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Dubois C, Ducas É, Laforce-Lavoie A, Robidoux J, Delorme A, Live LS, Brouard D, Masson JF. A portable surface plasmon resonance (SPR) sensor for the detection of immunoglobulin A in plasma. Transfusion 2024; 64:881-892. [PMID: 38591151 DOI: 10.1111/trf.17818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Revised: 03/05/2024] [Accepted: 03/20/2024] [Indexed: 04/10/2024]
Abstract
BACKGROUND A life-threatening anaphylactic shock can occur if a patient with undiagnosed immunoglobulin A (IgA) deficiency (i.e., IgA levels <500 ng/mL) receives IgA-containing blood, hence the need for a rapid, point-of-care (POC) method for IgA deficiency screening. Enzyme-linked immunosorbent assay (ELISA) is routinely used to detect IgA, but this method requires trained specialists and ≥24 h to obtain a result. We developed a surface plasmon resonance (SPR)-based protocol to identify IgA-deficient patients or donors within 1 h. MATERIALS AND METHODS The SPR sensor relies on the detection of IgAs captured by primary antibodies adsorbed on the SPR chip and quantified with secondary antibodies. The sensor was calibrated from 0 to 2000 ng/mL in buffer, IgA-depleted human serum, and plasma samples from IgA-deficient individuals. A critical concentration of 500 ng/mL was set for IgA deficiency. The optimized sensor was then tested on eight plasma samples with known IgA status (determined by ELISA), including five with IgA deficiency and three with normal IgA levels. RESULTS The limit of detection was estimated at 30 ng/mL in buffer and 400 ng/mL in diluted plasma. The results obtained fully agreed with ELISA among the eight plasma samples tested. The protocol distinguished IgA-deficient from normal samples, even for samples with an IgA concentration closer to critical concentration. DISCUSSION In conclusion, we developed a reliable POC assay for the quantification of IgA in plasma. This test may permit POC testing at blood drives and centralized centers to maintain reserves of IgA-deficient blood and in-hospital testing of blood recipients.
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Affiliation(s)
- Caroline Dubois
- Département de Chimie, Quebec Center for Advanced Materials, Regroupement Québécois sur les Matériaux de Pointe, and Centre Interdisciplinaire de Recherche sur le Cerveau et l'Apprentissage, Institut Courtois, Université de Montréal, Montréal, Canada
| | - Éric Ducas
- Héma-Québec, Affaires Médicales et Innovation, Québec City, Québec, Canada
| | | | - Jonathan Robidoux
- Héma-Québec, Affaires Médicales et Innovation, Québec City, Québec, Canada
| | - Alexandre Delorme
- Département de Chimie, Quebec Center for Advanced Materials, Regroupement Québécois sur les Matériaux de Pointe, and Centre Interdisciplinaire de Recherche sur le Cerveau et l'Apprentissage, Institut Courtois, Université de Montréal, Montréal, Canada
| | | | - Danny Brouard
- Héma-Québec, Affaires Médicales et Innovation, Québec City, Québec, Canada
| | - Jean-François Masson
- Département de Chimie, Quebec Center for Advanced Materials, Regroupement Québécois sur les Matériaux de Pointe, and Centre Interdisciplinaire de Recherche sur le Cerveau et l'Apprentissage, Institut Courtois, Université de Montréal, Montréal, Canada
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Johannsen B, Baumgartner D, Karkossa L, Paust N, Karpíšek M, Bostanci N, Zengerle R, Mitsakakis K. ImmunoDisk—A Fully Automated Bead-Based Immunoassay Cartridge with All Reagents Pre-Stored. BIOSENSORS 2022; 12:bios12060413. [PMID: 35735560 PMCID: PMC9221266 DOI: 10.3390/bios12060413] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 05/31/2022] [Accepted: 06/07/2022] [Indexed: 11/16/2022]
Abstract
In this paper, we present the ImmunoDisk, a fully automated sample-to-answer centrifugal microfluidic cartridge, integrating a heterogeneous, wash-free, magnetic- and fluorescent bead-based immunoassay (bound-free phase detection immunoassay/BFPD-IA). The BFPD-IA allows the implementation of a simple fluidic structure, where the assay incubation, bead separation and detection are performed in the same chamber. The system was characterized using a C-reactive protein (CRP) competitive immunoassay. A parametric investigation on air drying of protein-coupled beads for pre-storage at room temperature is presented. The key parameters were buffer composition, drying temperature and duration. A protocol for drying two different types of protein-coupled beads with the same temperature and duration using different drying buffers is presented. The sample-to-answer workflow was demonstrated measuring CRP in 5 µL of human serum, without prior dilution, utilizing only one incubation step, in 20 min turnaround time, in the clinically relevant concentration range of 15–115 mg/L. A reproducibility assessment over three disk batches revealed an average signal coefficient of variation (CV) of 5.8 ± 1.3%. A CRP certified reference material was used for method verification with a concentration CV of 8.6%. Our results encourage future testing of the CRP-ImmunoDisk in clinical studies and its point-of-care implementation in many diagnostic applications.
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Affiliation(s)
- Benita Johannsen
- Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany; (L.K.); (N.P.); (R.Z.)
- Correspondence: (B.J.); (K.M.); Tel.: +49-761-203-7252 (B.J.); +49-761-203-73252 (K.M.)
| | - Desirée Baumgartner
- Laboratory for MEMS Applications, IMTEK—Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany;
| | - Lena Karkossa
- Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany; (L.K.); (N.P.); (R.Z.)
| | - Nils Paust
- Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany; (L.K.); (N.P.); (R.Z.)
- Laboratory for MEMS Applications, IMTEK—Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany;
| | - Michal Karpíšek
- BioVendor-Laboratorní Medicína a.s., Research & Diagnostic Products Division, Karasek 1767/1, Reckovice, 62100 Brno, Czech Republic;
- Faculty of Pharmacy, Masaryk University, Palackeho trida 1946/1, 61242 Brno, Czech Republic
| | - Nagihan Bostanci
- Section of Oral Health and Periodontology, Division of Oral Diseases, Department of Dental Medicine, Karolinska Institutet, 14104 Huddinge, Sweden;
| | - Roland Zengerle
- Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany; (L.K.); (N.P.); (R.Z.)
- Laboratory for MEMS Applications, IMTEK—Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany;
| | - Konstantinos Mitsakakis
- Hahn-Schickard, Georges-Koehler-Allee 103, 79110 Freiburg, Germany; (L.K.); (N.P.); (R.Z.)
- Laboratory for MEMS Applications, IMTEK—Department of Microsystems Engineering, University of Freiburg, Georges-Koehler-Allee 103, 79110 Freiburg, Germany;
- Correspondence: (B.J.); (K.M.); Tel.: +49-761-203-7252 (B.J.); +49-761-203-73252 (K.M.)
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3
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Abstract
Lab-on-a-Disc (LoaD) biosensors are increasingly a promising solution for many biosensing applications. In the search for a perfect match between point-of-care (PoC) microfluidic devices and biosensors, the LoaD platform has the potential to be reliable, sensitive, low-cost, and easy-to-use. The present global pandemic draws attention to the importance of rapid sample-to-answer PoC devices for minimising manual intervention and sample manipulation, thus increasing the safety of the health professional while minimising the chances of sample contamination. A biosensor is defined by its ability to measure an analyte by converting a biological binding event to tangible analytical data. With evolving manufacturing processes for both LoaDs and biosensors, it is becoming more feasible to embed biosensors within the platform and/or to pair the microfluidic cartridges with low-cost detection systems. This review considers the basics of the centrifugal microfluidics and describes recent developments in common biosensing methods and novel technologies for fluidic control and automation. Finally, an overview of current devices on the market is provided. This review will guide scientists who want to initiate research in LoaD PoC devices as well as providing valuable reference material to researchers active in the field.
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Osaki S, Wakida SI, Saito M, Tamiya E. Towards On-site Determination of Secretory IgA in Artificial Saliva with Gold-Linked Electrochemical Immunoassay (GLEIA) Using Portable Potentiostat and Disposable Printed Electrode. Appl Biochem Biotechnol 2020; 193:1311-1320. [PMID: 32535815 DOI: 10.1007/s12010-020-03332-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Accepted: 04/23/2020] [Indexed: 11/24/2022]
Abstract
Mental stress is closely connected with our physical and mental wellness. Therefore, stress measurement can contribute to assess our lifestyle and increase our quality of life. In this paper, we detect the secretory immunoglobulin A (sIgA), which is the candidate of salivary stress markers, with original electrochemical immunoassay: gold-linked electrochemical immunoassay (GLEIA). This biosensor is based on a sandwich-type immunosensor and adopts the electrochemical method to detect the reduction peak from Au nanoparticles linked to the secondary antibody. GLEIA is convenient and cost-effective that only requires a low sample volume (10 μL). In addition, the GLEIA show high sensitivity and selectivity. We obtained the linear response to relate the concentration of sIgA (10-300 ng/mL) in D-PBS buffer with the artificial saliva which includes salivary inorganic salt and typically glycoprotein (mucin). Furthermore, we obtained acceptable selectivity in the various solution with salivary proteins such as α-amylase, human serum albumin, immunoglobulin G (IgG), lysozyme, and mucin. In the future, we try to detect the sIgA in real saliva for on-site stress measurement using GLEIA and to integrate the various immunosensors for stress markers in saliva.
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Affiliation(s)
- Shuto Osaki
- AIST-Osaka University Advanced Photonics and Biosensing Open Innovation Laboratory, AIST, Suita, Japan.,Graduate School of Engineering, Osaka University, Suita, Japan
| | - Shin-Ichi Wakida
- AIST-Osaka University Advanced Photonics and Biosensing Open Innovation Laboratory, AIST, Suita, Japan.,Graduate School of Engineering, Osaka University, Suita, Japan.,Graduate School of Human Development and Environment, Kobe University, Kobe, Japan
| | - Masato Saito
- AIST-Osaka University Advanced Photonics and Biosensing Open Innovation Laboratory, AIST, Suita, Japan.,Graduate School of Engineering, Osaka University, Suita, Japan
| | - Eiichi Tamiya
- AIST-Osaka University Advanced Photonics and Biosensing Open Innovation Laboratory, AIST, Suita, Japan. .,Graduate School of Engineering, Osaka University, Suita, Japan.
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5
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Miyazaki CM, Kinahan DJ, Mishra R, Mangwanya F, Kilcawley N, Ferreira M, Ducrée J. Label-free, spatially multiplexed SPR detection of immunoassays on a highly integrated centrifugal Lab-on-a-Disc platform. Biosens Bioelectron 2018; 119:86-93. [PMID: 30103158 DOI: 10.1016/j.bios.2018.07.056] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 07/18/2018] [Accepted: 07/27/2018] [Indexed: 02/06/2023]
Abstract
As a direct, label-free method, Surface Plasmon Resonance (SPR) detection significantly reduces the needs for liquid handling and reagent storage compared to common enzyme-linked immunosorbent assays (ELISAs), thus enabling comprehensive multiplexing of bioassays on microfluidic sample-to-answer systems. This paper describes a highly integrated centrifugal Lab-on-a-Disc (LoaD) platform for automating the full process chain extending between plasma extraction and subsequent aliquoting to five parallelized reaction channels for quantitative SPR detection by an inexpensive smartphone camera. The entire, multi-step / multi-reagent operation completes within less than 1 h. While the emphasis of this work is on the fluidic automation and parallelization by previously introduced, very robust event-triggered valving and buoyancy-driven centripetal pumping schemes, we successfully implement an immunoglobulin G (IgG) assay; by specific functionalization of the detection surfaces, the same disc layout can readily be customised for immunoassays panels from whole blood.
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Affiliation(s)
- Celina M Miyazaki
- FPC@DCU - Fraunhofer Project Centre for Embedded Bioanalytical Systems at Dublin City University, School of Physical Sciences, Dublin City University, Ireland; Federal University of São Carlos, Sorocaba, SP, Brazil.
| | - David J Kinahan
- FPC@DCU - Fraunhofer Project Centre for Embedded Bioanalytical Systems at Dublin City University, School of Physical Sciences, Dublin City University, Ireland
| | - Rohit Mishra
- FPC@DCU - Fraunhofer Project Centre for Embedded Bioanalytical Systems at Dublin City University, School of Physical Sciences, Dublin City University, Ireland
| | - Faith Mangwanya
- FPC@DCU - Fraunhofer Project Centre for Embedded Bioanalytical Systems at Dublin City University, School of Physical Sciences, Dublin City University, Ireland
| | - Niamh Kilcawley
- FPC@DCU - Fraunhofer Project Centre for Embedded Bioanalytical Systems at Dublin City University, School of Physical Sciences, Dublin City University, Ireland
| | | | - Jens Ducrée
- FPC@DCU - Fraunhofer Project Centre for Embedded Bioanalytical Systems at Dublin City University, School of Physical Sciences, Dublin City University, Ireland.
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Abstract
We present an original, low-cost nanoplasmonic (bio)sensor based on crossed surface relief gratings (CSRGs) generated from orthogonally superimposed surface relief gratings (SRGs) on gold-coated azo-glass substrate. This surface plasmon resonance (SPR)-based sensing approach is unique, since the light transmitted through a CSRG is zero except in the narrow bandwidth where the SPR conversion occurs, enabling quantitative monitoring of only the plasmonic signal from biomolecular interactions in real time. We validated the individual SRG plasmonic signature of CSRGs by observing their respective SPR excitation peaks, and tested them to detect both bulk and near-surface refractive index (RI) changes. Compared to simple SRGs, CSRGs portray a much-improved sensitivity of 647.8 nm/RIU, a resolution on the order of 10-5 RIU, and a figure of merit (FOM) of 14 for bulk RI-change sensing. We also demonstrate their ability to perform as biosensors, through the detection and monitoring of near-surface biomolecular interactions in real time, a first for CSRGs. The minimum detectable concentration of biotin-streptavidin binding events was 8.3 nM. Due to their sensing abilities, low cost (<10 cents/unit), ease of fabrication, and inherent suitability for integration with microfluidics, we anticipate that CSRGs will stand as strong candidates in the portable diagnostics arena.
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Affiliation(s)
- Srijit Nair
- Department
of Chemical Engineering, Queen’s University, 19 Division Street, Kingston, Ontario K7L 3N6, Canada
| | - Carlos Escobedo
- Department
of Chemical Engineering, Queen’s University, 19 Division Street, Kingston, Ontario K7L 3N6, Canada
| | - Ribal Georges Sabat
- Department
of Physics, Royal Military College of Canada, Kingston, Ontario K7K 7B4, Canada
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7
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Singh H, Morita T, Suzuki Y, Shimojima M, Le Van A, Sugamata M, Yang M. High sensitivity, high surface area Enzyme-linked Immunosorbent Assay (ELISA). Biomed Mater Eng 2016; 26:115-27. [PMID: 26684884 DOI: 10.3233/bme-151561] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND Enzyme-linked immunosorbent assays (ELISA) are considered the gold standard in the demonstration of various immunological reactions with an application in the detection of infectious diseases such as during outbreaks or in patient care. OBJECTIVE This study aimed to produce an ELISA-based diagnostic with an increased sensitivity of detection compared to the standard 96-well method in the immunologic diagnosis of infectious diseases. METHODS A '3DStack' was developed using readily available, low cost fabrication technologies namely nanoimprinting and press stamping with an increased surface area of 4 to 6 times more compared to 96-well plates. This was achieved by stacking multiple nanoimprinted polymer sheets. The flow of analytes between the sheets was enhanced by rotating the 3DStack and confirmed by Finite-Element (FE) simulation. An Immunoglobulin G (IgG) ELISA for the detection of antibodies in human serum raised against Rubella virus was performed for validation. RESULTS An improved sensitivity of up to 1.9 folds higher was observed using the 3DStack compared to the standard method. CONCLUSIONS The increased surface area of the 3DStack developed using nanoimprinting and press stamping technologies, and the flow pattern between sheets generated by rotating the 3DStack were potential contributors to a more sensitive ELISA-based diagnostic device.
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Affiliation(s)
- Harpal Singh
- Department of Intelligent Mechanical Systems, Graduate School of System Design, Tokyo Metropolitan University, Tokyo, Japan.,Department of Virology 1, National Institute of Infectious Diseases, Tokyo, Japan
| | - Takahiro Morita
- Department of Intelligent Mechanical Systems, Graduate School of System Design, Tokyo Metropolitan University, Tokyo, Japan
| | - Yuma Suzuki
- Department of Intelligent Mechanical Systems, Graduate School of System Design, Tokyo Metropolitan University, Tokyo, Japan
| | - Masayuki Shimojima
- Department of Virology 1, National Institute of Infectious Diseases, Tokyo, Japan
| | - An Le Van
- Department of Microbiology, Hue University of Medicine and Pharmacy, Hue City, Vietnam
| | - Masami Sugamata
- Department of Microbiology, Hue University of Medicine and Pharmacy, Hue City, Vietnam.,Department of Hygiene and Public Health, Graduate School of Human Health Sciences, Tokyo Metropolitan University, Tokyo, Japan
| | - Ming Yang
- Department of Intelligent Mechanical Systems, Graduate School of System Design, Tokyo Metropolitan University, Tokyo, Japan
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8
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Affiliation(s)
- Alinaghi Salari
- Department of Chemical Engineering; University of Toronto; 200 College Street Toronto Ontario M5S 3E5 Canada
| | - Eugenia Kumacheva
- Department of Chemical Engineering; University of Toronto; 200 College Street Toronto Ontario M5S 3E5 Canada
- Department of Chemistry; University of Toronto; 80 Saint George Street Toronto Ontario M5S 3H6 Canada
- Institute of Biomaterials and Biomedical Engineering; University of Toronto; 164 College Street Toronto Ontario M5S 3G9 Canada
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9
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Microfluidic Surface Plasmon Resonance Sensors: From Principles to Point-of-Care Applications. SENSORS 2016; 16:s16081175. [PMID: 27472340 PMCID: PMC5017341 DOI: 10.3390/s16081175] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 07/18/2016] [Accepted: 07/21/2016] [Indexed: 12/15/2022]
Abstract
Surface plasmon resonance (SPR) is a label-free, highly-sensitive, and real-time sensing technique. Conventional SPR sensors, which involve a planar thin gold film, have been widely exploited in biosensing; various miniaturized formats have been devised for portability purposes. Another type of SPR sensor which utilizes localized SPR (LSPR), is based on metal nanostructures with surface plasmon modes at the structural interface. The resonance condition is sensitive to the refractive index change of the local medium. The principles of these two types of SPR sensors are reviewed and their integration with microfluidic platforms is described. Further applications of microfluidic SPR sensors to point-of-care (POC) diagnostics are discussed.
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10
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Tang M, Wang G, Kong SK, Ho HP. A Review of Biomedical Centrifugal Microfluidic Platforms. MICROMACHINES 2016; 7:E26. [PMID: 30407398 PMCID: PMC6190084 DOI: 10.3390/mi7020026] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 02/03/2016] [Indexed: 12/14/2022]
Abstract
Centrifugal microfluidic or lab-on-a-disc platforms have many advantages over other microfluidic systems. These advantages include a minimal amount of instrumentation, the efficient removal of any disturbing bubbles or residual volumes, and inherently available density-based sample transportation and separation. Centrifugal microfluidic devices applied to biomedical analysis and point-of-care diagnostics have been extensively promoted recently. This paper presents an up-to-date overview of these devices. The development of biomedical centrifugal microfluidic platforms essentially covers two categories: (i) unit operations that perform specific functionalities, and (ii) systems that aim to address certain biomedical applications. With the aim to provide a comprehensive representation of current development in this field, this review summarizes progress in both categories. The advanced unit operations implemented for biological processing include mixing, valving, switching, metering and sequential loading. Depending on the type of sample to be used in the system, biomedical applications are classified into four groups: nucleic acid analysis, blood analysis, immunoassays, and other biomedical applications. Our overview of advanced unit operations also includes the basic concepts and mechanisms involved in centrifugal microfluidics, while on the other hand an outline on reported applications clarifies how an assembly of unit operations enables efficient implementation of various types of complex assays. Lastly, challenges and potential for future development of biomedical centrifugal microfluidic devices are discussed.
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Affiliation(s)
- Minghui Tang
- Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong, China.
| | - Guanghui Wang
- Institute of Optical Communication Engineering, Nanjing University, Jiangsu 210009, China.
| | - Siu-Kai Kong
- School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong, China.
| | - Ho-Pui Ho
- Department of Electronic Engineering, The Chinese University of Hong Kong, Shatin, Hong Kong, China.
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Rattanarat P, Teengam P, Siangproh W, Ishimatsu R, Nakano K, Chailapakul O, Imato T. An Electrochemical Compact Disk-type Microfluidics Platform for Use as an Enzymatic Biosensor. ELECTROANAL 2015. [DOI: 10.1002/elan.201400590] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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12
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Shima T, Fujimaki M, Yoshida A, Gopinath SCB, Kuwahara M, Ohki Y, Awazu K. Detection of Influenza Viruses Attached to an Optical Disk. ACTA ACUST UNITED AC 2013. [DOI: 10.4236/jbnb.2013.42020] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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13
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Kim J. Joining plasmonics with microfluidics: from convenience to inevitability. LAB ON A CHIP 2012; 12:3611-3623. [PMID: 22858903 DOI: 10.1039/c2lc40498b] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Along the advances in optofluidics, functionalities based on the surface plasmon-polariton have also been finding an increasing level of involvement within micro/nano-fluidic systems, gradually forming a new field of plasmo-fluidics. This survey of the burgeoning field reveals that judicious selection and combination of plasmonic and micro/nano-fluidic features render the plasmo-fluidic integration useful and mutually beneficial to the point of inevitability. We establish categories for the level of integration and utilize them as a framework for surveying existing work and extracting future perspectives.
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Affiliation(s)
- Jaeyoun Kim
- Department of Electrical and Computer Engineering, Iowa State University, Ames, Iowa 50011, USA.
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