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González-Lana S, Randelovic T, Ciriza J, López-Valdeolivas M, Monge R, Sánchez-Somolinos C, Ochoa I. Surface modifications of COP-based microfluidic devices for improved immobilisation of hydrogel proteins: long-term 3D culture with contractile cell types and ischaemia model. LAB ON A CHIP 2023; 23:2434-2446. [PMID: 37013698 DOI: 10.1039/d3lc00075c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The tissue microenvironment plays a crucial role in tissue homeostasis and disease progression. However, the in vitro simulation has been limited by the lack of adequate biomimetic models in the last decades. Thanks to the advent of microfluidic technology for cell culture applications, these complex microenvironments can be recreated by combining hydrogels, cells and microfluidic devices. Nevertheless, this advance has several limitations. When cultured in three-dimensional (3D) hydrogels inside microfluidic devices, contractile cells may exert forces that eventually collapse the 3D structure. Disrupting the compartmentalisation creates an obstacle to long-term or highly cell-concentrated assays, which are extremely relevant for multiple applications such as fibrosis or ischaemia. Therefore, we tested surface treatments on cyclic-olefin polymer-based microfluidic devices (COP-MD) to promote the immobilisation of collagen as a 3D matrix protein. Thus, we compared three surface treatments in COP devices for culturing human cardiac fibroblasts (HCF) embedded in collagen hydrogels. We determined the immobilisation efficiency of collagen hydrogel by quantifying the hydrogel transversal area within the devices at the studied time points. Altogether, our results indicated that surface modification with polyacrylic acid photografting (PAA-PG) of COP-MD is the most effective treatment to avoid the quick collapse of collagen hydrogels. As a proof-of-concept experiment, and taking advantage of the low-gas permeability properties of COP-MD, we studied the application of PAA-PG pre-treatment to generate a self-induced ischaemia model. Different necrotic core sizes were developed depending on initial HCF density seeding with no noticeable gel collapse. We conclude that PAA-PG allows long-term culture, gradient generation and necrotic core formation of contractile cell types such as myofibroblasts. This novel approach will pave the way for new relevant in vitro co-culture models where fibroblasts play a key role such as wound healing, tumour microenvironment and ischaemia within microfluidic devices.
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Affiliation(s)
- Sandra González-Lana
- Tissue Microenvironment (TME) Lab. Aragón Institute of Engineering Research (I3A), University of Zaragoza, C/ Mariano Esquillor s/n, 500018 Zaragoza, Spain.
- BEONCHIP S.L., CEMINEM, Campus Río Ebro. C/ Mariano Esquillor Gómez s/n, 50018 Zaragoza, Spain
| | - Teodora Randelovic
- Tissue Microenvironment (TME) Lab. Aragón Institute of Engineering Research (I3A), University of Zaragoza, C/ Mariano Esquillor s/n, 500018 Zaragoza, Spain.
- Institute for Health Research Aragón (IIS Aragón), Paseo de Isabel La Católica 1-3, 50009 Zaragoza, Spain
- CIBER in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
| | - Jesús Ciriza
- Tissue Microenvironment (TME) Lab. Aragón Institute of Engineering Research (I3A), University of Zaragoza, C/ Mariano Esquillor s/n, 500018 Zaragoza, Spain.
- Institute for Health Research Aragón (IIS Aragón), Paseo de Isabel La Católica 1-3, 50009 Zaragoza, Spain
| | - María López-Valdeolivas
- Aragón Institute of Nanoscience and Materials (INMA), Department of Condensed Matter Physics (Faculty of Science), CSIC-University of Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Rosa Monge
- BEONCHIP S.L., CEMINEM, Campus Río Ebro. C/ Mariano Esquillor Gómez s/n, 50018 Zaragoza, Spain
| | - Carlos Sánchez-Somolinos
- CIBER in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
- Aragón Institute of Nanoscience and Materials (INMA), Department of Condensed Matter Physics (Faculty of Science), CSIC-University of Zaragoza, C/ Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Ignacio Ochoa
- Tissue Microenvironment (TME) Lab. Aragón Institute of Engineering Research (I3A), University of Zaragoza, C/ Mariano Esquillor s/n, 500018 Zaragoza, Spain.
- Institute for Health Research Aragón (IIS Aragón), Paseo de Isabel La Católica 1-3, 50009 Zaragoza, Spain
- CIBER in Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Madrid, Spain
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A new insight into a thermoplastic microfluidic device aimed at improvement of oxygenation process and avoidance of shear stress during cell culture. Biomed Microdevices 2022; 24:15. [PMID: 35277762 PMCID: PMC8917112 DOI: 10.1007/s10544-022-00615-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/18/2022] [Indexed: 01/01/2023]
Abstract
Keeping the oxygen concentration at the desired physiological limits is a challenging task in cellular microfluidic devices. A good knowledge of affecting parameters would be helpful to control the oxygen delivery to cells. This study aims to provide a fundamental understanding of oxygenation process within a hydrogel-based microfluidic device considering simultaneous mass transfer, medium flow, and cellular consumption. For this purpose, the role of geometrical and hydrodynamic properties was numerically investigated. The results are in good agreement with both numerical and experimental data in the literature. The obtained results reveal that increasing the microchannel height delays the oxygen depletion in the absence of media flow. We also observed that increasing the medium flow rate increases the oxygen concentration in the device; however, it leads to high maximum shear stress. A novel pulsatile medium flow injection pattern is introduced to reduce detrimental effect of the applied shear stress on the cells.
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Salva ML, Rocca M, Niemeyer CM, Delamarche E. Methods for immobilizing receptors in microfluidic devices: A review. MICRO AND NANO ENGINEERING 2021. [DOI: 10.1016/j.mne.2021.100085] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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4
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Qi Y, Wang Y, Chen C, Zhao C, Ma Y, Yang W. Facile Surface Functionalization of Cyclic Olefin Copolymer Film with Anhydride Groups for Protein Microarray Fabrication. ACS APPLIED BIO MATERIALS 2020; 3:3203-3209. [PMID: 35025362 DOI: 10.1021/acsabm.0c00200] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Immobilization of protein at high efficiency is a challenge for fabricating polymer-based protein chips. Here, a simple but effective approach was developed to fabricate a cyclic olefin copolymer (COC)-based protein microarray with a high immobilization density. In this strategy, poly(maleic anhydride-co-vinyl acetate) (poly(MAH-co-VAc)) brushes were facilely attached on the COC surface via UV-induced graft copolymerization. The introduction of poly(MAH-co-VAc) brushes resulted in an obvious increase in the surface roughness of COC. The functionalized COC showed little reduction in transparency compared with pristine COC, indicating that the photografting treatment did not alter its optical property. The graft density of the anhydride groups on the modified COC could be tuned from 0.46 to 3.2 μmol/cm2. The immobilization efficiency of immunoglobulin G (IgG) on functionalized COC reached 88% due to the high reactivity between anhydride groups and amine groups of IgGs. An immunoassay experiment demonstrated that the microarray showed high sensitivity to the target analyte.
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You JB, Lee B, Choi Y, Lee CS, Peter M, Im SG, Lee SS. Nanoadhesive layer to prevent protein absorption in a poly(dimethylsiloxane) microfluidic device. Biotechniques 2020; 69:404-409. [PMID: 32372656 DOI: 10.2144/btn-2020-0025] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Poly(dimethylsiloxane) (PDMS) is widely used as a microfluidics platform material; however, it absorbs various molecules, perturbing specific chemical concentrations in microfluidic channels. We present a simple solution to prevent adsorption into a PDMS microfluidic device. We used a vapor-phase-deposited nanoadhesive layer to seal PDMS microfluidic channels. Absorption of fluorescent molecules into PDMS was efficiently prevented in the nanolayer-treated PDMS device. Importantly, when cultured in a nanolayer-treated PDMS device, yeast cells exhibited the expected concentration-dependent response to a mating pheromone, including mating-specific morphological and gene expression changes, while yeast cultured in an untreated PDMS device did not properly respond to the pheromone. Our method greatly expands microfluidic applications that require precise control of molecule concentrations.
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Affiliation(s)
- Jae Bem You
- Department of Chemical & Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Byungjin Lee
- Department of Chemical Engineering & Applied Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Yunho Choi
- Department of Chemical & Biomolecular Engineering, KAIST, Daejeon, 34141, Republic of Korea
| | - Chang-Soo Lee
- Department of Chemical Engineering & Applied Chemistry, Chungnam National University, Daejeon, 34134, Republic of Korea
| | - Matthias Peter
- Institute for Biochemistry, ETH Zürich, Zürich, CH 8093, Switzerland
| | - Sung Gap Im
- Department of Chemical & Biomolecular Engineering, KAIST, Daejeon, 34141, Republic of Korea
| | - Sung Sik Lee
- Institute for Biochemistry, ETH Zürich, Zürich, CH 8093, Switzerland.,Scientific Center for Optical & Electron Microscopy (ScopeM), ETH Zürich, Zürich, CH 8093, Switzerland
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6
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Liang C, Liu Y, Niu A, Liu C, Li J, Ning D. Smartphone-app based point-of-care testing for myocardial infarction biomarker cTnI using an autonomous capillary microfluidic chip with self-aligned on-chip focusing (SOF) lenses. LAB ON A CHIP 2019; 19:1797-1807. [PMID: 30976769 DOI: 10.1039/c9lc00259f] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Cardiovascular disease is one of the most common causes of mortality in the world. Most of the diagnostic processes usually require bulky instruments and trained professionals, which cannot meet the demand for fast, early and regular bedside diagnosis. In this paper, a bespoke app on a smartphone and an autonomous capillary microfluidic chip (ACMC) are combined to realize the point-of-care testing of cardiac troponin I (cTnI). The smartphone-app-ACMC platform was based on the sandwich immunofluorescence principle and featured self-aligned on-chip focusing (SOF) lenses which can avoid the complex optical coupling process. The operator only needs to introduce 100 μl sample into the ACMC, where the priming, time-delaying, mixing and washing steps for the assay can be accomplished automatically. With the help of the bespoke app and a palm-sized optical attachment, the smartphone can capture fluorescence images, process fluorescence intensity information, output detection results and save the results for long-term monitoring. Our results showed that within 12 min, the detection limit of 78 pg ml-1 and 94 pg ml-1 for cTnI was attained in buffer and spiked human serum, respectively. Our proposed platform has the potential to be applied in the POCT field especially for some resource-limited settings.
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Affiliation(s)
- Chao Liang
- Key Laboratory for Micro/Nano Technology and System of Liaoning Province, Dalian University of Technology, Dalian, China.
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7
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Separation and preconcentration of actinides from concentrated nitric acid by extraction chromatography in microsystems. Talanta 2018; 185:586-591. [DOI: 10.1016/j.talanta.2018.04.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 03/28/2018] [Accepted: 04/08/2018] [Indexed: 01/05/2023]
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8
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Losno M, Ferrante I, Brennetot R, Descroix S, Mariet C. Design of experiments as tools to tailor impregnated polymers specific for radionuclides separation in microsystems. REACT FUNCT POLYM 2018. [DOI: 10.1016/j.reactfunctpolym.2018.04.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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9
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Carvalho RR, Pujari SP, Vrouwe EX, Zuilhof H. Mild and Selective C-H Activation of COC Microfluidic Channels Allowing Covalent Multifunctional Coatings. ACS APPLIED MATERIALS & INTERFACES 2017; 9:16644-16650. [PMID: 28481097 PMCID: PMC5437660 DOI: 10.1021/acsami.7b02022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2017] [Accepted: 05/01/2017] [Indexed: 05/21/2023]
Abstract
Plastics, such as cyclic olefin copolymer (COC), are becoming an increasingly popular material for microfluidics. COC is used, in part, because of its (bio)-chemical resistance. However, its inertness and hydrophobicity can be a major downside for many bioapplications. In this paper, we show the first example of a surface-bound selective C-H activation of COC into alcohol C-OH moieties under mild aqueous conditions at room temperature. The nucleophilic COC-OH surface allows for subsequent covalent attachments, such as of a H-terminated silane. The resulting hybrid material (COC-Si-H) was then modified via a photolithographic hydrosilylation in the presence of ω-functionalized 1-alkenes to form a new highly stable, solvent-resistant hybrid surface.
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Affiliation(s)
- Rui Rijo Carvalho
- Laboratory of Organic
Chemistry, Wageningen University & Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- Micronit Microtechnologies B.V., Colosseum 15, 7521 PV Enschede, The Netherlands
| | - Sidharam P. Pujari
- Laboratory of Organic
Chemistry, Wageningen University & Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
| | - Elwin X. Vrouwe
- Micronit Microtechnologies B.V., Colosseum 15, 7521 PV Enschede, The Netherlands
| | - Han Zuilhof
- Laboratory of Organic
Chemistry, Wageningen University & Research, Stippeneng 4, 6708 WE Wageningen, The Netherlands
- School of
Pharmaceutical Sciences and Technology, Tianjin University, 92 Weijin Road, Tianjin 300072, P.R. China
- Department of Chemical
and Materials Engineering, King Abdulaziz
University, Jeddah 23218, Saudi Arabia
- E-mail:
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Wei X, Sun P, Yang S, Zhao L, Wu J, Li F, Pu Q. Microchip electrophoresis with background electrolyte containing polyacrylic acid and high content organic solvent in cyclic olefin copolymer microchips for easily adsorbed dyes. J Chromatogr A 2016; 1457:144-50. [DOI: 10.1016/j.chroma.2016.06.044] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 06/12/2016] [Accepted: 06/15/2016] [Indexed: 01/15/2023]
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11
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Wang JC, Liu W, Tu Q, Ma C, Zhao L, Wang Y, Ouyang J, Pang L, Wang J. High throughput and multiplex localization of proteins and cells for in situ micropatterning using pneumatic microfluidics. Analyst 2015; 140:827-36. [DOI: 10.1039/c4an01972e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
We present a micropatterning method for protein/cell localization by using pneumatically controllable microstructures in an integrated microfluidic device.
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Affiliation(s)
- Jian-Chun Wang
- Colleges of Science and Veterinary Medicine
- Northwest A&F University
- Yangling
- China
- Energy Research Institute of Shandong Academy of Sciences
| | - Wenming Liu
- Colleges of Science and Veterinary Medicine
- Northwest A&F University
- Yangling
- China
| | - Qin Tu
- Colleges of Science and Veterinary Medicine
- Northwest A&F University
- Yangling
- China
| | - Chao Ma
- Colleges of Science and Veterinary Medicine
- Northwest A&F University
- Yangling
- China
| | - Lei Zhao
- Colleges of Science and Veterinary Medicine
- Northwest A&F University
- Yangling
- China
| | - Yaolei Wang
- Colleges of Science and Veterinary Medicine
- Northwest A&F University
- Yangling
- China
| | - Jia Ouyang
- School of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi'an
- China
| | - Long Pang
- Colleges of Science and Veterinary Medicine
- Northwest A&F University
- Yangling
- China
| | - Jinyi Wang
- Colleges of Science and Veterinary Medicine
- Northwest A&F University
- Yangling
- China
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12
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Laaniste A, Marechal A, El-Debs R, Randon J, Dugas V, Demesmay C. “Thiol-ene” photoclick chemistry as a rapid and localizable functionalization pathway for silica capillary monolithic columns. J Chromatogr A 2014; 1355:296-300. [DOI: 10.1016/j.chroma.2014.06.031] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 05/06/2014] [Accepted: 06/11/2014] [Indexed: 10/25/2022]
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13
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Lin Z, Ma Y, Zhao C, Chen R, Zhu X, Zhang L, Yan X, Yang W. An extremely simple method for fabricating 3D protein microarrays with an anti-fouling background and high protein capacity. LAB ON A CHIP 2014; 14:2505-14. [PMID: 24852169 DOI: 10.1039/c4lc00223g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Protein microarrays have become vital tools for various applications in biomedicine and bio-analysis during the past decade. The intense requirements for a lower detection limit and industrialization in this area have resulted in a persistent pursuit to fabricate protein microarrays with a low background and high signal intensity via simple methods. Here, we report on an extremely simple strategy to create three-dimensional (3D) protein microarrays with an anti-fouling background and a high protein capacity by photo-induced surface sequential controlled/living graft polymerization developed in our lab. According to this strategy, "dormant" groups of isopropyl thioxanthone semipinacol (ITXSP) were first introduced to a polymeric substrate through ultraviolet (UV)-induced surface abstraction of hydrogen, followed by a coupling reaction. Under visible light irradiation, the ITXSP groups were photolyzed to initiate surface living graft polymerization of poly(ethylene glycol) methyl methacrylate (PEGMMA), thus introducing PEG brushes to the substrate to generate a full anti-fouling background. Due to the living nature of this graft polymerization, there were still ITXSP groups on the chain ends of the PEG brushes. Therefore, by in situ secondary living graft cross-linking copolymerization of glycidyl methacrylate (GMA) and polyethylene glycol diacrylate (PEGDA), we could finally plant height-controllable cylinder microarrays of a 3D PEG network containing reactive epoxy groups onto the PEG brushes. Through a commonly used reaction of amine and epoxy groups, the proteins could readily be covalently immobilized onto the microarrays. This delicate design aims to overcome two universal limitations in protein microarrays: a full anti-fouling background can effectively eliminate noise caused by non-specific absorption and a 3D reactive network provides a larger protein-loading capacity to improve signal intensity. The results of non-specific protein absorption tests demonstrated that the introduction of PEG brushes greatly improved the anti-fouling properties of the pristine low-density polyethylene (LDPE), for which the absorption to bovine serum albumin was reduced by 83.3%. Moreover, the 3D protein microarrays exhibited a higher protein capacity than the controls to which were attached the same protein on PGMA brushes and monolayer epoxy functional groups. The 3D protein microarrays were used to test the immunoglobulin G (IgG) concentration in human serum, suggesting that they could be used for biomedical diagnosis, which indicates that more potential bio-applications could be developed for these protein microarrays in the future.
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Affiliation(s)
- Zhifeng Lin
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.
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14
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Roy S, Das T, Yue CY, Hu X. Transparent cyclic olefin copolymer/silica nanocomposites. POLYM INT 2014. [DOI: 10.1002/pi.4511] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Sunanda Roy
- School of Materials Science and Engineering; Nanyang Technological University; Singapore 639798
| | - Tanya Das
- Singapore−MIT Alliance, Manufacturing Systems and Technology Programme; Nanyang Technological University; 65 Nanyang Drive Singapore 637460
- School of Mechanical and Aerospace Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798
| | - Chee Yoon Yue
- Singapore−MIT Alliance, Manufacturing Systems and Technology Programme; Nanyang Technological University; 65 Nanyang Drive Singapore 637460
- School of Mechanical and Aerospace Engineering; Nanyang Technological University; 50 Nanyang Avenue Singapore 639798
| | - Xiao Hu
- School of Materials Science and Engineering; Nanyang Technological University; Singapore 639798
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15
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Chen R, Ma Y, Zhao C, Lin Z, Zhu X, Zhang L, Yang W. Construction of DNA microarrays on cyclic olefin copolymer surfaces using confined photocatalytic oxidation. RSC Adv 2014. [DOI: 10.1039/c4ra07442d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel strategy for DNA immobilization on cyclic olefin copolymer surfaces.
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Affiliation(s)
- Ruichao Chen
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029, China
- Beijing Laboratory of Biomedical Materials
- Beijing University of Chemical Technology
| | - Yuhong Ma
- Key Laboratory of Carbon Fiber and Functional Polymers
- Ministry of Education
- College of Materials Science and Engineering
- Beijing University of Chemical Technology
- Beijing 100029, China
| | - Changwen Zhao
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029, China
- Beijing Laboratory of Biomedical Materials
- Beijing University of Chemical Technology
| | - Zhifeng Lin
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029, China
- Beijing Laboratory of Biomedical Materials
- Beijing University of Chemical Technology
| | - Xing Zhu
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029, China
- Beijing Laboratory of Biomedical Materials
- Beijing University of Chemical Technology
| | - Lihua Zhang
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029, China
- Beijing Laboratory of Biomedical Materials
- Beijing University of Chemical Technology
| | - Wantai Yang
- State Key Laboratory of Chemical Resource Engineering
- Beijing University of Chemical Technology
- Beijing 100029, China
- Beijing Laboratory of Biomedical Materials
- Beijing University of Chemical Technology
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16
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Hosseini S, Ibrahim F, Djordjevic I, Koole LH. Recent advances in surface functionalization techniques on polymethacrylate materials for optical biosensor applications. Analyst 2014; 139:2933-43. [DOI: 10.1039/c3an01789c] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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17
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Perez-Toralla K, Champ J, Mohamadi MR, Braun O, Malaquin L, Viovy JL, Descroix S. New non-covalent strategies for stable surface treatment of thermoplastic chips. LAB ON A CHIP 2013; 13:4409-4418. [PMID: 24061577 DOI: 10.1039/c3lc50888a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
In order to be more extensively used outside of research laboratories, lab-on-chip technologies must be mass-produced using low-cost materials such as thermoplastics. Thermoplastics, however, are generally hydrophobic in their native state, which makes them unsuitable for direct use with biological samples in aqueous solution, and thus require surface coating. This coating should be robust, inexpensive and simple to implement, in order not to hinder the industrial advantage of thermoplastic chips. Cyclic Olefin Copolymer (COC) is a particularly appealing polymer, but it is also difficult to functionalize due to its chemical inertness. Here we introduce and compare the performance of two new approaches for COC coating. One relies on the use of a commercial triblock copolymer, Pluronic® F127. The second approach uses new copolymers synthesized by radical polymerization, and consisting of a dimethylacrylamide (DMA) backbone carrying aliphatic side chains (C22). Two DMA-C22 copolymers were synthesized with various C22/DMA ratios: DMA-S at 0.175% and DMA-M at 0.35%. Different physicochemical properties of the polymers such as critical micellar concentration (CMC), water contact angle, electroosmosis were investigated. Coated COC chips were then tested for their ability to reduce the adsorption of proteins, microparticles, and for protein electrophoresis. For each application we found an optimal treatment protocol to considerably improve the performance of the thermoplastic chip. These treatments use physisorption in situ which requires no photografting or chemical reaction and can be performed by a simple incubation either after chip production, or just prior to use.
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Affiliation(s)
- Karla Perez-Toralla
- Macromolecules and Microsystems in Biology and Medicine, Institut Curie, Centre National de Recherche Scientifique, Université Pierre et Marie Curie, UMR 168, 75005 Paris, France
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18
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Jeong SP, Hong D, Kang SM, Choi IS, Lee JK. Polymeric Functionalization of Cyclic Olefin Copolymer Surfaces with Nonbiofouling Poly(oligo(Ethylene Glycol) Methacrylate). ASIAN J ORG CHEM 2013. [DOI: 10.1002/ajoc.201300078] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Wei X, Gao X, Zhao L, Peng X, Zhou L, Wang J, Pu Q. Fast and interference-free determination of glyphosate and glufosinate residues through electrophoresis in disposable microfluidic chips. J Chromatogr A 2013; 1281:148-54. [PMID: 23398994 DOI: 10.1016/j.chroma.2013.01.039] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2012] [Revised: 01/07/2013] [Accepted: 01/08/2013] [Indexed: 01/05/2023]
Abstract
With an increasing concern on food safety, fast screening of residues of widespread herbicides becomes necessary. Herein we report a microchip electrophoresis system with laser induced fluorescence (LIF) detection for rapid and sensitive analysis of glyphosate (GLYP) and glufosinate (GLUF) residues. Disposable cyclic olefin copolymer microchips and a low-cost LIF detector were employed to minimize the cost of the analysis. Systematic optimization of experimental conditions was performed to achieve highly efficient analysis. Under the selected condition, GLYP and GLUF were efficiently resolved from sample matrices with a buffer containing 10 mmol/L borax and 2.0% (m/v) hydroxypropyl cellulose at pH 9.0. The number of theoretical plates of 1.0×10(6) m(-1) was attained for both analytes. Derivatization at lower concentrations (<10 μg/L) was also examined, successful detection of 0.34 μg/L GLYP and 0.18 μg/L GLUF was confirmed. The system was applied for the determination of both analytes in real samples without any preconcentration involved. Recoveries of GLYP and GLUF spiked in these samples were 84.0-101.0% and 90.0-103.0%, respectively.
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Affiliation(s)
- Xuan Wei
- State Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, Lanzhou, Gansu 730000, China
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Li R, Wang L, Gao X, Du G, Zhai H, Wang X, Guo G, Pu Q. Rapid separation and sensitive determination of banned aromatic amines with plastic microchip electrophoresis. JOURNAL OF HAZARDOUS MATERIALS 2013; 248-249:268-275. [PMID: 23385207 DOI: 10.1016/j.jhazmat.2013.01.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Revised: 12/28/2012] [Accepted: 01/08/2013] [Indexed: 06/01/2023]
Abstract
Rapid analysis of trace amount of aromatic amines in environmental samples and daily necessities has attracted considerable attentions because some of them are strongly toxic and carcinogenic. In this study, fast and efficient electrophoretic separation and sensitive determination of 5 banned aromatic amines were explored for practical analysis using disposable plastic microchips combined with a low-cost laser-induced fluorescence detector. The effect of running buffer and its additive was systematically investigated. Under the selected condition, 5 fluorescein isothiocyanate labeled aromatic amines could be baseline separated within 90s by using a 10mmol/L borate buffer containing 2% (w/v) hydroxypropyl cellulose. Calibration curves of peak areas vs. concentrations were linear up to 40 or 120μmol/L for different analytes and limits of detection were in a range of 1-3nmol/L. Theoretical plate numbers of 6.8-8.5×10(5)/m were readily achieved. The method exhibited good repeatability, relative standard deviations (n=5) of peak areas and migration times were no more than 4.6% and 0.9%, respectively. The established method was successfully applied in the quantitative analysis of these banned aromatic amines in real samples of waste water and textile, recoveries of added standards were 85-110%.
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Affiliation(s)
- Ruina Li
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou, Gansu 730000, China
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21
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Peng X, Zhao L, Du G, Wei X, Guo J, Wang X, Guo G, Pu Q. Charge tunable zwitterionic polyampholyte layers formed in cyclic olefin copolymer microchannels through photochemical graft polymerization. ACS APPLIED MATERIALS & INTERFACES 2013; 5:1017-23. [PMID: 23331535 DOI: 10.1021/am3027019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Zwitterionic layers immobilized on various surfaces exhibit ideal biocompatibility and antifouling capability, but direct immobilization of zwitterionic molecules provides limited choice of surface charges. In this paper, the formation of charge tunable zwitterionic polyampholyte layers onto the surface of microfluidic channels of cyclic olefin copolymer by photochemical graft polymerization of mixed acrylic monomers, [2-(acryloyloxy) ethyl] trimethyl ammonium chloride and 2-acrylamido-2-methyl-1-propanesulfonic, under UV illumination was reported. With this method, surface charge of the resulting modification layers could be tailored through the initial monomer ratio and reaction conditions. The incorporation of both monomers into the grafted layers was confirmed by X-ray photoelectron spectroscopy (XPS) and attenuated total reflection Fourier transform infrared (ATR-FTIR). The results indicate that the modified layers are hydrophilic with contact angles of 33.0-44.3°, and the isoelectric points of the modified layers can be tuned from <3 to >9 simply by adjusting the monomer ratios. Elimination of the nonspecific adsorption of proteins on the zwitterionic layers thus formed was proved by fluorescent microscopy and streaming potential measurement. The uniformity of the modified layers was verified through a comparison of electrophoresis inside the modified and native microchannels. A whole blood coagulation time measurement was performed to show its applicability.
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Affiliation(s)
- Xianglu Peng
- State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, Department of Chemistry, Lanzhou University, Lanzhou, Gansu, 730000, China
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22
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Testouri A, Arriaga L, Honorez C, Ranft M, Rodrigues J, van der Net A, Lecchi A, Salonen A, Rio E, Guillermic RM, Langevin D, Drenckhan W. Generation of porous solids with well-controlled morphologies by combining foaming and flow chemistry on a Lab-on-a-Chip. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.02.048] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Synthesis and characterization of novel tungsten complexes and their activity in the ROMP of cyclic olefins. Polyhedron 2012. [DOI: 10.1016/j.poly.2012.05.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Zahorodny-Burke M, Nearingburg B, Elias A. Finite element analysis of oxygen transport in microfluidic cell culture devices with varying channel architectures, perfusion rates, and materials. Chem Eng Sci 2011. [DOI: 10.1016/j.ces.2011.09.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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26
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Wang Q, Zhang Y, Ding H, Wu J, Wang L, Zhou L, Pu Q. The use of ethylene glycol solution as the running buffer for highly efficient microchip-based electrophoresis in unmodified cyclic olefin copolymer microchips. J Chromatogr A 2011; 1218:9422-7. [PMID: 22099226 DOI: 10.1016/j.chroma.2011.10.078] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2011] [Revised: 10/25/2011] [Accepted: 10/27/2011] [Indexed: 11/18/2022]
Abstract
An ethylene glycol solution was used as the electrophoretic running buffer in unmodified cyclic olefin copolymer (COC) microchips to minimize the interactions between the analytes and the hydrophobic walls of the plastic microchannels, enhance the resolution of the analytes and eliminate the uncontrollable dispersion caused by uneven liquid levels and non-uniform surfaces of the separation channels. Five amino acids that were labeled with fluorescein isothiocyanate (FITC) were used as model analytes to examine the separation efficiency. The effects of ethylene glycol concentration, pH and sodium tetraborate concentration were systematically investigated. The five FITC-labeled amino acids were effectively resolved using a COC microchip with an effective length of 2.5 cm under optimum conditions, which included using a running buffer of 20 mmol/L sodium tetraborate in ethylene glycol:water (80:20, v/v), pH 6.7. A theoretical plate number of 4.8 × 10(5)/m was obtained for aspartic acid. The system exhibited good repeatability, and the relative standard deviations (n=5) of the peak areas and migration times were no more than 3.4% and 0.7%, respectively. Furthermore, the system was successfully applied to elucidate these five amino acids in human saliva.
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Affiliation(s)
- Qin Wang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization, Gansu Province, Sate Key Laboratory of Applied Organic Chemistry, Department of Chemistry, Lanzhou University, 222 Southern Tianshui Road, Lanzhou, Gansu 730000, China
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27
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Bhandari P, Narahari T, Dendukuri D. 'Fab-chips': a versatile, fabric-based platform for low-cost, rapid and multiplexed diagnostics. LAB ON A CHIP 2011; 11:2493-9. [PMID: 21735030 DOI: 10.1039/c1lc20373h] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Low cost and scalable manufacture of lab-on-chip devices for applications such as point-of-care testing is an urgent need. Weaving is presented as a unified, scalable and low-cost platform for the manufacture of fabric chips that can be used to perform such testing. Silk yarns with different properties are first selected, treated with the appropriate reagent solutions, dried and handloom-woven in one step into an integrated fabric chip. This platform has the unique advantage of scaling up production using existing and low cost physical infrastructure. We have demonstrated the ability to create pre-defined flow paths in fabric by using wetting and non-wetting silk yarns and a Jacquard attachment in the loom. Further, we show that yarn parameters such as the yarn twist frequency and weaving coverage area may be conveniently used to tune both the wicking rate and the absorptive capacity of the fabric. Yarns optimized for their final function were used to create an integrated fabric chip containing reagent-coated yarns. Strips of this fabric were then used to perform a proof-of-concept immunoassay with sample flow taking place by capillary action and detection being performed by a visual readout.
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Affiliation(s)
- Paridhi Bhandari
- Achira Labs Pvt. Ltd., 108/27, 29th Main, 23rd Cross, BTM-II, Bangalore, 560076, India
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28
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Rivet C, Lee H, Hirsch A, Hamilton S, Lu H. Microfluidics for medical diagnostics and biosensors. Chem Eng Sci 2011. [DOI: 10.1016/j.ces.2010.08.015] [Citation(s) in RCA: 140] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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29
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Luna-Vera F, Ferguson JD, Alvarez JC. Real Time Detection of Lysozyme by Pulsed Streaming Potentials Using Polyclonal Antibodies Immobilized on a Renewable Nonfouling Surface Inside Plastic Microfluidic Channels. Anal Chem 2011; 83:2012-9. [DOI: 10.1021/ac102769j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Fernando Luna-Vera
- Department of Chemistry, Virginia Commonwealth University, P.O. Box 842006, Richmond, Virginia 23284, United States
| | - Josephus D. Ferguson
- Department of Physics, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Julio C. Alvarez
- Department of Chemistry, Virginia Commonwealth University, P.O. Box 842006, Richmond, Virginia 23284, United States
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30
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Utko P, Persson F, Kristensen A, Larsen NB. Injection molded nanofluidic chips: fabrication method and functional tests using single-molecule DNA experiments. LAB ON A CHIP 2011; 11:303-8. [PMID: 21057689 DOI: 10.1039/c0lc00260g] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
We demonstrate that fabrication of well-defined nanofluidic systems can be greatly simplified by injection molding of thermoplastic polymers. Chips featuring nanochannel arrays, microchannels and integrated interconnects are produced in a single processing step by injection molding. The resulting open channel structures are subsequently sealed by facile plasma-enhanced thermal bonding of a polymer film. This fast, inexpensive and industry-compatible method thus provides a single-use all-polymer platform for nanofluidic lab-on-a-chip applications. Its applicability for nanofluidics is demonstrated by DNA stretching experiments performed on individual double-stranded DNA molecules confined in the injection molded nanochannels. The obtained results are consistent with measurements performed in costly state-of-the-art silica nanochannels, for both straight and tapered channel geometries.
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Affiliation(s)
- Pawel Utko
- DTU Nanotech, Department of Micro and Nanotechnology, Technical University of Denmark, DK-2800, Kongens Lyngby, Denmark.
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31
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Roy S, Yue CY, Venkatraman SS, Ma LL. Low-temperature (below Tg) thermal bonding of COC microfluidic devices using UV photografted HEMA-modified substrates: high strength, stable hydrophilic, biocompatible surfaces. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11750e] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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32
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Functionalization of cyclo-olefin polymer substrates by plasma oxidation: Stable film containing carboxylic acid groups for capturing biorecognition elements. Colloids Surf B Biointerfaces 2010; 81:544-8. [DOI: 10.1016/j.colsurfb.2010.07.055] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Revised: 07/24/2010] [Accepted: 07/24/2010] [Indexed: 11/21/2022]
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33
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Ktari N, Poncet P, Sénéchal H, Malaquin L, Kanoufi F, Combellas C. Patterning of polystyrene by scanning electrochemical microscopy. Biological applications to cell adhesion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:17348-17356. [PMID: 20945917 DOI: 10.1021/la1028564] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Polystyrene surfaces may be patterned by Ag(II), NO(3)(•), and OH(•) electrogenerated at the tip of a scanning electrochemical microscope. These electrogenerated reagents lead to local surface oxidation of the polymer. The most efficient surface treatment is obtained with Ag(II). The patterns are evidenced by XPS and IR and also by the surface wettability contrast between the hydrophobic virgin surface and the hydrophilic pattern. Such Ag(II) treatment of a polystyrene Petri dish generates discriminative surfaces able to promote or disfavor the adhesion of proteins and also the adhesion and growth of adherent cells. The process is also successfully applied to a cyclo-olefin copolymer and should be suitable to pattern any hydrogenated polymer.
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Affiliation(s)
- N Ktari
- Physicochimie des Electrolytes, Colloïdes et Sciences Analytiques, ESPCI ParisTech, CNRS UMR 7195, 10 rue Vauquelin, Paris, F-75231 France
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34
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Kim J, Hong D, Jeong S, Kong B, Kang SM, Kim YG, Choi IS. Aryl Azide Based, Photochemical Patterning of Cyclic Olefin Copolymer Surfaces with Non-Biofouling Poly[(3-(methacryloylamino)propyl)dimethyl(3-sulfopropyl)ammonium hydroxide]. Chem Asian J 2010; 6:363-6. [DOI: 10.1002/asia.201000569] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2010] [Indexed: 11/07/2022]
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35
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Total internal reflection ellipsometry as a label-free assessment method for optimization of the reactive surface of bioassay devices based on a functionalized cycloolefin polymer. Anal Bioanal Chem 2010; 398:1927-36. [DOI: 10.1007/s00216-010-4099-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2010] [Revised: 08/03/2010] [Accepted: 08/04/2010] [Indexed: 10/19/2022]
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36
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Vázquez M, Paull B. Review on recent and advanced applications of monoliths and related porous polymer gels in micro-fluidic devices. Anal Chim Acta 2010; 668:100-13. [DOI: 10.1016/j.aca.2010.04.033] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2010] [Revised: 04/15/2010] [Accepted: 04/16/2010] [Indexed: 10/19/2022]
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37
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Adsorption kinetics of proteins in plastic microfluidic channels: Real-time monitoring of lysozyme adsorption by pulsed streaming potentials. Biosens Bioelectron 2010; 25:1539-43. [DOI: 10.1016/j.bios.2009.11.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2009] [Revised: 10/17/2009] [Accepted: 11/02/2009] [Indexed: 11/21/2022]
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38
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Saaem I, Ma KS, Marchi AN, LaBean TH, Tian J. In situ synthesis of DNA microarray on functionalized cyclic olefin copolymer substrate. ACS APPLIED MATERIALS & INTERFACES 2010; 2:491-497. [PMID: 20356196 DOI: 10.1021/am900884b] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Thermoplastic materials such as cyclic-olefin copolymers (COC) provide a versatile and cost-effective alternative to the traditional glass or silicon substrate for rapid prototyping and industrial scale fabrication of microdevices. To extend the utility of COC as an effective microarray substrate, we developed a new method that enabled for the first time in situ synthesis of DNA oligonucleotide microarrays on the COC substrate. To achieve high-quality DNA synthesis, a SiO(2) thin film array was prepatterned on the inert and hydrophobic COC surface using RF sputtering technique. The subsequent in situ DNA synthesis was confined to the surface of the prepatterned hydrophilic SiO(2) thin film features by precision delivery of the phosphoramidite chemistry using an inkjet DNA synthesizer. The in situ SiO(2)-COC DNA microarray demonstrated superior quality and stability in hybridization assays and thermal cycling reactions. Furthermore, we demonstrate that pools of high-quality mixed-oligos could be cleaved off the SiO(2)-COC microarrays and used directly for construction of DNA origami nanostructures. It is believed that this method will not only enable synthesis of high-quality and low-cost COC DNA microarrays but also provide a basis for further development of integrated microfluidics microarrays for a broad range of bioanalytical and biofabrication applications.
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Affiliation(s)
- Ishtiaq Saaem
- Department of Biomedical Engineering, Duke University, Durham, NC 27708, USA
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39
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Okagbare PI, Emory JM, Datta P, Goettert J, Soper SA. Fabrication of a cyclic olefin copolymer planar waveguide embedded in a multi-channel poly(methyl methacrylate) fluidic chip for evanescence excitation. LAB ON A CHIP 2010; 10:66-73. [PMID: 20024052 PMCID: PMC2859618 DOI: 10.1039/b908759a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The fabrication and characterization of a novel cyclic olefin copolymer (COC) waveguide embedded in a poly(methyl methacrylate), PMMA, fluidic chip configured in a multi-channel format with an integrated monolithic prism for evanescent fluorescence excitation are reported. The fabrication approach allowed the embedded waveguide to be situated orthogonal to a series of fluidic channels within the PMMA wafer to sample fluorescent solutions in these channels using the evanescence properties of the waveguide. Construction of the device was achieved using several fabrication techniques including high precision micromilling, hot embossing and stenciling of a polymer melt to form the waveguide and coupling prism. A waveguide channel was fabricated in the fluidic chip's cover plate, also made from PMMA, and was loaded with a COC solution using a pre-cast poly(dimethylsiloxane), PDMS, stencil containing a prism-shaped recess. The PMMA substrate contained multiple channels (100 microm wide x 30 microm deep with a pitch of 100 microm) that were situated orthogonal to the waveguide to allow penetration of the evanescent field into the sampling solution. The optical properties of the waveguide in terms of its transmission properties and penetration depth of the evanescent field in the adjacent solution were evaluated. Finally, the device was used for laser-induced fluorescence evanescent excitation of a dye solution hydrodynamically flowing through multiple microfluidic channels in the chip and processed using a microscope equipped with a charge-coupled device (CCD) for parallel readout. The device and optical system were able to image 11 channels simultaneously with a limit-of-detection of 7.1 x 10(-20) mol at a signal-to-noise ratio of 2. The waveguide was simple to manufacture and could be scaled to illuminate much higher channel numbers making it appropriate for high-throughput measurements using evanescent excitation.
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Affiliation(s)
- Paul I. Okagbare
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, USA
- Center for BioModular Multi-Scale Systems, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Jason M. Emory
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, USA
- Center for BioModular Multi-Scale Systems, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Proyag Datta
- Center for BioModular Multi-Scale Systems, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Jost Goettert
- Center for BioModular Multi-Scale Systems, Louisiana State University, Baton Rouge, LA, 70803, USA
| | - Steven A. Soper
- Department of Chemistry, Louisiana State University, Baton Rouge, LA, 70803, USA
- Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA, 70803, USA
- Center for BioModular Multi-Scale Systems, Louisiana State University, Baton Rouge, LA, 70803, USA
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40
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Faure K, Albert M, Dugas V, Crétier G, Ferrigno R, Morin P, Rocca JL. Development of an acrylate monolith in a cyclo-olefin copolymer microfluidic device for chip electrochromatography separation. Electrophoresis 2009; 29:4948-55. [PMID: 19130574 DOI: 10.1002/elps.200800235] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An acrylate monolith has been synthesized into a cyclic olefin copolymer microdevice for reversed-phase electrochromatography purposes. Microchannels, designed by hot embossing, were filled up with an acrylate monolith to serve as a hydrophobic stationary phase. A lauryl acrylate monolith was formulated to suit the hydrophobic material, by implementing 100% organic porogenic solvent. This new composition was tested in capillary prior to its transfer into the microfluidic device. Surface functionalization of the cyclic olefin copolymer surface was applied using UV-grafting technique to improve the covalent attachment of this monolith to the plastic walls of the microfluidic chip. The on-chip performances of this monolith were evaluated in detail for the reversed-phase electrochromatographic separation of polycyclic aromatic hydrocarbons, with plate heights reaching down to 10 microm when working at optimal velocity.
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Affiliation(s)
- Karine Faure
- Laboratoire des Sciences Analytiques, Université de Lyon, Villeurbanne, France.
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41
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Ma KS, Reza F, Saaem I, Tian J. Versatile surface functionalization of cyclic olefin copolymer (COC) with sputtered SiO2 thin film for potential BioMEMS applications. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b904663a] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Chen L, Rengifo HR, Grigoras C, Li X, Li Z, Ju J, Koberstein JT. Spin-On End-Functional Diblock Copolymers for Quantitative DNA Immobilization. Biomacromolecules 2008; 9:2345-52. [DOI: 10.1021/bm800258g] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lu Chen
- Columbia University Department of Chemical Engineering 500 West 120th Street, New York, New York 10027, and Columbia Genome Center, Columbia University College of Physicians and Surgeons, New York, New York 10032
| | - Hernán R. Rengifo
- Columbia University Department of Chemical Engineering 500 West 120th Street, New York, New York 10027, and Columbia Genome Center, Columbia University College of Physicians and Surgeons, New York, New York 10032
| | - Cristian Grigoras
- Columbia University Department of Chemical Engineering 500 West 120th Street, New York, New York 10027, and Columbia Genome Center, Columbia University College of Physicians and Surgeons, New York, New York 10032
| | - Xiaoxu Li
- Columbia University Department of Chemical Engineering 500 West 120th Street, New York, New York 10027, and Columbia Genome Center, Columbia University College of Physicians and Surgeons, New York, New York 10032
| | - Zengmin Li
- Columbia University Department of Chemical Engineering 500 West 120th Street, New York, New York 10027, and Columbia Genome Center, Columbia University College of Physicians and Surgeons, New York, New York 10032
| | - Jingyue Ju
- Columbia University Department of Chemical Engineering 500 West 120th Street, New York, New York 10027, and Columbia Genome Center, Columbia University College of Physicians and Surgeons, New York, New York 10032
| | - Jeffrey T. Koberstein
- Columbia University Department of Chemical Engineering 500 West 120th Street, New York, New York 10027, and Columbia Genome Center, Columbia University College of Physicians and Surgeons, New York, New York 10032
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43
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Pu Q, Elazazy MS, Alvarez JC. Label-free detection of heparin, streptavidin, and other probes by pulsed streaming potentials in plastic microfluidic channels. Anal Chem 2008; 80:6532-6. [PMID: 18666781 DOI: 10.1021/ac8003117] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In this paper, pulsed streaming potentials generated in plastic microfluidic channels are used for the label-free detection of some model analytes. The microchannels are fabricated with the commodity plastic cyclic olefin copolymer (COC), and the detection signal arises from a change in the surface charge upon analyte adsorption on the modified microchannel surface. The role of the surface modification is to confer the microchannel with a predetermined charge and a particular specificity toward the adsorption of the target analyte. In this work, several target probes displaying different levels of specificity were investigated. Heparin and streptavidin were detected by adsorption on microchannel surfaces modified with protamine and biotin, respectively, whereas bovine serum albumin (BSA) and methylene blue (MB) showed nonspecific adsorption on almost any modified or unmodified COC microchannel surface. The magnitude of the streaming potential was found to be proportional to the liquid pressure and the surface charge of the microchannel in accord with the Smoluchowski equation. Because the relative polarity of the streaming potential is determined by the surface charge, the most straightforward detection with this method occurs when the charge is reversed upon analyte adsorption. This strategy was used for the species described in this work, and the lowest concentrations detected were approximately 0.01 units/mL for heparin (below clinical relevance), approximately 10 (-9) M for BSA, and approximately 10 (-6) M for MB. Unlike the conventional method of steady flow, in this work, the streaming potentials were measured under pulsed conditions of flow and using nonreference electrodes. This approach removes the need of special electrolytes as it is usually required when using reference electrodes, and at the same time, it mitigates the interference of electrochemical drift from the electrodes. Relative standard deviations of approximately 1-2% and measuring times of approximately 10 s are readily attained with this experimental setup. The on-channel modification of the surface was carried out by UV-photografting methods given the significant UV transparency of COC.
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Affiliation(s)
- Qiaosheng Pu
- Virginia Commonwealth University, P.O. Box 842006, Richmond, Virginia 23284, USA
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44
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Jönsson C, Aronsson M, Rundström G, Pettersson C, Mendel-Hartvig I, Bakker J, Martinsson E, Liedberg B, MacCraith B, Ohman O, Melin J. Silane-dextran chemistry on lateral flow polymer chips for immunoassays. LAB ON A CHIP 2008; 8:1191-7. [PMID: 18584097 DOI: 10.1039/b800297e] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The prognosis for patients suffering from cardiovascular and many other diseases can be substantially improved if diagnosed at an early stage. High performance diagnostic testing using disposable microfluidic chips can provide a platform for realizing this vision. Amic AB (Uppsala, Sweden) has developed a new microfluidic test chip for sandwich immunoassays fabricated by injection molding of the cycloolefin-copolymer Zeonor. A highly ordered array of micropillars within the fluidic chip distributes the sample solution by capillary action. Since wetting of the pillar array surface is the only driving force for liquid distribution precise control of the surface chemistry is crucial. In this work we demonstrate a novel protocol for surface hydrophilization and antibody immobilization on cycloolefin-copolymer test chips, based on direct silanisation of the thermoplastic substrate. Dextran is subsequently covalently coupled to amino groups, thus providing a coating with a low contact angle suitable for antibody immobilization. The contact angle of dextran coated chips is stable for at least two months, which enables production of large batches that can be stored for extended periods of time. We demonstrate the utility of the presented platform and surface chemistry in a C-reactive protein assay with a detection limit of 2.6 ng ml(-1), a dynamic range of 10(2) and a coefficient of variance of 15%.
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Goda T, Matsuno R, Konno T, Takai M, Ishihara K. Photografting of 2-methacryloyloxyethyl phosphorylcholine from polydimethylsiloxane: Tunable protein repellency and lubrication property. Colloids Surf B Biointerfaces 2008; 63:64-72. [DOI: 10.1016/j.colsurfb.2007.11.014] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2007] [Revised: 11/08/2007] [Accepted: 11/11/2007] [Indexed: 11/30/2022]
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Wang Y, Ke Y, Ren L, Wu G, Chen X, Zhao Q. Surface engineering of PHBV by covalent collagen immobilization to improve cell compatibility. J Biomed Mater Res A 2008; 88:616-27. [DOI: 10.1002/jbm.a.31858] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yingjun Wang
- Biomaterial Research Institute, College of Material Science and Engineering, South China University of Technology, Guangzhou, China
- Key Laboratory of Specially Functional Material and Advanced Manufacturing Technology, South China University of Technology, Guangzhou, China
| | - Yu Ke
- Biomaterial Research Institute, College of Material Science and Engineering, South China University of Technology, Guangzhou, China
| | - Li Ren
- Biomaterial Research Institute, College of Material Science and Engineering, South China University of Technology, Guangzhou, China
- Key Laboratory of Specially Functional Material and Advanced Manufacturing Technology, South China University of Technology, Guangzhou, China
| | - Gang Wu
- Biomaterial Research Institute, College of Material Science and Engineering, South China University of Technology, Guangzhou, China
- Key Laboratory of Specially Functional Material and Advanced Manufacturing Technology, South China University of Technology, Guangzhou, China
| | - Xiaofeng Chen
- Biomaterial Research Institute, College of Material Science and Engineering, South China University of Technology, Guangzhou, China
- Key Laboratory of Specially Functional Material and Advanced Manufacturing Technology, South China University of Technology, Guangzhou, China
| | - Qichun Zhao
- Department of Orthopedics, Anhui Provincial Hospital, Heifei, China
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