1
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Leirs K, Dal Dosso F, Perez-Ruiz E, Decrop D, Cops R, Huff J, Hayden M, Collier N, Yu KXZ, Brown S, Lammertyn J. Bridging the Gap between Digital Assays and Point-of-Care Testing: Automated, Low Cost, and Ultrasensitive Detection of Thyroid Stimulating Hormone. Anal Chem 2022; 94:8919-8927. [PMID: 35687534 DOI: 10.1021/acs.analchem.2c00480] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Medical diagnostics is moving toward disease-related target detection at very low concentrations because of the (1) quest for early-stage diagnosis, at a point where only limited target amounts are present, (2) trend toward minimally invasive sample extraction, yielding samples containing low concentrations of target, and (3) need for straightforward sample collection, usually resulting in limited volume collected. Hence, diagnostic tools allowing ultrasensitive target detection at the point-of-care (POC) are crucial for simplified and timely diagnosis of many illnesses. Therefore, we developed an innovative, fully integrated, semi-automated, and economically viable platform based on (1) digital microfluidics (DMF), enabling automated manipulation and analysis of very low sample volumes and (2) low-cost disposable DMF chips with microwell arrays, fabricated via roll-to-roll processes and allowing digital target counting. Thyroid stimulating hormone detection was chosen as a relevant application to show the potential of the system. The assay buffer was selected using design of experiments, and the assay was optimized in terms of reagent concentration and incubation time toward maximum sensitivity. The hydrophobic-in-hydrophobic microwells showed an unparalleled seeding efficiency of 97.6% ± 0.6%. A calculated LOD of 0.0013 μIU/mL was obtained, showing the great potential of the platform, especially taking into account the very low sample volume analyzed (1.1 μL). Although validation (in biological matrix) and industrialization (full automation) steps still need to be taken, it is clear that the combination of DMF, low-cost DMF chips, and digital analyte counting in microwell arrays enables the implementation of ultrasensitive and reliable target detection at the POC.
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Affiliation(s)
- Karen Leirs
- Department of Biosystems - Biosensors group, KU Leuven, Willem de Croylaan 42, box 2428, 3001 Leuven, Belgium
| | - Francesco Dal Dosso
- Department of Biosystems - Biosensors group, KU Leuven, Willem de Croylaan 42, box 2428, 3001 Leuven, Belgium
| | - Elena Perez-Ruiz
- Department of Biosystems - Biosensors group, KU Leuven, Willem de Croylaan 42, box 2428, 3001 Leuven, Belgium
| | - Deborah Decrop
- Department of Biosystems - Biosensors group, KU Leuven, Willem de Croylaan 42, box 2428, 3001 Leuven, Belgium
| | - Ruben Cops
- Department of Biosystems - Biosensors group, KU Leuven, Willem de Croylaan 42, box 2428, 3001 Leuven, Belgium
| | - Jeffrey Huff
- Diagnostics Division Dept. 0NTA, Bldg. CP-1, Abbott Laboratories, 100 Abbott Park Rd., Abbott Park, Illinois 60064-6093, United States
| | - Mark Hayden
- Diagnostics Division Dept. 0NTA, Bldg. CP-1, Abbott Laboratories, 100 Abbott Park Rd., Abbott Park, Illinois 60064-6093, United States
| | | | - Karen X Z Yu
- Sagentia, Harston Mill, Harston, Cambridge CB227GG, UK
| | - Stephen Brown
- Sagentia, Harston Mill, Harston, Cambridge CB227GG, UK
| | - Jeroen Lammertyn
- Department of Biosystems - Biosensors group, KU Leuven, Willem de Croylaan 42, box 2428, 3001 Leuven, Belgium
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2
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Daems D, Rutten I, Bath J, Decrop D, Van Gorp H, Ruiz EP, De Feyter S, Turberfield AJ, Lammertyn J. Controlling the Bioreceptor Spatial Distribution at the Nanoscale for Single Molecule Counting in Microwell Arrays. ACS Sens 2019; 4:2327-2335. [PMID: 31436077 DOI: 10.1021/acssensors.9b00877] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The ability to detect low concentrations of protein biomarkers is crucial for the early-stage detection of many diseases and therefore indispensable for improving diagnostic devices for healthcare. Here, we demonstrate that by integrating DNA nanotechnologies like DNA origami and aptamers, we can design innovative biosensing concepts for reproducible and sensitive detection of specific targets. DNA origami structures decorated with aptamers were studied as a novel tool to structure the biosensor surface with nanoscale precision in a digital detection bioassay, enabling control of the density, orientation, and accessibility of the bioreceptor to optimize the interaction between target and aptamer. DNA origami was used to control the spatial distribution of an in-house-generated aptamer on superparamagnetic microparticles, resulting in an origami-linked digital aptamer bioassay to detect the main peanut antigen Ara h1 with 2-fold improved signal-to-noise ratio and 15-fold improved limit of detection compared to a digital bioassay without DNA origami. Moreover, the sensitivity achieved was 4 orders of magnitude higher than commercially available and literature-reported enzyme-linked immunosorbent assay techniques. In conclusion, this novel and innovative approach to engineer biosensing interfaces will be of major interest to scientists and clinicians looking for new molecular insights and ultrasensitive detection of a broad range of targets, and, for the next generation of diagnostics.
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Affiliation(s)
- Devin Daems
- Department of Biosystems, Biosensors Group, KU Leuven, Willem de Croylaan 42, B-3001 Leuven, Belgium
| | - Iene Rutten
- Department of Biosystems, Biosensors Group, KU Leuven, Willem de Croylaan 42, B-3001 Leuven, Belgium
| | - Jonathan Bath
- Department of Physics, Clarendon Laboratory, Oxford University, Parks Road, Oxford OX1 3PU, U.K
| | - Deborah Decrop
- Department of Biosystems, Biosensors Group, KU Leuven, Willem de Croylaan 42, B-3001 Leuven, Belgium
| | - Hans Van Gorp
- Department of Chemistry, Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200f, B-3001 Leuven, Belgium
| | - Elena Pérez Ruiz
- Department of Biosystems, Biosensors Group, KU Leuven, Willem de Croylaan 42, B-3001 Leuven, Belgium
| | - Steven De Feyter
- Department of Chemistry, Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200f, B-3001 Leuven, Belgium
| | - Andrew J. Turberfield
- Department of Physics, Clarendon Laboratory, Oxford University, Parks Road, Oxford OX1 3PU, U.K
| | - Jeroen Lammertyn
- Department of Biosystems, Biosensors Group, KU Leuven, Willem de Croylaan 42, B-3001 Leuven, Belgium
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3
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Zandi Shafagh R, Decrop D, Ven K, Vanderbeke A, Hanusa R, Breukers J, Pardon G, Haraldsson T, Lammertyn J, van der Wijngaart W. Reaction injection molding of hydrophilic-in-hydrophobic femtolitre-well arrays. Microsyst Nanoeng 2019; 5:25. [PMID: 31231538 PMCID: PMC6545322 DOI: 10.1038/s41378-019-0065-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 02/16/2019] [Accepted: 03/13/2019] [Indexed: 06/09/2023]
Abstract
Patterning of micro- and nanoscale topologies and surface properties of polymer devices is of particular importance for a broad range of life science applications, including cell-adhesion assays and highly sensitive bioassays. The manufacturing of such devices necessitates cumbersome multiple-step fabrication procedures and results in surface properties which degrade over time. This critically hinders their wide-spread dissemination. Here, we simultaneously mold and surface energy pattern microstructures in off-stoichiometric thiol-ene by area-selective monomer self-assembly in a rapid micro-reaction injection molding cycle. We replicated arrays of 1,843,650 hydrophilic-in-hydrophobic femtolitre-wells with long-term stable surface properties and magnetically trapped beads with 75% and 87.2% efficiency in single- and multiple-seeding events, respectively. These results form the basis for ultrasensitive digital biosensors, specifically, and for the fabrication of medical devices and life science research tools, generally.
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Affiliation(s)
- Reza Zandi Shafagh
- Department of Micro- and Nanosystems, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Deborah Decrop
- Department of Biosystems, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Karen Ven
- Department of Biosystems, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Arno Vanderbeke
- Department of Biosystems, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Robert Hanusa
- Department of Biosystems, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Jolien Breukers
- Department of Biosystems, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Gaspard Pardon
- Department of Micro- and Nanosystems, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Tommy Haraldsson
- Department of Micro- and Nanosystems, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Jeroen Lammertyn
- Department of Biosystems, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
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4
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Brancato L, Decrop D, Lammertyn J, Puers R. Surface Nanostructuring of Parylene-C Coatings for Blood Contacting Implants. Materials (Basel) 2018; 11:E1109. [PMID: 29966223 PMCID: PMC6073716 DOI: 10.3390/ma11071109] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [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: 06/11/2018] [Revised: 06/26/2018] [Accepted: 06/26/2018] [Indexed: 11/16/2022]
Abstract
This paper investigates the effects on the blood compatibility of surface nanostructuring of Parylene-C coating. The proposed technique, based on the consecutive use of O₂ and SF₆ plasma, alters the surface roughness and enhances the intrinsic hydrophobicity of Parylene-C. The degree of hydrophobicity of the prepared surface can be precisely controlled by opportunely adjusting the plasma exposure times. Static contact angle measurements, performed on treated Parylene-C, showed a maximum contact angle of 158°. The nanostructured Parylene-C retained its hydrophobicity up to 45 days, when stored in a dry environment. Storing the samples in a body-mimicking solution caused the contact angle to progressively decrease. However, at the end of the measurement, the plasma treated surfaces still exhibited a higher hydrophobicity than the untreated counterparts. The proposed treatment improved the performance of the polymer as a water diffusion barrier in a body simulating environment. Modifying the nanotopography of the polymer influences the adsorption of different blood plasma proteins. The adsorption of albumin—a platelet adhesion inhibitor—and of fibrinogen—a platelet adhesion promoter—was studied by fluorescence microscopy. The adsorption capacity increased monotonically with increasing hydrophobicity for both studied proteins. The effect on albumin adsorption was considerably higher than on fibrinogen. Study of the proteins simultaneous adsorption showed that the albumin to fibrinogen adsorbed ratio increases with substrate hydrophobicity, suggesting lower thrombogenicity of the nanostructured surfaces. Animal experiments proved that the treated surfaces did not trigger any blood clot or thrombus formation when directly exposed to the arterial blood flow. The findings above, together with the exceptional mechanical and insulation properties of Parylene-C, support its use for packaging implants chronically exposed to the blood flow.
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Affiliation(s)
- Luigi Brancato
- ESAT-MICAS, KU Leuven, Kasteelpark Arenberg 10, 3001 Heverlee, Belgium.
| | - Deborah Decrop
- Department of Biosystems⁻MeBioS, KU Leuven, Willem de Croylaan 42, 3001 Heverlee, Belgium.
| | - Jeroen Lammertyn
- Department of Biosystems⁻MeBioS, KU Leuven, Willem de Croylaan 42, 3001 Heverlee, Belgium.
| | - Robert Puers
- ESAT-MICAS, KU Leuven, Kasteelpark Arenberg 10, 3001 Heverlee, Belgium.
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5
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Ven K, Vanspauwen B, Pérez-Ruiz E, Leirs K, Decrop D, Gerstmans H, Spasic D, Lammertyn J. Target Confinement in Small Reaction Volumes Using Microfluidic Technologies: A Smart Approach for Single-Entity Detection and Analysis. ACS Sens 2018; 3:264-284. [PMID: 29363316 DOI: 10.1021/acssensors.7b00873] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Over the last decades, the study of cells, nucleic acid molecules, and proteins has evolved from ensemble measurements to so-called single-entity studies. The latter offers huge benefits, not only as biological research tools to examine heterogeneities among individual entities within a population, but also as biosensing tools for medical diagnostics, which can reach the ultimate sensitivity by detecting single targets. Whereas various techniques for single-entity detection have been reported, this review focuses on microfluidic systems that physically confine single targets in small reaction volumes. We categorize these techniques as droplet-, microchamber-, and nanostructure-based and provide an overview of their implementation for studying single cells, nucleic acids, and proteins. We furthermore reflect on the advantages and limitations of these techniques and highlight future opportunities in the field.
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Affiliation(s)
- Karen Ven
- Department
of Biosystems, KU Leuven - University of Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Bram Vanspauwen
- Department
of Biosystems, KU Leuven - University of Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Elena Pérez-Ruiz
- Department
of Biosystems, KU Leuven - University of Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Karen Leirs
- Department
of Biosystems, KU Leuven - University of Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Deborah Decrop
- Department
of Biosystems, KU Leuven - University of Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Hans Gerstmans
- Department
of Biosystems, KU Leuven - University of Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
- Department
of Applied biosciences, Ghent University, Valentyn Vaerwyckweg 1 - building
C, 9000 Gent, Belgium
- Department
of Biosystems, KU Leuven - University of Leuven, Kasteelpark Arenberg
21, 3001 Leuven, Belgium
| | - Dragana Spasic
- Department
of Biosystems, KU Leuven - University of Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Jeroen Lammertyn
- Department
of Biosystems, KU Leuven - University of Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
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6
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Pérez-Ruiz E, Decrop D, Ven K, Tripodi L, Leirs K, Rosseels J, van de Wouwer M, Geukens N, De Vos A, Vanmechelen E, Winderickx J, Lammertyn J, Spasic D. Digital ELISA for the quantification of attomolar concentrations of Alzheimer's disease biomarker protein Tau in biological samples. Anal Chim Acta 2018. [PMID: 29530254 DOI: 10.1016/j.aca.2018.02.011] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The close correlation between Tau pathology and Alzheimer's disease (AD) progression makes this protein a suitable biomarker for diagnosis and monitoring of the disorder evolution. However, the use of Tau in diagnostics has been hampered, as it currently requires collection of cerebrospinal fluid (CSF), which is an invasive clinical procedure. Although measuring Tau-levels in blood plasma would be favorable, the concentrations are below the detection limit of a conventional ELISA. In this work, we developed a digital ELISA for the quantification of attomolar protein Tau concentrations in both buffer and biological samples. Individual Tau molecules were first captured on the surface of magnetic particles using in-house developed antibodies and subsequently isolated into the femtoliter-sized wells of a 2 × 2 mm2 microwell array. Combination of high-affinity antibodies, optimal assay conditions and a digital quantification approach resulted in a 24 ± 7 aM limit of detection (LOD) in buffer samples. Additionally, a dynamic range of 6 orders of magnitude was achieved by combining the digital readout with an analogue approach, allowing quantification from attomolar to picomolar levels of Tau using the same platform. This proves the compatibility of the presented assay with the wide range of Tau concentrations encountered in different biological samples. Next, the developed digital assay was applied to detect total Tau levels in spiked blood plasma. A similar LOD (55 ± 29 aM) was obtained compared to the buffer samples, which was 5000-fold more sensitive than commercially available ELISAs and even outperformed previously reported digital assays with 10-fold increase in sensitivity. Finally, the performance of the developed digital ELISA was assessed by quantifying protein Tau in three clinical CSF samples. Here, a high correlation (i.e. Pearson coefficient of 0.99) was found between the measured percentage of active particles and the reference protein Tau values. The presented digital ELISA technology has great capacity in unlocking the potential of Tau as biomarker for early AD diagnosis.
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Affiliation(s)
- Elena Pérez-Ruiz
- Department of Biosystems, MeBioS-Biosensors Group, KU Leuven, 3001 Leuven, Belgium
| | - Deborah Decrop
- Department of Biosystems, MeBioS-Biosensors Group, KU Leuven, 3001 Leuven, Belgium
| | - Karen Ven
- Department of Biosystems, MeBioS-Biosensors Group, KU Leuven, 3001 Leuven, Belgium
| | - Lisa Tripodi
- Department of Biosystems, MeBioS-Biosensors Group, KU Leuven, 3001 Leuven, Belgium
| | - Karen Leirs
- Department of Biosystems, MeBioS-Biosensors Group, KU Leuven, 3001 Leuven, Belgium
| | - Joelle Rosseels
- Department of Biology, Laboratory of Functional Biology, KU Leuven, 3001 Leuven, Belgium
| | | | - Nick Geukens
- PharmAbs, The KU Leuven Antibody Center, KU Leuven, Belgium
| | - Ann De Vos
- ADx NeuroSciences, Gent-Zwijnaarde, Belgium
| | | | - Joris Winderickx
- Department of Biology, Laboratory of Functional Biology, KU Leuven, 3001 Leuven, Belgium
| | - Jeroen Lammertyn
- Department of Biosystems, MeBioS-Biosensors Group, KU Leuven, 3001 Leuven, Belgium.
| | - Dragana Spasic
- Department of Biosystems, MeBioS-Biosensors Group, KU Leuven, 3001 Leuven, Belgium
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7
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Dal Dosso F, Decrop D, Pérez-Ruiz E, Daems D, Agten H, Al-Ghezi O, Bollen O, Breukers J, De Rop F, Katsafadou M, Lepoudre J, Lyu L, Piron P, Saesen R, Sels S, Soenen R, Staljanssens E, Taraporewalla J, Kokalj T, Spasic D, Lammertyn J. Creasensor: SIMPLE technology for creatinine detection in plasma. Anal Chim Acta 2017; 1000:191-198. [PMID: 29289308 DOI: 10.1016/j.aca.2017.11.026] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 11/15/2017] [Accepted: 11/17/2017] [Indexed: 01/08/2023]
Abstract
The lab-on-a-chip (LOC) field has witnessed an excess of new technology concepts, especially for the point-of-care (POC) applications. However, only few concepts reached the POC market often because of challenging integration with pumping and detection systems as well as with complex biological assays. Recently, a new technology termed SIMPLE was introduced as a promising POC platform due to its features of being self-powered, autonomous in liquid manipulations, cost-effective and amenable to mass production. In this paper, we improved the SIMPLE design and fabrication and demonstrated for the first time that the SIMPLE platform can be successfully integrated with biological assays by quantifying creatinine, biomarker for chronic kidney disease, in plasma samples. To validate the robustness of the SIMPLE technology, we integrated a SIMPLE-based microfluidic cartridge with colorimetric read-out system into the benchtop Creasensor. This allowed us to perform on-field validation of the Creasensor in a single-blind study with 16 plasma samples, showing excellent agreement between measured and spiked creatinine concentrations (ICC: 0.97). Moreover, the range of clinically relevant concentrations (0.76-20 mg/dL), the sample volume (5 μL) and time-to-result of only 5 min matched the Creasensor performance with both lab based and POC benchmark technologies. This study demonstrated for the first time outstanding robustness of the SIMPLE in supporting the implementation of biological assays. The SIMPLE flexibility in liquid manipulation and compatibility with different sample matrices opens up numerous opportunities for implementing more complex assays and expanding its POC applications portfolio.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Linye Lyu
- BIOSYST-MeBioS, KU Leuven, Leuven, Belgium
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8
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Decrop D, Pardon G, Brancato L, Kil D, Zandi Shafagh R, Kokalj T, Haraldsson T, Puers R, van der Wijngaart W, Lammertyn J. Single-Step Imprinting of Femtoliter Microwell Arrays Allows Digital Bioassays with Attomolar Limit of Detection. ACS Appl Mater Interfaces 2017; 9:10418-10426. [PMID: 28266828 DOI: 10.1021/acsami.6b15415] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Bead-based microwell array technology is growing as an ultrasensitive analysis tool as exemplified by the successful commercial applications from Illumina and Quanterix for nucleic acid analysis and ultrasensitive protein measurements, respectively. High-efficiency seeding of magnetic beads is key for these applications and is enhanced by hydrophilic-in-hydrophobic microwell arrays, which are unfortunately often expensive or labor-intensive to manufacture. Here, we demonstrate a new single-step manufacturing approach for imprinting cheap and disposable hydrophilic-in-hydrophobic microwell arrays suitable for digital bioassays. Imprinting of arrays with hydrophilic-in-hydrophobic microwells is made possible using an innovative surface energy replication approach by means of a hydrophobic thiol-ene polymer formulation. In this polymer, hydrophobic-moiety-containing monomers self-assemble at the hydrophobic surface of the imprinting stamp, which results in a hydrophobic replica surface after polymerization. After removing the stamp, microwells with hydrophobic walls and a hydrophilic bottom are obtained. We demonstrate that the hydrophilic-in-hydrophobic imprinted microwell arrays enable successful and efficient self-assembly of individual water droplets and seeding of magnetic beads with loading efficiencies up to 96%. We also demonstrate the suitability of the microwell arrays for the isolation and digital counting of single molecules achieving a limit of detection of 17.4 aM when performing a streptavidin-biotin binding assay as model system. Since this approach is up-scalable through reaction injection molding, we expect it will contribute substantially to the translation of ultrasensitive digital microwell array technology toward diagnostic applications.
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Affiliation(s)
- Deborah Decrop
- Department of Biosystems, KU Leuven-University of Leuven , Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Gaspard Pardon
- Department of Micro- and Nanosystems, KTH Royal Institute of Technology , Stockholm, Sweden
| | - Luigi Brancato
- Department of Electrotechnical Engineering (ESAT-MICAS), KU Leuven-University of Leuven , Kasteelpark Arenberg 10, 3001 Leuven, Belgium
| | - Dries Kil
- Department of Electrotechnical Engineering (ESAT-MICAS), KU Leuven-University of Leuven , Kasteelpark Arenberg 10, 3001 Leuven, Belgium
| | - Reza Zandi Shafagh
- Department of Micro- and Nanosystems, KTH Royal Institute of Technology , Stockholm, Sweden
| | - Tadej Kokalj
- Department of Biosystems, KU Leuven-University of Leuven , Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Tommy Haraldsson
- Department of Micro- and Nanosystems, KTH Royal Institute of Technology , Stockholm, Sweden
| | - Robert Puers
- Department of Electrotechnical Engineering (ESAT-MICAS), KU Leuven-University of Leuven , Kasteelpark Arenberg 10, 3001 Leuven, Belgium
| | | | - Jeroen Lammertyn
- Department of Biosystems, KU Leuven-University of Leuven , Willem de Croylaan 42, 3001 Leuven, Belgium
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9
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Leirs K, Tewari Kumar P, Decrop D, Pérez-Ruiz E, Leblebici P, Van Kelst B, Compernolle G, Meeuws H, Van Wesenbeeck L, Lagatie O, Stuyver L, Gils A, Lammertyn J, Spasic D. Bioassay Development for Ultrasensitive Detection of Influenza A Nucleoprotein Using Digital ELISA. Anal Chem 2016; 88:8450-8. [DOI: 10.1021/acs.analchem.6b00502] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Karen Leirs
- BIOSYST-MeBioS, KU Leuven, 3001 Leuven, Belgium
| | | | | | | | | | | | - Griet Compernolle
- Laboratory
for Therapeutic and Diagnostic Antibodies, KU Leuven, 3000 Leuven, Belgium
| | | | | | | | | | - Ann Gils
- Laboratory
for Therapeutic and Diagnostic Antibodies, KU Leuven, 3000 Leuven, Belgium
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10
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Decrop D, Brans T, Gijsenbergh P, Lu J, Spasic D, Kokalj T, Beunis F, Goos P, Puers R, Lammertyn J. Optical Manipulation of Single Magnetic Beads in a Microwell Array on a Digital Microfluidic Chip. Anal Chem 2016; 88:8596-603. [PMID: 27448015 DOI: 10.1021/acs.analchem.6b01734] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The detection of single molecules in magnetic microbead microwell array formats revolutionized the development of digital bioassays. However, retrieval of individual magnetic beads from these arrays has not been realized until now despite having great potential for studying captured targets at the individual level. In this paper, optical tweezers were implemented on a digital microfluidic platform for accurate manipulation of single magnetic beads seeded in a microwell array. Successful optical trapping of magnetic beads was found to be dependent on Brownian motion of the beads, suggesting a 99% chance of trapping a vibrating bead. A tailor-made experimental design was used to screen the effect of bead type, ionic buffer strength, surfactant type, and concentration on the Brownian activity of beads in microwells. With the optimal conditions, the manipulation of magnetic beads was demonstrated by their trapping, retrieving, transporting, and repositioning to a desired microwell on the array. The presented platform combines the strengths of digital microfluidics, digital bioassays, and optical tweezers, resulting in a powerful dynamic microwell array system for single molecule and single cell studies.
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Affiliation(s)
- Deborah Decrop
- Department of Biosystems, MEBIOS-Biosensors, KU Leuven , Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Toon Brans
- Department of Electronics and Information Systems (ELIS) and Center for Nano and Biophotonics (NB-Photonics), UGent , Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium
| | - Pieter Gijsenbergh
- Department of Electrotechnical Engineering (ESAT-MICAS), KU Leuven , Kasteelpark Arenberg 10 Postbus 2440, 3001 Leuven, Belgium
| | - Jiadi Lu
- Department of Biosystems, MEBIOS-Biosensors, KU Leuven , Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Dragana Spasic
- Department of Biosystems, MEBIOS-Biosensors, KU Leuven , Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Tadej Kokalj
- Department of Biosystems, MEBIOS-Biosensors, KU Leuven , Willem de Croylaan 42, 3001 Leuven, Belgium
| | - Filip Beunis
- Department of Electronics and Information Systems (ELIS) and Center for Nano and Biophotonics (NB-Photonics), UGent , Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium
| | - Peter Goos
- Department of Biosystems, MEBIOS-Biosensors, KU Leuven , Willem de Croylaan 42, 3001 Leuven, Belgium.,Faculty of Applied Economics, University of Antwerp, Stadscampus , Prinsstraat 13, 2000 Antwerp, Belgium
| | - Robert Puers
- Department of Electrotechnical Engineering (ESAT-MICAS), KU Leuven , Kasteelpark Arenberg 10 Postbus 2440, 3001 Leuven, Belgium
| | - Jeroen Lammertyn
- Department of Biosystems, MEBIOS-Biosensors, KU Leuven , Willem de Croylaan 42, 3001 Leuven, Belgium
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