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Aoyama S, Akiyama Y, Monden K, Yamada M, Seki M. Thermally imprinted microcone structure-assisted lateral-flow immunoassay platforms for detecting disease marker proteins. Analyst 2019; 144:1519-1526. [DOI: 10.1039/c8an01903g] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lateral-flow immunoassay devices, incorporating thermally-imprinted microcone array structures, have been developed for detecting disease marker proteins.
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Affiliation(s)
| | | | | | - Masumi Yamada
- Department of Applied Chemistry and Biotechnology
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
| | - Minoru Seki
- Department of Applied Chemistry and Biotechnology
- Graduate School of Engineering
- Chiba University
- Chiba 263-8522
- Japan
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Paper-Based Microfluidic Platforms for Understanding the Role of Exosomes in the Pathogenesis of Major Blindness-Threatening Diseases. NANOMATERIALS 2018; 8:nano8050310. [PMID: 29738436 PMCID: PMC5977324 DOI: 10.3390/nano8050310] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Revised: 04/28/2018] [Accepted: 05/07/2018] [Indexed: 12/16/2022]
Abstract
Emerging roles of exosomes in the pathogenesis of major blindness-threatening diseases, such as age-related macular degeneration, glaucoma, and corneal dystrophy, were discovered by aqueous humor analysis. A new diagnostic method using cellulose-based devices and microfluidic chip techniques for the isolation of exosomes from aqueous humor is less cumbersome and saves time. This method will enable more investigations for aqueous humor analysis in the future.
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Charlton JJ, Lavrik N, Bradshaw JA, Sepaniak MJ. Wicking nanopillar arrays with dual roughness for selective transport and fluorescence measurements. ACS APPLIED MATERIALS & INTERFACES 2014; 6:17894-17901. [PMID: 25247442 DOI: 10.1021/am504604j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Silicon nanopillars are important building elements for innovative nanoscale systems with unique optical, wetting, and chemical separation functionalities. However, technologies for creating expansive pillars arrays on the submicron scale are often complex and with practical time, cost, and method limitations. Herein we demonstrate the rapid fabrication of nanopillar arrays using the thermal dewetting of Pt films with thicknesses in the range from 5 to 19 nm followed by anisotropic reactive ion etching (RIE) of the substrate materials. A second level of roughness on the sub-30 nm scale is added by overcoating the silicon nanopillars with a conformal layer of porous silicon oxide (PSO) using room temperature plasma enhanced chemical vapor deposition (PECVD). This technique produced environmentally conscious, economically feasible, expansive nanopillar arrays with a production pathway scalable to industrial demands. The arrays were systematically analyzed for size, density, and variability of the pillar dimensions. We show that these stochastic arrays exhibit rapid wicking of various fluids and, when functionalized with a physiosorbed layer of silicone oil, act as a superhydrophobic surface. We also demonstrate high brightness fluorescence and selective transport of model dye compounds on surfaces of the implemented nanopillar arrays with two-tier roughness. The demonstrated combination of functionalities creates a platform with attributes inherently important for advanced separations and chemical analysis.
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Affiliation(s)
- Jennifer J Charlton
- The University of Tennessee Knoxville , Department of Chemistry, Knoxville, Tennessee 37996, United States
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Kandziolka M, Charlton JJ, Kravchenko II, Bradshaw JA, Merkulov IA, Sepaniak MJ, Lavrik NV. Silicon nanopillars as a platform for enhanced fluorescence analysis. Anal Chem 2013; 85:9031-8. [PMID: 23984845 DOI: 10.1021/ac401500y] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The importance of fluorescent detection in many fields is well established. While advancements in instrumentation and the development of brighter fluorophore have increased sensitivity and lowered the detection limits of the method, additional gains can be made by manipulating the local electromagnetic field. Herein we take advantage of silicon nanopillars that exhibit optical resonances and field enhancement on their surfaces and demonstrate their potential in improving performance of biomolecular fluorescent assays. We use electron beam lithography and wafer scale processes to create silicon nanoscale pillars with dimensions that can be tuned to maximize fluorescence enhancement in a particular spectral region. Performance of the nanopillar based fluorescent assay was quantified using two model bioaffinity systems (biotin-streptavidin and immunoglobulin G-antibody) as well as covalent binding of fluorescently tagged bovine serum albumin (BSA). The effects of pillar geometry and number of pillars in arrays were evaluated. Color specific and pillar diameter dependent enhancement of fluorescent signals is clearly demonstrated using green and red labels (FITC, DyLight 488, Alexa 568, and Alexa 596). The ratios of the on pillar to off pillar signals normalized by the nominal increase in surface area due to nanopillars were found to be 43, 75, and 292 for the IgG-antibody assay, streptavidin-biotin system, and covalently attached BSA, respectively. Applicability of the presented approaches to the detection of small numbers of molecules was evaluated using highly diluted labeled proteins and also control experiments without biospecific analytes. Our analysis indicates that detection of fewer than 10 tagged proteins is possible.
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Affiliation(s)
- Michael Kandziolka
- Center for Nanophase Materials Sciences, Oak Ridge National Laboratory , P.O. Box 2008, Oak Ridge, Tennessee 37831, United States
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Micro-spot with integrated pillars (MSIP) for detection of dengue virus NS1. Biomed Microdevices 2013; 15:959-71. [DOI: 10.1007/s10544-013-9787-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pestana N, Walsh D, Hatch A, Hahn P, Jaffe GJ, Murthy SK, Niedre M. A Dedicated Low-Cost Fluorescence Microfluidic Device Reader for Point-of-Care Ocular Diagnostics. J Med Device 2013. [DOI: 10.1115/1.4023995] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Microfluidic fluorescence assay devices show great promise as preclinical and clinical diagnostic instruments. Normally, fluorescence signals from microfluidic chips are quantified by analysis of images obtained with a commercial fluorescence microscope. This method is unnecessarily expensive, time consuming, and requires significant operator training, particularly when considering future clinical translation of the technology. In this work, we developed a dedicated low cost fluorescence microfluidic device reader (FMDR) to read sandwich immunofluorescence assay (sIFA) devices configured to detect vascular endothelial growth factor ligand concentrations in ocular fluid samples. Using a series of sIFA calibration standards and a limited set of human ocular fluid samples, we demonstrated that our FMDR reader has similar sensitivity and accuracy to a fluorescence microscope for this task, with significantly lower total cost and reduced reading time. We anticipate that the reader could be used with minor modifications for virtually any fluorescence microfluidic device.
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Affiliation(s)
- Noah Pestana
- Department of Electrical and Computer Engineering, Northeastern University, Boston, MA 02115
| | | | - Adam Hatch
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115
| | | | - Glenn J. Jaffe
- Department of Ophthalmology, Duke University Eye Center, P. O. Box 3802, Durham, NC 27710
| | - Shashi K. Murthy
- Department of Chemical Engineering, Northeastern University, Boston, MA 02115
| | - Mark Niedre
- Department of Electrical and Computer Engineering, Northeastern University, Boston, MA 02115 e-mail:
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Gregory CW, Sellgren KL, Gilchrist KH, Grego S. High yield fabrication of multilayer polydimethylsiloxane [corrected] devices with freestanding micropillar arrays. BIOMICROFLUIDICS 2013; 7:56503. [PMID: 24396532 PMCID: PMC3829920 DOI: 10.1063/1.4827600] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Accepted: 10/17/2013] [Indexed: 05/07/2023]
Abstract
A versatile method to fabricate a multilayer polydimethylsiloxane (PDMS) device with micropillar arrays within the inner layer is reported. The method includes an inexpensive but repeatable approach for PDMS lamination at high compressive force to achieve high yield of pillar molding and transfer to a temporary carrier. The process also enables micropillar-containing thin films to be used as the inner layer of PDMS devices integrated with polymer membranes. A microfluidic cell culture device was demonstrated which included multiple vertically stacked flow channels and a pillar array serving as a cage for a collagen hydrogel. The functionality of the multilayer device was demonstrated by culturing collagen-embedded fibroblasts under interstitial flow through the three-dimensional scaffold. The fabrication methods described in this paper can find applications in a variety of devices, particularly for organ-on-chip applications.
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Affiliation(s)
- Christopher W Gregory
- Center for Materials and Electronics Technologies, RTI International, Research Triangle Park, North Carolina 27709-2194, USA
| | - Katelyn L Sellgren
- Center for Materials and Electronics Technologies, RTI International, Research Triangle Park, North Carolina 27709-2194, USA
| | - Kristin H Gilchrist
- Center for Materials and Electronics Technologies, RTI International, Research Triangle Park, North Carolina 27709-2194, USA
| | - Sonia Grego
- Center for Materials and Electronics Technologies, RTI International, Research Triangle Park, North Carolina 27709-2194, USA
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Cao JT, Chen ZX, Hao XY, Zhang PH, Zhu JJ. Quantum Dots-Based Immunofluorescent Microfluidic Chip for the Analysis of Glycan Expression at Single-Cells. Anal Chem 2012; 84:10097-104. [DOI: 10.1021/ac302609y] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Jun-Tao Cao
- State Key Laboratory of Analytical Chemistry for Life Science,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P.R. China
| | - Zi-Xuan Chen
- State Key Laboratory of Analytical Chemistry for Life Science,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P.R. China
| | - Xiao-Yao Hao
- State Key Laboratory of Analytical Chemistry for Life Science,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P.R. China
| | - Peng-Hui Zhang
- State Key Laboratory of Analytical Chemistry for Life Science,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P.R. China
| | - Jun-Jie Zhu
- State Key Laboratory of Analytical Chemistry for Life Science,
School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P.R. China
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Chen GD, Fachin F, Colombini E, Wardle BL, Toner M. Nanoporous micro-element arrays for particle interception in microfluidic cell separation. LAB ON A CHIP 2012; 12:3159-67. [PMID: 22763858 PMCID: PMC4005922 DOI: 10.1039/c2lc40109f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The ability to control cell-surface interactions in order to achieve binding of specific cell types is a major challenge for microfluidic immunoaffinity cell capture systems. In the majority of existing systems, the functionalized capture surface is constructed of solid materials, where flow stagnation at the solid-liquid interface is detrimental to the convection of cells to the surface. We study the use of ultra-high porosity (99%) nanoporous micro-posts in microfluidic channels for enhancing interception efficiency of particles in flow. We show using both modelling and experiment that nanoporous posts improve particle interception compared to solid posts through two distinct mechanisms: the increase of direct interception, and the reduction of near-surface hydrodynamic resistance. We provide initial validation that the improvement of interception efficiency also results in an increase in capture efficiency when comparing nanoporous vertically aligned carbon nanotube (VACNT) post arrays with solid PDMS post arrays of the same geometry. Using both bacteria (∼1 μm) and cancer cell lines (∼15 μm) as model systems, we found capture efficiency increases by 6-fold and 4-fold respectively. The combined model and experimental platform presents a new generation of nanoporous microfluidic devices for cell isolation.
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Affiliation(s)
- Grace D. Chen
- BioMEMS Resource Center, Massachusetts General Hospital, Charlestown, Massachusetts, 02129, USA., Fax: 617-371-4950; Tel: 617-371-4883
| | - Fabio Fachin
- BioMEMS Resource Center, Massachusetts General Hospital, Charlestown, Massachusetts, 02129, USA., Fax: 617-371-4950; Tel: 617-371-4883
- Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Elena Colombini
- Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
- Department of Materials and Environmental Engineering (DIMA), University of Modena and Reggio Emilia, Via Vignolese 905/A- 41125 Modena, Italy
| | - Brian L. Wardle
- Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Mehmet Toner
- BioMEMS Resource Center, Massachusetts General Hospital, Charlestown, Massachusetts, 02129, USA., Fax: 617-371-4950; Tel: 617-371-4883
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Lee CJ, Jung JH, Seo TS. 3D Porous Sol–Gel Matrix Incorporated Microdevice for Effective Large Volume Cell Sample Pretreatment. Anal Chem 2012; 84:4928-34. [DOI: 10.1021/ac3005549] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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