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Zhang J, Lv S, Zhao X, Ma S, Zhou F. Surface functionalization of polyurethanes: A critical review. Adv Colloid Interface Sci 2024; 325:103100. [PMID: 38330882 DOI: 10.1016/j.cis.2024.103100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Revised: 01/23/2024] [Accepted: 02/02/2024] [Indexed: 02/10/2024]
Abstract
Synthetic polymers, particularly polyurethanes (PUs), have revolutionized bioengineering and biomedical devices due to their customizable mechanical properties and long-term stability. However, the inherent hydrophobic nature of PU surfaces arises common issues such as high friction, strong protein adsorption, and thrombosis, especially in the physiological environment of blood contact. To overcome these issues, researchers have explored various modification techniques to improve the surface biofunctionality of PUs. In this review, we have systematically summarized several typical surface modification methods including surface plasma modification, surface oxidation-induced grafting polymerization, isocyanate-based chemistry coupling, UV-induced surface grafting polymerization, adhesives-assisted attachment strategy, small molecules-bridge grafting, solvent evaporation technique, and hydrogen bonding interaction. Correspondingly, the advantages, limitations, and future prospects of these surface modification methods were discussed. This review provides an important guidance or tool for developing surface functionalized PUs in the fields of bioengineering and medical devices.
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Affiliation(s)
- Jinshuai Zhang
- Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai, Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai 264006, China
| | - Siyao Lv
- Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai, Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai 264006, China
| | - Xiaoduo Zhao
- Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai, Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai 264006, China; State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Shuanhong Ma
- Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai, Yantai Zhongke Research Institute of Advanced Materials and Green Chemical Engineering, Yantai 264006, China; State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
| | - Feng Zhou
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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Gaiser S, Schütz U, Rupper P, Hegemann D. Plasma Processing of Low Vapor Pressure Liquids to Generate Functional Surfaces. Molecules 2020; 25:molecules25246024. [PMID: 33352685 PMCID: PMC7767314 DOI: 10.3390/molecules25246024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2020] [Revised: 12/07/2020] [Accepted: 12/14/2020] [Indexed: 11/16/2022] Open
Abstract
The concept of depositing solid films on low-vapor pressure liquids is introduced and developed into a top-down approach to functionalize surfaces by attaching liquid polyethylene glycol (PEG). Solid-liquid gradients were formed by low-pressure plasma treatment yielding cross-linking and/or deposition of a plasma polymer film subsequently bound to a flexible polydimethylsiloxane (PDMS) backing. The analysis via optical transmission spectroscopy (OTS), optical, confocal laser scanning (CLSM) and scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) as well as by water contact angle (WCA) measurements revealed correlations between optical appearance, chemical composition and surface properties of the resulting water absorbing, covalently bound PEG-functionalized surfaces. Requirements for plasma polymer film deposition on low-vapor pressure liquids and effective surface functionalization are defined. Namely, the thickness of the liquid PEG substrate was a crucial parameter for successful film growth and covalent attachment of PEG. The presented method is a practicable approach for the production of functional surfaces featuring long-lasting strong hydrophilic properties, making them predestined for non-fouling or low-friction applications.
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Al-Ani A, Pingle H, P Reynolds N, Wang PY, Kingshott P. Tuning the Density of Poly(ethylene glycol) Chains to Control Mammalian Cell and Bacterial Attachment. Polymers (Basel) 2017; 9:polym9080343. [PMID: 30971020 PMCID: PMC6418490 DOI: 10.3390/polym9080343] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 08/01/2017] [Accepted: 08/02/2017] [Indexed: 01/21/2023] Open
Abstract
Surface modification of biomaterials with polymer chains has attracted great attention because of their ability to control biointerfacial interactions such as protein adsorption, cell attachment and bacterial biofilm formation. The aim of this study was to control the immobilisation of biomolecules on silicon wafers using poly(ethylene glycol)(PEG) chains by a "grafting to" technique. In particular, to control the polymer chain graft density in order to capture proteins and preserve their activity in cell culture as well as find the optimal density that would totally prevent bacterial attachment. The PEG graft density was varied by changing the polymer solubility using an increasing salt concentration. The silicon substrates were initially modified with aminopropyl-triethoxysilane (APTES), where the surface density of amine groups was optimised using different concentrations. The results showed under specific conditions, the PEG density was highest with grafting under "cloud point" conditions. The modified surfaces were characterised with X-ray photoelectron spectroscopy (XPS), ellipsometry, atomic force microscopy (AFM) and water contact angle measurements. In addition, all modified surfaces were tested with protein solutions and in cell (mesenchymal stem cells and MG63 osteoblast-like cells) and bacterial (Pseudomonas aeruginosa) attachment assays. Overall, the lowest protein adsorption was observed on the highest polymer graft density, bacterial adhesion was very low on all modified surfaces, and it can be seen that the attachment of mammalian cells gradually increased as the PEG grafting density decreased, reaching the maximum attachment at medium PEG densities. The results demonstrate that, at certain PEG surface coverages, mammalian cell attachment can be tuned with the potential to optimise their behaviour with controlled serum protein adsorption.
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Affiliation(s)
- Ahmed Al-Ani
- Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of technology, Hawthorn, VIC 3122, Australia.
| | - Hitesh Pingle
- Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of technology, Hawthorn, VIC 3122, Australia.
| | - Nicholas P Reynolds
- ARC Training Centre for Biodevices, Faculty of Science, Engineering and Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
| | - Peng-Yuan Wang
- Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of technology, Hawthorn, VIC 3122, Australia.
| | - Peter Kingshott
- Department of Chemistry and Biotechnology, School of Science, Faculty of Science, Engineering and Technology, Swinburne University of technology, Hawthorn, VIC 3122, Australia.
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Chitin and chitosan based polyurethanes: A review of recent advances and prospective biomedical applications. Int J Biol Macromol 2016; 86:630-45. [DOI: 10.1016/j.ijbiomac.2016.02.004] [Citation(s) in RCA: 133] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Revised: 01/28/2016] [Accepted: 02/01/2016] [Indexed: 01/30/2023]
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Jin J, Zhang C, Jiang W, Luan S, Yang H, Yin J, Stagnaro P. Melting grafting polypropylene with hydrophilic monomers for improving hemocompatibility. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2012.05.022] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Wu WI, Sask KN, Brash JL, Selvaganapathy PR. Polyurethane-based microfluidic devices for blood contacting applications. LAB ON A CHIP 2012; 12:960-970. [PMID: 22273592 DOI: 10.1039/c2lc21075d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Protein adsorption on PDMS surfaces poses a significant challenge in microfluidic devices that come into contact with biofluids such as blood. Polyurethane (PU) is often used for the construction of medical devices, but despite having several attractive properties for biointerfacing, it has not been widely used in microfluidic devices. In this work we developed two new fabrication processes for making thin, transparent and flexible PU-based microfluidic devices. Methods for the fabrication and bonding of microchannels, the integration of fluidic interconnections and surface modification with hydrophilic polyethylene oxide (PEO) to reduce protein adsorption are detailed. Using these processes, microchannels were produced having high transparency (96% that of glass in visible light), high bond strength (326.4 kPa) and low protein adsorption (80% reduction in fibrinogen adsorption vs. unmodified PDMS), which is critical for prevention of fouling. Our findings indicate that PEO modified PU could serve as an effective alternative to PDMS in blood contacting microfluidic applications.
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Affiliation(s)
- Wen-I Wu
- Department of Mechanical Engineering, McMaster University, Hamilton, ON, Canada
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McDonald SM, Matheson LA, McBane JE, Kuraitis D, Suuronen E, Santerre JP, Labow RS. Use of monocyte/endothelial cell co-cultures (in vitro) and a subcutaneous implant mouse model (in vivo) to evaluate a degradable polar hydrophobic ionic polyurethane. J Cell Biochem 2011; 112:3762-72. [DOI: 10.1002/jcb.23307] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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Abstract
Cell migration is essential for many physiological and pathological processes that include embryonic development, the immune response, wound healing, angiogenesis, and cancer metastasis. It is also important for emerging tissue engineering applications such as tissue reconstitution and the colonization of biomedical implants. By summarizing results from recent experimental and theoretical studies, this review outlines the role played by growth factors or substrate-adhesion molecules in modulating cell motility and shows that cell motility can be an important factor in determining the rates of tissue formation. The application of cell motility assays and the use of theoretical models for analyzing cell migration and proliferation are also discussed.
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Affiliation(s)
- K Zygourakis
- Department of Chemical Engineering and Institute of Biosciences and Bioengineering, Rice University, Houston, Texas 77251-1892
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Schulte VA, Diez M, Hu Y, Möller M, Lensen MC. Combined Influence of Substrate Stiffness and Surface Topography on the Antiadhesive Properties of Acr-sP(EO-stat-PO) Hydrogels. Biomacromolecules 2010; 11:3375-83. [DOI: 10.1021/bm100881y] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Vera A. Schulte
- DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, D-52056 Aachen, and Technische Universität Berlin, Institut für Chemie, Nanostrukturierte Biomaterialien, Berlin, Germany
| | - Mar Diez
- DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, D-52056 Aachen, and Technische Universität Berlin, Institut für Chemie, Nanostrukturierte Biomaterialien, Berlin, Germany
| | - Yibing Hu
- DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, D-52056 Aachen, and Technische Universität Berlin, Institut für Chemie, Nanostrukturierte Biomaterialien, Berlin, Germany
| | - Martin Möller
- DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, D-52056 Aachen, and Technische Universität Berlin, Institut für Chemie, Nanostrukturierte Biomaterialien, Berlin, Germany
| | - Marga C. Lensen
- DWI e.V. and Institute of Technical and Macromolecular Chemistry, RWTH Aachen, D-52056 Aachen, and Technische Universität Berlin, Institut für Chemie, Nanostrukturierte Biomaterialien, Berlin, Germany
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11
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Otsuka H. Nanofabrication of nonfouling surfaces for micropatterning of cell and microtissue. Molecules 2010; 15:5525-46. [PMID: 20714311 PMCID: PMC6257743 DOI: 10.3390/molecules15085525] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2010] [Revised: 07/20/2010] [Accepted: 08/04/2010] [Indexed: 12/13/2022] Open
Abstract
Surface engineering techniques for cellular micropatterning are emerging as important tools to clarify the effects of the microenvironment on cellular behavior, as cells usually integrate and respond the microscale environment, such as chemical and mechanical properties of the surrounding fluid and extracellular matrix, soluble protein factors, small signal molecules, and contacts with neighboring cells. Furthermore, recent progress in cellular micropatterning has contributed to the development of cell-based biosensors for the functional characterization and detection of drugs, pathogens, toxicants, and odorants. In this regards, the ability to control shape and spreading of attached cells and cell-cell contacts through the form and dimension of the cell-adhesive patches with high precision is important. Commitment of stem cells to different specific lineages depends strongly on cell shape, implying that controlled microenvironments through engineered surfaces may not only be a valuable approach towards fundamental cell-biological studies, but also of great importance for the design of cell culture substrates for tissue engineering. To develop this kind of cellular microarray composed of a cell-resistant surface and cell attachment region, micropatterning a protein-repellent surface is important because cellular adhesion and proliferation are regulated by protein adsorption. The focus of this review is on the surface engineering aspects of biologically motivated micropatterning of two-dimensional surfaces with the aim to provide an introductory overview described in the literature. In particular, the importance of non-fouling surface chemistries is discussed.
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Affiliation(s)
- Hidenori Otsuka
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, Shinjuku-ku, Tokyo, Japan.
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MOJIBIAN H, SPECTOR M, NI N, ELISEO D, POLLAK J, TAL M. Initial clinical experience with a new heparin-coated chronic hemodialysis catheter. Hemodial Int 2009; 13:329-34. [DOI: 10.1111/j.1542-4758.2009.00339.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Tan J, Brash J. Nonfouling biomaterials based on polyethylene oxide-containing amphiphilic triblock copolymers as surface modifying additives: Adsorption of proteins from human plasma to copolymer/polyurethane blends. J Biomed Mater Res A 2009; 90:196-204. [DOI: 10.1002/jbm.a.32074] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Okamura A, Hagiwara T, Yamagami S, Yamaguchi M, Shinbo T, Kanamori T, Kondo S, Miwa K, Itagaki I. Effective cell separation utilizing poly(N-isopropylacrylamide)-grafted polypropylene membrane containing adsorbed antibody. J Biosci Bioeng 2008; 105:221-5. [DOI: 10.1263/jbb.105.221] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2007] [Accepted: 12/10/2007] [Indexed: 11/17/2022]
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15
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Protein resistant surfaces: Comparison of acrylate graft polymers bearing oligo-ethylene oxide and phosphorylcholine side chains. Biointerphases 2006; 1:50. [DOI: 10.1116/1.2187495] [Citation(s) in RCA: 133] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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16
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Yoshikawa C, Goto A, Tsujii Y, Fukuda T, Kimura T, Yamamoto K, Kishida A. Protein Repellency of Well-Defined, Concentrated Poly(2-hydroxyethyl methacrylate) Brushes by the Size-Exclusion Effect. Macromolecules 2006. [DOI: 10.1021/ma0520242] [Citation(s) in RCA: 182] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chiaki Yoshikawa
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21140 Korimoto, Kagoshima 890-0065, Japan; and Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Chiyoda, Tokyo 101-0062, Japan
| | - Atsushi Goto
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21140 Korimoto, Kagoshima 890-0065, Japan; and Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Chiyoda, Tokyo 101-0062, Japan
| | - Yoshinobu Tsujii
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21140 Korimoto, Kagoshima 890-0065, Japan; and Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Chiyoda, Tokyo 101-0062, Japan
| | - Takeshi Fukuda
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21140 Korimoto, Kagoshima 890-0065, Japan; and Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Chiyoda, Tokyo 101-0062, Japan
| | - Tsuyoshi Kimura
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21140 Korimoto, Kagoshima 890-0065, Japan; and Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Chiyoda, Tokyo 101-0062, Japan
| | - Kazuya Yamamoto
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21140 Korimoto, Kagoshima 890-0065, Japan; and Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Chiyoda, Tokyo 101-0062, Japan
| | - Akio Kishida
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan; Department of Nanostructured and Advanced Materials, Graduate School of Science and Engineering, Kagoshima University, 1-21140 Korimoto, Kagoshima 890-0065, Japan; and Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, Chiyoda, Tokyo 101-0062, Japan
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Choi GG, Kim HW, Kim YB, Rhee YH. Biocompatibility of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) copolyesters produced byAlcaligenes sp. MT-16. BIOTECHNOL BIOPROC E 2005. [DOI: 10.1007/bf02932291] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Lin WC, Yu DG, Yang MC. Blood compatibility of thermoplastic polyurethane membrane immobilized with water-soluble chitosan/dextran sulfate. Colloids Surf B Biointerfaces 2005; 44:82-92. [PMID: 16023839 DOI: 10.1016/j.colsurfb.2005.05.015] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2004] [Revised: 05/30/2005] [Accepted: 05/30/2005] [Indexed: 11/15/2022]
Abstract
Water-soluble chitosan (WSC)/dextran sulfate (DS) was immobilized onto the surface of thermoplastic polyurethane (TPU) membrane after ozone-induced graft polymerization of poly(acrylic acid) (PAA). The surface was characterized with contact angle measurement and X-ray photoelectron spectroscopy (XPS). The adsorption of human plasma fibrinogen (HPF) followed the Langmuir adsorption isotherm. The results showed that the surface density of peroxides generated and poly(acrylic acid) (PAA) grafted reached the maximum value at 20 min of ozone treatment. It was found that the WSC- and DS-immobilized amount increased with pH and the molecular weight of WSC. The membrane/water interfacial free energy increased with PAA-grafting and WSC/DS-immobilization, indicating the increasing wettability of TPU membrane. The adsorption of HPF on TPU-WSC/DS membranes could be effectively curtailed and exhibited unfavorable adsorption. Moreover, WSC/DS immobilization could effectively reduce platelet adhesion and prolong the blood coagulation time, thereby membrane improving blood compatibility of TPU membrane. In addition, the in vitro cytotoxicity test of PEC modification was non-cytotoxic according to much low growth inhibition of L929 fibroblasts. Furthermore, TPU-WSC/DS membranes exhibited higher cell viability than native TPU membrane.
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Affiliation(s)
- Wen-Ching Lin
- Department of Polymer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan.
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Yoo HJ, Kim HD. Characteristics of crosslinked blends of Pellethene® and multiblock polyurethanes containing phospholipid. Biomaterials 2005; 26:2877-86. [PMID: 15603783 DOI: 10.1016/j.biomaterials.2004.09.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2004] [Accepted: 09/01/2004] [Indexed: 10/26/2022]
Abstract
A series of segmented multiblock polyurethanes (MPUs) were synthesized by polyaddition reaction using hexamethylene diisocyanate (HDI)/poly(ethylene oxide) (PEO, as a hydrophilic component)/ poly(tetramethylene oxide) (PTMO)/ poly(butadiene diol)(PBD)/1,4-butanediol(BD)/(2-[bis(2-hydroxyethyl) methyl ammonio]ethyl stearyl phosphate)[BESP, as a phospholipids component: 0-42 mol% (0-9 wt%)]. To improve the blood compatibility of biomedical grade polyurethane (Pellethene), the Pellethene was blended with MPUs and then crosslinked using dicumyl peroxide as a crosslinking agent. Effects of BESP content [0-42 mol% (0-9 wt%)] in MPUs on the properties of MPUs and blend (Pellethene/MPUs) films were investigated. The X-ray photoelectron spectra indicated that the BESP moieties were located at the surface of the crosslinked blend (Pellethene/MPUs) films. As the BESP content in MPUs increased, the water contact angle on the surfaces of crosslinked blend film was decreased but the water absorption and mechanical properties were markedly increased. By the test of platelet adhesion on the surfaces of crosslinked blend film, it was found that the platelet adhesion on the surface was significantly decreased from 70% to 6% by increasing BESP content from 0 to 42 mol% (0-9 wt%) in MPUs. These results suggest that crosslinked blend films may have more potential as a new material for biomedical applications, which are directly in contact with blood.
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Affiliation(s)
- Hye-Jin Yoo
- Department of Textile Engineering, College of Engineering, Pusan National University, #30 Changjeon-dong, Kumjeong-Ku, Busan 609-735, Korea
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Biocompatibility and antibacterial activity of chitosan and collagen immobilized poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid). Carbohydr Polym 2004. [DOI: 10.1016/j.carbpol.2004.06.039] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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21
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Li Y, Neoh KG, Kang ET. Plasma protein adsorption and thrombus formation on surface functionalized polypyrrole with and without electrical stimulation. J Colloid Interface Sci 2004; 275:488-95. [PMID: 15178277 DOI: 10.1016/j.jcis.2004.02.060] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2003] [Accepted: 02/24/2004] [Indexed: 10/26/2022]
Abstract
A surface modification technique was developed in which heparin was covalently immobilized onto electrically conductive polypyrrole (PPY) film through poly(ethylene glycol) methacrylate (PEGMA) graft copolymerization and subsequent cyanuric chloride activation. In vitro plasma protein adsorption and thrombus formation experiments were carried out on the various films. The PEGMA-graft-copolymerized PPY surfaces with immobilized heparin have good bioactivity indicated by low level of protein adsorption, high ratio of albumin to fibrinogen adsorption, and low thrombus formation, making them potentially good candidates for biomedical applications. Since the PPY film retained significant electrical conductivity after surface modification, the effect of electrical stimulation on protein adsorption and thrombus formation was also evaluated. The covalently immobilized heparin on the PPY film was able to retain its bioactivity after 4 days of immersion in PBS. The film after long-term immersion in PBS also retained sufficient electrical conductivity for electrical stimulation still to be effective for reducing protein adsorption.
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Affiliation(s)
- Yali Li
- Department of Chemical and Environmental Engineering, National University of Singapore, Kent Ridge, Singapore 119260
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Hosseinkhani H, Tabata Y. RETRACTED: PEGylation enhances tumor targeting of plasmid DNA by an artificial cationized protein with repeated RGD sequences, Pronectin®. J Control Release 2004; 97:157-71. [PMID: 15147813 DOI: 10.1016/j.jconrel.2004.02.025] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2003] [Accepted: 02/13/2004] [Indexed: 11/22/2022]
Abstract
The objective of this study is to investigate feasibility of a non-viral gene carrier with repeated RGD sequences (Pronectin F+) in tumor targeting for gene expression. The Pronectin F+ was cationized by introducing spermine (Sm) to the hydroxyl groups to allow to polyionically complex with plasmid DNA. The cationized Pronectin F+ prepared was additionally modified with poly(ethylene glycol) (PEG) molecules which have active ester and methoxy groups at the terminal, to form various PEG-introduced cationized Pronectin F+. The cationized Pronectin F+ with or without PEGylation at different extents was mixed with a plasmid DNA of LacZ to form respective cationized Pronectin F+-plasmid DNA complexes. The plasmid DNA was electrophoretically complexed with cationized Pronectin F+ and PEG-introduced cationized Pronectin F+, irrespective of the PEGylation extent, although the higher N/P ratio of complexes was needed for complexation with the latter Pronectin F+. The molecular size and zeta potential measurements revealed that the plasmid DNA was reduced in size to about 250 nm and the charge was changed to be positive by the complexation with cationized Pronectin F+. For the complexation with PEG-introduced cationized Pronectin F+, the charge of complex became neutral being almost 0 mV with the increasing PEGylation extents, while the molecular size was similar to that of cationized Pronectin F+. When cationized Pronectin F+-plasmid DNA complexes with or without PEGylation were intravenously injected to mice carrying a subcutaneous Meth-AR-1 fibrosarcoma mass, the PEG-introduced cationized Pronectin F+-plasmid DNA complex specifically enhanced the level of gene expression in the tumor, to a significantly high extent compared with the cationized Pronectin F+-plasmid DNA complexes and free plasmid DNA. The enhanced level of gene expression depended on the percentage of PEG introduced, the N/P ratio, and the plasmid DNA dose. A fluorescent microscopic study revealed that the localization of plasmid DNA in the tumor tissue was observed only for the PEG-introduced cationized Pronectin F+-plasmid DNA complex injected. We conclude that the PEGylation of cationized Pronectin F+ is a promising way to enable the plasmid DNA to target to the tumor for gene expression.
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Affiliation(s)
- Hossein Hosseinkhani
- Department of Biomaterials, Field of Tissue Engineering, Institute for Frontier Medical Sciences, Kyoto University, 53 Kawara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan
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Takei Y, Maruyama A, Ferdous A, Nishimura Y, Kawano S, Ikejima K, Okumura S, Asayama S, Nogawa M, Hashimoto M, Makino Y, Kinoshita M, Watanabe S, Akaike T, Lemasters JJ, Sato N. Targeted gene delivery to sinusoidal endothelial cells: DNA nanoassociate bearing hyaluronan-glycocalyx. FASEB J 2004; 18:699-701. [PMID: 14977882 DOI: 10.1096/fj.03-0494fje] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Liver sinusoidal endothelial cells (SECs) possess unique receptors that recognize and internalize hyaluronic acid (HA). To develop a system for targeting foreign DNA to SECs, comb-type polycations having HA side chains were prepared by coupling HA to poly(L-lysine) (PLL). The HA-grafted-PLL copolymer (PLL-g-HA) thus formed was mixed with DNA in 154 mM NaCl to form soluble nanoassociates bearing hydrated hyaluronate shells. Agarose gel retardation assays revealed selective interaction of the PLL backbone with DNA despite the presence of polyanionic HA side chains. To determine whether the PLL-g-HA/DNA complexes were recognized by SEC HA receptors in vivo, we injected Wistar rats i.v. via the tail vein with PLL-g-HA complexed to a beta-galactosidase expression plasmid (pSV beta-Gal) labeled with 32P. One hour postinjection, >90% of the injected radioactivity remained in the liver. Administration of the PLL-g-HA complexed to an FITC-labeled DNA revealed that the carrier-DNA complex was distributed exclusively in SECs. A large number of SECs expressing beta-galactosidase was detected along the sinusoidal lining after transfection with PLL-g-HA/pSV beta-Gal. Moreover, PLL-g-HA effectively stabilized DNA triplex formation. In conclusion, the new PLL-g-HA/DNA carrier system permits targeted transfer of exogenous genes selectively to the SECs.
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Affiliation(s)
- Yoshiyuki Takei
- Department of Gastroenterology, Juntendo University School of Medicine, Toky, Japan
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24
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Meinhold D, Schweiss R, Zschoche S, Janke A, Baier A, Simon F, Dorschner H, Werner C. Hydrogel characteristics of electron-beam-immobilized poly(vinylpyrrolidone) films on poly(ethylene terephthalate) supports. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:396-401. [PMID: 15743083 DOI: 10.1021/la0353531] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A novel strategy for the preparation of thin hydrogel coatings on top of polymer bulk materials was elaborated for the example of poly(ethylene terephthalate) (PET) surfaces layered with poly(vinylpyrrolidone) (PVP). PVP layers were deposited on PET foils or SiO2 surfaces (silicon wafer or glass coverslips) precoated with PET and subsequently cross-linked by electron beam treatment. The obtained films were characterized by ellipsometry, X-ray photoelectron spectroscopy, infrared spectroscopy in attenuated total reflection, atomic force microscopy (AFM), and electrokinetic measurements. Ellipsometric experiments and AFM force-distance measurements showed that the cross-linked layers swell in aqueous solutions by a factor of about 7. Electrokinetic experiments indicated a strong hydrodynamic shielding of the charge of the underlying PET layer by the hydrogel coatings and further proved that the swollen films were stable against shear stress and variation of pH. In conclusion, electron beam cross-linking ofpreadsorbed hydrophilic polymers permits a durable fixation of swellable polymer networks on polymer supports which can be adapted to materials in a wide variety of shapes.
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Affiliation(s)
- Dorit Meinhold
- Institute of Polymer Research Dresden & The Max Bergmann Center of Biomaterials, D-01069 Dresden, Germany
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25
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Yang JM, Lin HT, Wu TH, Chen CC. Wettability and antibacterial assessment of chitosan containing radiation-induced graft nonwoven fabric of polypropylene-g-acrylic acid. J Appl Polym Sci 2003. [DOI: 10.1002/app.12787] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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26
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Hu SG, Jou CH, Yang MC. Protein adsorption, fibroblast activity and antibacterial properties of poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) grafted with chitosan and chitooligosaccharide after immobilized with hyaluronic acid. Biomaterials 2003; 24:2685-93. [PMID: 12711514 DOI: 10.1016/s0142-9612(03)00079-6] [Citation(s) in RCA: 119] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid) (PHBV) membrane was treated with ozone and grafted with acrylic acid. The resulting membranes were further grafted with chitosan (CS) or chitooligosaccharide (COS) via esterification. Afterward hyaluronic acid (HA) was immobilized onto CS- or COS-grafting membranes. The antibacterial activity of CS and COS against Staphylococus aureus, Escherichia coli, and Pseudomonas aeruginosa was preserved after HA immobilization. Among them, CS-grafted PHBV membrane showed higher antibacterial activity than COS-grafted PHBV membrane. In addition, after CS- or COS-grafting, the L929 fibroblasts attachment and protein adsorption were improved, while the cell number was decrease. After immobilizing HA, the cell proliferation was promoted, the protein adsorption was decreased, and the cell attachment was slightly lower than CS- or COS-grafting PHBV.
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Affiliation(s)
- S-G Hu
- Department of Polymer Engineering, National Taiwan University of Science and Technology, 43, SEC.4 Keelung Road, Taipei 10672, Taiwan
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27
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Park JH, Bae YH. Physicochemical properties and in vitro biocompatibility of PEO/PTMO multiblock copolymer/segmented polyurethane blends. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2003; 13:527-42. [PMID: 12182557 DOI: 10.1163/15685620260178382] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A multiblock copolymer composed of poly(ethylene oxide) (PEO) and poly(tetramethylene oxide) (PTMO) and which forms a physical hydrogel was blended with Pellethane, a commercial segmented polyurethane (SPU) developed for various biomedical devices, to provide a PEO-rich surface with improved stability. The effect of the copolymer blending was evaluated with respect to surface hydrophilicity, long-term stability, mechanical properties, in vitro protein adsorption, and platelet adhesion. A small amount of the copolymer additive (5 wt%) significantly improved surface hydrophilicity, which was then gradually enhanced by increasing the amount of the copolymer in the blends. The blend films exhibited minimal extraction of the copolymer additive when exposed to a buffer solution for 2 months at 37 degrees C, resulting in less than 1 wt% weight loss of the films even with 30 wt% content of the copolymer in the blends. Although a certain degree of alteration in the mechanical properties was observed by increasing the copolymer content, the mechanical properties were well maintained for up to 10 wt% addition of the copolymer, when compared with the bare SPU. Protein adsorption was significantly reduced with a small amount of copolymer additive as low as 5 wt%. Fibrinogen, an adhesive protein for further cellular adhesion and activation, was effectively repelled by increasing the amount of copolymer additive. The platelet adhesion test revealed that the blend film surface reduced platelet adhesion and the degree of inhibition was proportional to the content of the additive, up to 30 wt%. The high molecular weight (Mw = 66,000) and compatible chemical structure of the copolymer with SPU made the surfaces PEO-rich and stable in an aqueous environment, resulting in an enhancement of the resistance to protein adsorption and platelet adhesion without a significant deterioration in physical properties.
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Affiliation(s)
- Jae Hyung Park
- Center for Biomaterials and Biotechnology, Department of Materials Science and Engineering, Kwangju Institute of Science and Technology, South Korea
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28
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Yoo HJ, Kim HD. Properties of crosslinked blends of pellethene and multiblock polyurethane containing poly(ethylene oxide) for biomaterials. J Appl Polym Sci 2003. [DOI: 10.1002/app.13377] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Gupta B, Anjum N. Plasma and Radiation-Induced Graft Modification of Polymers for Biomedical Applications. RADIATION EFFECTS ON POLYMERS FOR BIOLOGICAL USE 2003. [DOI: 10.1007/3-540-45668-6_2] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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30
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Modification of lipid transport through a microporous PTFE membrane wall grafted with poly(ethylene glycol). Colloids Surf B Biointerfaces 2002. [DOI: 10.1016/s0927-7765(01)00323-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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31
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Zhang F, Kang ET, Neoh KG, Huang W. Modification of gold surface by grafting of poly(ethylene glycol) for reduction in protein adsorption and platelet adhesion. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2002; 12:515-31. [PMID: 11469782 DOI: 10.1163/156856201300194252] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Gold surfaces were first treated in an alkanethiol solution to form self-assembled monolayers (SAMs). The thiolated Au surface was then subjected to Ar plasma pretreatment, followed by air exposure and UV-induced graft polymerization of poly(ethylene glycol) methacrylate (PEGMA) macromonomer. In comparison with the 3-mercaptopropionic acid-2-ethylhexyl ester (MPAEE) SAM, the (3-mercaptoproply)trimethoxysilane (MPTMS) SAM on Au exhibited higher stability under the conditions of Ar plasma pretreatment. The graft concentration of the PEGMA polymer on SAM-modified Au surface increased with increasing PEGMA macromonomer concentration and UV-graft polymerization time. The modified-Au surfaces were characterized by X-ray spectroscopy (XPS), atomic force microscopy (AFM), and water contact angle measurement. The Au surface with a high concentration of grafted PEGMA polymer could completely repel protein adsorption and platelet adhesion.
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Affiliation(s)
- F Zhang
- Department of Chemical Engineering, National University of Singapore, Kent Ridge Crescent
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32
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Zhang F, Kang ET, Neoh KG, Wang P, Tan KL. Reactive coupling of poly(ethylene glycol) on electroactive polyaniline films for reduction in protein adsorption and platelet adhesion. Biomaterials 2002; 23:787-95. [PMID: 11771698 DOI: 10.1016/s0142-9612(01)00184-3] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Poly(ethylene glycol) (PEG)-coupled polyaniline (PANI) film surfaces were prepared by incorporating the chlorinie end-capped methoxy PEG (mPEGCl) of molecular weight of about 2000 onto the emeraldine (EM) base form of PANI via N-alkylation. The microstructure and composition of the mPEG-coupled PANI (mPEG-c-PANI) surfaces were characterized by atomic force microscopy, contact angle measurement and X-ray photoelectron spectroscopy. The concentration of surface-coupled mPEG increased with the increase in concentration of the mPEGCl solution. The mPEG-c-PANI film surfaces exhibited enhanced ability to repel protein adsorption, with only an moderate reduction in their electrical conductivity. The mPEG-c-PANI surface with a high concentration of coupled mPEG also exhibited good resistance towards platelet adhesion.
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Affiliation(s)
- Fu Zhang
- Department of Chemical Engineering, National University of Singapore, Singapore
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33
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Park JH, Lee KB, Kwon IC, Bae YH. PDMS-based polyurethanes with MPEG grafts: mechanical properties, bacterial repellency, and release behavior of rifampicin. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2002; 12:629-45. [PMID: 11556741 DOI: 10.1163/156856201316883458] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
PDMS-based polyurethanes (PUs) grafted with monomethoxy poly(ethylene glycol) (MPEG) were synthesized to develop a coating material for urinary catheters with a silicone surface for minimizing urinary tract infections. MPEG was grafted on PDMS-based PUs by two methods depending on the PU synthetic routes: esterification and allophanate reactions. It was confirmed from mechanical characterization that an increase of the hard segment amount enhanced the ultimate strength and Young's modulus, while reducing elongation at the end-points. The incorporation of MPEG in PDMS-based PUs induced a decrease in tensile strength and Young's modulus, and increased elongation at the break point due to its high flexibility. When hydrated in distilled water, mechanical properties of all PUs synthesized in this study deteriorated due to water absorption. It was evident from the bacterial adhesion test that PDMS-based PUs showed moderate resistance to adhesion of E. coli on their surfaces compared to Pellethane, while the incorporation of MPEG significantly enhanced repellency to bacteria, including E. coli and S. epidermidis. We also studied the release behavior of an antibiotic drug, rifampicin, from the polymeric devices fabricated by solvent evaporation. Although rifampicin is hydrophilic and soluble in pH 7.4 phosphate buffer, it showed a sustained release over 45 days from PDMS-based PUs with MPEG that were grafted on ethylene glycol residues by allophanate reaction. This release characteristic was predominantly influenced by a hydrogen bond interaction between the polymers and rifampicin, which was confirmed through an ATR-IR study. This may imply that the specific interaction is responsible for the delayed release. Considering the mechanical properties, morphologies of drug-incorporated polymeric matrices, and drug release behaviors, PDMS-based PU with MPEG that were grafted on ethylene glycol (a chain extender) residues by allophanate reaction showed better material properties for uretharal catheter coating pusposes in order to minimize urinary tract infections.
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Affiliation(s)
- J H Park
- Center for Biomaterials and Biotechnology, Department of Materials Science and Engineering, Kwangju Institute of Science and Technology, Korea
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34
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Korematsu A, Takemoto Y, Nakaya T, Inoue H. Synthesis, characterization and platelet adhesion of segmented polyurethanes grafted phospholipid analogous vinyl monomer on surface. Biomaterials 2002; 23:263-71. [PMID: 11762845 DOI: 10.1016/s0142-9612(01)00104-1] [Citation(s) in RCA: 95] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
New segmented polyurethanes (SPUs) grafted phospholipid analogous vinyl monomer, 2-(methacryloyloxy)ethyl phosphorylcholine (MPC) on surface were synthesized. The soft segment of these polyurethanes was hydroxylated poly(isoprene) diol and the hard segments were 4,4'-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol (BD). SPUs were hydroxylated by potassium peroxodisulfate and MPC was grafted on the surface of hydroxylated SPUs using di-ammonium cerium (IV) nitrate (ceric ammonium nitrate, CAN) as a radical initiator. The bulk characterization of synthesized SPUs was investigated by infrared spectroscopy (IR) and gel-permeation chromatography (GPC). The existence of phospholipid analogous groups on the surface of these SPUs was revealed by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), X-ray photoelectron spectroscopy (XPS) and contact angle measurements. The surfaces of MPC-grafted SPUs showed decreased water contact angles compared to non-grafted SPU and the presence of phosphorylcholine groups. The blood compatibilities of the new polymers were evaluated by platelet rich plasma (PRP) contact studies and viewed by scanning electron microscopy (SEM) using BioSpan and non-grafted polyurethane as references. We found that fewer platelets adhered to the MPC-grafted surfaces and that they showed less shape variation than the references. These results suggest that these grafted polymers may have the possibility of the usage for biomaterials.
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Affiliation(s)
- Arata Korematsu
- Department of Bioapplied Chemistry, Faculty of Engineering, Osaka City University, Osaka, Japan
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35
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Zhu B, Eurell T, Gunawan R, Leckband D. Chain-length dependence of the protein and cell resistance of oligo(ethylene glycol)-terminated self-assembled monolayers on gold. ACTA ACUST UNITED AC 2001; 56:406-16. [PMID: 11372059 DOI: 10.1002/1097-4636(20010905)56:3<406::aid-jbm1110>3.0.co;2-r] [Citation(s) in RCA: 114] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Oligo(ethylene glycol) (O-EG(n))-terminated alkanethiol surface-assembled monolayers (SAMs) have been reported to demonstrate protein-resistant properties similar to those of poly(ethylene glycol) (PEG). In this study, we compared the relative protein resistance of short and long ethylene oxide chains, SAMs of PEG 5000, PEG 2000, O-EG(3) (molecular weight = 120), and O-EG(6) (molecular weight = 240), on gold surfaces. Surface plasmon resonance showed that these monolayers were all protein-resistant within the uncertainty of the measurement. However, they exhibited different adhesive properties toward 3T3 mouse fibroblast adhesion in supplemented Dulbecco's modified Eagles medium. The results show that the cell adhesion was sensitive to the concentration of proteins supplemented in the culture medium and to the length of PEG chains.
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Affiliation(s)
- B Zhu
- Department of Chemical Engineering, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Urbana, IL 61801, USA
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36
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Guo S, Shen L, Feng L. Surface characterization of blood compatible amphiphilic graft copolymers having uniform poly(ethylene oxide) side chains. POLYMER 2001. [DOI: 10.1016/s0032-3861(00)00472-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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37
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Zhang F, Kang ET, Neoh KG, Wang P, Tan KL. Modification of Si(100) surface by the grafting of poly(ethylene glycol) for reduction in protein adsorption and platelet adhesion. ACTA ACUST UNITED AC 2001; 56:324-32. [PMID: 11372049 DOI: 10.1002/1097-4636(20010905)56:3<324::aid-jbm1100>3.0.co;2-p] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The modification of argon plasma-pretreated single-crystal Si(100) wafer surfaces via the UV-induced graft polymerization of poly(ethylene glycol) methacrylate (PEGMA) macromonomer (molecular weight approximately 340) for biomaterials applications was explored. The modified Si(100) surfaces were characterized by X-ray photoelectron spectroscopy and atomic force microscopy. Surface peroxide concentrations resulting from the argon plasma treatment and subsequent atmospheric exposure were determined by a coupling reaction with diphenylpicrylhydrazyl. The results suggested that a short plasma treatment time of 10 s and brief air exposure were sufficient for generating an optimum amount of peroxides and hydroperoxides for the subsequent UV-induced graft polymerization. The graft concentration of the PEGMA polymer increased with increasing PEGMA macromonomer concentration for the graft polymerization and with increasing UV graft polymerization time. The PEGMA graft-polymerized silicon surface with a high poly(ethylene glycol) graft concentration was very effective in preventing protein adsorption and platelet adhesion. The grafted PEGMA polymer layer on the Si(100) surface exhibited fairly good stability during storage in a buffer solution.
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Affiliation(s)
- F Zhang
- Department of Chemical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260
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38
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Lee WF, Chen YJ. Graft copolymerization ofN-isopropylacrylamide on styrene-butadiene-styrene block copolymer. J Appl Polym Sci 2001. [DOI: 10.1002/app.2117] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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39
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Wang P, Tan KL, Kang ET. Surface modification of poly(tetrafluoroethylene) films via grafting of poly(ethylene glycol) for reduction in protein adsorption. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2000; 11:169-86. [PMID: 10718477 DOI: 10.1163/156856200743634] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Poly(tetrafluoroethylene) (PTFE) films with surface grafted poly(ethylene glycol) (PEG) chains were prepared by two methods: (1) UV-induced graft copolymerization of methoxy poly- (ethylene glycol) monomethacrylate (PEGMA) onto the plasma-pretreated PTFE films; and (2) coupling of the hydroxyl groups of PEG via ester linkages with the carbonyl chloride groups which were introduced onto the acrylic acid (AAc) graft-copolymerized PTFE surface through reaction with thionyl chloride (SOCl2). The UV-induced graft copolymerization of PEGMA onto the plasma-pretreated PTFE film was explored with different macromonomer concentrations and different UV graft copolymerization time. The coupling reaction, on the other hand, was explored with PEG of different molecular weights. The surface microstructures and compositions of the PEG-modified PTFE films from both processes were characterized by contact angle, X-ray photoelectron spectroscopy (XPS), and atomic force microscopy (AFM) measurements. In general, higher macromonomer concentration and longer UV graft copolymerization time led to a higher graft yield for the UV-induced graft copolymerization with PEGMA. Contact angle measurements revealed that the hydrophilicity of the PTFE film surface was greatly enhanced by the grafting of the PEG chains. The PTFE surface with a high density of grafted PEG was very effective in preventing bovine serum albumin adsorption.
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Affiliation(s)
- P Wang
- Department of Physics, National University of Singapore, Singapore
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40
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Lee JH, Ju YM, Kim DM. Platelet adhesion onto segmented polyurethane film surfaces modified by addition and crosslinking of PEO-containing block copolymers. Biomaterials 2000; 21:683-91. [PMID: 10711965 DOI: 10.1016/s0142-9612(99)00197-0] [Citation(s) in RCA: 167] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Polyethylene oxide (PEO) surfaces were prepared by the addition of PEO-containing amphiphilic block copolymers as surface modifying additives and of dicumyl peroxide (DCP) as a crosslinking agent in segmented polyurethane (PU). PEO-polypropylene oxide-PEO triblock copolymers (Pluronics) with different PEO chain length (from 0 to 98) were used as the surface modifying additives. The PEO additives in the PU film were then crosslinked to be stably entrapped in the PU matrix. The crosslinking was done by free radicals produced from the decomposition of DCP in the film through heating (120 degrees C) or ultraviolet irradiation (254 nm). The surface properties of the PEO additive-entrapped PU films were investigated by the measurement of water contact angles and electron spectroscopy for chemical analysis. The bulk properties such as water absorption, long-term film stability, and tensile strength and elongation at break, were also investigated. It was observed that addition of a small amount (5 wt% based on PU) of the PEO additives resulted in a considerable change of surface characteristics. The PEO additives were stably entrapped in the PU films by crosslinking of them, without significant changes of bulk properties of the films. From the platelet adhesion test on the prepared PEO additive-containing film surfaces, it was observed that the platelet adhesion on the surfaces decreases with increase in PEO chain length of PEO additives. The film surface containing additive with long PEO chains (chain length of 98) was particularly effective in preventing platelet adhesion. The crosslinking of the PEO additives in PU films did not affect the behavior of platelet adhesion on the surfaces; the films with crosslinked PEO additives showed similar platelet adhesion on the surfaces to the films with uncrosslinked ones.
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Affiliation(s)
- J H Lee
- Department of Polymer Science and Engineering, Hannam University, Daedeog Ku, Taejon, South Korea.
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41
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Hancock LF, Fagan SM, Ziolo MS. Hydrophilic, semipermeable membranes fabricated with poly(ethylene oxide)-polysulfone block copolymer. Biomaterials 2000; 21:725-33. [PMID: 10711969 DOI: 10.1016/s0142-9612(99)00237-9] [Citation(s) in RCA: 93] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Semipermeable membranes may be fabricated from mixtures of poly(ethylene oxide)/polysulfone block copolymer (PEO-b-PSF) and polysulfone. Membranes fabricated with PEO-b-PSF possess a hydrophilic surface. PEO-b-PSF segregates to the membrane surface during phase inversion fabrication of the membrane rendering the surface hydrophilic. Changes in surface hydrophilicity were demonstrated by a dramatic reduction in the dynamic contact angle in water. With regard to the similar microporous hollow fiber membranes, a PEO-b-PSF membrane had a dynamic water contact angle of 33 degrees +/- 2 compared to a 111 degrees +/- 3 for a polysulfone membrane. Studies on porcine platelet-rich plasma in vitro demonstrated that the hydrophilic PEO-b-PSF membrane was resistant to platelet adhesion compared to a polysulfone membrane. An order of magnitude fewer adherent platelets were observed on a PEO-b-PSF membrane compared to a polysulfone membrane. The hydrophilicity of PEO-b-PSF makes it a unique material for the fabrication of membranes for medical devices.
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Affiliation(s)
- L F Hancock
- Circe Biomedical Inc., Lexington, MA 02421, USA.
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42
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Hsu SH, Chen WC. Improved cell adhesion by plasma-induced grafting of L-lactide onto polyurethane surface. Biomaterials 2000; 21:359-67. [PMID: 10656317 DOI: 10.1016/s0142-9612(99)00191-x] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Lactide-grafted polyurethanes were prepared by exposing the polyurethane films to argon plasma discharge, followed by grafting L-lactide onto the plasma-treated surface. The modified surfaces were characterized by measuring the static contact angle and by electron spectroscopy for chemical analysis (ESCA). The water contact angle of polyurethanes was decreased by L-lactide grafting, indicating hydrophilicity of the modified surface. Grafting also increased the O/C atomic ratio and C(C=O)/Ctotal percentage on the surfaces as detected by ESCA. The grafted surfaces showed enhanced attachment and growth in both 3T3 fibroblast and human umbilical vein endothelial cell culture tests. Platelet adhesion to the modified surfaces was also reduced in vitro. L-Lactide monomers grafted onto polyurethane substrates could therefore be useful in facilitating endothelial cell seeding process in small vascular graft applications.
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Affiliation(s)
- S H Hsu
- Department of Chemical Engineering, National Chung Hsing University, Taichung, Taiwan, Republic of China.
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43
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Abstract
Activation of the complement system is one way in which the human body reacts to foreign materials that come in contact with blood. Poly(ethylene oxide) (PEO) has been used quite frequently to modify biomaterial surfaces to prevent protein adsorption and cell adhesion. Despite extensive use of PEO, however, PEO-induced complement activation has not been examined before. We examined the complement activation by PEO chains grafted to glass surfaces. PEO was grafted to trichlorovinylsilane-treated glass (TCVS-glass) by gamma-irradiation using PEO homopolymer, Pluronic F108 (PF108), and PEO-polybutadiene-PEO triblock copolymer (COP5000). Complement activation was assessed by measuring the plasma C3a level. Of the three polymers grafted (PEO, PF108, and COP5000), only PF108 showed significant increases in complement activation over controls. Complement C3a production on PF108-grafted glass was linearly dependent on surface concentration of grafted PF108. The C3a concentration increased from 46 ng/mL to 316 ng/mL as the surface PF108 concentration increased from 0-0.25 microg/cm(2). Kinetics of C3a generation by PF108-grafted surfaces show that 60% of the steady state C3a concentration was generated during the first hour of plasma exposure. When the same PF108-grafted glass surface was repeatedly exposed to fresh plasma, the amount of C3a generated decreased by 70% after the first exposure. This supports the "single-hit" mechanism in complement activation. PEO homopolymer did not activate complement in bulk solution, and, thus, it appears that C3a complement activation by PF108-grafted surfaces is due to the presence of poly(propylene oxide) units. Grafting of PEO using PEO-containing block copolymers requires examination of complement activating properties of the non-PEO segment.
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Affiliation(s)
- A Kidane
- Purdue University, School of Pharmacy, West Lafayette, Indiana 47907, USA
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Yang JM, Ping Chang Chian C, Hsu KY. Oxygen permeation in SBS-g-DMAEMA copolymer membrane prepared by UV photografting without degassing. J Memb Sci 1999. [DOI: 10.1016/s0376-7388(98)00261-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Saito N, Matsuda T. Protein adsorption on self-assembled monolayers with water-soluble non-ionic oligomers using quartz-crystal microbalance. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 1998. [DOI: 10.1016/s0928-4931(98)00060-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Chen JH, Wei J, Chang CY, Laiw RF, Lee YD. Studies on segmented polyetherurethane for biomedical application: effects of composition and hard-segment content on biocompatibility. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1998; 41:633-48. [PMID: 9697037 DOI: 10.1002/(sici)1097-4636(19980915)41:4<633::aid-jbm16>3.0.co;2-f] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Segmented polyetherurethane (SPEU) materials based on polytetramethylene oxide (PTMO, Mw 1000 and 2000) with various hard-segment contents were synthesized and their biocompatibilities studied via different tests. The static contact angle data reveal that the higher hard-segment-content SPEU material possesses a lower contact angle, implying that the surface of the higher hard-segment-content SPEU is more hydrophilic than its low hard-segment-content SPEU counterpart. The catalyst- and additive-free PTMO-based SPEU materials in this study possess neither a hemolytic nor a cytotoxic response that could be considered non toxic for biomedical applications. By using L-929 cell lines, a cell-seeding test indicated that the higher hard-segment-content SPEU material possesses quicker cell attachment and proliferation behaviors. In vitro platelet adhesion tests indicated that the lower hard-segment-content SPEU possesses less platelet adhesion than the high hard-segment-content SPEU material. Both ex vivo canine artery-artery (A-A) and arterio-venous (A-V) shunting tests revealed that the extent of platelet adhesion reaction is less for lower hard-segment content SPEU. In addition, the blood compatibility of SPEU material synthesized from PTMO 1000 excels over PTMO 2000 SPEU material by near the same levels as the hard-segment-content SPEU.
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Affiliation(s)
- J H Chen
- Union Chemical Laboratories (UCL), Industrial Technology Research Institute (ITRI), Hsinchu, Taiwan, Republic of China
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Lee JH, Ju YM, Lee WK, Park KD, Kim YH. Platelet adhesion onto segmented polyurethane surfaces modified by PEO- and sulfonated PEO-containing block copolymer additives. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1998; 40:314-23. [PMID: 9549627 DOI: 10.1002/(sici)1097-4636(199805)40:2<314::aid-jbm17>3.0.co;2-l] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Polyethylene oxide (PEO) surfaces were prepared by the addition of PEO- and sulfonated PEO-containing amphiphilic block copolymers as surface-modifying additives in a segmented polyurethane (PU). PEO-PPO-PEO triblock copolymers (Pluronics) with different PEO chain lengths (from 2 to 80) were used as additives. The prepared film surfaces were characterized by the measurement of dynamic water contact angles and electron spectroscopy for chemical analysis. It was observed that the PU films containing 10 wt% of PEO additives were surface-saturated with the additives regardless of their PEO chain length, but the PEO chains were more projected from the film surfaces containing the additives with longer PEO chains. The water absorption of the films increased largely with the increasing PEO chain length of the additives. The addition of PEO additives produced film surfaces that were in a gel-like state. The films demonstrated some extraction of the PEO additives. However, the additives with higher molecular weights were entrapped more stably into the PU matrix. The mechanical properties (tensile strength and elongation) of the films were changed by the addition of PEO additives, but the differences were not significant compared to the control PU. The platelet adhesion on the film surfaces decreased with increasing PEO chain length of the additives. The film surface containing additives with long PEO chains (chain length of 80) was particularly effective in preventing platelet adhesion. The effect of negatively charged sulfonate groups on the prevention of platelet adhesion appeared only on the film surfaces containing additives with short PEO chains. For longer PEO chains, the chain mobility effect was more dominant than the negative charge effect on the prevention of platelet adhesion.
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Affiliation(s)
- J H Lee
- Department of Macromolecular Science, Hannam University, Taejon, Korea
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Yang JM, Jong YJ, Hsu KY, Chang CH. Preparation and characterization of heparin-containing SBS-g-DMAEMA copolymer membrane. JOURNAL OF BIOMEDICAL MATERIALS RESEARCH 1998; 39:86-91. [PMID: 9429100 DOI: 10.1002/(sici)1097-4636(199801)39:1<86::aid-jbm11>3.0.co;2-m] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The grafting of dimethyl amino ethyl methacrylate (DMAEMA) onto styrene-butadiene-styrene triblock copolymer (SBS) membrane was subsequently conducted by UV-radiation induced graft copolymerization without degassing to obtain the SBS-g-DMAEMA copolymer membrane. The substituted amino groups on the SBS-g-DMAEMA graft copolymer membrane were quaternized with iodomethane, and then the membrane was treated with heparin to prepare the heparin-containing SBS-g-DMAEMA copolymer membrane (SBS-g-DMAEMA-HEP). The graft copolymer membrane (SBS-g-DMAEMA) and the heparin-containing SBS-g-DMAEMA copolymer membrane (SBS-g-DMAEMA-HEP) were characterized by FTIR spectroscopy. The heparin content was determined by toluidine blue heparin assay. Contact angle, water content, and protein adsorption of fibrinogen and albumin experiments were also performed to evaluate the effect of graft amount and heparin content on the biocompatibility of SBS-g-DMAEMA and SBS-g-DMAEMA-HEP graft copolymer membranes. By using Kaelble's equation, the surface tension of SBS-g-DMAEMA and SBS-g-DMAEMA-HEP were determined. It was found that with increasing grafting amount and the heparin content, the surface tension and water content of SBS-g-DMAEMA membrane increased, whereas the contact angle decreased. The amount of the adsorption of albumin and fibrinogen decreased with increasing graft amount and heparin content. However, there was a minimum for adsorption of proteins in the SBS-g-DMAEMA and SBS-g-DMAEMA-HEP membranes.
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Affiliation(s)
- J M Yang
- Department of Chemical Engineering, Chang Gung College of Medicine and Technology, Tao-Yuan, Taiwan, R.O.C
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Yang J, Wang M, Hsu Y, Chang C. The properties of SBS-g-VP copolymer membrane prepared by UV photografting without degassing. J Memb Sci 1997. [DOI: 10.1016/s0376-7388(96)00312-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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