniques are now directly coupled with stand-alone MS to enable outstanding throughput for bioanalysis. In this review, we summarize the different sample clean-up and/or analyte enrichment strategies that can be directly coupled with ESI-MS and nano-ESI-MS for the analysis of biological fluids. The overview covers the hyphenation of different sample preparation techniques including solid phase extraction (SPE), solid phase micro-extraction (SPME), slug flow micro-extraction/nano-extraction (SFME/SFNE), liquid extraction surface analysis (LESA), extraction electrospray, extraction using digital microfluidics (DMF), and electrokinetic extraction (EkE) with ESI-MS and nano-ESI-MS.
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Affiliation(s)
- Ibraam E Mikhail
- ARC Training Centre for Portable Analytical Separation Technologies (ASTech), Australia; Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences (Chemistry), University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia; Department of Analytical Chemistry, Faculty of Pharmacy, Mansoura University, 35516, Egypt
| | - Masoomeh Tehranirokh
- ARC Training Centre for Portable Analytical Separation Technologies (ASTech), Australia; Trajan Scientific and Medical, Ringwood, VIC, 3134, Australia
| | - Andrew A Gooley
- ARC Training Centre for Portable Analytical Separation Technologies (ASTech), Australia; Trajan Scientific and Medical, Ringwood, VIC, 3134, Australia
| | - Rosanne M Guijt
- ARC Training Centre for Portable Analytical Separation Technologies (ASTech), Australia; Centre for Regional and Rural Futures, Deakin University, Geelong, VIC, 3220, Australia
| | - Michael C Breadmore
- ARC Training Centre for Portable Analytical Separation Technologies (ASTech), Australia; Australian Centre for Research on Separation Science (ACROSS), School of Natural Sciences (Chemistry), University of Tasmania, Private Bag 75, Hobart, Tasmania 7001, Australia.
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Lepowsky E, Ghaderinezhad F, Knowlton S, Tasoglu S. Paper-based assays for urine analysis. BIOMICROFLUIDICS 2017; 11:051501. [PMID: 29104709 PMCID: PMC5645195 DOI: 10.1063/1.4996768] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 09/29/2017] [Indexed: 05/18/2023]
Abstract
A transformation of the healthcare industry is necessary and imminent: hospital-centered, reactive care will soon give way to proactive, person-centered care which focuses on individuals' well-being. However, this transition will only be made possible through scientific innovation. Next-generation technologies will be the key to developing affordable and accessible care, while also lowering the costs of healthcare. A promising solution to this challenge is low-cost continuous health monitoring; this approach allows for effective screening, analysis, and diagnosis and facilitates proactive medical intervention. Urine has great promise for being a key resource for health monitoring; unlike blood, it can be collected effortlessly on a daily basis without pain or the need for special equipment. Unfortunately, the commercial rapid urine analysis tests that exist today can only go so far-this is where the promise of microfluidic devices lies. Microfluidic devices have a proven record of being effective analytical devices, capable of controlling the flow of fluid samples, containing reaction and detection zones, and displaying results, all within a compact footprint. Moving past traditional glass- and polymer-based microfluidics, paper-based microfluidic devices possess the same diagnostic ability, with the added benefits of facile manufacturing, low-cost implementation, and disposability. Hence, we review the recent progress in the application of paper-based microfluidics to urine analysis as a solution to providing continuous health monitoring for proactive care. First, we present important considerations for point-of-care diagnostic devices. We then discuss what urine is and how paper functions as the substrate for urine analysis. Next, we cover the current commercial rapid tests that exist and thereby demonstrate where paper-based microfluidic urine analysis devices may fit into the commercial market in the future. Afterward, we discuss various fabrication techniques that have been recently developed for paper-based microfluidic devices. Transitioning from fabrication to implementation, we present some of the clinically implemented urine assays and their importance in healthcare and clinical diagnosis, with a focus on paper-based microfluidic assays. We then conclude by providing an overview of select biomarker research tailored towards urine diagnostics. This review will demonstrate the applicability of paper-based assays for urine analysis and where they may fit into the commercial healthcare market.
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Affiliation(s)
- Eric Lepowsky
- Department of Mechanical Engineering, University of Connecticut, Storrs, Connecticut 06269, USA
| | - Fariba Ghaderinezhad
- Department of Mechanical Engineering, University of Connecticut, Storrs, Connecticut 06269, USA
| | - Stephanie Knowlton
- Department of Biomedical Engineering, University of Connecticut, Storrs, Connecticut 06269, USA
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Solid supports for extraction and preconcentration of proteins and peptides in microfluidic devices: A review. Anal Chim Acta 2016; 955:1-26. [PMID: 28088276 DOI: 10.1016/j.aca.2016.12.017] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2016] [Revised: 12/02/2016] [Accepted: 12/07/2016] [Indexed: 01/08/2023]
Abstract
Determination of proteins and peptides is among the main challenges of today's bioanalytical chemistry. The application of microchip technology in this field is an exhaustively developed concept that aims to create integrated and fully automated analytical devices able to quantify or detect one or several proteins from a complex matrix. Selective extraction and preconcentration of targeted proteins and peptides especially from biological fluids is of the highest importance for a successful realization of these microsystems. Incorporation of solid structures or supports is a convenient solution employed to face these demands. This review presents a critical view on the latest achievements in sample processing techniques for protein determination using solid supports in microfluidics. The study covers the period from 2006 to 2015 and focuses mainly on the strategies based on microbeads, monolithic materials and membranes. Less common approaches are also briefly discussed. The reviewed literature suggests future trends which are discussed in the concluding remarks.
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Feng X, Liu BF, Li J, Liu X. Advances in coupling microfluidic chips to mass spectrometry. MASS SPECTROMETRY REVIEWS 2015; 34:535-57. [PMID: 24399782 DOI: 10.1002/mas.21417] [Citation(s) in RCA: 87] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Revised: 11/07/2013] [Accepted: 11/07/2013] [Indexed: 05/26/2023]
Abstract
Microfluidic technology has shown advantages of low sample consumption, reduced analysis time, high throughput, and potential for integration and automation. Coupling microfluidic chips to mass spectrometry (Chip-MS) can greatly improve the overall analytical performance of MS-based approaches and expand their potential applications. In this article, we review the advances of Chip-MS in the past decade, covering innovations in microchip fabrication, microchips coupled to electrospray ionization (ESI)-MS and matrix-assisted laser desorption/ionization (MALDI)-MS. Development of integrated microfluidic systems for automated MS analysis will be further documented, as well as recent applications of Chip-MS in proteomics, metabolomics, cell analysis, and clinical diagnosis.
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MESH Headings
- Animals
- Chromatography, Liquid/instrumentation
- Chromatography, Liquid/methods
- Electrophoresis, Microchip/instrumentation
- Electrophoresis, Microchip/methods
- Equipment Design
- Humans
- Lab-On-A-Chip Devices
- Lipids/analysis
- Metabolomics/instrumentation
- Metabolomics/methods
- Polysaccharides/analysis
- Proteins/analysis
- Proteomics/instrumentation
- Proteomics/methods
- Spectrometry, Mass, Electrospray Ionization/instrumentation
- Spectrometry, Mass, Electrospray Ionization/methods
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization/instrumentation
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization/methods
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Affiliation(s)
- Xiaojun Feng
- Britton Chance Center for Biomedical Photonics at Wuhan National Laboratory for Optoelectronics-Hubei Bioinformatics and Molecular Imaging Key Laboratory, Systems Biology Theme, Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Bi-Feng Liu
- Britton Chance Center for Biomedical Photonics at Wuhan National Laboratory for Optoelectronics-Hubei Bioinformatics and Molecular Imaging Key Laboratory, Systems Biology Theme, Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Jianjun Li
- Human Health Therapeutics, National Research Council Canada, Ottawa, Ontario, Canada K1A 0R6
| | - Xin Liu
- Britton Chance Center for Biomedical Photonics at Wuhan National Laboratory for Optoelectronics-Hubei Bioinformatics and Molecular Imaging Key Laboratory, Systems Biology Theme, Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, China
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Abstract
Fast and reliable diagnoses are invaluable in clinical care. Samples (e.g., blood, urine, and saliva) are collected and analyzed for various biomarkers to quickly and sensitively assess disease progression, monitor response to treatment, and determine a patient's prognosis. Processing conventional samples entails many manual time-consuming steps. Consequently, clinical specimens must be processed by skilled technicians before antigens or nucleic acids are detected, and these are often present at dilute concentrations. Recently, several automated microchip technologies have been developed that potentially offer many advantages over traditional bench-top extraction methods. The smaller length scales and more refined transport mechanisms that characterize these microfluidic devices enable faster and more efficient biomarker enrichment and extraction. Additionally, they can be designed to perform multiple tests or experimental steps on one integrated, automated platform. This review explores the current research on microfluidic methods of sample preparation that are designed to aid diagnosis, and covers a broad spectrum of extraction techniques and designs for various types of samples and analytes.
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Affiliation(s)
- Francis Cui
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island 02912;
| | - Minsoung Rhee
- Sandia National Laboratories, Livermore, California 94551-0969
| | - Anup Singh
- Sandia National Laboratories, Livermore, California 94551-0969
| | - Anubhav Tripathi
- Center for Biomedical Engineering, School of Engineering, Brown University, Providence, Rhode Island 02912;
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Mao P, Wang D. Biomonitoring of perfluorinated compounds in a drop of blood. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:6808-6814. [PMID: 25997583 PMCID: PMC4456762 DOI: 10.1021/acs.est.5b01442] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2015] [Revised: 05/03/2015] [Accepted: 05/08/2015] [Indexed: 05/28/2023]
Abstract
Biomonitoring of pollutants and their metabolites and derivatives using biofluids provides new opportunities for spatiotemporal assessment of human risks to environmental exposures. Perfluorinated compounds (PFCs) have been used widely in industry and pose significant environmental concerns due to their stability and bioaccumulation in humans and animals. However, current methods for extraction and measurement of PFCs require relatively large volumes (over one hundred microliters) of blood samples, and therefore, are not suitable for frequent blood sampling and longitudinal biomonitoring of PFCs. We have developed a new microassay, enabled by our silicon microfluidic chip platform, for analyzing PFCs in small volumes (less than five microliters) of blood. Our assay integrates on-chip solid-phase extraction (SPE) with online nanoflow liquid chromatography-electrospray ionization-mass spectrometry (nanoLC-ESI-MS) detection. We demonstrated high sample recovery, excellent interday and intraday accuracy and precision, and a limit of detection down to 50 femtogram of PFCs, in one microliter of human plasma. We validated our assay performance using pooled human plasma and NIST SRM 1950 samples. Our microfluidic chip-based assay may enable frequent longitudinal biomonitoring of PFCs and other environmental toxins using a finger prick of blood, thereby providing new insights into their bioaccumulation, bioavailability, and toxicity.
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Hendrickx S, de Malsche W, Cabooter D. An overview of the use of microchips in electrophoretic separation techniques: fabrication, separation modes, sample preparation opportunities, and on-chip detection. Methods Mol Biol 2015; 1274:3-17. [PMID: 25673478 DOI: 10.1007/978-1-4939-2353-3_1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This chapter is intended as a basic introduction to microchip-based capillary electrophoresis to set the scene for newcomers and give pointers to reference material. An outline of some commonly used setups and key concepts is given, many of which are explored in greater depth in later chapters.
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Affiliation(s)
- Stijn Hendrickx
- Department of Pharmaceutical and Pharmacological Sciences, Pharmaceutical Analysis, KU Leuven, O&N2 923, Herestraat 49, 3000, Leuven, Belgium
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He X, Chen Q, Zhang Y, Lin JM. Recent advances in microchip-mass spectrometry for biological analysis. Trends Analyt Chem 2014. [DOI: 10.1016/j.trac.2013.09.013] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hua Y, Jemere AB, Dragoljic J, Harrison DJ. Multiplexed electrokinetic sample fractionation, preconcentration and elution for proteomics. LAB ON A CHIP 2013; 13:2651-9. [PMID: 23712291 DOI: 10.1039/c3lc50401h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Both 6 and 8-channel integrated microfluidic sample pretreatment devices capable of performing "in space" sample fractionation, collection, preconcentration and elution of captured analytes via sheath flow assisted electrokinetic pumping are described. Coatings and monolithic polymer beds were developed for the glass devices to provide cationic surface charge and anodal electroosmotic flow for delivery to an electrospray emitter tip. A mixed cationic ([2-(methacryloyloxy)ethyl] trimethylammonium chloride) (META) and hydrophobic butyl methacrylate-based monolithic porous polymer, photopolymerized in the 6- or 8-fractionation channels, was used to capture and preconcentrate samples. A 0.45 wt% META loaded bed generated comparable anodic electroosmotic flow to the cationic polymer PolyE-323 coated channel segments in the device. The balanced electroosmotic flow allowed stable electrokinetic sheath flow to prevent cross contamination of separated protein fractions, while reducing protein/peptide adsorption on the channel walls. Sequential elution of analytes trapped in the SPE beds revealed that the monolithic columns could be efficiently used to provide sheath flow during elution of analytes, as demonstrated for neutral carboxy SNARF (residual signal, 0.08% RSD, n = 40) and charged fluorescein (residual signal, 2.5% n = 40). Elution from monolithic columns showed reproducible performance with peak area reproducibility of ~8% (n = 6 columns) in a single sequential elution and the run-to-run reproducibility was 2.4-6.7% RSD (n = 4) for elution from the same bed. The demonstrated ability of this device design and operation to elute from multiple fractionation beds into a single exit channel for sample analysis by fluorescence or electrospray mass spectrometry is a crucial component of an integrated fractionation and assay system for proteomics.
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Affiliation(s)
- Yujuan Hua
- Department of Chemistry, University of Alberta, Edmonton, AB, Canada T6G 2G2
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Gasilova N, Qiao L, Momotenko D, Pourhaghighi MR, Girault HH. Microchip emitter for solid-phase extraction-gradient elution-mass spectrometry. Anal Chem 2013; 85:6254-63. [PMID: 23730778 DOI: 10.1021/ac400171e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A microchip electrospray emitter with a magnetic bead trap has been designed for solid-phase extraction-gradient elution-mass spectrometry (SPE-GEMS). The goal of this method is the detection of analytes at low concentrations and it is here demonstrated using reverse phase coated magnetic beads (Mbs) for the preconcentration and detection of the peptides. The sample is passed through the chip, and the peptides are retained and enriched in the trap. After washing, the peptides are released sequentially by stepwise gradient elution and electrosprayed for mass spectrometry analysis. This approach allows effective sample desalting, enrichment, sequential elution, and MS detection without the introduction of an additional separation step after SPE. Efficient preconcentration of model peptides by SPE and sequential release and analysis of peptides by GEMS were demonstrated for diluted sample solutions within the range of 1 μM to 10 nM. Fortified human blood serum, protein digest and fractions collected after protein digest OFFGEL separation were analyzed by SPE-GEMS allowing the detection of low abundance peptides usually not observed by direct mass spectrometry analysis. A mathematical model for gradient elution is proposed.
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Affiliation(s)
- Natalia Gasilova
- Laboratoire d'Electrochimie Physique et Analytique, Ecole Polytechnique Fédérale de Lausanne, Station 6, CH-1015 Lausanne, Switzerland
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Nge PN, Pagaduan JV, Yu M, Woolley AT. Microfluidic chips with reversed-phase monoliths for solid phase extraction and on-chip labeling. J Chromatogr A 2012; 1261:129-35. [PMID: 22995197 PMCID: PMC3463737 DOI: 10.1016/j.chroma.2012.08.095] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Revised: 08/28/2012] [Accepted: 08/29/2012] [Indexed: 01/13/2023]
Abstract
The integration of sample preparation methods into microfluidic devices provides automation necessary for achieving complete micro total analysis systems. We have developed a technique that combines on-chip sample enrichment with fluorescence labeling and purification. Polymer monoliths made from butyl methacrylate were fabricated in cyclic olefin copolymer microdevices and used for solid phase extraction. We studied the retention of fluorophores, amino acids and proteins on these columns. The retained samples were subsequently labeled with both Alexa Fluor 488 and Chromeo P503, and unreacted dye was rinsed off the column before sample elution. Additional purification was obtained from the differential retention of proteins and fluorescent labels. A linear relation between the eluted peak areas and concentrations of on-chip labeled heat shock protein 90 samples demonstrated the utility of this method for on-chip quantitation. Our fast and simple method of simultaneously concentrating and labeling samples on-chip is compatible with miniaturization and desirable for automated analysis.
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Affiliation(s)
- Pamela N. Nge
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602
| | - Jayson V. Pagaduan
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602
| | - Ming Yu
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602
| | - Adam T. Woolley
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602
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A microfluidic photolithography for controlled encapsulation of single cells inside hydrogel microstructures. Sci China Chem 2012. [DOI: 10.1007/s11426-012-4538-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Xu H, Yan Z, Song D. Development of a novel monolith frit-based solid-phase microextraction method for determination of hexanal and heptanal in human serum samples. J Sep Sci 2012; 35:713-20. [DOI: 10.1002/jssc.201100908] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Revised: 11/30/2011] [Accepted: 12/01/2011] [Indexed: 11/12/2022]
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Abstract
This paper provides a review of novel strategies for sample preparation in forensic toxicology. The review initially outlines the principle of each technique, followed by sections addressing each class of abused drugs separately. The novel strategies currently reviewed focus on the preparation of various biological samples for the subsequent determination of opiates, benzodiazepines, amphetamines, cocaine, hallucinogens, tricyclic antidepressants, antipsychotics and cannabinoids. According to our experience, these analytes are the most frequently responsible for intoxications in Greece. The applications of techniques such as disposable pipette extraction, microextraction by packed sorbent, matrix solid-phase dispersion, solid-phase microextraction, polymer monolith microextraction, stir bar sorptive extraction and others, which are rapidly gaining acceptance in the field of toxicology, are currently reviewed.
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Kuo JS, Chiu DT. Disposable microfluidic substrates: transitioning from the research laboratory into the clinic. LAB ON A CHIP 2011; 11:2656-65. [PMID: 21727966 DOI: 10.1039/c1lc20125e] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
As more microfluidic applications emerge for clinical diagnostics, the choice of substrate and production method must be considered for eventual regulatory approval. In this review, we survey recent developments in disposable microfluidic substrates and their fabrication methods. We note regulatory approval for disposable microfluidic substrates will be more forthcoming if the substrates are developed with the United States Pharmacopeia's biocompatibility compliance guidelines in mind. We also review the recent trend in microfluidic devices constructed from a hybrid of substrates that takes advantage of each material's attributes.
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Affiliation(s)
- Jason S Kuo
- Department of Chemistry, University of Washington, Seattle, WA 98195-1700, USA
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Nguyen TH, Pei R, Stojanovic M, Lin Q. Demonstration and Characterization of Biomolecular Enrichment on Microfluidic Aptamer-Functionalized Surfaces. SENSORS AND ACTUATORS. B, CHEMICAL 2011; 155:58-66. [PMID: 21765612 PMCID: PMC3135969 DOI: 10.1016/j.snb.2010.11.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
This paper demonstrates and systematically characterizes the enrichment of biomolecular compounds using aptamer-functionalized surfaces within a microfluidic device. The device consists of a microchamber packed with aptamer-functionalized microbeads and integrated with a microheater and temperature sensor to enable thermally controlled binding and release of biomolecules by the aptamer. We first present an equilibrium binding-based analytical model to understand the enrichment process. The characteristics of the aptamer-analyte binding and enrichment are then experimentally studied, using adenosine monophosphate (AMP) and a specific RNA aptamer as a model system. The temporal process of AMP binding to the aptamer is found to be primarily determined by the aptamer-AMP binding kinetics. The temporal process of aptamer-AMP dissociation at varying temperatures is also obtained and observed to occur relatively rapidly (< 2 s). The specificity of the enrichment is next confirmed by performing selective enrichment of AMP from a sample containing biomolecular impurities. Finally, we investigate the enrichment of AMP by either discrete or continuous introduction of a dilute sample into the microchamber, demonstrating enrichment factors ranging from 566 to 686×, which agree with predictions of the analytical model.
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Affiliation(s)
- Thai Huu Nguyen
- Department of Mechanical Engineering, Columbia University, New York, NY 10027
| | - Renjun Pei
- Division of Clinical Pharmacology and Experimental Therapeutics, Department of Medicine, Columbia University, New York, NY 10032
| | - Milan Stojanovic
- Division of Clinical Pharmacology and Experimental Therapeutics, Department of Medicine, Columbia University, New York, NY 10032
| | - Qiao Lin
- Department of Mechanical Engineering, Columbia University, New York, NY 10027
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On-chip solid phase extraction and enzyme digestion using cationic PolyE-323 coatings and porous polymer monoliths coupled to electrospray mass spectrometry. J Chromatogr A 2011; 1218:4039-44. [DOI: 10.1016/j.chroma.2011.04.027] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Revised: 04/10/2011] [Accepted: 04/11/2011] [Indexed: 11/19/2022]
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Lin CC, Tseng CC, Chuang TK, Lee DS, Lee GB. Urine analysis in microfluidic devices. Analyst 2011; 136:2669-88. [PMID: 21617803 DOI: 10.1039/c1an15029d] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Microfluidics has attracted considerable attention since its early development in the 1980s and has experienced rapid growth in the past three decades due to advantages associated with miniaturization, integration and automation. Urine analysis is a common, fast and inexpensive clinical diagnostic tool in health care. In this article, we will be reviewing recent works starting from 2005 to the present for urine analysis using microfluidic devices or systems and to provide in-depth commentary about these techniques. Moreover, commercial strips that are often treated as chips and their readers for urine analysis will also be briefly discussed. We start with an introduction to the physiological significance of various components or measurement standards in urine analysis, followed by a brief introduction to enabling microfluidic technologies. Then, microfluidic devices or systems for sample pretreatments and for sensing urinary macromolecules, micromolecules, as well as multiplexed analysis are reviewed, in this sequence. Moreover, a microfluidic chip for urinary proteome profiling is also discussed, followed by a section discussing commercial products. Finally, the authors' perspectives on microfluidic-based urine analysis are provided. These advancements in microfluidic techniques for urine analysis may improve current routine clinical practices, particularly for point-of-care (POC) applications.
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Affiliation(s)
- Chun-Che Lin
- Department of Engineering Science, National Cheng Kung University, Tainan, Taiwan
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Namera A, Nakamoto A, Saito T, Miyazaki S. Monolith as a new sample preparation material: Recent devices and applications. J Sep Sci 2011; 34:901-24. [DOI: 10.1002/jssc.201000795] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Revised: 01/12/2011] [Accepted: 01/15/2011] [Indexed: 11/07/2022]
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Cakal C, Ferrance JP, Landers JP, Caglar P. Microchip extraction of catecholamines using a boronic acid functional affinity monolith. Anal Chim Acta 2011; 690:94-100. [DOI: 10.1016/j.aca.2011.02.009] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2010] [Revised: 01/29/2011] [Accepted: 02/02/2011] [Indexed: 11/24/2022]
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New method for microextraction of ultra trace quantities of gold in real samples using ultrasound-assisted emulsification of solidified floating organic drops. Mikrochim Acta 2011. [DOI: 10.1007/s00604-011-0553-z] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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KATAOKA H. Current Developments and Future Trends in Solid-phase Microextraction Techniques for Pharmaceutical and Biomedical Analyses. ANAL SCI 2011; 27:893-905. [DOI: 10.2116/analsci.27.893] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Lin L, Chen H, Wei H, Wang F, Lin JM. On-chip sample pretreatment using a porous polymer monolithic column for solid-phase microextraction and chemiluminescence determination of catechins in green tea. Analyst 2011; 136:4260-7. [DOI: 10.1039/c1an15530j] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Amin AS. Utility of solid phase extraction for spectrophotometric determination of gold in water, jewel and ore samples. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2010; 77:1054-1058. [PMID: 20884285 DOI: 10.1016/j.saa.2010.08.072] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 08/05/2010] [Accepted: 08/26/2010] [Indexed: 05/29/2023]
Abstract
A highly sensitive, selective and rapid method for the determination μg L(-1) level of Au(III) based on the rapid reaction of Au(III) with 2,3-dichloro-6-(3-carboxy-2-hydroxy-1-naphthylazo)quinoxaline (DCHNAQ) and the solid phase extraction of the colored complex with a reversed phase polymer-based C18 cartridge have been developed. The DCHNAQ reacted with Au(III) to form a violet complex of a molar ratio 3:1 [DCHNAQ to Au(III)] in the presence of 5.0 M of phosphoric acid solution and Triton X-100 medium. This complex was enriched by the solid phase extraction with a polymer-based C18 cartridge. The enrichment factor of 100 was achieved. The molar absorptivity of the complex is 2.73×10(5) l mol(-1) cm(-1) at 633 nm in the measured solution. The system obeys Beer's law in the range of 0.02-1.30 μg ml(-1), whereas the optimum concentration ranges obtained from Ringbom plot was 0.08-1.24 μg ml(-1). The relative standard deviation for ten replicates sample of 0.6 μg ml(-1) level is 1.28%. The detection and quantification limits, are 6.1 and 19.5 ng ml(-1) in the original sample. This method was applied to the determination of gold in water, jewel and ore samples with good results comparing to the GFAAS method.
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Affiliation(s)
- Alaa S Amin
- Chemistry Department, Faculty of Science, Benha University, Benha, Egypt.
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27
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Porous monoliths: sorbents for miniaturized extraction in biological analysis. Anal Bioanal Chem 2010; 399:3345-57. [DOI: 10.1007/s00216-010-4190-x] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Revised: 09/01/2010] [Accepted: 09/01/2010] [Indexed: 10/19/2022]
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28
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Cakal C, Ferrance JP, Landers JP, Caglar P. Development of a micro-total analysis system (μ-TAS) for the determination of catecholamines. Anal Bioanal Chem 2010; 398:1909-17. [DOI: 10.1007/s00216-010-3998-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2010] [Revised: 06/28/2010] [Accepted: 07/01/2010] [Indexed: 11/28/2022]
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Gao D, Wei H, Guo GS, Lin JM. Microfluidic Cell Culture and Metabolism Detection with Electrospray Ionization Quadrupole Time-of-Flight Mass Spectrometer. Anal Chem 2010; 82:5679-85. [DOI: 10.1021/ac101370p] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Dan Gao
- The Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China, and State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Huibin Wei
- The Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China, and State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Guang-Sheng Guo
- The Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China, and State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Jin-Ming Lin
- The Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China, and State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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Vázquez M, Paull B. Review on recent and advanced applications of monoliths and related porous polymer gels in micro-fluidic devices. Anal Chim Acta 2010; 668:100-13. [DOI: 10.1016/j.aca.2010.04.033] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2010] [Revised: 04/15/2010] [Accepted: 04/16/2010] [Indexed: 10/19/2022]
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31
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On-chip coupling of electrochemical pumps and an SU-8 tip for electrospray ionization mass spectrometry. Biomed Microdevices 2009; 10:891-897. [PMID: 18563570 DOI: 10.1007/s10544-008-9203-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
We present the integration of a cyclo olefin copolymer microfluidic chip with electrochemical pumps and an SU-8 tip for electrospray ionization mass spectrometry. The electrochemical pump, using electrolysis as an internal pressure source, was fabricated directly on the surface of the polymer chip. The triangular SU-8 emitter tip was fabricated on a glass wafer using standard photolithography. After release from the glass wafer, this tip was aligned to the microchannel and bonded between two polymer plates. The electrochemical pump and the electrospray tip were tested with electrospray ionization mass spectrometry. Mass spectrometry confirmed the stability of the electrochemical pump and the electrospray tip.
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32
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Iannacone JM, Ren S, Hatcher NG, Sweedler JV. Collecting peptide release from the brain using porous polymer monolith-based solid phase extraction capillaries. Anal Chem 2009; 81:5433-8. [PMID: 19485405 PMCID: PMC2810310 DOI: 10.1021/ac9005843] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Porous polymer monolithic (PPM) columns are employed to collect and concentrate neuronal release from invertebrate and vertebrate model systems, prior to their characterization with mass spectrometry. The monoliths are fabricated in fused-silica capillaries from lauryl methacrylate (LMA) and ethylene glycol dimethacrylate (EDMA). The binding capacities for fluorescein and for fluorescently labeled peptides are on the order of nanomoles per millimeter of length of monolith material for a capillary with an inner diameter of 200 microm. To evaluate this strategy for collecting peptides from physiological solutions, angiotensin I and insulin in artificial seawater are loaded onto, and then released from, the monoliths after a desalination rinse, resulting in femtomole limits of detection via matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Positioned in the extracellular media near Aplysia californica bag cell neurons, upon electrical stimulation, these LMA-EDMA monoliths are also used to collect and concentrate peptide release, with egg-laying hormones and acidic peptide detected. In addition, the collection of several known peptides secreted from chemically stimulated mouse brain slices demonstrates their ability to collect releasates from a variety of neuronal tissues. When compared to collection approaches using individual beads placed on brain slices, the PPM capillaries offer greater binding capacity. Moreover, they maintain higher spatial resolution, compared to the larger-volume, solid-phase extraction collection strategies.
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Affiliation(s)
- Jamie M. Iannacone
- Department of Chemistry and the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Shifang Ren
- Department of Chemistry and the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Nathan G. Hatcher
- Department of Chemistry and the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
| | - Jonathan V. Sweedler
- Department of Chemistry and the Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
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Lee J, Soper SA, Murray KK. Microfluidic chips for mass spectrometry-based proteomics. JOURNAL OF MASS SPECTROMETRY : JMS 2009; 44:579-93. [PMID: 19373851 DOI: 10.1002/jms.1585] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Microfluidic devices coupled to mass spectrometers have emerged as excellent tools for solving the complex analytical challenges associated with the field of proteomics. Current proteome identification procedures are accomplished through a series of steps that require many hours of labor-intensive work. Microfluidics can play an important role in proteomic sample preparation steps prior to mass spectral identification such as sample cleanup, digestion, and separations due to its ability to handle small sample quantities with the potential for high-throughput parallel analysis. To utilize microfluidic devices for proteomic analysis, an efficient interface between the microchip and the mass spectrometer is required. This tutorial provides an overview of the technologies and applications of microfluidic chips coupled to mass spectrometry for proteome analysis. Various approaches for combining microfluidic devices with electrospray ionization (ESI) and matrix-assisted laser desorption/ionization (MALDI) are summarized and applications of chip-based separations and digestion technologies to proteomic analysis are presented.
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Affiliation(s)
- Jeonghoon Lee
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA
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34
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Mair DA, Schwei TR, Dinio TS, Fréchet JMJ, Svec F. Use of photopatterned porous polymer monoliths as passive micromixers to enhance mixing efficiency for on-chip labeling reactions. LAB ON A CHIP 2009; 9:877-83. [PMID: 19294297 PMCID: PMC2790067 DOI: 10.1039/b816521a] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
We introduce a passive micromixer with novel architecture using photopatterned porous polymer monoliths (PPM) and demonstrate an improvement in mixing efficiency by monitoring the fluorescence of an on-chip labeling reaction. UV light was used to photopattern a periodic arrangement of PPM structures directly within the channel of a plastic microfluidic chip. By optimizing the composition of the polymerization solution and irradiation time we demonstrate the ability to photopattern PPM in regularly repeating 100 microm segments at the tee-junction of the disposable device. To evaluate the efficiency of this dual functional mixer-reactor fluorescamine and lysine were introduced in separate channels upstream of the tee-junction and the intensity of laser-induced fluorescence resulting from the fluorogenic labeling reaction was monitored. The fluorescence level after the photopatterned periodic monolith configuration was 22% greater than both an equivalent 1 cm continuous segment of PPM and an open channel. Results indicate that this periodic arrangement of PPM, with regularly spaced open areas between 100 microm plugs of PPM, is directly responsible for enhancing the mixing and overall rate of chemical reaction in the system. In addition to facilitating preparation of a dual functional mixer-reactor, the ability to accurately photopattern PPM is an enabling technology for seamlessly integrating multiple monoliths into a single device. This technology will be particularly important to proteomic applications requiring preconcentration, enzymatic digestion and two-dimensional separations.
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Affiliation(s)
| | - Thomas R. Schwei
- College of Chemistry, University of California, Berkeley, CA 94720, USA
| | - Theresa S. Dinio
- College of Chemistry, University of California, Berkeley, CA 94720, USA
| | - Jean M. J. Fréchet
- College of Chemistry, University of California, Berkeley, CA 94720, USA
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley CA, USA. Fax: +1 510 486 7419; Tel. +1 510 486 7964; E-mail:
| | - Frantisek Svec
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley CA, USA. Fax: +1 510 486 7419; Tel. +1 510 486 7964; E-mail:
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35
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Faure K, Albert M, Dugas V, Crétier G, Ferrigno R, Morin P, Rocca JL. Development of an acrylate monolith in a cyclo-olefin copolymer microfluidic device for chip electrochromatography separation. Electrophoresis 2009; 29:4948-55. [PMID: 19130574 DOI: 10.1002/elps.200800235] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An acrylate monolith has been synthesized into a cyclic olefin copolymer microdevice for reversed-phase electrochromatography purposes. Microchannels, designed by hot embossing, were filled up with an acrylate monolith to serve as a hydrophobic stationary phase. A lauryl acrylate monolith was formulated to suit the hydrophobic material, by implementing 100% organic porogenic solvent. This new composition was tested in capillary prior to its transfer into the microfluidic device. Surface functionalization of the cyclic olefin copolymer surface was applied using UV-grafting technique to improve the covalent attachment of this monolith to the plastic walls of the microfluidic chip. The on-chip performances of this monolith were evaluated in detail for the reversed-phase electrochromatographic separation of polycyclic aromatic hydrocarbons, with plate heights reaching down to 10 microm when working at optimal velocity.
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Affiliation(s)
- Karine Faure
- Laboratoire des Sciences Analytiques, Université de Lyon, Villeurbanne, France.
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36
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37
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Sueyoshi K, Kitagawa F, Otsuka K. Recent progress of online sample preconcentration techniques in microchip electrophoresis. J Sep Sci 2008; 31:2650-66. [PMID: 18693308 DOI: 10.1002/jssc.200800272] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Microchip electrophoresis (MCE) has been advanced remarkably by the applications of several separation modes and the integration with several chemical operations on a single planer substrate. MCE shows superior analytical performance, e.g., high-speed analysis, high resolution, low consumption of reagents, and so on, whereas low-concentration sensitivity is still one of the major problems. To overcome this drawback, various online sample preconcentration techniques have been developed in MCE over the past 15 years, which have successfully enhanced the detection sensitivity in MCE. This review highlights recent developments in online sample preconcentration in MCE categorized on the basis of "dynamic" and "static" methods. The dynamic techniques including field amplified stacking, ITP, sweeping, and focusing have been easily applied to MCE, which provide effective enrichments of various analytes. The static techniques such as SPE and filtration have also been combined with MCE. In the static techniques, extremely high preconcentration efficiency can be obtained, compared to the dynamic methods. This review provides comprehensive tables listing the applications and sensitivity enhancement factors of these preconcentration techniques employed in MCE.
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Affiliation(s)
- Kenji Sueyoshi
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto, Japan.
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38
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Huh YS, Park TJ, Yang K, Lee EZ, Hong YK, Lee SY, Kim DH, Hong WH. Advanced cleanup process of the free-flow microfluidic device for protein analysis. Ultramicroscopy 2008; 108:1365-70. [DOI: 10.1016/j.ultramic.2008.04.085] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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39
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Rabe KS, Gandubert VJ, Spengler M, Erkelenz M, Niemeyer CM. Engineering and assaying of cytochrome P450 biocatalysts. Anal Bioanal Chem 2008; 392:1059-73. [PMID: 18622752 DOI: 10.1007/s00216-008-2248-9] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2008] [Revised: 06/11/2008] [Accepted: 06/12/2008] [Indexed: 11/29/2022]
Abstract
Cytochrome P450s constitute a highly fascinating superfamily of enzymes which catalyze a broad range of reactions. They are essential for drug metabolism and promise industrial applications in biotechnology and biosensing. The constant search for cytochrome P450 enzymes with enhanced catalytic performances has generated a large body of research. This review will concentrate on two key aspects related to the identification and improvement of cytochrome P450 biocatalysts, namely the engineering and assaying of these enzymes. To this end, recent advances in cytochrome P450 development are reported and commonly used screening methods are surveyed.
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Affiliation(s)
- Kersten S Rabe
- Fakultät für Chemie, Biologisch-Chemische Mikrostrukturtechnik, Technische Universität Dortmund, Otto-Hahn-Strabetae 6, 44227, Dortmund, Germany
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40
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Potter OG, Hilder EF. Porous polymer monoliths for extraction: Diverse applications and platforms. J Sep Sci 2008; 31:1881-906. [DOI: 10.1002/jssc.200800116] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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41
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Li HF, Liu J, Cai Z, Lin JM. Coupling a microchip with electrospray ionization quadrupole time-of-flight mass spectrometer for peptide separation and identification. Electrophoresis 2008; 29:1889-94. [DOI: 10.1002/elps.200700477] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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42
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Removal of bovine serum albumin using solid-phase extraction with in-situ polymerized stationary phase in a microfluidic device. J Chromatogr A 2008; 1187:11-7. [DOI: 10.1016/j.chroma.2008.01.084] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2007] [Revised: 01/17/2008] [Accepted: 01/28/2008] [Indexed: 11/21/2022]
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43
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Polymer microfabrication technologies for microfluidic systems. Anal Bioanal Chem 2007; 390:89-111. [DOI: 10.1007/s00216-007-1692-2] [Citation(s) in RCA: 467] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2007] [Revised: 10/05/2007] [Accepted: 10/09/2007] [Indexed: 01/11/2023]
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44
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Koster S, Verpoorte E. A decade of microfluidic analysis coupled with electrospray mass spectrometry: an overview. LAB ON A CHIP 2007; 7:1394-1412. [PMID: 17960264 DOI: 10.1039/b709706a] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
This review presents a thorough overview covering the period 1997-2006 of microfluidic chips coupled to mass spectrometry through an electrospray interface. The different types of fabrication processes and materials used to fabricate these chips throughout this period are discussed. Three 'eras' of interfaces are clearly distinguished. The earliest approach involves spraying from the edge of a chip, while later devices either incorporate a standard fused-silica emitter inserted into the device or fully integrated emitters formed during chip fabrication. A summary of microfluidic-electrospray devices for performing separations and sample pretreatment steps before sample introduction into the mass spectrometer is also presented.
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Affiliation(s)
- Sander Koster
- Groningen Research Institute of Pharmacy, University of Groningen, Antonius Deusinglaan 1, 9713AV Groningen, The Netherlands.
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45
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Farag A, Soliman M, Abdel-Rasoul O, El-Shahawi M. Sorption characteristics and chromatographic separation of gold (I and III) from silver and base metal ions using polyurethane foams. Anal Chim Acta 2007; 601:218-29. [DOI: 10.1016/j.aca.2007.08.049] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2007] [Revised: 08/14/2007] [Accepted: 08/15/2007] [Indexed: 11/16/2022]
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46
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Horsman KM, Bienvenue JM, Blasier KR, Landers JP. Forensic DNA Analysis on Microfluidic Devices: A Review. J Forensic Sci 2007; 52:784-99. [PMID: 17553097 DOI: 10.1111/j.1556-4029.2007.00468.x] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The advent of microfluidic technology for genetic analysis has begun to impact forensic science. Recent advances in microfluidic separation of short-tandem-repeat (STR) fragments has provided unprecedented potential for improving speed and efficiency of DNA typing. In addition, the analytical processes associated with sample preparation--which include cell sorting, DNA extraction, DNA quantitation, and DNA amplification--can all be integrated with the STR separation in a seamless manner. The current state of these microfluidic methods as well as their advantages and potential shortcomings are detailed. Recent advances in microfluidic device technology, as they pertain to forensic DNA typing, are discussed with a focus on the forensic community.
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Affiliation(s)
- Katie M Horsman
- Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA
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47
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Fontanals N, Marcé RM, Borrull F. New materials in sorptive extraction techniques for polar compounds. J Chromatogr A 2007; 1152:14-31. [PMID: 17187808 DOI: 10.1016/j.chroma.2006.11.077] [Citation(s) in RCA: 194] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2006] [Revised: 11/17/2006] [Accepted: 11/22/2006] [Indexed: 11/28/2022]
Abstract
This paper provides an overview of the new developments in material and format technology that improve the extraction of polar compounds in several extraction techniques. They mainly include solid-phase extraction, but there are also other sorptive extraction techniques, such as stir bar sorptive extraction and solid-phase microextraction that use either fibers or in-tube devices. We focus on new synthesised materials that are both commercially available and "in-house". Most novel materials that enhance the extraction of polar compounds are hydrophilic and have large specific surface area; however, we also cover other leading technologies, such as sol-gel or monolith. We describe the morphological and chemical properties of these new sorbents so that we can better understand them and relate them to their capability of retaining polar compounds. We discuss the extraction efficiency for polar compounds when these polymers are used as sorptive material and compare them to other materials. We also mention some representative examples of applications.
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Affiliation(s)
- N Fontanals
- Departament de Química Analítica i Química Orgànica, Universitat Rovira i Virgili, Campus Sescelades, Marcel lí Domingo, s/n, 43007 Tarragona, Spain
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48
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Stachowiak TB, Mair DA, Holden TG, Lee LJ, Svec F, Fréchet JMJ. Hydrophilic surface modification of cyclic olefin copolymer microfluidic chips using sequential photografting. J Sep Sci 2007; 30:1088-93. [PMID: 17566345 DOI: 10.1002/jssc.200600515] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The plastic material known as cyclic olefin copolymer (COC) is a useful substrate material for fabricating microfluidic devices due to its low cost, ease of fabrication, excellent optical properties, and resistance to many solvents. However, the hydrophobicity of native COC limits its use in bioanalytical applications. To increase surface hydrophilicity and reduce protein adsorption, COC surfaces were photografted with poly(ethylene glycol) methacrylate (PEGMA) using a two-step sequential approach: covalently-bound surface initiators were formed in the first step and graft polymerization of PEGMA was then carried out from these sites in the second step. Contact angle measurements were used to monitor and quantify the changes in surface hydrophilicity as a function of grafting conditions. As water droplet contact angles decreased from 88 degrees for native COC to 45 degrees for PEGMA-grafted surfaces, protein adsorption was also reduced by 78% for the PEGMA-modified COC microchannels as determined by a fluorescence assay. This photografting technique should enable the use of COC microdevices in a variety of bioanalytical applications that require minimal nonspecific adsorption of biomolecules.
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Affiliation(s)
- Timothy B Stachowiak
- Department of Chemical Engineering, University of California, Berkeley, CA 94720-1460, USA
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49
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Kustos I, Kocsis B, Kilár F. Bacterial outer membrane protein analysis by electrophoresis and microchip technology. Expert Rev Proteomics 2007; 4:91-106. [PMID: 17288518 DOI: 10.1586/14789450.4.1.91] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Outer membrane proteins are indispensable components of bacterial cells and participate in several relevant functions of the microorganisms. Changes in the outer membrane protein composition might alter antibiotic sensitivity and pathogenicity. Furthermore, the effects of various factors on outer membrane protein expression, such as antibiotic treatment, mutation, changes in the environment, lipopolysaccharide modification and biofilm formation, have been analyzed. Traditionally, the outer membrane protein profile determination was performed by sodium dodecyl sulfate polyacrylamide gel electrophoresis. Converting this technique to capillary electrophoresis format resulted in faster separation, lower sample consumption and automation. Coupling capillary electrophoresis with mass spectrometry enabled the fast identification of bacterial proteins, while immediate quantitative analysis permitted the determination of up- and downregulation of certain outer membrane proteins. Adapting capillary electrophoresis to microchip format ensured a further ten- to 100-fold decrease in separation time. Application of different separation techniques combined with various sensitive detector systems has ensured further opportunities in the field of high-throughput bacterial protein analysis. This review provides an overview using selected examples of outer membrane proteins and the development and application of the electrophoretic and microchip technologies for the analysis of these proteins.
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Affiliation(s)
- Ildikó Kustos
- University of Pécs, Department of Medical Microbiology & Immunology, Faculty of Medicine, Pécs, Hungary.
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50
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Mair DA, Geiger E, Pisano AP, Fréchet JMJ, Svec F. Injection molded microfluidic chips featuring integrated interconnects. LAB ON A CHIP 2006; 6:1346-54. [PMID: 17102848 DOI: 10.1039/b605911b] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
An injection molding process for the fabrication of disposable plastic microfluidic chips with a cycle time of 2 min has been designed, developed, and implemented. Of the sixteen commercially available grades of cyclo-olefin copolymer (COC) that were screened for autofluorescence and transparency to ultraviolet (UV) light, Topas 8007 x 10 was identified as the most suitable for production. A robust solid metal mold insert defining the microfluidic channels was rapidly microfabricated using a process that significantly reduces the time required for electroplating. No wear of the insert was observed even after over 1000 cycles. The chips were bonded by thermal fusion using different bonding conditions. Each condition was tested and its suitability evaluated by burst pressure measurements. The COC microfluidic chips feature novel, integrated, reversible, standardized, ready-to-use interconnects that enable operation at pressures up to 15.6 MPa, the highest value reported to date. The suitability of these UV transparent, high pressure-resistant, disposable devices was demonstrated by in situ preparation of a high surface area porous polymer monolith within the channels.
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Affiliation(s)
- Dieudonne A Mair
- Department of Chemical Engineering, University of California, Berkeley, CA 94720, USA
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