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Dardouri M, Bettencourt A, Martin V, Carvalho FA, Colaço B, Gama A, Ramstedt M, Santos NC, Fernandes MH, Gomes PS, Ribeiro IAC. Assuring the Biofunctionalization of Silicone Covalently Bonded to Rhamnolipids: Antibiofilm Activity and Biocompatibility. Pharmaceutics 2022; 14:pharmaceutics14091836. [PMID: 36145584 PMCID: PMC9501004 DOI: 10.3390/pharmaceutics14091836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/10/2022] [Accepted: 08/25/2022] [Indexed: 12/05/2022] Open
Abstract
Silicone-based medical devices composed of polydimethylsiloxane (PDMS) are widely used all over the human body (e.g., urinary stents and catheters, central venous catheters stents) with extreme clinical success. Nevertheless, their abiotic surfaces, being prone to microorganism colonization, are often involved in infection occurrence. Improving PDMS antimicrobial properties by surface functionalization with biosurfactants to prevent related infections has been the goal of different works, but studies that mimic the clinical use of these novel surfaces are missing. This work aims at the biofunctional assessment of PDMS functionalized with rhamnolipids (RLs), using translational tests that more closely mimic the clinical microenvironment. Rhamnolipids were covalently bonded to PDMS, and the obtained surfaces were characterized by contact angle modification assessment, ATR-FTIR analysis and atomic force microscopy imaging. Moreover, a parallel flow chamber was used to assess the Staphylococcus aureus antibiofilm activity of the obtained surfaces under dynamic conditions, and an in vitro characterization with human dermal fibroblast cells in both direct and indirect characterization assays, along with an in vivo subcutaneous implantation assay in the translational rabbit model, was performed. A 1.2 log reduction in S. aureus biofilm was observed after 24 h under flow dynamic conditions. Additionally, functionalized PDMS lessened cell adhesion upon direct contact, while supporting a cytocompatible profile, within an indirect assay. The adequacy of the biological response was further validated upon in vivo subcutaneous tissue implantation. An important step was taken towards biofunctional assessment of RLs-functionalized PDMS, reinforcing their suitability for medical device usage and infection prevention.
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Affiliation(s)
- Maïssa Dardouri
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Avenida Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - Ana Bettencourt
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Avenida Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - Victor Martin
- BoneLab—Laboratory for Bone Metabolism and Regeneration, Faculty of Dental Medicine, University of Porto, Rua Dr. Manuel Pereira da Silva, 4200-393 Porto, Portugal
- LAQV/REQUIMTE, University of Porto, Praça Coronel Pacheco, 4050-453 Porto, Portugal
| | - Filomena A. Carvalho
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Bruno Colaço
- Animal and Veterinary Research Centre (CECAV), Associate Laboratory for Animal and Veterinary Science–AL4AnimalS, University of Trás-os-Montes and Alto Douro (UTAD), 5000-801 Vila Real, Portugal
| | - Adelina Gama
- Animal and Veterinary Research Centre (CECAV), Associate Laboratory for Animal and Veterinary Science–AL4AnimalS, University of Trás-os-Montes and Alto Douro (UTAD), 5000-801 Vila Real, Portugal
| | | | - Nuno C. Santos
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Av. Prof. Egas Moniz, 1649-028 Lisbon, Portugal
| | - Maria H. Fernandes
- BoneLab—Laboratory for Bone Metabolism and Regeneration, Faculty of Dental Medicine, University of Porto, Rua Dr. Manuel Pereira da Silva, 4200-393 Porto, Portugal
- LAQV/REQUIMTE, University of Porto, Praça Coronel Pacheco, 4050-453 Porto, Portugal
| | - Pedro S. Gomes
- BoneLab—Laboratory for Bone Metabolism and Regeneration, Faculty of Dental Medicine, University of Porto, Rua Dr. Manuel Pereira da Silva, 4200-393 Porto, Portugal
- LAQV/REQUIMTE, University of Porto, Praça Coronel Pacheco, 4050-453 Porto, Portugal
- Correspondence: (P.S.G.); (I.A.C.R.); Tel.: +351-220-910-100 (P.S.G.); +351-217-946-400 (I.A.C.R.); Fax: +351-220-910-101 (P.S.G.); +351-217-946-470 (I.A.C.R.)
| | - Isabel A. C. Ribeiro
- Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Avenida Prof. Gama Pinto, 1649-003 Lisboa, Portugal
- Correspondence: (P.S.G.); (I.A.C.R.); Tel.: +351-220-910-100 (P.S.G.); +351-217-946-400 (I.A.C.R.); Fax: +351-220-910-101 (P.S.G.); +351-217-946-470 (I.A.C.R.)
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Faryami A, Menkara A, Viar D, Harris CA. Testing and validation of reciprocating positive displacement pump for benchtop pulsating flow model of cerebrospinal fluid production and other physiologic systems. PLoS One 2022; 17:e0262372. [PMID: 35550626 PMCID: PMC9098063 DOI: 10.1371/journal.pone.0262372] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Accepted: 04/15/2022] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND The flow of physiologic fluids through organs and organs systems is an integral component of their function. The complex fluid dynamics in many organ systems are still not completely understood, and in-vivo measurements of flow rates and pressure provide a testament to the complexity of each flow system. Variability in in-vivo measurements and the lack of control over flow characteristics leave a lot to be desired for testing and evaluation of current modes of treatments as well as future innovations. In-vitro models are particularly ideal for studying neurological conditions such as hydrocephalus due to their complex pathophysiology and interactions with therapeutic measures. The following aims to present the reciprocating positive displacement pump, capable of inducing pulsating flow of a defined volume at a controlled beat rate and amplitude. While the other fluidic applications of the pump are currently under investigation, this study was focused on simulating the pulsating cerebrospinal fluid production across profiles with varying parameters. METHODS Pumps were manufactured using 3D printed and injection molded parts. The pumps were powered by an Arduino-based board and proprietary software that controls the linear motion of the pumps to achieve the specified output rate at the desired pulsation rate and amplitude. A range of 0.01 [Formula: see text] to 0.7 [Formula: see text] was tested to evaluate the versatility of the pumps. The accuracy and precision of the pumps' output were evaluated by obtaining a total of 150 one-minute weight measurements of degassed deionized water per output rate across 15 pump channels. In addition, nine experiments were performed to evaluate the pumps' control over pulsation rate and amplitude. RESULTS Volumetric analysis of a total of 1200 readings determined that the pumps achieved the target output volume rate with a mean absolute error of -0.001034283 [Formula: see text] across the specified domain. It was also determined that the pumps can maintain pulsatile flow at a user-specified beat rate and amplitude. CONCLUSION The validation of this reciprocating positive displacement pump system allows for the future validation of novel designs to components used to treat hydrocephalus and other physiologic models involving pulsatile flow. Based on the promising results of these experiments at simulating pulsatile CSF flow, a benchtop model of human CSF production and distribution could be achieved through the incorporation of a chamber system and a compliance component.
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Affiliation(s)
- Ahmad Faryami
- Department of Biomedical Engineering, Wayne State University, Detroit, MI, United States of America
| | - Adam Menkara
- Department of Biomedical Engineering, Wayne State University, Detroit, MI, United States of America
| | - Daniel Viar
- Department of Computer Science and Engineering, University of Toledo, Toledo, Ohio, United States of America
| | - Carolyn A. Harris
- Wayne State University Dept. of Chemical Engineering and Materials Science, Detroit, MI, United States of America
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Zaranek M, Arshad R, Zheng K, Harris CA. Response of Astrocytes to Blood Exposure due to Shunt Insertion in vitro. AIChE J 2021; 67. [PMID: 35497642 DOI: 10.1002/aic.17485] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The breakdown of the ventricular zone (VZ) with the presence of blood in cerebrospinal fluid (CSF) has been shown to increase shunt catheter obstruction in the treatment of hydrocephalus, but the mechanisms by which this occurs are generally unknown. Using a custom-built incubation chamber, we immunofluorescently assayed cell attachment and morphology on shunt catheters with and without blood after 14 days. Samples exposed to blood showed significantly increased cell attachment (average total cell count 392.0±317.1 versus control of 94.7±44.5, P<0.0001). Analysis of the glial fibrillary acidic protein (GFAP) expression showed similar trends (854.4±450.7 versus control of 174.3±116.5, P<0.0001). An in vitro model was developed to represent the exposure of astrocytes to blood following an increase in BBB permeability. Exposure of astrocytes to blood increases the number of cells and their spread on the shunt.
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Affiliation(s)
- Mira Zaranek
- Wayne State University Dept. of Chemical Engineering and Materials Science, 6135 Woodward Avenue, Detroit, MI 48202
| | - Rooshan Arshad
- Wayne State University Dept. of Chemical Engineering and Materials Science, 6135 Woodward Avenue, Detroit, MI 48202
| | - Kevin Zheng
- Wayne State University Dept. of Chemical Engineering and Materials Science, 6135 Woodward Avenue, Detroit, MI 48202
| | - Carolyn A Harris
- Wayne State University Dept. of Chemical Engineering and Materials Science, 6135 Woodward Avenue, Detroit, MI 48202
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Al-Saloum S, Zaranek M, Horbatiuk J, Gopalakrishnan P, Dumitrescu A, McAllister JP, Harris CA. Analysis of N-acetyl cysteine modified polydimethylsiloxane shunt for improved treatment of hydrocephalus. J Biomed Mater Res B Appl Biomater 2020; 109:1177-1187. [PMID: 33331125 DOI: 10.1002/jbm.b.34780] [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: 08/13/2020] [Revised: 11/17/2020] [Accepted: 12/02/2020] [Indexed: 11/06/2022]
Abstract
A major cause of hydrocephalus shunt failure is cell adhesion and obstruction of shunt catheter holes. An estimated 50% of pediatric shunts fail in the first 2 years of insertion, decreasing cell attachment and catheter obstruction can prolong the lifetime and effectiveness of the device. From previous studies, it was shown that treatment of the polydimethylsiloxane (PDMS) surface of a standard catheter with an N-acetyl-cysteine (NAC/1-ethyl-3-(3-dimethylanimopropyl)carbodiimide hydrochloride/N-hydroxysuccinimide) layer increases the wettability of the surface and has been shown to decrease cell adhesion. Other studies indicate that NAC's antioxidant behavior induces glutathione and in turn modulates cell inflammatory pathways. The current study explores the longevity of the NAC coating from the surface of the catheter over time and shows its effect on valve function. Using SEM imaging, contact angle testing, and nanodrop spectrophotometry, this release was quantified for shunt samples incubated for 0, 10, 30, 60, and 90 days. Contact angle showed a significant increase in wettability of the surface when shunts were treated with NAC, confirming successful surface modification. Pressure assays determined that if the coating is release it had no detrimental downstream effects, such as on the shunt valve mechanism. SEM imaging revealed slight deformations in surface coating indicative of salt deposition on the modified shunt samples, while nanodrop spectrophotometry and contact angle data trends suggested some discharge of the NAC coating from the catheter surfaces. The effects of NAC on cell activity may transform the way hydrocephalus is treated in the future by increasing the longevity of the shunt to protect from obstruction.
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Affiliation(s)
- Saja Al-Saloum
- Wayne State University Department of Chemical Engineering and Materials Science, Detroit, Michigan, USA
| | - Mira Zaranek
- Wayne State University Department of Chemical Engineering and Materials Science, Detroit, Michigan, USA
| | - Jeff Horbatiuk
- Wayne State University Department of Chemical Engineering and Materials Science, Detroit, Michigan, USA
| | - Pranav Gopalakrishnan
- Wayne State University Department of Chemical Engineering and Materials Science, Detroit, Michigan, USA
| | - Andrea Dumitrescu
- Wayne State University Department of Chemical Engineering and Materials Science, Detroit, Michigan, USA
| | | | - Carolyn A Harris
- Wayne State University Department of Chemical Engineering and Materials Science, Detroit, Michigan, USA
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Tan CME, Dizon GV, Chen SH, Venault A, Chou YN, Tayo L, Chang Y. Temperature-triggered attachment and detachment of general human bio-foulants on zwitterionic polydimethylsiloxane. J Mater Chem B 2020; 8:8853-8863. [PMID: 33026392 DOI: 10.1039/d0tb01478h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Biofouling has long been a problem for biomaterials, so being able to control the fouling on the surface of a biomaterial would be ideal. In this study a copolymer system was designed comprising three moieties: an epoxy containing group, glycidyl methacrylate (GMA); a thermoresponsive segment, N-isopropylacrylamide (NIPAAm); and an antifouling zwitterionic unit, sulfobetaine methacrylate (SBMA). The copolymers (pGSN), synthesized via free radical polymerization with these 3 moieties, were then grafted onto polydimethylsiloxane (PDMS). The presence of a critical temperature for both the copolymers and the coated PDMS was evidenced by particle size and contact angle measurements. The coated PDMS exhibited controllable temperature-dependent antifouling behaviors and stimuli-responsive phase characteristics in the presence of salts. The interactions of the coated PDMS with biomolecules were tested via attachment of fibrinogen protein, platelets, human whole blood, and tumor cells (HT1080). The attachment and detachment of these biomolecules were studied at different temperatures. Exposed hydrophobic domains of thermoresponsive NIPAAm-rich pGSN containing NIPAAm at 56 mol% generally allows molecular and cellular attachment on the PDMS surface at 37 °C. On the other hand, the coated PDMS with a relatively high content of SBMA (>41 mol%) in the copolymer started to exhibit fouling resistance and lower the thermoresponsive properties. Interestingly, the incorporation of zwitterionic SBMA units into the copolymers was found to accelerate the hydration of the PDMS surfaces and resulted in biomolecular and cellular detachment at 25 °C, which is comparable to the detachment at 4 °C. This modified surface behavior is found to be consistent through all biofouling tests.
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Affiliation(s)
- Christian Martin E Tan
- School of Chemical, Biological and Materials Engineering and Sciences, Mapúa University, Intramuros, Manila, 1002, Philippines
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Ozbolat V, Dey M, Ayan B, Povilianskas A, Demirel MC, Ozbolat IT. 3D Printing of PDMS Improves Its Mechanical and Cell Adhesion Properties. ACS Biomater Sci Eng 2018; 4:682-693. [PMID: 33418756 DOI: 10.1021/acsbiomaterials.7b00646] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Despite extensive use of polydimethylsiloxane (PDMS) in medical applications, such as lab-on-a-chip or tissue/organ-on-a-chip devices, point-of-care devices, and biological machines, the manufacturing of PDMS devices is limited to soft-lithography and its derivatives, which prohibits the fabrication of geometrically complex shapes. With the recent advances in three-dimensional (3D) printing, use of PDMS for fabrication of such complex shapes has gained considerable interest. This research presents a detailed investigation on printability of PDMS elastomers over three concentrations for mechanical and cell adhesion studies. The results demonstrate that 3D printing of PDMS improved the mechanical properties of fabricated samples up to three fold compared to that of cast ones because of the decreased porosity of bubble entrapment. Most importantly, 3D printing facilitates the adhesion of breast cancer cells, whereas cast samples do not allow cellular adhesion without the use of additional coatings such as extracellular matrix proteins. Cells are able to adhere and grow in the grooves along the printed filaments demonstrating that 3D printed devices can be engineered with superior cell adhesion qualities compared to traditionally manufactured PDMS devices.
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Affiliation(s)
- Veli Ozbolat
- Mechanical Engineering Department, Ceyhan Engineering Faculty, Cukurova University, Adana 01950, Turkey
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Yu L, Tian Y, Gao A, Shi Z, Liu Y, Li C. Bi-module sensing device to in situ quantitatively detect hydrogen peroxide released from migrating tumor cells. PLoS One 2015; 10:e0127610. [PMID: 26035641 PMCID: PMC4452705 DOI: 10.1371/journal.pone.0127610] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 04/17/2015] [Indexed: 01/02/2023] Open
Abstract
Cell migration is one of the key cell functions in physiological and pathological processes, especially in tumor metastasis. However, it is not feasible to monitor the important biochemical molecules produced during cell migrations in situ by conventional cell migration assays. Herein, for the first time a device containing both electrochemical sensing and trans-well cell migration modules was fabricated to sensitively quantify biochemical molecules released from the cell migration process in situ. The fully assembled device with a multi-wall carbon nanotube/graphene/MnO2 nanocomposite functionalized electrode was able to successfully characterize hydrogen peroxide (H2O2) production from melanoma A375 cells, larynx carcinoma HEp-2 cells and liver cancer Hep G2 under serum established chemotaxis. The maximum concentration of H2O2 produced from A375, HEp-2 and Hep G2 in chemotaxis was 130±1.3 nM, 70±0.7 nM and 63±0.7 nM, respectively. While the time required reaching the summit of H2O2 production was 3.0, 4.0 and 1.5 h for A375, HEp-2 and Hep G2, respectively. By staining the polycarbonate micropore membrane disassembled from the device, we found that the average migration rate of the A375, HEp-2 and Hep G2 cells were 98±6%, 38±4% and 32 ±3%, respectively. The novel bi-module cell migration platform enables in situ investigation of cell secretion and cell function simultaneously, highlighting its potential for characterizing cell motility through monitoring H2O2 production on rare samples and for identifying underlying mechanisms of cell migration.
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Affiliation(s)
- Ling Yu
- Institute for Clean energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, Chongqing 400715, China
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Chongqing 400715, China
- Chongqing Engineering Research Center for Rapid diagnosis of Fatal Diseases, Chongqing 400715, China
- * E-mail: (LY); (YSL)
| | - YunLi Tian
- Institute for Clean energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, Chongqing 400715, China
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Chongqing 400715, China
- Chongqing Engineering Research Center for Rapid diagnosis of Fatal Diseases, Chongqing 400715, China
| | - AnXiu Gao
- Institute for Clean energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, Chongqing 400715, China
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Chongqing 400715, China
- Chongqing Engineering Research Center for Rapid diagnosis of Fatal Diseases, Chongqing 400715, China
| | - ZhuanZhuan Shi
- Institute for Clean energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, Chongqing 400715, China
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Chongqing 400715, China
- Chongqing Engineering Research Center for Rapid diagnosis of Fatal Diseases, Chongqing 400715, China
| | - YingShuai Liu
- Institute for Clean energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, Chongqing 400715, China
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Chongqing 400715, China
- Chongqing Engineering Research Center for Rapid diagnosis of Fatal Diseases, Chongqing 400715, China
- * E-mail: (LY); (YSL)
| | - ChangMing Li
- Institute for Clean energy & Advanced Materials, Faculty of Materials & Energy, Southwest University, Chongqing 400715, China
- Chongqing Key Laboratory for Advanced Materials and Technologies of Clean Energies, Chongqing 400715, China
- Chongqing Engineering Research Center for Rapid diagnosis of Fatal Diseases, Chongqing 400715, China
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Suresh S, Black RA. Electrospun polyurethane as an alternative ventricular catheter and in vitro model of shunt obstruction. J Biomater Appl 2014; 29:1028-38. [PMID: 25245779 PMCID: PMC4361491 DOI: 10.1177/0885328214551587] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Intracranial pressure and volume vary considerably between hydrocephalic patients, and with age, health and haemodynamic status; if left untreated, intracranial pressure rises and the ventricular system expands to accommodate the excess cerebrospinal fluid, with significant morbidity and mortality. Cerebrospinal fluid shunts in use today have a high incidence of failure with shunt obstruction being the most serious. Conventional proximal shunt catheters are made from poly(dimethyl)siloxane, the walls of which are perforated with holes for the cerebrospinal fluid to pass through. The limited range of catheters, in terms of material selection and flow distribution, is responsible in large part for their poor performance. In this study, we present an alternative design of proximal catheter made of electrospun polyether urethane, and evaluate its performance in the presence of glial cells, which are responsible for shunt blockage. The viability and growth of cells on catheter materials such as poly(dimethyl)siloxane and polyurethane in the form of cast films, microfibrous mats and porous sponges were studied in the presence of proteins present in cerebrospinal fluid after 48 h and 96 h in culture. The numbers of viable cells on each substrate were comparable to untreated poly(dimethyl)siloxane, both in the presence and absence of serum proteins found in cerebrospinal fluid. A cell culture model of shunt obstruction was developed in which cells on electrospun polyether urethane catheters were subjected to flow during culture in vitro, and the degree of obstruction quantified in terms of hydraulic permeability after static and perfusion culture. The results indicate that a catheter made of electrospun polyether urethane would be able to maintain cerebrospinal fluid flow even with the presence of cells for the time period chosen for this study. These findings have implications for the design and deployment of microporous shunt catheter systems for the treatment of hydrocephalus.
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Affiliation(s)
- Supraja Suresh
- Department of Biomedical Engineering, University of Strathclyde, Glasgow, UK
| | - Richard A Black
- Department of Biomedical Engineering, University of Strathclyde, Glasgow, UK
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Uehara H, Saitoh M, Morita R, Akiyama E, Yamanobe T. In Situ NMR Measurement of Novel Silicone Elastomer Obtained by Cross-Linking of Silicones Having Phenylene Backbone and Hyperbranched Molecular Architectures. Macromolecules 2014. [DOI: 10.1021/ma402291e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Hiroki Uehara
- Division
of Molecular Science, Faculty of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Masazumi Saitoh
- Division
of Molecular Science, Faculty of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Ryosuke Morita
- Division
of Molecular Science, Faculty of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
| | - Eiichi Akiyama
- Sagami Chemical Research Institute, 2743-1 Hayakawa, Ayase, Kanagawa 252-1193, Japan
| | - Takeshi Yamanobe
- Division
of Molecular Science, Faculty of Science and Technology, Gunma University, Kiryu, Gunma 376-8515, Japan
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Ghasemi M, Minier MJG, Tatoulian M, Chehimi MM, Arefi-Khonsari F. Ammonia Plasma Treated Polyethylene Films for Adsorption or Covalent Immobilization of Trypsin: Quantitative Correlation between X-ray Photoelectron Spectroscopy Data and Enzyme Activity. J Phys Chem B 2011; 115:10228-38. [DOI: 10.1021/jp204097a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Mahsa Ghasemi
- Chimie ParisTech, Laboratoire de Génie des Procédés Plasma et Traitements de Surface (LGPPTS), EA 3492, 75005 Paris, France
- UPMC Univ Paris 06, 75005 Paris, France
- Chimie ParisTech, Laboratoire Charles Friedel (LCF), 75005 Paris, France
- CNRS, UMR 7223, 75005 Paris, France
| | - Michel J. G. Minier
- Chimie ParisTech, Laboratoire Charles Friedel (LCF), 75005 Paris, France
- CNRS, UMR 7223, 75005 Paris, France
| | - Michaël Tatoulian
- Chimie ParisTech, Laboratoire de Génie des Procédés Plasma et Traitements de Surface (LGPPTS), EA 3492, 75005 Paris, France
- UPMC Univ Paris 06, 75005 Paris, France
| | - Mohamed M. Chehimi
- Interfaces, Traitements, Organisation & Dynamique des Systèmes (ITODYS Lab), University Paris Diderot & CNRS, 15 rue Jean-Antoine de Baïf, 75013 Paris, France
| | - Farzaneh Arefi-Khonsari
- Chimie ParisTech, Laboratoire de Génie des Procédés Plasma et Traitements de Surface (LGPPTS), EA 3492, 75005 Paris, France
- UPMC Univ Paris 06, 75005 Paris, France
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