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Hasan MS, Sundberg C, Tolosa M, Andar A, Ge X, Kostov Y, Rao G. A novel, low-cost microfluidic device with an integrated filter for rapid, ultrasensitive, and high-throughput bioburden detection. Sci Rep 2023; 13:12084. [PMID: 37495652 PMCID: PMC10372024 DOI: 10.1038/s41598-023-38770-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Accepted: 07/14/2023] [Indexed: 07/28/2023] Open
Abstract
Rapid and accurate bioburden detection has become increasingly necessary for food, health, pharmaceutical and environmental applications. To detect bioburden accurately, and in a highly sensitive manner, we have fabricated a novel microfluidic device with an integrated filter to trap the cells. Bioburden is detected on the filter paper in situ using the redox reaction of fluorescent label resorufin and a portable multichannel fluorometer is used for fluorescence measurement. The microfluidic device was fabricated in a facile, low-cost, and rapid way with microwave-induced thermally assisted bonding. To characterize the bonding quality of the microfluidic cassettes, different tests were performed, and the filter paper material and size were optimized. Primary Bacillus subtilis culture bacterial samples were filtered through the device to validate and investigate the performance parameters. Our results show that a limit of detection (LOD) of 0.037 CFU/mL can be achieved through this microfluidic device whereas the LOD in a normal microfluidic cassette in the fluorometer and the golden standard spectrophotometer are 0.378 and 0.128 CFU/mL respectively. The results depict that three to ten times LOD improvement is possible through this microfluidic cassette and more sensitive detection is possible depending on the volume filtered within a rapid 3 min. This novel microfluidic device along with the fluorometer can be used as a rapid portable tool for highly sensitive, accurate and high-throughput bacterial detection for different applications.
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Affiliation(s)
- Md Sadique Hasan
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
- Department of Computer Science and Electrical Engineering, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
| | - Chad Sundberg
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
- Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
| | - Michael Tolosa
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
| | - Abhay Andar
- Champions Oncology Inc, 855 N Wolfe St, Baltimore, MD, 21205, USA
| | - Xudong Ge
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
- Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
| | - Yordan Kostov
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, Baltimore, MD, 21250, USA
| | - Govind Rao
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, Baltimore, MD, 21250, USA.
- Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, Baltimore, MD, 21250, USA.
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2
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Hasan MS, Borhani S, Ramamurthy SS, Andar A, Ge X, Choa FS, Kostov Y, Rao G. Microwave induced thermally assisted solvent-based bonding of biodegradable thermoplastics: an eco-friendly rapid approach for fabrication of microfluidic devices and analyte detection. Sci Rep 2022; 12:16075. [PMID: 36167734 PMCID: PMC9515109 DOI: 10.1038/s41598-022-20257-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 09/12/2022] [Indexed: 11/21/2022] Open
Abstract
There is an increasing interest in low-cost, facile and versatile thermoplastic bonding for microfluidic applications that can be easily transitioned from laboratory prototyping to industrial manufacturing. In addition, owing to the surge in the usage of thermoplastic microfluidics and its adverse effect on the environment, it is prudent to source alternative materials that are biodegradable, providing a sustainable, green approach. To address the problems, here we introduce an environment friendly, low-cost and safe welding technology used in the fabrication of microcassettes from biodegradable cellulose acetate (CA) thermoplastics. The thermally assisted solvent based bonding of the thermoplastics was accomplished in a domestic microwave oven with the aid of a polyether ether ketone (PEEK) vise. To characterize the quality of the bonding, our in-house technique was compared with a conventional thermally assisted solvent bonding configuration using a heat press machine and tested under different conditions. Our microwave induced bonding of CA presents three times reduced bonding time with higher bonding strength, good reliability and does not necessitate the use of cumbersome instrumentation. Finally, we demonstrate an electrophoresis application and vitamin C detection accomplished using this biodegradable microcassette presenting comparable results with traditional techniques, illustrating the potential of this fabrication technique in different microfluidic applications.
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Affiliation(s)
- Md Sadique Hasan
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA.,Department of Computer Science and Electrical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA
| | - Shayan Borhani
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA.,Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA
| | - Sai Sathish Ramamurthy
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA.,Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA.,STAR Laboratory, Department of Chemistry, Sri Sathya Sai Institute of Higher Learning, Prasanthi Nilayam, Puttaparthi, Anantapur, Andhra Pradesh, 515134, India
| | - Abhay Andar
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA.,Potomac Photonics Inc., Process and Product Technologies, 1450 South Rolling Road, Baltimore, MA, 21227, USA
| | - Xudong Ge
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA.,Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA
| | - Fow-Sen Choa
- Department of Computer Science and Electrical Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA
| | - Yordan Kostov
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA
| | - Govind Rao
- Center for Advanced Sensor Technology, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA. .,Department of Chemical, Biochemical and Environmental Engineering, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MA, 21250, USA.
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Xie S, Wu J, Tang B, Zhou G, Jin M, Shui L. Large-Area and High-Throughput PDMS Microfluidic Chip Fabrication Assisted by Vacuum Airbag Laminator. Micromachines (Basel) 2017; 8:E218. [PMID: 30400409 PMCID: PMC6190007 DOI: 10.3390/mi8070218] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Revised: 06/23/2017] [Accepted: 06/29/2017] [Indexed: 01/13/2023]
Abstract
One of the key fabrication steps of large-area microfluidic devices is the flexible-to-hard sheet alignment and pre-bonding. In this work, the vacuum airbag laminator (VAL) which is commonly used for liquid crystal display (LCD) production has been applied for large-area microfluidic device fabrication. A straightforward, efficient, and low-cost method has been achieved for 400 × 500 mm² microfluidic device fabrication. VAL provides the advantages of precise alignment and lamination without bubbles. Thermal treatment has been applied to achieve strong PDMS⁻glass and PDMS⁻PDMS bonding with maximum breakup pressure of 739 kPa, which is comparable to interference-assisted thermal bonding method. The fabricated 152 × 152 mm² microfluidic chip has been successfully applied for droplet generation and splitting.
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Affiliation(s)
- Shuting Xie
- Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics & Joint International Research Laboratory of Optical Information of the Chinese Ministry of Education, South China Normal University, Guangzhou 510006, China.
| | - Jun Wu
- Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics & Joint International Research Laboratory of Optical Information of the Chinese Ministry of Education, South China Normal University, Guangzhou 510006, China.
| | - Biao Tang
- Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics & Joint International Research Laboratory of Optical Information of the Chinese Ministry of Education, South China Normal University, Guangzhou 510006, China.
| | - Guofu Zhou
- Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics & Joint International Research Laboratory of Optical Information of the Chinese Ministry of Education, South China Normal University, Guangzhou 510006, China.
| | - Mingliang Jin
- Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics & Joint International Research Laboratory of Optical Information of the Chinese Ministry of Education, South China Normal University, Guangzhou 510006, China.
| | - Lingling Shui
- Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics & Joint International Research Laboratory of Optical Information of the Chinese Ministry of Education, South China Normal University, Guangzhou 510006, China.
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4
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O'Neil CE, Taylor S, Ratnayake K, Pullagurla S, Singh V, Soper SA. Characterization of activated cyclic olefin copolymer: effects of ethylene/norbornene content on the physiochemical properties. Analyst 2016; 141:6521-6532. [PMID: 27827488 PMCID: PMC5354357 DOI: 10.1039/c6an01448h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The ethylene/norbornene content within cyclic olefin copolymer (COC) is well known to affect the chemical and physical properties of the copolymer, such as the glass transition temperature (Tg) and transparency. However, no work has been reported evaluating the effects of the ethylene/norbornene content on the surface properties of COC following UV/O3 or O2 plasma activation. Activation with either O2 plasma or UV/O3 is often used to assist in thermal assembly of fluidic devices, increasing the wettability of the surfaces, or generating functional scaffolds for the attachment of biological elements. Thus, we investigated differences in the physiochemical surface properties of various ethylene/norbornene compositions of COC following activation using analytical techniques such as water contact angle (WCA), ATR-FTIR, XPS, TOF-SIMS, UV-VIS, AFM and a colorimetric assay utilizing Toluidine Blue O (TBO). Results showed that increased norbornene content led to the generation of more oxygen containing functionalities such as alcohols, ketones, aldehydes and carboxyl groups when activated with either UV/O3 or O2 plasma. Specifically, COC with ∼60% norbornene content showed a significantly higher -COOH functional group density when compared to COC with a 50% norbornene content and COC with a 35% norbornene content following UV/O3 or O2 plasma activation. Furthermore, COC with large norbornene contents showed a smaller average RMS roughness (0.65 nm) when compared to COC containing low norbornene contents (0.95 nm) following activation making this substrate especially suited for nanofluidic applications, which require smooth surfaces to minimize effects arising from dielectrophoretic trapping or non-specific adsorption. Although all COC substrates showed >90% transparency at wavelengths >475 nm, COC possessing high norbornene contents showed significantly less transparency at wavelengths below 475 nm following activation, making optical detection in this region difficult. Our data showed distinct physiochemical differences in activated COC that was dependent upon the ethylene/norbornene content of the thermoplastic and thus, careful selection of the particular COC grade must be considered for micro- and nanofluidics.
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Affiliation(s)
- Colleen E O'Neil
- Department of Chemistry, the University of North Carolina at Chapel Hill, NC, USA
| | - Scott Taylor
- Department of Chemistry, the University of North Carolina at Chapel Hill, NC, USA
| | | | - Swathi Pullagurla
- Department of Chemistry, the University of Kansas, Lawrence, KS, USA. and Center for Biomodular Multiscale Systems for Precision Medicine, USA
| | - Varshni Singh
- Department of Biomedical Engineering, UNC, Chapel Hill, NC, USA
| | - Steven A Soper
- Department of Chemistry, the University of Kansas, Lawrence, KS, USA. and Center for Biomodular Multiscale Systems for Precision Medicine, USA and Department of Mechanical Engineering, the University of Kansas, Lawrence, KS, USA and Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
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5
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Kim H, Park N, Hahn JH. Parallel-processing continuous-flow device for optimization-free polymerase chain reaction. Anal Bioanal Chem 2016; 408:6751-8. [DOI: 10.1007/s00216-016-9798-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Revised: 07/10/2016] [Accepted: 07/14/2016] [Indexed: 01/29/2023]
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6
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ONeil CE, Jackson JM, Shim SH, Soper SA. Interrogating Surface Functional Group Heterogeneity of Activated Thermoplastics Using Super-Resolution Fluorescence Microscopy. Anal Chem 2016; 88:3686-96. [PMID: 26927303 DOI: 10.1021/acs.analchem.5b04472] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
We present a novel approach for characterizing surfaces utilizing super-resolution fluorescence microscopy with subdiffraction limit spatial resolution. Thermoplastic surfaces were activated by UV/O3 or O2 plasma treatment under various conditions to generate pendant surface-confined carboxylic acids (-COOH). These surface functional groups were then labeled with a photoswitchable dye and interrogated using single-molecule, localization-based, super-resolution fluorescence microscopy to elucidate the surface heterogeneity of these functional groups across the activated surface. Data indicated nonuniform distributions of these functional groups for both COC and PMMA thermoplastics with the degree of heterogeneity being dose dependent. In addition, COC demonstrated relative higher surface density of functional groups compared to PMMA for both UV/O3 and O2 plasma treatment. The spatial distribution of -COOH groups secured from super-resolution imaging were used to simulate nonuniform patterns of electroosmotic flow in thermoplastic nanochannels. Simulations were compared to single-particle tracking of fluorescent nanoparticles within thermoplastic nanoslits to demonstrate the effects of surface functional group heterogeneity on the electrokinetic transport process.
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Affiliation(s)
| | | | - Sang-Hee Shim
- Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , Ulsan, South Korea
| | - Steven A Soper
- Department of Biomedical Engineering, School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST) , Ulsan, South Korea
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7
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Durney BC, Crihfield CL, Holland LA. Capillary electrophoresis applied to DNA: determining and harnessing sequence and structure to advance bioanalyses (2009-2014). Anal Bioanal Chem 2015; 407:6923-38. [PMID: 25935677 PMCID: PMC4551542 DOI: 10.1007/s00216-015-8703-5] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2015] [Revised: 04/09/2015] [Accepted: 04/13/2015] [Indexed: 12/17/2022]
Abstract
This review of capillary electrophoresis methods for DNA analyses covers critical advances from 2009 to 2014, referencing 184 citations. Separation mechanisms based on free-zone capillary electrophoresis, Ogston sieving, and reptation are described. Two prevalent gel matrices for gel-facilitated sieving, which are linear polyacrylamide and polydimethylacrylamide, are compared in terms of performance, cost, viscosity, and passivation of electroosmotic flow. The role of capillary electrophoresis in the discovery, design, and characterization of DNA aptamers for molecular recognition is discussed. Expanding and emerging techniques in the field are also highlighted.
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Affiliation(s)
- Brandon C Durney
- C. Eugene Bennett Department of Chemistry, West Virginia University, Morgantown, WV, 26506, USA
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8
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Bartsch MS, Edwards HS, Lee D, Moseley CE, Tew KE, Renzi RF, Van de Vreugde JL, Kim H, Knight DL, Sinha A, Branda SS, Patel KD. The rotary zone thermal cycler: a low-power system enabling automated rapid PCR. PLoS One 2015; 10:e0118182. [PMID: 25826708 PMCID: PMC4380418 DOI: 10.1371/journal.pone.0118182] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Accepted: 01/09/2015] [Indexed: 12/17/2022] Open
Abstract
Advances in molecular biology, microfluidics, and laboratory automation continue to expand the accessibility and applicability of these methods beyond the confines of conventional, centralized laboratory facilities and into point of use roles in clinical, military, forensic, and field-deployed applications. As a result, there is a growing need to adapt the unit operations of molecular biology (e.g., aliquoting, centrifuging, mixing, and thermal cycling) to compact, portable, low-power, and automation-ready formats. Here we present one such adaptation, the rotary zone thermal cycler (RZTC), a novel wheel-based device capable of cycling up to four different fixed-temperature blocks into contact with a stationary 4-microliter capillary-bound sample to realize 1-3 second transitions with steady state heater power of less than 10 W. We demonstrate the utility of the RZTC for DNA amplification as part of a highly integrated rotary zone PCR (rzPCR) system that uses low-volume valves and syringe-based fluid handling to automate sample loading and unloading, thermal cycling, and between-run cleaning functionalities in a compact, modular form factor. In addition to characterizing the performance of the RZTC and the efficacy of different online cleaning protocols, we present preliminary results for rapid single-plex PCR, multiplex short tandem repeat (STR) amplification, and second strand cDNA synthesis.
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Affiliation(s)
- Michael S. Bartsch
- Sandia National Laboratories, Livermore, CA, United States of America
- * E-mail:
| | | | - Daniel Lee
- Sandia National Laboratories, Livermore, CA, United States of America
| | | | - Karen E. Tew
- Sandia National Laboratories, Livermore, CA, United States of America
| | - Ronald F. Renzi
- Sandia National Laboratories, Livermore, CA, United States of America
| | | | - Hanyoup Kim
- Sandia National Laboratories, Livermore, CA, United States of America
| | | | - Anupama Sinha
- Sandia National Laboratories, Livermore, CA, United States of America
| | - Steven S. Branda
- Sandia National Laboratories, Livermore, CA, United States of America
| | - Kamlesh D. Patel
- Sandia National Laboratories, Livermore, CA, United States of America
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Yang R, Pagaduan JV, Yu M, Woolley AT. On chip preconcentration and fluorescence labeling of model proteins by use of monolithic columns: device fabrication, optimization, and automation. Anal Bioanal Chem 2014; 407:737-47. [PMID: 25012353 DOI: 10.1007/s00216-014-7988-0] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 06/16/2014] [Accepted: 06/20/2014] [Indexed: 12/20/2022]
Abstract
Microfluidic systems with monolithic columns have been developed for preconcentration and on-chip labeling of model proteins. Monoliths were prepared in microchannels by photopolymerization, and their properties were optimized by varying the composition and concentration of the monomers to improve flow and extraction. On-chip labeling of proteins was achieved by driving solutions through the monolith by use of voltage then incubating fluorescent dye with protein retained on the monolith. Subsequently, the labeled proteins were eluted, by applying voltages to reservoirs on the microdevice, and then detected, by monitoring laser-induced fluorescence. Monoliths prepared from octyl methacrylate combine the best protein retention with the possibility of separate elution of unattached fluorescent label with 50% acetonitrile. Finally, automated on-chip extraction and fluorescence labeling of a model protein were successfully demonstrated. This method involves facile sample pretreatment, and therefore has potential for production of integrated bioanalysis microchips.
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Affiliation(s)
- Rui Yang
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, 84602, USA
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Oliver-Calixte NJ, Uba FI, Battle KN, Weerakoon-Ratnayake KM, Soper SA. Immobilization of lambda exonuclease onto polymer micropillar arrays for the solid-phase digestion of dsDNAs. Anal Chem 2014; 86:4447-54. [PMID: 24628008 PMCID: PMC4018173 DOI: 10.1021/ac5002965] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
![]()
The
process of immobilizing enzymes onto solid supports for bioreactions
has some compelling advantages compared to their solution-based counterpart
including the facile separation of enzyme from products, elimination
of enzyme autodigestion, and increased enzyme stability and activity.
We report the immobilization of λ-exonuclease onto poly(methylmethacrylate)
(PMMA) micropillars populated within a microfluidic device for the
on-chip digestion of double-stranded DNA. Enzyme immobilization was
successfully accomplished using 3-(3-dimethylaminopropyl) carbodiimide/N-hydroxysuccinimide (EDC/NHS) coupling to carboxylic acid
functionalized PMMA micropillars. Our results suggest that the efficiency
for the catalysis of dsDNA digestion using λ-exonuclease, including
its processivity and reaction rate, were higher when the enzyme was
attached to a solid support compared to the free solution digestion.
We obtained a clipping rate of 1.0 × 103 nucleotides
s–1 for the digestion of λ-DNA (48.5 kbp)
by λ-exonuclease. The kinetic behavior of the solid-phase reactor
could be described by a fractal Michaelis–Menten model with
a catalytic efficiency nearly 17% better than the homogeneous solution-phase
reaction. The results from this work will have important ramifications
in new single-molecule DNA sequencing strategies that employ free
mononucleotide identification.
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Affiliation(s)
- Nyoté J Oliver-Calixte
- Department of Chemistry, Louisiana State University , Baton Rouge, Louisiana 70803, United States
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Affiliation(s)
- Pamela N. Nge
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602
| | - Chad I. Rogers
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602
| | - Adam T. Woolley
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT 84602
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Kovarik ML, Ornoff DM, Melvin AT, Dobes NC, Wang Y, Dickinson AJ, Gach PC, Shah PK, Allbritton NL. Micro total analysis systems: fundamental advances and applications in the laboratory, clinic, and field. Anal Chem 2013; 85:451-72. [PMID: 23140554 PMCID: PMC3546124 DOI: 10.1021/ac3031543] [Citation(s) in RCA: 170] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Michelle L. Kovarik
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Douglas M. Ornoff
- Department of Pharmacology, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Adam T. Melvin
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Nicholas C. Dobes
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Yuli Wang
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Alexandra J. Dickinson
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Philip C. Gach
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Pavak K. Shah
- Department of Biomedical Engineering, University of North Carolina, Chapel Hill, NC 27599 and North Carolina State University, Raleigh, NC 27695
| | - Nancy L. Allbritton
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599
- Department of Pharmacology, University of North Carolina, Chapel Hill, North Carolina 27599
- Department of Biomedical Engineering, University of North Carolina, Chapel Hill, NC 27599 and North Carolina State University, Raleigh, NC 27695
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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