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Yan H, Cheng Q, Si J, Wang S, Wan Y, Kong X, Wang T, Zheng W, Rafique M, Li X, He J, Midgley AC, Zhu Y, Wang K, Kong D. Functionalization of in vivo tissue-engineered living biotubes enhance patency and endothelization without the requirement of systemic anticoagulant administration. Bioact Mater 2023; 26:292-305. [PMID: 36950151 PMCID: PMC10027480 DOI: 10.1016/j.bioactmat.2023.03.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 02/19/2023] [Accepted: 03/05/2023] [Indexed: 03/18/2023] Open
Abstract
Vascular regeneration and patency maintenance, without anticoagulant administration, represent key developmental trends to enhance small-diameter vascular grafts (SDVG) performance. In vivo engineered autologous biotubes have emerged as SDVG candidates with pro-regenerative properties. However, mechanical failure coupled with thrombus formation hinder translational prospects of biotubes as SDVGs. Previously fabricated poly(ε-caprolactone) skeleton-reinforced biotubes (PBs) circumvented mechanical issues and achieved vascular regeneration, but orally administered anticoagulants were required. Here, highly efficient and biocompatible functional modifications were introduced to living cells on PB lumens. The 1,2-dimyristoyl-sn-glycero-3-phosphoethanolamine-N-methoxy (DMPE)-PEG-conjugated anti-coagulant bivalirudin (DPB) and DMPE-PEG-conjugated endothelial progenitor cell (EPC)-binding TPS-peptide (DPT) modifications possessed functionality conducive to promoting vascular graft patency. Co-modification of DPB and DPT swiftly attained luminal saturation without influencing cell viability. DPB repellent of non-specific proteins, DPB inhibition of thrombus formation, and DPB protection against functional masking of DPT's EPC-capture by blood components, which promoted patency and rapid endothelialization in rat and canine artery implantation models without anticoagulant administration. This strategy offers a safe, facile, and fast technical approach to convey additional functionalization to living cells within tissue-engineered constructs.
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Affiliation(s)
- Hongyu Yan
- Key Laboratory of Bioactive Materials for the Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
- Department of Ultrasound in Medicine, Shanghai Sixth People's Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai, 200233, China
| | - Quhan Cheng
- Key Laboratory of Bioactive Materials for the Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Jianghua Si
- Key Laboratory of Bioactive Materials for the Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Songdi Wang
- Key Laboratory of Bioactive Materials for the Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Ye Wan
- Key Laboratory of Bioactive Materials for the Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Xin Kong
- Key Laboratory of Bioactive Materials for the Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Ting Wang
- Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, China
| | - Wenting Zheng
- State Key Laboratory of Experimental Hematology, National Clinical Research Center for Blood Diseases, Chinese Academy of Medical Sciences & Peking Union Medical College, Tianjin, 300020, China
| | - Muhammad Rafique
- Key Laboratory of Bioactive Materials for the Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
| | - Xiaofeng Li
- Department of Vascular Surgery, Tianjin First Central Hospital, Nankai University, Tianjin, 300192, China
| | - Ju He
- Department of Vascular Surgery, Tianjin First Central Hospital, Nankai University, Tianjin, 300192, China
| | - Adam C. Midgley
- Key Laboratory of Bioactive Materials for the Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
- Corresponding author.
| | - Yi Zhu
- Department of Physiology and Pathophysiology, Tianjin Medical University, Tianjin, 300070, China
| | - Kai Wang
- Key Laboratory of Bioactive Materials for the Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
- Corresponding author.
| | - Deling Kong
- Key Laboratory of Bioactive Materials for the Ministry of Education, College of Life Sciences, Nankai University, Tianjin, 300071, China
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2
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Liu Z, Zhang Y, Zhou Q, Chen R, Guo S. Surface modification of
PTFE
/
SiO
2
composite films through the deposition of polydopamine (
PDA
) and the modified adhesive properties. J Appl Polym Sci 2022. [DOI: 10.1002/app.52153] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhiyu Liu
- The State Key Laboratory of Polymer Materials Engineering, Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing Technology Polymer Research Institute of Sichuan University Chengdu China
| | - Yao Zhang
- The State Key Laboratory of Polymer Materials Engineering, Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing Technology Polymer Research Institute of Sichuan University Chengdu China
| | - Qian Zhou
- The State Key Laboratory of Polymer Materials Engineering, Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing Technology Polymer Research Institute of Sichuan University Chengdu China
| | - Rong Chen
- The State Key Laboratory of Polymer Materials Engineering, Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing Technology Polymer Research Institute of Sichuan University Chengdu China
| | - Shaoyun Guo
- The State Key Laboratory of Polymer Materials Engineering, Sichuan Provincial Engineering Laboratory of Plastic/Rubber Complex Processing Technology Polymer Research Institute of Sichuan University Chengdu China
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3
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Fluorine-containing bio-inert polymers: Roles of intermediate water. Acta Biomater 2022; 138:34-56. [PMID: 34700043 DOI: 10.1016/j.actbio.2021.10.027] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 10/06/2021] [Accepted: 10/18/2021] [Indexed: 12/13/2022]
Abstract
Fluorine-containing polymers are used not only in industrial processes but also in medical applications, because they exhibit excellent heat, weather, and chemical resistance. As these polymers are not easily degraded in our body, it is difficult to use them in applications that require antithrombotic properties, such as artificial blood vessels. The material used for medical applications should not only be stable in vivo, but it should also be inert to biomolecules such as proteins or cells. In this review, this property is defined as "bio-inert," and previous studies in this field are summarized. Bio-inert materials are less recognized as foreign substances by proteins or cells in the living body, and they must be covered at interfaces designed with the concept of intermediate water (IW). On the basis of this concept, we present here the current understanding of bio-inertness and unusual blood compatibility found in fluoropolymers used in biomedical applications. IW is the water that interacts with materials with moderate strength and has been quantified by a variety of analytical methods and simulations. For example, by using differential scanning calorimetry (DSC) measurements, IW was defined as water frozen at around -40°C. To consider the role of the IW, quantification methods of the hydration state of polymers are also summarized. These investigations have been conducted independently because of the conflict between hydrophobic fluorine and bio-inert properties that require hydrophilicity. In recent years, not many materials have been developed that incorporate the good points of both aspects, and their properties have seldom been linked to the hydration state. This has been critically performed now. Furthermore, fluorine-containing polymers in medical use are reviewed. Finally, this review also describes the molecular design of the recently reported fluorine-containing bio-inert polymers for controlling their hydration state. STATEMENT OF SIGNIFICANCE: A material covered with a hydration layer known as intermediate water that interacts moderately with other objects is difficult to be recognized as a foreign substance and exhibits bio-inert properties. Fluoropolymers show high durability, but conflict with bio-inert characteristics requiring hydrophilicity as these research studies have been conducted independently. On the other hand, materials that combine the advantages of both hydrophobic and hydrophilic features have been developed recently. Here, we summarize the molecular architecture and analysis methods that control intermediate water and provide a guideline for designing novel fluorine-containing bio-inert materials.
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Badv M, Bayat F, Weitz JI, Didar TF. Single and multi-functional coating strategies for enhancing the biocompatibility and tissue integration of blood-contacting medical implants. Biomaterials 2020; 258:120291. [PMID: 32798745 DOI: 10.1016/j.biomaterials.2020.120291] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 06/27/2020] [Accepted: 08/01/2020] [Indexed: 12/27/2022]
Abstract
Device-associated clot formation and poor tissue integration are ongoing problems with permanent and temporary implantable medical devices. These complications lead to increased rates of mortality and morbidity and impose a burden on healthcare systems. In this review, we outline the current approaches for developing single and multi-functional surface coating techniques that aim to circumvent the limitations associated with existing blood-contacting medical devices. We focus on surface coatings that possess dual hemocompatibility and biofunctionality features and discuss their advantages and shortcomings to providing a biocompatible and biodynamic interface between the medical implant and blood. Lastly, we outline the newly developed surface modification techniques that use lubricant-infused coatings and discuss their unique potential and limitations in mitigating medical device-associated complications.
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Affiliation(s)
- Maryam Badv
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada; Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, Canada
| | - Fereshteh Bayat
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada
| | - Jeffrey I Weitz
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada; Thrombosis & Atherosclerosis Research Institute (TaARI), Hamilton, Ontario, Canada; Department of Medicine, McMaster University, Hamilton, Ontario, Canada; Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Tohid F Didar
- School of Biomedical Engineering, McMaster University, Hamilton, Ontario, Canada; Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, Canada; Institute for Infectious Disease Research (IIDR), McMaster University, Hamilton, Ontario, Canada.
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5
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Valencia-Rivero KT, Cruz JC, Wagner-Gutierrez N, D’Amore A, Miranda MC, López R, Guerrero A, Wagner W, Sandoval N, Briceño JC. Evaluation of Microscopic Structure−Function Relationships of PEGylated Small Intestinal Submucosa Vascular Grafts for Arteriovenous Connection. ACS APPLIED BIO MATERIALS 2019; 2:3706-3721. [DOI: 10.1021/acsabm.9b00158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Juan C. Cruz
- Biomedical Engineering Department, Universidad de los Andes, Bogotá, Colombia
| | | | - Antonio D’Amore
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
- Fondazione RiMED, Palermo, Italy
| | - Maria C. Miranda
- Fundación Cardioinfantil - Cardiovascular Institution, Bogotá, Colombia
| | - Rocío López
- Fundación Santa Fe de Bogotá, Bogotá, Colombia
- School of Medicine, Universidad de los Andes, Bogotá, Colombia
| | - Albert Guerrero
- Fundación Cardioinfantil - Cardiovascular Institution, Bogotá, Colombia
| | - William Wagner
- McGowan Institute for Regenerative Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Néstor Sandoval
- Fundación Cardioinfantil - Cardiovascular Institution, Bogotá, Colombia
| | - Juan C. Briceño
- Biomedical Engineering Department, Universidad de los Andes, Bogotá, Colombia
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6
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Feng S, Zhong Z, Wang Y, Xing W, Drioli E. Progress and perspectives in PTFE membrane: Preparation, modification, and applications. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2017.12.032] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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7
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Yoshida C, Uchida Y, Ito T, Takami T, Murakami Y. Chitosan Gel Sheet Containing Polymeric Micelles: Synthesis and Gelation Properties of PEG-Grafted Chitosan. MATERIALS 2017; 10:ma10091075. [PMID: 28902160 PMCID: PMC5615729 DOI: 10.3390/ma10091075] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Revised: 09/12/2017] [Accepted: 09/12/2017] [Indexed: 01/06/2023]
Abstract
Wound-dressing sheet biomaterials can cover wound sites and enhance wound healing. In this study, a detailed evaluation of the factors affecting both the PEG modification percentage (PMP) in poly(ethylene glycol) (PEG)-grafted chitosan synthesis and the gelation properties of PEG-grafted chitosan was presented for constructing our novel hybrid hydrogel sheet consisting of PEG-grafted chitosan (a gel-forming polymer) and a reactive polymeric micelle (a crosslinker). It was confirmed that various factors (i.e., the weight ratio of PEG/chitosan, the pH of the buffer solution, reaction times, and reaction temperatures) in the preparation stage of PEG-grafted chitosans affected the PMP of PEG-grafted chitosans. Furthermore, the PMP of PEG-grafted chitosans affected their gelation properties. Finally, a ‘flexible’ hydrogel sheet that can be reversibly dried and moistened was successfully obtained. The dried rigid, thin sheet is expected to be suitable for stable preservation. The results obtained in this paper show that the incorporation of drug carriers into biomaterials is a novel approach to improve functionality.
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Affiliation(s)
- Chikara Yoshida
- Department of Organic and Polymer Materials Chemistry, Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
| | - Yusuke Uchida
- Department of Organic and Polymer Materials Chemistry, Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
| | - Tomoki Ito
- Department of Organic and Polymer Materials Chemistry, Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
| | - Taku Takami
- Department of Organic and Polymer Materials Chemistry, Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
| | - Yoshihiko Murakami
- Department of Organic and Polymer Materials Chemistry, Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
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8
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Kearns VR, Tasker J, Akhtar R, Bachhuka A, Vasilev K, Sheridan CM, Williams RL. The formation of a functional retinal pigment epithelium occurs on porous polytetrafluoroethylene substrates independently of the surface chemistry. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2017; 28:124. [PMID: 28707136 PMCID: PMC5509835 DOI: 10.1007/s10856-017-5926-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Accepted: 06/13/2017] [Indexed: 06/07/2023]
Abstract
Subretinal transplantation of functioning retinal pigment epithelial (RPE) cells may have the potential to preserve or restore vision in patients affected by blinding diseases such as age-related macular degeneration (AMD). One of the critical steps in achieving this is the ability to grow a functioning retinal pigment epithelium, which may need a substrate on which to grow and to aid transplantation. Tailoring the physical and chemical properties of the substrate should help the engineered tissue to function in the long term. The purpose of the study was to determine whether a functioning monolayer of RPE cells could be produced on expanded polytetrafluoroethylene substrates modified by either an ammonia plasma treatment or an n-Heptylamine coating, and whether the difference in surface chemistries altered the extracellular matrix the cells produced. Primary human RPE cells were able to form a functional, cobblestone monolayer on both substrates, but the formation of an extracellular matrix to exhibit a network structure took months, whereas on non-porous substrates with the same surface chemistry, a similar appearance was observed after a few weeks. This study suggests that the surface chemistry of these materials may not be the most critical factor in the development of growth of a functional monolayer of RPE cells as long as the cells can attach and proliferate on the surface. This has important implications in the design of strategies to optimise the clinical outcomes of subretinal transplant procedures.
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Affiliation(s)
- Victoria R Kearns
- Department of Eye and Vision Science, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool, UK.
| | - Jack Tasker
- Department of Mechanical, Materials and Aerospace Engineering, School of Engineering, University of Liverpool, Liverpool, UK
| | - Riaz Akhtar
- Department of Mechanical, Materials and Aerospace Engineering, School of Engineering, University of Liverpool, Liverpool, UK
| | - Akash Bachhuka
- School of Engineering, University of South Australia, Mawson Lakes, Adelaide, SA, 5095, Australia
| | - Krasimir Vasilev
- School of Engineering, University of South Australia, Mawson Lakes, Adelaide, SA, 5095, Australia
| | - Carl M Sheridan
- Department of Eye and Vision Science, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool, UK
| | - Rachel L Williams
- Department of Eye and Vision Science, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool, UK
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9
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Jin YJ, Kang S, Park P, Choi D, Kim DW, Jung D, Koh J, Jeon J, Lee M, Ham J, Seo JH, Jin HR, Lee Y. Anti-inflammatory and Antibacterial Effects of Covalently Attached Biomembrane-Mimic Polymer Grafts on Gore-Tex Implants. ACS APPLIED MATERIALS & INTERFACES 2017; 9:19161-19175. [PMID: 28557438 DOI: 10.1021/acsami.7b02696] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Expanded polytetrafluoroethylene (ePTFE), also known as Gore-Tex, is widely used as an implantable biomaterial in biomedical applications because of its favorable mechanical properties and biochemical inertness. However, infection and inflammation are two major complications with ePTFE implantations, because pathogenic bacteria can inhabit the microsized pores, without clearance by host immune cells, and the limited biocompatibility can induce foreign body reactions. To minimize these complications, we covalently grafted a biomembrane-mimic polymer, poly(2-methacryloyloxylethyl phosphorylcholine) (PMPC), by partial defluorination followed by UV-induced polymerization with cross-linkers on the ePTFE surface. PMPC grafting greatly reduced serum protein adsorption as well as fibroblast adhesion on the ePTFE surface. Moreover, the PMPC-grafted ePTFE surface exhibited a dramatic inhibition of the adhesion and growth of Staphylococcus aureus, a typical pathogenic bacterium in ePTFE implants, in the porous network. On the basis of an analysis of immune cells and inflammation-related factors, i.e., transforming growth factor-β (TGF-β) and myeloperoxidase (MPO), we confirmed that inflammation was efficiently alleviated in tissues around PMPC-grafted ePTFE plates implanted in the backs of rats. Covalent PMPC may be an effective strategy for promoting anti-inflammatory and antibacterial functions in ePTFE implants and to reduce side effects in biomedical applications of ePTFE.
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Affiliation(s)
- Young Ju Jin
- Department of Otolaryngology-Head and Neck Surgery, Seoul National University Boramae Medical Center , 5 Gil 20, Boramae-ro, Dongjak-Gu, Seoul 156-707, Republic of Korea
| | - Sunah Kang
- Department of Chemistry, College of Natural Sciences, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-747, Republic of Korea
| | - Pona Park
- Department of Otolaryngology-Head and Neck Surgery, Seoul National University Boramae Medical Center , 5 Gil 20, Boramae-ro, Dongjak-Gu, Seoul 156-707, Republic of Korea
| | - Dongkil Choi
- Department of Chemistry, College of Natural Sciences, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-747, Republic of Korea
| | - Dae Woo Kim
- Department of Otolaryngology-Head and Neck Surgery, Seoul National University Boramae Medical Center , 5 Gil 20, Boramae-ro, Dongjak-Gu, Seoul 156-707, Republic of Korea
| | - Dongwook Jung
- Department of Chemistry, College of Natural Sciences, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-747, Republic of Korea
| | - Jaemoon Koh
- Department of Pathology, Seoul National University Hospital, Seoul National University College of Medicine , 101 Daehak-ro, Jongno-gu, Seoul 110-744, Republic of Korea
| | - Joohee Jeon
- Department of Chemistry, College of Natural Sciences, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-747, Republic of Korea
| | - Myoungjin Lee
- Department of Materials Science and Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea
| | - Jiyeon Ham
- Department of Chemistry, College of Natural Sciences, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-747, Republic of Korea
| | - Ji-Hun Seo
- Department of Materials Science and Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 136-701, Republic of Korea
| | - Hong-Ryul Jin
- Department of Otolaryngology-Head and Neck Surgery, Seoul National University Boramae Medical Center , 5 Gil 20, Boramae-ro, Dongjak-Gu, Seoul 156-707, Republic of Korea
| | - Yan Lee
- Department of Chemistry, College of Natural Sciences, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 151-747, Republic of Korea
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10
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Anzai R, Murakami Y. Poly(ɛ-caprolactone) (PCL)-polymeric micelle hybrid sheets for the incorporation and release of hydrophilic proteins. Colloids Surf B Biointerfaces 2015; 127:292-9. [PMID: 25723105 DOI: 10.1016/j.colsurfb.2015.01.028] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Revised: 01/15/2015] [Accepted: 01/19/2015] [Indexed: 01/11/2023]
Abstract
Sheets have several advantages over conventional gel- or particle-type drug carriers. Sheets have several notable attributes: sheets' size and shape are easily adjustable, sheets are highly accessible in surgery, and sheets have a large contact area relative to drug-targeting sites. However, it is difficult to incorporate hydrophilic proteins into hydrophobic sheets and to release the proteins over the long term in a sustained manner. In the present study, we show that "poly(ɛ-caprolactone) (PCL)-polymeric micelle hybrid sheets" can be used for the incorporation and release of hydrophilic proteins. Polymeric micelles (i.e., spaces that can incorporate hydrophilic compounds) are, in this study, uniformly dispersed in hydrophobic and biocompatible biomaterial sheet. We have clarified that the composition of block copolymer, methoxy-terminated poly(ethylene glycol)-block-poly(ɛ-caprolactone) (CH3O-PEG-b-PCL), can affect two variables: the stability of w/o emulsion and the release properties of the resulting sheets, by means of visual qualitative observations, newly developed quantitative analyses (advanced fractal analysis, advanced FD) based on deviation of the fractal dimension (FD), and release experiments. We clarified that the release behavior of BSA was affected by the composition of the block copolymers and the resulting emulsion. The results obtained in this paper show that the hydrophobic sheets in which polymeric micelles providing hydrophilic spaces were dispersed could be an effective platform for incorporating and releasing hydrophilic proteins.
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Affiliation(s)
- Ryosuke Anzai
- Department of Organic and Polymer Materials Chemistry, Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Yoshihiko Murakami
- Department of Organic and Polymer Materials Chemistry, Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan.
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11
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Xiang T, Lu T, Wang R, Wang C, Sun SD, He HB, Zhao CS. Improved antifouling properties and blood compatibility of 3-methacryloxypropyl trimethoxysilane – based zwitterionic copolymer modified composite membranes via in situ post-crosslinking copolymerization. RSC Adv 2015. [DOI: 10.1039/c4ra14755c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
In the present study, a new method to prepare stable antifouling and blood compatible membranes is developed, i.e., in situ post-crosslinking copolymerization.
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Affiliation(s)
- Tao Xiang
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Ting Lu
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Rui Wang
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Cheng Wang
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Shu-Dong Sun
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
| | - Hong-Bo He
- West China Hospital
- Sichuan University
- Chengdu 610041
- China
| | - Chang-Sheng Zhao
- College of Polymer Science and Engineering
- State Key Laboratory of Polymer Materials Engineering
- Sichuan University
- Chengdu 610065
- China
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12
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Xiang T, Wang R, Qin H, Xiang H, Su BH, Zhao CS. Excellent biocompatible polymeric membranes prepared via layer-by-layer self-assembly. J Appl Polym Sci 2014. [DOI: 10.1002/app.41245] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Tao Xiang
- College of Polymer Science and Engineering; State Key Laboratory of Polymer Materials Engineering, Sichuan University; Chengdu 610065 China
| | - Rui Wang
- College of Polymer Science and Engineering; State Key Laboratory of Polymer Materials Engineering, Sichuan University; Chengdu 610065 China
| | - Hui Qin
- College of Polymer Science and Engineering; State Key Laboratory of Polymer Materials Engineering, Sichuan University; Chengdu 610065 China
| | - Hui Xiang
- Hubei Minzu University; Enshi 445000 China
| | - Bai-Hai Su
- Department of Nephrology; West China Hospital, Sichuan University; Chengdu 610041 China
| | - Chang-Sheng Zhao
- College of Polymer Science and Engineering; State Key Laboratory of Polymer Materials Engineering, Sichuan University; Chengdu 610065 China
- National Engineering Research Center for Biomaterials; Sichuan University; Chengdu 610064 China
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13
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Ito T, Yoshida C, Murakami Y. Design of novel sheet-shaped chitosan hydrogel for wound healing: A hybrid biomaterial consisting of both PEG-grafted chitosan and crosslinkable polymeric micelles acting as drug containers. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:3697-703. [DOI: 10.1016/j.msec.2013.04.056] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2012] [Revised: 04/22/2013] [Accepted: 04/27/2013] [Indexed: 10/26/2022]
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14
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A novel recombinant bioadhesive designed from the non-repeating region of Perna viridis foot protein-1. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2012. [DOI: 10.1016/j.msec.2012.04.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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15
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Punshon G, Vara DS, Sales KM, Seifalian AM. The long-term stability in gene expression of human endothelial cells permits the production of large numbers of cells suitable for use in regenerative medicine. Biotechnol Appl Biochem 2011; 58:371-5. [DOI: 10.1002/bab.48] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2011] [Accepted: 08/12/2011] [Indexed: 02/06/2023]
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Takke V, Behary N, Perwuelz A, Campagne C. Surface and adhesion properties of poly(ethylene glycol) on polyester(polyethylene terephthalate) fabric surface: Effect of air-atmospheric plasma treatment. J Appl Polym Sci 2011. [DOI: 10.1002/app.34403] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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17
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Yang Q, Adrus N, Tomicki F, Ulbricht M. Composites of functional polymeric hydrogels and porous membranes. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm02234a] [Citation(s) in RCA: 163] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Dong B, Manolache S, Wong ACL, Denes FS. Antifouling ability of polyethylene glycol of different molecular weights grafted onto polyester surfaces by cold plasma. Polym Bull (Berl) 2010. [DOI: 10.1007/s00289-010-0358-y] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Wang S, Gupta AS, Sagnella S, Barendt PM, Kottke-Marchant K, Marchant RE. Biomimetic fluorocarbon surfactant polymers reduce platelet adhesion on PTFE/ePTFE surfaces. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2009; 20:619-35. [PMID: 19323880 PMCID: PMC2852637 DOI: 10.1163/156856209x426439] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We describe a series of fluorocarbon surfactant polymers designed as surface-modifying agents for improving the thrombogenicity of ePTFE vascular graft materials by the reduction of platelet adhesion. The surfactant polymers consist of a poly(vinyl amine) backbone with pendent dextran and perfluoroundecanoyl branches. Surface modification is accomplished by a simple dip-coating process in which surfactant polymers undergo spontaneous surface-induced adsorption and assembly on PTFE/ePTFE surface. The adhesion stability of the surfactant polymer on PTFE was examined under dynamic shear conditions in PBS and human whole blood with a rotating disk system. Fluorocarbon surfactant polymer coatings with three different dextran to perfluorocarbon ratios (1:0.5, 1:1 and 1:2) were compared in the context of platelet adhesion on PTFE/ePTFE surface under dynamic flow conditions. Suppression of platelet adhesion was achieved for all three coated surfaces over the shear-stress range of 0-75 dyn/cm2 in platelet-rich plasma (PRP) or human whole blood. The effectiveness depended on the surfactant polymer composition such that platelet adhesion on coated surfaces decreased significantly with increasing fluorocarbon branch density at 0 dyn/cm2. Our results suggest that fluorocarbon surfactant polymers can effectively suppress platelet adhesion and demonstrate the potential application of the fluorocarbon surfactant polymers as non-thrombogenic coatings for ePTFE vascular grafts.
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Affiliation(s)
- Shuwu Wang
- NanoMimetics, Inc., 1768 E. 25th Street, Cleveland, OH 44114, USA.
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HUANG N, LENG Y, YANG P, WANG J, CHEN J, WAN G. Biomedical Applications of Plasma and Ion Beam Processing. ACTA ACUST UNITED AC 2008. [DOI: 10.3131/jvsj2.51.81] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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23
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Sakthi Kumar D, Fujioka M, Asano K, Shoji A, Jayakrishnan A, Yoshida Y. Surface modification of poly(ethylene terephthalate) by plasma polymerization of poly(ethylene glycol). JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2007; 18:1831-5. [PMID: 17483899 DOI: 10.1007/s10856-007-3033-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2005] [Accepted: 05/05/2006] [Indexed: 05/15/2023]
Abstract
Poly(ethylene glycol) (PEG) was 'polymerized' onto poly(ethylene terephthalate) (PET) surface by radio frequency (RF) plasma polymerization of PEG (average molecular weight 200 Da) at a monomer vapour partial pressure of 10 Pa. Thin films strongly adherent onto PET could be produced by this method. The modified surface was characterized by infra red (IR) spectroscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), cross-cut test, contact angle measurements and static platelet adhesion studies. The modified surface, believed to be extensively cross-linked, however showed all the chemical characteristics of PEG. The surface was found to be highly hydrophilic as evidenced by an interfacial free energy of about 0.7 dynes/cm. AFM studies showed that the surface of the modified PET became smooth by the plasma polymerized deposition. Static platelet adhesion studies using platelet rich plasma (PRP) showed considerably reduced adhesion of platelets onto the modified surface by SEM. Plasma 'polymerization' of a polymer such as PEG onto substrates may be a novel and interesting strategy to prepare PEG-like surfaces on a variety of substrates since the technique allows the formation of thin, pin-hole free, strongly adherent films on a variety of substrates.
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Affiliation(s)
- D Sakthi Kumar
- REDS Group, Saitama Small Enterprise Promotion Corporation, SKIP City, Kawaguchi, Japan
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Park SJ, Lee HY. Effect of atmospheric-pressure plasma on adhesion characteristics of polyimide film. J Colloid Interface Sci 2006; 285:267-72. [PMID: 15797422 DOI: 10.1016/j.jcis.2004.11.062] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2004] [Accepted: 11/29/2004] [Indexed: 10/25/2022]
Abstract
In this work, the effect of atmospheric-pressure plasma treatments on surface properties of polyimide film are investigated in terms of X-ray photoelectron spectroscopy (XPS), contact angles, and atomic force microscopy (AFM). The adhesion characteristics of the film are also studied in the peel strengths of polyimide/copper film. As experimental results, the polyimide surfaces treated by plasma lead to an increase of oxygen-containing functional groups or the polar component of the surface free energy, resulting in improving the adhesion characteristics of the polyimide/copper foil. Also, the roughness of the film surfaces, confirmed by AFM observation, is largely increased. These results can be explained by the fact that the atmospheric-pressure plasma treatment of polyimide surface yields several oxygen complexes in hydrophobic surfaces, which can play an important role in increasing the surface polarity, wettability, and the adhesion characteristics of the polyimide/copper system.
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Affiliation(s)
- Soo-Jin Park
- Advanced Materials Division, Korea Research Institute of Chemical Technology, P.O. Box 107, Yusong, Daejeon 305-600, South Korea.
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Kim TG, Park TG. Biomimicking Extracellular Matrix: Cell Adhesive RGD Peptide Modified Electrospun Poly(D,L-lactic-co-glycolic acid) Nanofiber Mesh. ACTA ACUST UNITED AC 2006; 12:221-33. [PMID: 16548681 DOI: 10.1089/ten.2006.12.221] [Citation(s) in RCA: 243] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
A cell adhesive peptide, Arg-Gly-Asp (RGD), was immobilized onto the surface of electrospun poly(D,L-lactic-co-glycolic acid) PLGA nanofiber mesh in an attempt to mimic an extracellular matrix structure. A blend mixture of PLGA and PLGA-b-PEG-NH(2) di-block copolymer dissolved in a 1:1 volume mixture of dimethylformamide and tetrahydrofuran was electrospun to produce a nanofiber mesh with functional primary amino groups on the surface. Various electrospinning parameters, such as polymer concentration and the blend ratio, were optimized to produce a nanofiber mesh with desirable morphology, surface characteristics, and fiber diameter. A cell adhesive peptide, GRGDY, was covalently grafted onto the aminated surface of the electrospun mesh under a hydrating condition. The amounts of surface primary amino groups and grafted RGD peptides were quantitatively determined. Cell attachment, spreading, and proliferation were greatly enhanced in the RGD modified electrospun PLGA nanofiber mesh compared with that of the unmodified one.
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Affiliation(s)
- Taek Gyoung Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, South Korea
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Chevallier P, Janvier R, Mantovani D, Laroche G. In vitro biological performances of phosphorylcholine-grafted ePTFE prostheses through RFGD plasma techniques. Macromol Biosci 2005; 5:829-39. [PMID: 16134089 DOI: 10.1002/mabi.200500088] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Arterial prostheses made of microporous Teflon (ePTFE) are currently used in vascular surgery as bypasses for small and medium vessels. However, several clinical complications, such as thrombosis, frequently occur in these prostheses when implanted in humans. In this work, an original strategy was developed to improve the hemocompatibility of ePTFE prostheses, based on glow-discharge surface modification followed by chemical grafting of phosphorylcholine, known for its hemocompatible properties. This procedure leads to a covalent attachment of the molecules, therefore preventing their removal by shear stress induced by blood flow at the implant wall. The improvement of the blood compatibility properties of the modified ePTFE arterial prostheses have been investigated by in vitro tests such as thromboelastography, neutrophil adsorption, platelet aggregation, and cell cultures. These in vitro tests put in evidence that thrombogenicity index, platelet aggregation, and neutrophil adhesion were decreased by the molecule grafted on the prostheses. Moreover, the cell growth on the surface of the PRC-grafted prostheses was greatly enhanced in comparison to the virgin prosthesis. Based on these results, it could be concluded that PRC grafting on ePTFE prostheses permit to improve in vitro hemocompatibility and biocompatibility in comparison with their virgin counterpart.
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Affiliation(s)
- Pascale Chevallier
- Unité de Biotechnologie et de Bioingénierie, Centre de Recherche de l'Hôpital Saint-François d'Assise, CHUQ, 10 rue de l'Espinay, Québec G1L 3L5, Canada
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Wentrup-Byrne E, Grøndahl L, Suzuki S. Methacryloxyethyl phosphate-grafted expanded polytetrafluoroethylene membranes for biomedical applications. POLYM INT 2005. [DOI: 10.1002/pi.1902] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Dong B, Manolache S, Somers EB, Lee Wong AC, Denes FS. Generation of antifouling layers on stainless steel surfaces by plasma-enhanced crosslinking of polyethylene glycol. J Appl Polym Sci 2005. [DOI: 10.1002/app.21766] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Gauvreau V, Chevallier P, Vallières K, Petitclerc E, Gaudreault RC, Laroche G. Engineering Surfaces for Bioconjugation: Developing Strategies and Quantifying the Extent of the Reactions. Bioconjug Chem 2004; 15:1146-56. [PMID: 15366971 DOI: 10.1021/bc049858u] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This study presents two-step and multistep reactions for modifying the surface of plasma-functionalized poly(tetrafluoroethylene) (PTFE) surfaces for subsequent conjugation of biologically relevant molecules. First, PTFE films were treated by a radiofrequency glow discharge (RFGD) ammonia plasma to introduce amino groups on the fluoropolymer surface. This plasma treatment is well optimized and allows the incorporation of a relative surface concentration of approximately 2-3.5% of amino groups, as assessed by chemical derivatization followed by X-ray photoelectron spectroscopy (XPS). In a second step, these amino groups were further reacted with various chemical reagents to provide the surface with chemical functionalities such as maleimides, carboxylic acids, acetals, aldehydes, and thiols, that could be used later on to conjugate a wide variety of biologically relevant molecules such as proteins, DNA, drugs, etc. In the present study, glutaric and cis-aconitic anhydrides were evaluated for their capability to provide carboxylic functions to the PTFE plasma-treated surface. Bromoacetaldehyde diethylacetal was reacted with the aminated PTFE surface, providing a diethylacetal function, which is a latent form of aldehyde functionality. Reactions with cross-linkers such as sulfo-succinimidyl derivatives (sulfo-SMCC, sulfo-SMPB) were evaluated to provide a highly reactive maleimide function suitable for further chemical reactions with thiolated molecules. Traut reagent (2-iminothiolane) was also conjugated to introduce a thiol group onto the fluoropolymer surface. PTFE-modified surfaces were analyzed by XPS with a particular attention to quantify the extent of the reactions that occurred on the polymer. Finally, surface immobilization of fibronectin performed using either glutaric anhydride or sulfo-SMPB activators demonstrated the importance of selecting the appropriate conjugation strategy to retain the protein biological activity.
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Affiliation(s)
- Virginie Gauvreau
- Unité de Biotechnologie et de Bioingénierie, Centre de Recherche de l'Hôpital Saint-François d'Assise, C.H.U.Q., 10 rue de l'Espinay, Québec, Québec, Canada, G1L 3L5
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Laredo J, Xue L, Husak VA, Ellinger J, Singh G, Zamora PO, Greisler HP. Silyl-heparin bonding improves the patency and in vivo thromboresistance of carbon-coated polytetrafluoroethylene vascular grafts. J Vasc Surg 2004; 39:1059-65. [PMID: 15111862 DOI: 10.1016/j.jvs.2003.12.025] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
OBJECTIVES Our purpose was to improve the performance of carbon-coated expanded polytetrafluoroethylene vascular grafts by bonding the grafts with silyl-heparin, a biologically active heparin analog, using polyethylene glycol as a cross-linking agent. Material and method Silyl-heparin-bonded carbon-coated expanded polytetrafluoroethylene vascular grafts (Bard Peripheral Vascular, Tempe, Ariz), were evaluated for patency and platelet deposition 2 hours, 7 days, and 30 days after graft implantation in a canine bilateral aortoiliac artery model. Platelet deposition was determined by injection of autologous, (111)Indium-radiolabeled platelets, followed by a 2-hour circulation period prior to graft explantation. Histologic studies were performed on a 2-mm longitudinal strip of each graft (7-day and 30-day groups). Heparin activity of the explanted silyl-heparin grafts was determined by using an antithrombin-III based thrombin binding assay. RESULTS Overall chronic graft patency (7-day and 30-day groups) was 100% for the silyl-heparin bonded (16/16) grafts versus 68.75% for control (11/16) grafts (P =.043). Acute 2-hour graft patency was 100% for the silyl-heparin bonded (6/6) grafts versus 83.3% for control (5/6) grafts. Radiolabeled platelet deposition studies revealed a significantly lower amount of platelets deposited on the silyl-heparin grafts as compared with control grafts in the 30-day group (13.8 +/- 7.18 vs 28.4 +/- 9.73, CPM per cm2 per million platelets, mean +/- SD, P =.0451, Wilcoxon rank sum test). In the 2-hour group of dogs, a trend towards a lower deposition of platelets on the silyl-heparin grafts was observed. There was no significant difference in platelet deposition between the two grafts in the 7-day group. Histologic studies revealed a significant reduction in intraluminal graft thrombus present on the silyl-heparin grafts as compared with control grafts in the 30-day group of animals. In contrast, there was no difference in amount of graft thrombus present on both graft types in the 7-day group of dogs. Pre-implant heparin activity on the silyl-heparin bonded grafts was 2.0 IU/cm(2) (international units[IU]/cm(2)). Heparin activity remained present on the silyl-heparin grafts after explantation at all 3 time points (2 hours: above upper limit of assay, upper limit = 0.57, n = 6; 7 days: 0.106 +/- 0.015, n = 5; 30 days: 0.007 +/- 0.001, n = 5; mean +/- SD, IU/cm(2)). CONCLUSION Silyl-heparin bonding onto carbon-coated expanded polytetrafluoroethylene vascular grafts resulted in (1) improved graft patency, (2) increased in vivo graft thromboresistance, and (3) a significant reduction in intraluminal graft thrombus. This graft may prove to be useful in the clinical setting.
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Affiliation(s)
- James Laredo
- Department of Surgery, Loyola University Medical Center, Hines, Ill, USA
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Chen Y, Liu P. Surface modification of polyethylene by plasma pretreatment and UV-induced graft polymerization for improvement of antithrombogenicity. J Appl Polym Sci 2004. [DOI: 10.1002/app.20663] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Albumin and fibrinogen adsorption onto phosphatidylcholine monolayers investigated by Fourier transform infrared spectroscopy. Colloids Surf B Biointerfaces 2003. [DOI: 10.1016/s0927-7765(03)00017-1] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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