1
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Vloemans D, Van Hileghem L, Ordutowski H, Dal Dosso F, Spasic D, Lammertyn J. Self-Powered Microfluidics for Point-of-Care Solutions: From Sampling to Detection of Proteins and Nucleic Acids. Methods Mol Biol 2024; 2804:3-50. [PMID: 38753138 DOI: 10.1007/978-1-0716-3850-7_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/21/2024]
Abstract
Self-powered microfluidics presents a revolutionary approach to address the challenges of healthcare in decentralized and point-of-care settings where limited access to resources and infrastructure prevails or rapid clinical decision-making is critical. These microfluidic systems exploit physical and chemical phenomena, such as capillary forces and surface tension, to manipulate tiny volumes of fluids without the need for external power sources, making them cost-effective and highly portable. Recent technological advancements have demonstrated the ability to preprogram complex multistep liquid operations within the microfluidic circuit of these standalone systems, which enabled the integration of sensitive detection and readout principles. This chapter first addresses how the accessibility to in vitro diagnostics can be improved by shifting toward decentralized approaches like remote microsampling and point-of-care testing. Next, the crucial role of self-powered microfluidic technologies to enable this patient-centric healthcare transition is emphasized using various state-of-the-art examples, with a primary focus on applications related to biofluid collection and the detection of either proteins or nucleic acids. This chapter concludes with a summary of the main findings and our vision of the future perspectives in the field of self-powered microfluidic technologies and their use for in vitro diagnostics applications.
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Affiliation(s)
- Dries Vloemans
- Department of Biosystems - Biosensors Group, KU Leuven, Leuven, Belgium
| | | | - Henry Ordutowski
- Department of Biosystems - Biosensors Group, KU Leuven, Leuven, Belgium
| | | | - Dragana Spasic
- Department of Biosystems - Biosensors Group, KU Leuven, Leuven, Belgium
| | - Jeroen Lammertyn
- Department of Biosystems - Biosensors Group, KU Leuven, Leuven, Belgium.
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2
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Yasuga H. Methods to spontaneously generate three dimensionally arrayed microdroplets triggered by capillarity for bioassays and bioengineering. Biophys Physicobiol 2023; 20:e200029. [PMID: 38496237 PMCID: PMC10941964 DOI: 10.2142/biophysico.bppb-v20.0029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 06/08/2023] [Indexed: 03/19/2024] Open
Abstract
Herein, I review our recent work toward developing methods for generating three-dimensional (3D) droplet arrays driven by capillarity. Microdroplet array-based systems are useful for bioassays and bioengineering because they require only small amounts of samples and reagents and provide the high throughput. Various methods have been developed for preparing droplet arrays, among which methods based on capillarity have attracted considerable attention owing to their simplicity. I and collaborators have developed such methods based on capillary flow, including a method for preparing droplet arrays via oil-water replacement. We recently proposed our own concept of "fluid-fluid interfacial energy driven 3D structure emergence in a micropillar scaffold (FLUID3EAMS)" and its application. FLUID3EAMS allows a 3D droplet (or hydrogel bead) array to be generated in a micropillar scaffold by passing a fluid-fluid interface through the scaffold. This approach is useful for applications requiring ordered or arrayed microdroplets in biosensors, biophysics, biology, and tissue engineering. This review is an extended version of the article "FLUID3EAMS: Fluid-Fluid Interfacial Energy Driven 3D Structure Emergence in a Micropillar Scaffold and Development in Bioengineering" published in Seibutsu Butsuri (vol. 62, p. 110-113, 2022).
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Affiliation(s)
- Hiroki Yasuga
- Sensing System Research Center, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8564, Japan
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3
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Rodríguez CF, Andrade-Pérez V, Vargas MC, Mantilla-Orozco A, Osma JF, Reyes LH, Cruz JC. Breaking the clean room barrier: exploring low-cost alternatives for microfluidic devices. Front Bioeng Biotechnol 2023; 11:1176557. [PMID: 37180035 PMCID: PMC10172592 DOI: 10.3389/fbioe.2023.1176557] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 04/17/2023] [Indexed: 05/15/2023] Open
Abstract
Microfluidics is an interdisciplinary field that encompasses both science and engineering, which aims to design and fabricate devices capable of manipulating extremely low volumes of fluids on a microscale level. The central objective of microfluidics is to provide high precision and accuracy while using minimal reagents and equipment. The benefits of this approach include greater control over experimental conditions, faster analysis, and improved experimental reproducibility. Microfluidic devices, also known as labs-on-a-chip (LOCs), have emerged as potential instruments for optimizing operations and decreasing costs in various of industries, including pharmaceutical, medical, food, and cosmetics. However, the high price of conventional prototypes for LOCs devices, generated in clean room facilities, has increased the demand for inexpensive alternatives. Polymers, paper, and hydrogels are some of the materials that can be utilized to create the inexpensive microfluidic devices covered in this article. In addition, we highlighted different manufacturing techniques, such as soft lithography, laser plotting, and 3D printing, that are suitable for creating LOCs. The selection of materials and fabrication techniques will depend on the specific requirements and applications of each individual LOC. This article aims to provide a comprehensive overview of the numerous alternatives for the development of low-cost LOCs to service industries such as pharmaceuticals, chemicals, food, and biomedicine.
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Affiliation(s)
| | | | - María Camila Vargas
- Department of Biomedical Engineering, Universidad de Los Andes, Bogotá, Colombia
| | | | - Johann F. Osma
- Department of Biomedical Engineering, Universidad de Los Andes, Bogotá, Colombia
| | - Luis H. Reyes
- Department of Chemical and Food Engineering, Universidad de Los Andes, Bogotá, Colombia
- *Correspondence: Luis H. Reyes, ; Juan C. Cruz,
| | - Juan C. Cruz
- Department of Biomedical Engineering, Universidad de Los Andes, Bogotá, Colombia
- *Correspondence: Luis H. Reyes, ; Juan C. Cruz,
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4
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Geissler M, Ponton A, Nassif C, Malic L, Turcotte K, Lukic L, Morton KJ, Veres T. Use of Polymer Micropillar Arrays as Templates for Solid-Phase Immunoassays. ACS APPLIED POLYMER MATERIALS 2022; 4:5287-5297. [PMID: 37552739 PMCID: PMC9173674 DOI: 10.1021/acsapm.2c00163] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 04/20/2022] [Indexed: 08/10/2023]
Abstract
We investigate the use of periodic micropillar arrays produced by high-fidelity microfabrication with cyclic olefin polymers for solid-phase immunoassays. These three-dimensional (3D) templates offer higher surface-to-volume ratios than two-dimensional substrates, making it possible to attach more antibodies and so increase the signal obtained by the assay. Micropillar arrays also provide the capacity to induce wicking, which is used to distribute and confine antibodies on the surface with spatial control. Micropillar array substrates are modified by using oxygen plasma treatment, followed by grafting of (3-aminopropyl)triethoxysilane for binding proteins covalently using glutaraldehyde as a cross-linker. The relationship between microstructure and fluorescence signal was investigated through variation of pitch (10-50 μm), pillar diameter (5-40 μm), and pillar height (5-57 μm). Our findings suggest that signal intensity scales proportionally with the 3D surface area available for performing solid-phase immunoassays. A linear relationship between fluorescence intensity and microscale structure can be maintained even when the aspect ratio and pillar density both become very high, opening the possibility of tuning assay response by design such that desired signal intensity is obtained over a wide dynamic range compatible with different assays, analyte concentrations, and readout instruments. We demonstrate the versatility of the approach by performing the most common immunoassay formats-direct, indirect, and sandwich-in a qualitative fashion by using colorimetric and fluorescence-based detection for a number of clinically relevant protein markers, such as tumor necrosis factor alpha, interferon gamma (IFN-γ), and spike protein of severe acute respiratory syndrome coronavirus 2. We also show quantitative detection of IFN-γ in serum using a fluorescence-based sandwich immunoassay and calibrated samples with spike-in concentrations ranging from 50 pg/mL to 5 μg/mL, yielding an estimated limit of detection of ∼1 pg/mL for arrays with high micropillar density (11561 per mm2) and aspect ratio (1:11.35).
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Affiliation(s)
- Matthias Geissler
- Life Sciences Division, National Research Council of
Canada, 75 de Mortagne Boulevard, Boucherville, QC J4B 6Y4,
Canada
| | - André Ponton
- Life Sciences Division, National Research Council of
Canada, 75 de Mortagne Boulevard, Boucherville, QC J4B 6Y4,
Canada
| | - Christina Nassif
- Life Sciences Division, National Research Council of
Canada, 75 de Mortagne Boulevard, Boucherville, QC J4B 6Y4,
Canada
| | - Lidija Malic
- Life Sciences Division, National Research Council of
Canada, 75 de Mortagne Boulevard, Boucherville, QC J4B 6Y4,
Canada
| | - Karine Turcotte
- Life Sciences Division, National Research Council of
Canada, 75 de Mortagne Boulevard, Boucherville, QC J4B 6Y4,
Canada
| | - Ljuboje Lukic
- Life Sciences Division, National Research Council of
Canada, 75 de Mortagne Boulevard, Boucherville, QC J4B 6Y4,
Canada
| | - Keith J. Morton
- Life Sciences Division, National Research Council of
Canada, 75 de Mortagne Boulevard, Boucherville, QC J4B 6Y4,
Canada
| | - Teodor Veres
- Life Sciences Division, National Research Council of
Canada, 75 de Mortagne Boulevard, Boucherville, QC J4B 6Y4,
Canada
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5
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High-Performance Passive Plasma Separation on OSTE Pillar Forest. BIOSENSORS-BASEL 2021; 11:bios11100355. [PMID: 34677311 PMCID: PMC8534190 DOI: 10.3390/bios11100355] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Revised: 09/07/2021] [Accepted: 09/20/2021] [Indexed: 12/15/2022]
Abstract
Plasma separation is of high interest for lateral flow tests using whole blood as sample liquids. Here, we built a passive microfluidic device for plasma separation with high performance. This device was made by blood filtration membrane and off-stoichiometry thiol-ene (OSTE) pillar forest. OSTE pillar forest was fabricated by double replica moldings of a laser-cut polymethylmethacrylate (PMMA) mold, which has a uniform microstructure. This device utilized a filtration membrane to separate plasma from whole blood samples and used hydrophilic OSTE pillar forest as the capillary pump to propel the plasma. The device can be used to separate blood plasma with high purity for later use in lateral flow tests. The device can process 45 μL of whole blood in 72 s and achieves a plasma separation yield as high as 60.0%. The protein recovery rate of separated plasma is 85.5%, which is on par with state-of-the-art technologies. This device can be further developed into lateral flow tests for biomarker detection in whole blood.
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6
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Cognetti JS, Steiner DJ, Abedin M, Bryan MR, Shanahan C, Tokranova N, Young E, Klose AM, Zavriyev A, Judy N, Piorek B, Meinhart C, Jakubowicz R, Warren H, Cady NC, Miller BL. Disposable photonics for cost-effective clinical bioassays: application to COVID-19 antibody testing. LAB ON A CHIP 2021; 21:2913-2921. [PMID: 34160511 DOI: 10.1039/d1lc00369k] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Decades of research have shown that biosensors using photonic circuits fabricated using CMOS processes can be highly sensitive, selective, and quantitative. Unfortunately, the cost of these sensors combined with the complexity of sample handling systems has limited the use of such sensors in clinical diagnostics. We present a new "disposable photonics" sensor platform in which rice-sized (1 × 4 mm) silicon nitride ring resonator sensor chips are paired with plastic micropillar fluidic cards for sample handling and optical detection. We demonstrate the utility of the platform in the context of detecting human antibodies to SARS-CoV-2, both in convalescent COVID-19 patients and for subjects undergoing vaccination. Given its ability to provide quantitative data on human samples in a simple, low-cost single-use format, we anticipate that this platform will find broad utility in clinical diagnostics for a broad range of assays.
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Affiliation(s)
- John S Cognetti
- Department of Biomedical Engineering, University of Rochester, Rochester, New York, USA.
| | - Daniel J Steiner
- Department of Biochemistry and Biophysics, University of Rochester, Rochester, New York, USA
| | - Minhaz Abedin
- College of Nanoscale Science and Engineering, SUNY Polytechnic, Albany, New York, USA
| | - Michael R Bryan
- Department of Biochemistry and Biophysics, University of Rochester, Rochester, New York, USA
| | - Conor Shanahan
- Department of Biomedical Engineering, University of Rochester, Rochester, New York, USA.
| | - Natalya Tokranova
- College of Nanoscale Science and Engineering, SUNY Polytechnic, Albany, New York, USA
| | - Ethan Young
- Ortho-Clinical Diagnostics, Rochester, New York, USA
| | - Alanna M Klose
- Department of Dermatology, University of Rochester, Rochester, New York, USA
| | | | - Nicholas Judy
- Department of Mechanical Engineering, University of California at Santa Barbara, Santa Barbara, California, USA
| | - Brian Piorek
- Department of Mechanical Engineering, University of California at Santa Barbara, Santa Barbara, California, USA
| | - Carl Meinhart
- Department of Mechanical Engineering, University of California at Santa Barbara, Santa Barbara, California, USA
| | | | - Harold Warren
- Ortho-Clinical Diagnostics, Rochester, New York, USA
| | - Nathaniel C Cady
- College of Nanoscale Science and Engineering, SUNY Polytechnic, Albany, New York, USA
| | - Benjamin L Miller
- Department of Biomedical Engineering, University of Rochester, Rochester, New York, USA. and Department of Biochemistry and Biophysics, University of Rochester, Rochester, New York, USA and Institute of Optics, University of Rochester, Rochester, New York, USA and Department of Dermatology, University of Rochester, Rochester, New York, USA
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7
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Controlling Capillary Flow Rate on Lateral Flow Test Substrates by Tape. MICROMACHINES 2021; 12:mi12050562. [PMID: 34065694 PMCID: PMC8156355 DOI: 10.3390/mi12050562] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/23/2021] [Revised: 05/13/2021] [Accepted: 05/14/2021] [Indexed: 11/17/2022]
Abstract
Controlling capillary flow rate of sample liquid is of high interest for lateral flow tests, since the flow rate can affect the dissolution and mixing of the immunoreagents and the efficiency of immunoreactions. Here we develop a facile method to adjust the capillary flow rate on lateral flow test substrates by using tape to cover the surface of substrates. We test this method on the traditional lateral flow test substrate—nitrocellulose and a novel lateral flow test substrate—synthetic paper, which is a porous media made by interlocked off-stoichiometry thiol-ene (OSTE) micropillars. We found that after the surface was covered by tape, the average flow rate decreased to 61% of the original flow rate on nitrocellulose, while the average flow rate increased to at least 320% of the original flow rate on synthetic paper. More interesting, besides the increase of flow rate, the volume capacity of synthetic paper also increases after covered by tape. Furthermore, we investigated the influence of length and position of tape on the capillary flow rate for nitrocellulose. A longer tape will lead to a smaller flow rate. The influence of tape of same length on the flow rate is bigger when the tape is placed closer to the loading pad. These results can help in the flow rate control on lateral flow test substrates, and potentially improve the performance of lateral flow tests.
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8
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Márquez A, Santos MV, Guirado G, Moreno A, Aznar-Cervantes SD, Cenis JL, Santagneli SH, Domínguez C, Omenetto FG, Muñoz-Berbel X. Nanoporous silk films with capillary action and size-exclusion capacity for sensitive glucose determination in whole blood. LAB ON A CHIP 2021; 21:608-615. [PMID: 33404577 DOI: 10.1039/d0lc00702a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In optical biosensing, silk fibroin (SF) appears as a promising alternative where other materials, such as paper, find limitations. Besides its excellent optical properties and unmet capacity to stabilize biomacromolecules, SF in test strips exhibits additional functions, i.e. capillary pumping activity of 1.5 mm s-1, capacity to filter blood cells thanks to its small, but tuneable, porosity and enhanced biosensing sensitivity. The bulk functionalization of SF with the enzymes glucose oxidase and peroxidase and the mediator ABTS produces colourless and transparent SF films that respond to blood glucose increasing 2.5 times the sensitivity of conventional ABTS-based assays. This enhanced sensitivity results from the formation of SF-ABTS complexes, where SF becomes part of the bioassay. Additionally, SF films triple the durability of most stable cellulose-based sensors. Although demonstrated for glucose, SF microfluidic test strips may incorporate other optical bioassays, e.g. immunoassays, with the aim of transferring them from central laboratories to the place of patient's care.
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Affiliation(s)
- Augusto Márquez
- Instituto de Microelectrónica de Barcelona (IMB-CNM, CSIC), Bellaterra, Barcelona 08193, Spain. xavier.munoz@imb-cnm
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9
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Zandi Shafagh R, Shen JX, Youhanna S, Guo W, Lauschke VM, van der Wijngaart W, Haraldsson T. Facile Nanoimprinting of Robust High-Aspect-Ratio Nanostructures for Human Cell Biomechanics. ACS APPLIED BIO MATERIALS 2020; 3:8757-8767. [PMID: 35019647 DOI: 10.1021/acsabm.0c01087] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
High-aspect-ratio and hierarchically nanostructured surfaces are common in nature. Synthetic variants are of interest for their specific chemical, mechanic, electric, photonic, or biologic properties but are cumbersome in fabrication or suffer from structural collapse. Here, we replicated and directly biofunctionalized robust, large-area, and high-aspect-ratio nanostructures by nanoimprint lithography of an off-stoichiometric thiol-ene-epoxy polymer. We structured-in a single-step process-dense arrays of pillars with a diameter as low as 100 nm and an aspect ratio of 7.2; holes with a diameter of 70 nm and an aspect ratio of >20; and complex hierarchically layered structures, all with minimal collapse and defectivity. We show that the nanopillar arrays alter mechanosensing of human hepatic cells and provide precise spatial control of cell attachment. We speculate that our results can enable the widespread use of high-aspect-ratio nanotopograhy applications in mechanics, optics, and biomedicine.
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Affiliation(s)
- Reza Zandi Shafagh
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden.,Division of Micro- and Nanosystems, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden
| | - Joanne X Shen
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Sonia Youhanna
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Weijin Guo
- Division of Micro- and Nanosystems, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden
| | - Volker M Lauschke
- Department of Physiology and Pharmacology, Karolinska Institutet, 171 77 Stockholm, Sweden
| | | | - Tommy Haraldsson
- Division of Micro- and Nanosystems, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden
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10
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Kamiya H, Yasuga H, Miki N. Ion concentration measurement using synthetic microfluidic papers. PLoS One 2020; 15:e0242188. [PMID: 33211718 PMCID: PMC7676646 DOI: 10.1371/journal.pone.0242188] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 10/28/2020] [Indexed: 11/19/2022] Open
Abstract
Non-invasive diagnosis on biological liquid samples, such as urine, sweat, saliva, and tears, may allow patients to evaluate their health by themselves. To obtain accurate diagnostic results, target liquid must be precisely sampled. Conventionally, urine sampling using filter paper can be given as an example sampling, but differences in the paper structure can cause variations in sampling volume. This paper describes precise liquid sampling using synthetic microfluidic papers, which are composed of obliquely combined micropillars. Sampling volume accuracy was investigated using different designs and collection methods to determine the optimal design and sample collecting method. The optimized protocol was followed to accurately measure potassium concentration using synthetic microfluidic paper and a commercially available densitometer, which verified the usefulness of the synthetic microfluidic papers for precision sampling.
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Affiliation(s)
- Haruka Kamiya
- School of Integrated Design Engineering, Keio University, Yokohama, Kanagawa, Japan
| | - Hiroki Yasuga
- School of Integrated Design Engineering, Keio University, Yokohama, Kanagawa, Japan
- Waseda Research Institute for Science and Engineering, Waseda University, Ookubo, Shinjuku-ku, Tokyo, Japan
| | - Norihisa Miki
- School of Integrated Design Engineering, Keio University, Yokohama, Kanagawa, Japan
- * E-mail:
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11
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Orooji Y, Sohrabi H, Hemmat N, Oroojalian F, Baradaran B, Mokhtarzadeh A, Mohaghegh M, Karimi-Maleh H. An Overview on SARS-CoV-2 (COVID-19) and Other Human Coronaviruses and Their Detection Capability via Amplification Assay, Chemical Sensing, Biosensing, Immunosensing, and Clinical Assays. NANO-MICRO LETTERS 2020; 13:18. [PMID: 33163530 PMCID: PMC7604542 DOI: 10.1007/s40820-020-00533-y] [Citation(s) in RCA: 111] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Accepted: 09/06/2020] [Indexed: 05/03/2023]
Abstract
A novel coronavirus of zoonotic origin (SARS-CoV-2) has recently been recognized in patients with acute respiratory disease. COVID-19 causative agent is structurally and genetically similar to SARS and bat SARS-like coronaviruses. The drastic increase in the number of coronavirus and its genome sequence have given us an unprecedented opportunity to perform bioinformatics and genomics analysis on this class of viruses. Clinical tests like PCR and ELISA for rapid detection of this virus are urgently needed for early identification of infected patients. However, these techniques are expensive and not readily available for point-of-care (POC) applications. Currently, lack of any rapid, available, and reliable POC detection method gives rise to the progression of COVID-19 as a horrible global problem. To solve the negative features of clinical investigation, we provide a brief introduction of the general features of coronaviruses and describe various amplification assays, sensing, biosensing, immunosensing, and aptasensing for the determination of various groups of coronaviruses applied as a template for the detection of SARS-CoV-2. All sensing and biosensing techniques developed for the determination of various classes of coronaviruses are useful to recognize the newly immerged coronavirus, i.e., SARS-CoV-2. Also, the introduction of sensing and biosensing methods sheds light on the way of designing a proper screening system to detect the virus at the early stage of infection to tranquilize the speed and vastity of spreading. Among other approaches investigated among molecular approaches and PCR or recognition of viral diseases, LAMP-based methods and LFAs are of great importance for their numerous benefits, which can be helpful to design a universal platform for detection of future emerging pathogenic viruses.
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Affiliation(s)
- Yasin Orooji
- College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
- Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210037 People’s Republic of China
| | - Hessamaddin Sohrabi
- Department of Analytical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, 51666-16471 Iran
| | - Nima Hemmat
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Fatemeh Oroojalian
- Department of Advanced Sciences and Technologies in Medicine, School of Medicine, North Khorasan University of Medical Sciences, Bojnurd, Iran
| | - Behzad Baradaran
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ahad Mokhtarzadeh
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohamad Mohaghegh
- Department of Nanobiotechnology, School of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Hassan Karimi-Maleh
- Department of Chemical Engineering, Laboratory of Nanotechnology, Quchan University of Technology, Quchan, Islamic Republic of Iran
- School of Resources and Environment, University of Electronic Science and Technology of China, Xiyuan Ave, Chengdu, 611731 People’s Republic of China
- Department of Chemical Sciences, University of Johannesburg, Doornfontein Campus, PO Box 17011, Johannesburg, 2028 South Africa
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12
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Immunoassays on thiol-ene synthetic paper generate a superior fluorescence signal. Biosens Bioelectron 2020; 163:112279. [PMID: 32421629 DOI: 10.1016/j.bios.2020.112279] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 05/05/2020] [Indexed: 11/23/2022]
Abstract
The fluorescence-based detection of biological complexes on solid substrates is widely used in microarrays and lateral flow tests. Here, we investigate thiol-ene micropillar scaffold sheets ("synthetic paper") as the solid substrate in such assays. Compared to state-of-the-art glass and nitrocellulose substrates, assays on synthetic paper provide a stronger fluorescence signal, similar or better reproducibility, lower limit of detection (LOD), and the possibility of working with lower immunoreagent concentrations. Using synthetic paper, we detected the antibiotic enrofloxacin in whole milk with a LOD of 1.64 nM, which is on par or better than the values obtained with other common tests, and much lower than the maximum level allowed by European Union regulations. The significance of these results lays in that they indicate that synthetically-derived microstructured substrate materials have the potential to improve the performance of diagnostic assays.
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13
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Guo W, Hansson J, van der Wijngaart W. Synthetic Paper Separates Plasma from Whole Blood with Low Protein Loss. Anal Chem 2020; 92:6194-6199. [DOI: 10.1021/acs.analchem.0c01474] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Weijin Guo
- KTH Royal Institute of Technology, Micro and Nanosystems, Malvina’s väg 10, 100 44 Stockholm, Sweden
| | - Jonas Hansson
- Mercene Labs AB, Teknikringen 38A, 114 28 Stockholm, Sweden
| | - Wouter van der Wijngaart
- KTH Royal Institute of Technology, Micro and Nanosystems, Malvina’s väg 10, 100 44 Stockholm, Sweden
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14
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Geissler M, Malic L, Morton KJ, Clime L, Daoud J, Hernández-Castro JA, Corneau N, Blais BW, Veres T. Polymer Micropillar Arrays for Colorimetric DNA Detection. Anal Chem 2020; 92:7738-7745. [DOI: 10.1021/acs.analchem.0c00830] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthias Geissler
- Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, Quebec J4B 6Y4, Canada
| | - Lidija Malic
- Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, Quebec J4B 6Y4, Canada
| | - Keith J. Morton
- Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, Quebec J4B 6Y4, Canada
| | - Liviu Clime
- Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, Quebec J4B 6Y4, Canada
| | - Jamal Daoud
- Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, Quebec J4B 6Y4, Canada
| | - Javier A. Hernández-Castro
- Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, Quebec J4B 6Y4, Canada
| | - Nathalie Corneau
- Health Canada, Bureau of Microbial Hazards, 251 Sir Frederick Banting Driveway, Ottawa, Ontario K1A 0K9, Canada
| | - Burton W. Blais
- Ontario Laboratory Network, Canadian Food Inspection Agency, Building 22, 960 Carling Avenue, Ottawa, Ontario K1A 0C6, Canada
| | - Teodor Veres
- Life Sciences Division, National Research Council of Canada, 75 de Mortagne Boulevard, Boucherville, Quebec J4B 6Y4, Canada
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15
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Sticker D, Geczy R, Häfeli UO, Kutter JP. Thiol-Ene Based Polymers as Versatile Materials for Microfluidic Devices for Life Sciences Applications. ACS APPLIED MATERIALS & INTERFACES 2020; 12:10080-10095. [PMID: 32048822 DOI: 10.1021/acsami.9b22050] [Citation(s) in RCA: 54] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
While there is a steady growth in the number of microfluidics applications, the search for an optimal material that delivers the diverse characteristics needed for the numerous tasks is still nowhere close to being settled. Often overlooked and still underrepresented, the thiol-ene family of polymer materials has an enormous potential for applications in organs-on-a-chip, droplet productions, microanalytics, and point of care testing. In this review, the main characteristics of the thiol-ene materials are given, and advantages and drawbacks with respect to their potential in microfluidic chip fabrication are critically assessed. Select applications, which exploit the versatility of the thiol-ene polymers, are presented and discussed. It is concluded that, in particular, the rapid prototyping possibility combined with the material's resulting mechanical strength, solvent resistance, and biocompatibility, as well as the inherently easy surface functionalization, are strong factors to make thiol-ene polymers strong contenders for promising future materials for many biological, clinical, and technical lab-on-a-chip applications.
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Affiliation(s)
- Drago Sticker
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Reka Geczy
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Urs O Häfeli
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
- Faculty of Pharmaceutical Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Jörg P Kutter
- Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
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16
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Xiao Q, Xu C. Research progress on chemiluminescence immunoassay combined with novel technologies. Trends Analyt Chem 2020. [DOI: 10.1016/j.trac.2019.115780] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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17
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Liu Y, Shangguan JW, Xu BY, Yu XD, Xu JJ, Chen HY. Abnormal Liquid Chasing Effect in Paper Capillary Enables Versatile Gradient Generation on Microfluidic Paper Analytical Devices. Anal Chem 2020; 92:2722-2730. [DOI: 10.1021/acs.analchem.9b04934] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yu Liu
- State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Jin-Wen Shangguan
- State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Bi-Yi Xu
- State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
- School of Engineering and Applied Sciences, Department of Physics, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Xiao-Dong Yu
- State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Jing-Juan Xu
- State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Hong-Yuan Chen
- State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
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18
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Yada S, Bagheri S, Hansson J, Do-Quang M, Lundell F, van der Wijngaart W, Amberg G. Droplet leaping governs microstructured surface wetting. SOFT MATTER 2019; 15:9528-9536. [PMID: 31720679 DOI: 10.1039/c9sm01854a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Microstructured surfaces that control the direction of liquid transport are not only ubiquitous in nature, but they are also central to technological processes such as fog/water harvesting, oil-water separation, and surface lubrication. However, a fundamental understanding of the initial wetting dynamics of liquids spreading on such surfaces is lacking. Here, we show that three regimes govern microstructured surface wetting on short time scales: spread, stick, and contact line leaping. The latter involves establishing a new contact line downstream of the wetting front as the liquid leaps over specific sections of the solid surface. Experimental and numerical investigations reveal how different regimes emerge in different flow directions during wetting of periodic asymmetrically microstructured surfaces. These insights improve our understanding of rapid wetting in droplet impact, splashing, and wetting of vibrating surfaces and may contribute to advances in designing structured surfaces for the mentioned applications.
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Affiliation(s)
- Susumu Yada
- Department of Mechanics, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
| | - Shervin Bagheri
- Department of Mechanics, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
| | - Jonas Hansson
- Division of Micro and Nanosystems, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden
| | - Minh Do-Quang
- Department of Mechanics, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
| | - Fredrik Lundell
- Department of Mechanics, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden.
| | | | - Gustav Amberg
- Department of Mechanics, KTH Royal Institute of Technology, 100 44 Stockholm, Sweden. and Södertorn University, Stockholm, Sweden
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19
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Al-Azawi A, Cenev Z, Tupasela T, Peng B, Ikkala O, Zhou Q, Jokinen V, Franssila S, Ras RHA. Tunable and Magnetic Thiol-ene Micropillar Arrays. Macromol Rapid Commun 2019; 41:e1900522. [PMID: 31778287 DOI: 10.1002/marc.201900522] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 10/26/2019] [Indexed: 11/05/2022]
Abstract
Tunable and responsive surfaces offer routes to multiple functionalities ranging from superhydrophobic surfaces to controlled adhesion. Inspired by cilia structure in the respiratory pathway, magnetically responsive periodic arrays of flexible and magnetic thiol-ene micropillars are fabricated. Omnidirectional collective bending of the pillar array in magnetic field is shown. Local non-contact actuation of a single pillar is achieved using an electromagnetic needle to probe the responsiveness and the elastic properties of the pillars by comparing the effect of thiol-ene crosslinking density to pillar bending. The suitable thiol-ene components for flexible and stiff magnetic micropillars and the workable range of thiol-to-allyl ratio are identified. The wettability of the magnetic pillars can be tailored by chemical and topography modification of the pillar surface. Low-surface-energy self-assembled monolayers are grafted by UV-assisted surface activation, which is also used for surface topography modification by covalent bonding of micro- and nanoparticles to the pillar surface. The modified thiol-ene micopillars are resistant to capillarity-driven collapse and they exhibit low contact angle hysteresis, allowing water droplet motion driven by repeated bending and recovery of the magnetic pillars in an external magnetic field. Transport of polyethylene microspheres is also demonstrated.
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Affiliation(s)
- Anas Al-Azawi
- Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076, Aalto, Espoo, Finland
| | - Zoran Cenev
- Department of Electrical Engineering and Automation, P.O. Box 15500, FI-00076, Aalto, Espoo, Finland
| | - Topi Tupasela
- Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076, Aalto, Espoo, Finland
| | - Bo Peng
- Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076, Aalto, Espoo, Finland
| | - Olli Ikkala
- Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076, Aalto, Espoo, Finland.,Department of Bioproducts and Biosystems, Aalto University, P.O. Box 15100, FI-00076, Aalto, Espoo, Finland
| | - Quan Zhou
- Department of Electrical Engineering and Automation, P.O. Box 15500, FI-00076, Aalto, Espoo, Finland
| | - Ville Jokinen
- Department of Chemistry and Materials Science, Aalto University, P.O. Box 13500, FI-00076, Aalto, Espoo, Finland
| | - Sami Franssila
- Department of Chemistry and Materials Science, Aalto University, P.O. Box 13500, FI-00076, Aalto, Espoo, Finland
| | - Robin H A Ras
- Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076, Aalto, Espoo, Finland.,Department of Bioproducts and Biosystems, Aalto University, P.O. Box 15100, FI-00076, Aalto, Espoo, Finland
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20
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Gao B, Yang Y, Liao J, He B, Liu H. Bioinspired multistructured paper microfluidics for POCT. LAB ON A CHIP 2019; 19:3602-3608. [PMID: 31588449 DOI: 10.1039/c9lc00907h] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The rapid development of and the large market for medical diagnostics necessitate point-of-care testing (POCT) with superior sensitivity, miniaturization, multiple functionalities and high integration. Thus, flexible substrates with complex structures that provide multiple functions are in demand. Herein, we present multistructured pseudo-papers (MSPs) as a platform for building flexible microfluidics. Flexible and freestanding MSPs are generated by the self-assembly of colloidal silica crystals or core-shell copolymer elastic colloidal crystals on microcavity PDMS molds to form photonic crystals (PCs). Nitrocellulose (NC) multistructured pseudo-papers (NC MSPs) were obtained by etching SiO2 PCs after NC precursor infiltration, while elastic copolymer (EC) multistructured pseudo-papers (EC MSPs) were directly peeled off the mold; both types of freestanding MSPs have ordered micropillars and nanocrystal structures and presented unique properties such as pumpless liquid transport and fluorescence and chemiluminescence (CL) enhancement. MSPs with designed patterns were fabricated by patterned PDMS molds, and complicated microfluidic chips were used to generate MSPs by utilizing these patterns as liquid channels. The MSPs were used for fabricating microfluidic sensors for human cardiac marker and cancer marker sensing; the features of these bioinspired MSPs indicate their potential for sensitive sensing, which will enable them to find broader applications in many fields.
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Affiliation(s)
- Bingbing Gao
- School of Pharmaceutical Sciences and School of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China.
| | - Yaqiong Yang
- School of Pharmaceutical Sciences and School of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China.
| | - Junlong Liao
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China.
| | - Bingfang He
- School of Pharmaceutical Sciences and School of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China.
| | - Hong Liu
- State Key Laboratory of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, 210096, China.
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21
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Kumar P, Agrawal P, Chatterjee K. Challenges and opportunities in blood flow through porous substrate: A design and interface perspective of dried blood spot. J Pharm Biomed Anal 2019; 175:112772. [DOI: 10.1016/j.jpba.2019.07.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 07/09/2019] [Accepted: 07/10/2019] [Indexed: 12/13/2022]
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22
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Immobilization of proteolytic enzymes on replica-molded thiol-ene micropillar reactors via thiol-gold interaction. Anal Bioanal Chem 2019; 411:2339-2349. [PMID: 30899997 PMCID: PMC6459972 DOI: 10.1007/s00216-019-01674-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 01/29/2019] [Accepted: 02/05/2019] [Indexed: 12/17/2022]
Abstract
We introduce rapid replica molding of ordered, high-aspect-ratio, thiol-ene micropillar arrays for implementation of microfluidic immobilized enzyme reactors (IMERs). By exploiting the abundance of free surface thiols of off-stoichiometric thiol-ene compositions, we were able to functionalize the native thiol-ene micropillars with gold nanoparticles (GNPs) and these with proteolytic α-chymotrypsin (CHT) via thiol-gold interaction. The micropillar arrays were replicated via PDMS soft lithography, which facilitated thiol-ene curing without the photoinitiators, and thus straightforward bonding and good control over the surface chemistry (number of free surface thiols). The specificity of thiol-gold interaction was demonstrated over allyl-rich thiol-ene surfaces and the robustness of the CHT-IMERs at different flow rates and reaction temperatures using bradykinin hydrolysis as the model reaction. The product conversion rate was shown to increase as a function of decreasing flow rate (increasing residence time) and upon heating of the IMER to physiological temperature. Owing to the effective enzyme immobilization onto the micropillar array by GNPs, no further purification of the reaction solution was required prior to mass spectrometric detection of the bradykinin hydrolysis products and no clogging problems, commonly associated with conventional capillary packings, were observed. The activity of the IMER remained stable for at least 1.5 h (continuous use), suggesting that the developed protocol may provide a robust, new approach to implementation of IMER technology for proteomics research. Graphical abstract.
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23
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Kamiya H, Ota T, Yasuga H, Miki N. A Precise Sampling Strip with Microstructures. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2018; 2018:3837-3840. [PMID: 30441201 DOI: 10.1109/embc.2018.8513267] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
This paper presents a precise sampling microstructure formed as a paper strip. We have been developing dialysis system that can be implanted into a human body as an artificial kidney. For the safe use of our artificial kidney, the patients' urine needs to be constantly monitored to detect the abnormal value of ion concentration essential for human life. We are conceiving the monitoring system based on sampling by a paper strip. In this study, we fabricated the strip consisting of slanted and interlocked micropillars for the sampling, known as synthetic microfluidic paper. The paper-like substrate can be fabricated with a well-controlled geometry and subsequently enables precise sampling. Through the conducted experiments, it was shown that synthetic microfluidic paper had better mechanical properties, showed more precision in sampling than paper filter as well as corresponding liquid holding capability to the paper filter. Our proposed paper-based sampling system is expected to lead to the development of minimally invasive ion monitoring system with quantitative sampling strip.
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24
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Casals‐Terré J, Farré‐Lladós J, Zuñiga A, Roncero MB, Vidal T. Novel applications of nonwood cellulose for blood typing assays. J Biomed Mater Res B Appl Biomater 2018; 107:1533-1541. [DOI: 10.1002/jbm.b.34245] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 08/10/2018] [Accepted: 08/18/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Jasmina Casals‐Terré
- Mechanical Engineering Department, MicroTech LabTechnical University of Catalonia Terrassa Spain
| | - Josep Farré‐Lladós
- Mechanical Engineering Department, MicroTech LabTechnical University of Catalonia Terrassa Spain
| | - Allinson. Zuñiga
- Mechanical Engineering Department, MicroTech LabTechnical University of Catalonia Terrassa Spain
- CELBIOTECH Paper Engineering Research GroupTechnical University of Catalonia Terrassa Spain
| | - Maria Blanca Roncero
- CELBIOTECH Paper Engineering Research GroupTechnical University of Catalonia Terrassa Spain
| | - Teresa Vidal
- CELBIOTECH Paper Engineering Research GroupTechnical University of Catalonia Terrassa Spain
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25
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Olanrewaju A, Beaugrand M, Yafia M, Juncker D. Capillary microfluidics in microchannels: from microfluidic networks to capillaric circuits. LAB ON A CHIP 2018; 18:2323-2347. [PMID: 30010168 DOI: 10.1039/c8lc00458g] [Citation(s) in RCA: 149] [Impact Index Per Article: 24.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Microfluidics offer economy of reagents, rapid liquid delivery, and potential for automation of many reactions, but often require peripheral equipment for flow control. Capillary microfluidics can deliver liquids in a pre-programmed manner without peripheral equipment by exploiting surface tension effects encoded by the geometry and surface chemistry of a microchannel. Here, we review the history and progress of microchannel-based capillary microfluidics spanning over three decades. To both reflect recent experimental and conceptual progress, and distinguish from paper-based capillary microfluidics, we adopt the more recent terminology of capillaric circuits (CCs). We identify three distinct waves of development driven by microfabrication technologies starting with early implementations in industry using machining and lamination, followed by development in the context of micro total analysis systems (μTAS) and lab-on-a-chip devices using cleanroom microfabrication, and finally a third wave that arose with advances in rapid prototyping technologies. We discuss the basic physical laws governing capillary flow, deconstruct CCs into basic circuit elements including capillary pumps, stop valves, trigger valves, retention valves, and so on, and describe their operating principle and limitations. We discuss applications of CCs starting with the most common usage in automating liquid delivery steps for immunoassays, and highlight emerging applications such as DNA analysis. Finally, we highlight recent developments in rapid prototyping of CCs and the benefits offered including speed, low cost, and greater degrees of freedom in CC design. The combination of better analytical models and lower entry barriers (thanks to advances in rapid manufacturing) make CCs both a fertile research area and an increasingly capable technology for user-friendly and high-performance laboratory and diagnostic tests.
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Affiliation(s)
- Ayokunle Olanrewaju
- Biomedical Engineering Department, McGill University, Genome Quebec and McGill University Innovation Centre, Canada.
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26
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Wang P, Kricka LJ. Current and Emerging Trends in Point-of-Care Technology and Strategies for Clinical Validation and Implementation. Clin Chem 2018; 64:1439-1452. [PMID: 29884677 DOI: 10.1373/clinchem.2018.287052] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 05/11/2018] [Indexed: 12/14/2022]
Abstract
BACKGROUND Point-of-care technology (POCT) provides actionable information at the site of care to allow rapid clinical decision-making. With healthcare emphasis shifting toward precision medicine, population health, and chronic disease management, the potential impact of POCT continues to grow, and several prominent POCT trends have emerged or strengthened in the last decade. CONTENT This review summarizes current and emerging trends in POCT, including technologies approved or cleared by the Food and Drug Administration or in development. Technologies included have either impacted existing clinical diagnostics applications (e.g., continuous monitoring and targeted nucleic acid testing) or are likely to impact diagnostics delivery in the near future. The focus is limited to in vitro diagnostics applications, although in some sections, technologies beyond in vitro diagnostics are also included given the commonalities (e.g., ultrasound plug-ins for smart phones). For technologies in development (e.g., wearables, noninvasive testing, mass spectrometry and nuclear magnetic resonance, paper-based diagnostics, nanopore-based devices, and digital microfluidics), we also discuss their potential clinical applications and provide perspectives on strategies beyond technological and analytical proof of concept, with the end goal of clinical implementation and impact. SUMMARY The field of POCT has witnessed strong growth over the past decade, as evidenced by new clinical or consumer products or research and development directions. Combined with the appropriate strategies for clinical needs assessment, validation, and implementation, these and future POCTs may significantly impact care delivery and associated outcomes and costs.
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Affiliation(s)
- Ping Wang
- William Pepper Laboratory, University of Pennsylvania Heath System, and the Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA.
| | - Larry J Kricka
- William Pepper Laboratory, University of Pennsylvania Heath System, and the Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA
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27
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Zong D, Yang Z, Duan Y. Dynamic Spreading of Droplets on Lyophilic Micropillar-Arrayed Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:4417-4425. [PMID: 29547295 DOI: 10.1021/acs.langmuir.7b04358] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The wetting kinetics of droplets on lyophilic pillar-arrayed substrates is the driving mechanism of several natural phenomena (e.g., insect capturing by Nepenthes) and many industrial technologies (e.g., gas-liquid separation). For a lyophilic pillar-arrayed surface, a fringe film is formed ahead of the contact line, resulting in distinct wetting kinetics, which needs further investigation. In this study, Si(100) substrates with square micropillars were used to investigate the early spreading of droplets on lyophilic pillar-arrayed surfaces through the droplet-spreading method. A fringe film was observed ahead of the contact line for micropillar-arrayed surfaces. The spreading radius was enhanced by micropillars and mainly caused by liquid penetration into the pillar forest, resulting in alteration of the dissipation mechanism. The early spreading of droplets on lyophilic micropillar-arrayed surface was affected only by the solid fraction and independent of the pillar height. A semitheoretical model without adjustable parameters was established on the basis of the global energetic equation, considering the local dissipation, viscous dissipation, and the dissipation in the precursor film. The prediction of the model agrees with the experimental results. Our semitheoretical model may aid in predicting the wetting kinetics on lyophilic pillar-arrayed substrates and assist the design of pillar-arrayed surfaces in practical applications.
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Affiliation(s)
- Diyuan Zong
- Key Laboratory for Thermal Science and Power Engineering of MOE , Tsinghua University , Beijing 100084 , P. R. China
| | - Zhen Yang
- Key Laboratory for Thermal Science and Power Engineering of MOE , Tsinghua University , Beijing 100084 , P. R. China
| | - Yuanyuan Duan
- Key Laboratory for Thermal Science and Power Engineering of MOE , Tsinghua University , Beijing 100084 , P. R. China
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28
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Guo W, Hansson J, van der Wijngaart W. Capillary pumping independent of the liquid surface energy and viscosity. MICROSYSTEMS & NANOENGINEERING 2018; 4:2. [PMID: 31057892 PMCID: PMC6220164 DOI: 10.1038/s41378-018-0002-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 12/08/2017] [Accepted: 12/14/2017] [Indexed: 05/24/2023]
Abstract
Capillary pumping is an attractive means of liquid actuation because it is a passive mechanism, i.e., it does not rely on an external energy supply during operation. The capillary flow rate generally depends on the liquid sample viscosity and surface energy. This poses a problem for capillary-driven systems that rely on a predictable flow rate and for which the sample viscosity or surface energy are not precisely known. Here, we introduce the capillary pumping of sample liquids with a flow rate that is constant in time and independent of the sample viscosity and sample surface energy. These features are enabled by a design in which a well-characterized pump liquid is capillarily imbibed into the downstream section of the pump and thereby pulls the unknown sample liquid into the upstream pump section. The downstream pump geometry is designed to exert a Laplace pressure and fluidic resistance that are substantially larger than those exerted by the upstream pump geometry on the sample liquid. Hence, the influence of the unknown sample liquid on the flow rate is negligible. We experimentally tested pumps of the new design with a variety of sample liquids, including water, different samples of whole blood, different samples of urine, isopropanol, mineral oil, and glycerol. The capillary filling speeds of these liquids vary by more than a factor 1000 when imbibed to a standard constant cross-section glass capillary. In our new pump design, 20 filling tests involving these liquid samples with vastly different properties resulted in a constant volumetric flow rate in the range of 20.96-24.76 μL/min. We expect this novel capillary design to have immediate applications in lab-on-a-chip systems and diagnostic devices.
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Affiliation(s)
- Weijin Guo
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, Stockholm, 100 44 Sweden
| | - Jonas Hansson
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, Stockholm, 100 44 Sweden
| | - Wouter van der Wijngaart
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, Stockholm, 100 44 Sweden
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29
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Li Q, Dhakal R, Kim J. Microdroplet-based On-Demand Drawing of High Aspect-Ratio Elastomeric Micropillar and Its Contact Sensing Application. Sci Rep 2017; 7:17009. [PMID: 29209022 PMCID: PMC5717269 DOI: 10.1038/s41598-017-17230-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 11/16/2017] [Indexed: 11/10/2022] Open
Abstract
High aspect-ratio elastomeric micropillars play important roles as the platform for microscale sensing and actuation. Many soft-lithographic techniques have been developed for their facile realization but most of the techniques are limited to build the micropillars only on totally flat, widely accessible substrate areas with the micropillar’s structural characteristics completely predetermined, leaving little room for in situ control. Here we demonstrate a new technique which overcomes these limitations by directly drawing micropillars from pipette-dispensed PDMS microdroplets using vacuum-chucked microspheres. The combined utilization of PDMS microdroplets and microspheres not only enables the realization of microsphere-tipped PDMS micropillars on non-flat, highly space-constrained substrate areas at in situ controllable heights but also allows arraying of micropillars with dissimilar heights at a close proximity. To validate the new technique’s utility and versatility, we realize PDMS micropillars on various unconventional substrate areas in various configurations. We also convert one of them, the optical fiber/micropillar hybrid, into a soft optical contact sensor. Both the fabrication technique and the resulting sensing scheme will be useful for future biomedical microsystems.
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Affiliation(s)
- Qiang Li
- Department of Electrical and Computer Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Rabin Dhakal
- Department of Electrical and Computer Engineering, Iowa State University, Ames, IA, 50011, USA
| | - Jaeyoun Kim
- Department of Electrical and Computer Engineering, Iowa State University, Ames, IA, 50011, USA.
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30
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Saeed AFUH, Wang R, Ling S, Wang S. Antibody Engineering for Pursuing a Healthier Future. Front Microbiol 2017; 8:495. [PMID: 28400756 PMCID: PMC5368232 DOI: 10.3389/fmicb.2017.00495] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 03/09/2017] [Indexed: 12/21/2022] Open
Abstract
Since the development of antibody-production techniques, a number of immunoglobulins have been developed on a large scale using conventional methods. Hybridoma technology opened a new horizon in the production of antibodies against target antigens of infectious pathogens, malignant diseases including autoimmune disorders, and numerous potent toxins. However, these clinical humanized or chimeric murine antibodies have several limitations and complexities. Therefore, to overcome these difficulties, recent advances in genetic engineering techniques and phage display technique have allowed the production of highly specific recombinant antibodies. These engineered antibodies have been constructed in the hunt for novel therapeutic drugs equipped with enhanced immunoprotective abilities, such as engaging immune effector functions, effective development of fusion proteins, efficient tumor and tissue penetration, and high-affinity antibodies directed against conserved targets. Advanced antibody engineering techniques have extensive applications in the fields of immunology, biotechnology, diagnostics, and therapeutic medicines. However, there is limited knowledge regarding dynamic antibody development approaches. Therefore, this review extends beyond our understanding of conventional polyclonal and monoclonal antibodies. Furthermore, recent advances in antibody engineering techniques together with antibody fragments, display technologies, immunomodulation, and broad applications of antibodies are discussed to enhance innovative antibody production in pursuit of a healthier future for humans.
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Affiliation(s)
- Abdullah F U H Saeed
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, and School of Life Sciences, Fujian Agriculture and Forestry University Fuzhou, China
| | - Rongzhi Wang
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, and School of Life Sciences, Fujian Agriculture and Forestry University Fuzhou, China
| | - Sumei Ling
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, and School of Life Sciences, Fujian Agriculture and Forestry University Fuzhou, China
| | - Shihua Wang
- Key Laboratory of Pathogenic Fungi and Mycotoxins of Fujian Province, Key Laboratory of Biopesticide and Chemical Biology of Education Ministry, and School of Life Sciences, Fujian Agriculture and Forestry University Fuzhou, China
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Abstract
The current state of screening methods for drug discovery is still riddled with several inefficiencies. Although some widely used high-throughput screening platforms may enhance the drug screening process, their cost and oversimplification of cell-drug interactions pose a translational difficulty. Microfluidic cell-chips resolve many issues found in conventional HTS technology, providing benefits such as reduced sample quantity and integration of 3D cell culture physically more representative of the physiological/pathological microenvironment. In this review, we introduce the advantages of microfluidic devices in drug screening, and outline the critical factors which influence device design, highlighting recent innovations and advances in the field including a summary of commercialization efforts on microfluidic cell chips. Future perspectives of microfluidic cell devices are also provided based on considerations of present technological limitations and translational barriers.
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Hillmering M, Pardon G, Vastesson A, Supekar O, Carlborg CF, Brandner BD, van der Wijngaart W, Haraldsson T. Off-stoichiometry improves the photostructuring of thiol-enes through diffusion-induced monomer depletion. MICROSYSTEMS & NANOENGINEERING 2016; 2:15043. [PMID: 31057810 PMCID: PMC6444721 DOI: 10.1038/micronano.2015.43] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 11/19/2015] [Accepted: 11/19/2015] [Indexed: 05/29/2023]
Abstract
Thiol-enes are a group of alternating copolymers with highly ordered networks and are used in a wide range of applications. Here, "click" chemistry photostructuring in off-stoichiometric thiol-enes is shown to induce microscale polymeric compositional gradients due to species diffusion between non-illuminated and illuminated regions, creating two narrow zones with distinct compositions on either side of the photomask feature boundary: a densely cross-linked zone in the illuminated region and a zone with an unpolymerized highly off-stoichiometric monomer composition in the non-illuminated region. Using confocal Raman microscopy, it is here explained how species diffusion causes such intricate compositional gradients in the polymer and how off-stoichiometry results in improved image transfer accuracy in thiol-ene photostructuring. Furthermore, increasing the functional group off-stoichiometry and decreasing the photomask feature size is shown to amplify the induced gradients, which potentially leads to a new methodology for microstructuring.
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Affiliation(s)
- Mikael Hillmering
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, SE-10044, Stockholm, Sweden
| | - Gaspard Pardon
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, SE-10044, Stockholm, Sweden
| | - Alexander Vastesson
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, SE-10044, Stockholm, Sweden
| | - Omkar Supekar
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, SE-10044, Stockholm, Sweden
| | - Carl Fredrik Carlborg
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, SE-10044, Stockholm, Sweden
| | - Birgit D. Brandner
- SP Chemistry, Materials and Surfaces, SP Technical Research Institute of Sweden, Drottning Kristinas väg 45, SE-114 28, Stockholm, Sweden
| | - Wouter van der Wijngaart
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, SE-10044, Stockholm, Sweden
| | - Tommy Haraldsson
- Micro and Nanosystems, KTH Royal Institute of Technology, Osquldas väg 10, SE-10044, Stockholm, Sweden
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