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Guo Y, Guo H, He D, Sun J, Chen W, Song Y, Zhou G. Development of Cyclic Tetrasiloxane Polymer as a High-Performance Dielectric and Hydrophobic Layer for Electrowetting Displays. ACS APPLIED MATERIALS & INTERFACES 2023; 15:46470-46482. [PMID: 37738528 DOI: 10.1021/acsami.3c08188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/24/2023]
Abstract
Cyclic tetrasiloxane polymer (CTP) has recently garnered interest as a hydrophobic material with unique properties. This study aims to enhance the dielectric constant of CTP films by introducing excess Si-H groups and to explore the impact of synthesis and processing conditions on the resulting properties. The film demonstrates high hydrophobicity, with contact angles of 107° in air and 165° in n-decane, along with a notable dielectric constant of 5.1°. Furthermore, the CTP film displays reversible electrowetting behavior with low contact angle hysteresis (2°) and possesses good transparency (∼99%) and thermal stability. As such, the CTP film has significant potential as a material for the electric wetting of hydrophobic dielectric layers and may serve as a promising alternative in electrowetting applications.
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Affiliation(s)
- Yuanyuan Guo
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
- Shenzhen Guohua Optoelectronics Tech., Co., Ltd., Shenzhen 518110, China
- Academy of Shenzhen Guohua Optoelectronics, Shenzhen 518110, China
| | - Hao Guo
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Dinggui He
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Jiaqi Sun
- University of Chinese Academy of Sciences, Ningbo Institute of Materials Technology and Engineering, Ningbo 315201, China
| | - Wangqiao Chen
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Yujie Song
- University of Chinese Academy of Sciences, Ningbo Institute of Materials Technology and Engineering, Ningbo 315201, China
| | - Guofu Zhou
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
- Shenzhen Guohua Optoelectronics Tech., Co., Ltd., Shenzhen 518110, China
- Academy of Shenzhen Guohua Optoelectronics, Shenzhen 518110, China
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2
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Liamas E, Connell SD, Sarkar A. Frictional behaviour of plant proteins in soft contacts: unveiling nanoscale mechanisms. NANOSCALE ADVANCES 2023; 5:1102-1114. [PMID: 36798497 PMCID: PMC9926882 DOI: 10.1039/d2na00696k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 12/26/2022] [Indexed: 06/18/2023]
Abstract
Despite the significance of nanotribology in the design of functional biomaterials, little is known about nanoscale friction in the presence of protein-coated soft contact surfaces. Here, we report a detailed investigation of frictional behaviour of sustainable plant proteins at the nanoscale for the first time, using deformable bio-relevant surfaces that achieve biologically relevant contact pressures. A combination of atomic force microscopy, quartz crystal microbalance with dissipation monitoring, and friction force microscopy with soft polydimethylsiloxane (PDMS, 150 kPa) surfaces was employed to elucidate the frictional properties of model plant proteins, i.e. lupine, pea, and potato proteins at the nanoscale while systematically varying the pH and ionic strength. Interactions of these plant proteins with purified mucins were also probed. We provide the much-needed direct experimental evidence that the main factor dictating the frictional properties of plant proteins is their affinity towards the surface, followed by the degree of protein film hydration. Proteins with high surface affinity, such as pea and potato protein, have better lubricating performance than lupine at the nanoscale. Other minor factors that drive lubrication are surface interactions between sliding bodies, especially at low load, whilst jamming of the contact area caused by larger protein aggregates increases friction. Novel findings reveal that interactions between plant proteins and mucins lead to superior lubricating properties, by combining high surface affinity from the plant proteins and high hydration by mucins. We anticipate that fundamental understanding gained from this work will set the stage for the design of a plethora of sustainable biomaterials and food with optimum nanolubrication performance.
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Affiliation(s)
- Evangelos Liamas
- Food Colloids and Bioprocessing Group, School of Food Science and Nutrition, University of Leeds UK
| | - Simon D Connell
- Molecular and Nanoscale Physics Group, School of Physics and Astronomy, University of Leeds UK
| | - Anwesha Sarkar
- Food Colloids and Bioprocessing Group, School of Food Science and Nutrition, University of Leeds UK
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3
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Ajdnik U, Luxbacher T, Zemljič LF. Proteins at polysaccharide-based biointerfaces: A comparative study of QCM-D and electrokinetic measurements. Colloids Surf B Biointerfaces 2022; 221:113011. [DOI: 10.1016/j.colsurfb.2022.113011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 10/28/2022] [Accepted: 11/07/2022] [Indexed: 11/09/2022]
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4
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Lentz S, Trossmann VT, Borkner CB, Beyersdorfer V, Rottmar M, Scheibel T. Structure-Property Relationship Based on the Amino Acid Composition of Recombinant Spider Silk Proteins for Potential Biomedical Applications. ACS APPLIED MATERIALS & INTERFACES 2022; 14:31751-31766. [PMID: 35786828 DOI: 10.1021/acsami.2c09590] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Improving biomaterials by engineering application-specific and adjustable properties is of increasing interest. Most of the commonly available materials fulfill the mechanical and physical requirements of relevant biomedical applications, but they lack biological functionality, including biocompatibility and prevention of microbial infestation. Thus, research has focused on customizable, application-specific, and modifiable surface coatings to cope with the limitations of existing biomaterials. In the case of adjustable degradation and configurable interaction with body fluids and cells, these coatings enlarge the applicability of the underlying biomaterials. Silks are interesting coating materials, e.g., for implants, since they exhibit excellent biocompatibility and mechanical properties. Herein, we present putative implant coatings made of five engineered recombinant spider silk proteins derived from the European garden spider Araneus diadematus fibroins (ADF), differing in amino acid sequence and charge. We analyzed the influence of the underlying amino acid composition on wetting behavior, blood compatibility, biodegradability, serum protein adsorption, and cell adhesion. The outcome of the comparison indicates that spider silk coatings can be engineered for explicit biomedical applications.
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Affiliation(s)
- Sarah Lentz
- Lehrstuhl Biomaterialien, Fakultät für Ingenieurwissenschaften, Universität Bayreuth, Rüdiger-Bormann-Str. 1, 95447 Bayreuth, Germany
| | - Vanessa T Trossmann
- Lehrstuhl Biomaterialien, Fakultät für Ingenieurwissenschaften, Universität Bayreuth, Rüdiger-Bormann-Str. 1, 95447 Bayreuth, Germany
| | - Christian B Borkner
- Lehrstuhl Biomaterialien, Fakultät für Ingenieurwissenschaften, Universität Bayreuth, Rüdiger-Bormann-Str. 1, 95447 Bayreuth, Germany
| | - Vivien Beyersdorfer
- Lehrstuhl Biomaterialien, Fakultät für Ingenieurwissenschaften, Universität Bayreuth, Rüdiger-Bormann-Str. 1, 95447 Bayreuth, Germany
| | - Markus Rottmar
- Laboratory for Materials-Biology Interactions, Empa Swiss Federal Laboratories for Materials Science and Technology, CH-9014 St. Gallen, Switzerland
| | - Thomas Scheibel
- Lehrstuhl Biomaterialien, Fakultät für Ingenieurwissenschaften, Universität Bayreuth, Rüdiger-Bormann-Str. 1, 95447 Bayreuth, Germany
- Bayerisches Polymerinstitut (BPI), Bayreuther Zentrum für Kolloide und Grenzflächen (BZKG), Bayreuther Zentrum für Molekulare Biowissenschaften (BZMB), Bayreuther Materialzentrum (BayMAT), Universität Bayreuth, Universitätsstr. 30, 95440 Bayreuth, Germany
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5
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6
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Ajdnik U, Luxbacher T, Vesel A, Štern A, Žegura B, Trček J, Fras Zemljič L. Polysaccharide-Based Bilayer Coatings for Biofilm-Inhibiting Surfaces of Medical Devices. MATERIALS (BASEL, SWITZERLAND) 2021; 14:4720. [PMID: 34443242 PMCID: PMC8398363 DOI: 10.3390/ma14164720] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/03/2021] [Revised: 08/17/2021] [Accepted: 08/18/2021] [Indexed: 01/16/2023]
Abstract
Chitosan (Chi) and 77KS, a lysine-derived surfactant, form polyelectrolyte complexes that reverse their charge from positive to negative at higher 77KS concentrations, forming aggregates that have been embedded with amoxicillin (AMOX). Dispersion of this complex was used to coat polydimethylsiloxane (PDMS) films, with an additional layer of anionic and hydrophilic hyaluronic acid (HA) as an outer adsorbate layer to enhance protein repulsion in addition to antimicrobial activity by forming a highly hydrated layer in combination with steric hindrance. The formed polysaccharide-based bilayer on PDMS was analyzed by water contact angle measurements, X-ray photoelectron spectroscopy (XPS), and surface zeta (ζ)-potential. All measurements show the existence and adhesion of the two layers on the PDMS surface. Part of this study was devoted to understanding the underlying protein adsorption phenomena and identifying the mechanisms associated with biofouling. Thus, the adsorption of a mixed-protein solution (bovine serum albumin, fibrinogen, γ-globulin) on PDMS surfaces was studied to test the antifouling properties. The adsorption experiments were performed using a quartz crystal microbalance with dissipation monitoring (QCM-D) and showed improved antifouling properties by these polysaccharide-based bilayer coatings compared to a reference or for only one layer, i.e., the complex. This proves the benefit of a second hyaluronic acid layer. Microbiological and biocompatibility tests were also performed on real samples, i.e., silicone discs, showing the perspective of the prepared bilayer coating for medical devices such as prostheses, catheters (balloon angioplasty, intravascular), delivery systems (sheaths, implants), and stents.
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Affiliation(s)
- Urban Ajdnik
- Institute of Engineering Materials and Design, Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | | | - Alenka Vesel
- Department of Surface Engineering and Optoelectronics, Jožef Stefan Institute, Teslova 30, 1000 Ljubljana, Slovenia;
| | - Alja Štern
- Department of Genetic Toxicology and Cancer Biology, National Institute of Biology, Večna Pot 111, 1000 Ljubljana, Slovenia; (A.Š.); (B.Ž.)
| | - Bojana Žegura
- Department of Genetic Toxicology and Cancer Biology, National Institute of Biology, Večna Pot 111, 1000 Ljubljana, Slovenia; (A.Š.); (B.Ž.)
| | - Janja Trček
- Department of Biology, Faculty of Natural Sciences and Mathematics, University of Maribor, Koroška cesta 160, 2000 Maribor, Slovenia;
| | - Lidija Fras Zemljič
- Institute of Engineering Materials and Design, Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
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7
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Ajdnik U, Zemljič LF, Plohl O, Pérez L, Trček J, Bračič M, Mohan T. Bioactive Functional Nanolayers of Chitosan-Lysine Surfactant with Single- and Mixed-Protein-Repellent and Antibiofilm Properties for Medical Implants. ACS APPLIED MATERIALS & INTERFACES 2021; 13:23352-23368. [PMID: 33998809 PMCID: PMC8289181 DOI: 10.1021/acsami.1c01993] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 05/04/2021] [Indexed: 06/12/2023]
Abstract
Medical implant-associated infections resulting from biofilm formation triggered by unspecific protein adsorption are the prevailing cause of implant failure. However, implant surfaces rendered with multifunctional bioactive nanocoatings offer a promising alternative to prevent the initial attachment of bacteria and effectively interrupt biofilm formation. The need to research and develop novel and stable bioactive nanocoatings for medical implants and a comprehensive understanding of their properties in contact with the complex biological environment are crucial. In this study, we developed an aqueous stable and crosslinker-free polyelectrolyte-surfactant complex (PESC) composed of a renewable cationic polysaccharide, chitosan, a lysine-based anionic surfactant (77KS), and an amphoteric antibiotic, amoxicillin, which is widely used to treat a number of infections caused by bacteria. We successfully introduced the PESC as bioactive functional nanolayers on the "model" and "real" polydimethylsiloxane (PDMS) surfaces under dynamic and ambient conditions. Besides their high stability and improved wettability, these uniformly deposited nanolayers (thickness: 44-61 nm) with mixed charges exhibited strong repulsion toward three model blood proteins (serum albumin, fibrinogen, and γ-globulin) and their competitive interactions in the mixture in real-time, as demonstrated using a quartz crystal microbalance with dissipation (QCM-D). The functional nanolayers with a maximum negative zeta potential (ζ: -19 to -30 mV at pH 7.4), water content (1628-1810 ng cm-2), and hydration (low viscosity and elastic shear modulus) correlated with the mass, conformation, and interaction nature of proteins. In vitro antimicrobial activity testing under dynamic conditions showed that the charged nanolayers actively inhibited the growth of both Gram-negative (Escherichia coli) and Gram-positive (Staphylococcus aureus) bacteria compared to unmodified PDMS. Given the ease of fabrication of multifunctional and charged biobased coatings with simultaneous protein-repellent and antimicrobial activities, the limitations of individual approaches could be overcome leading to a better and advanced design of various medical devices (e.g., catheters, prosthetics, and stents).
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Affiliation(s)
- Urban Ajdnik
- Faculty
of Mechanical Engineering, Institute of Engineering Materials and
Design, Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Lidija Fras Zemljič
- Faculty
of Mechanical Engineering, Institute of Engineering Materials and
Design, Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Olivija Plohl
- Faculty
of Mechanical Engineering, Institute of Engineering Materials and
Design, Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Lourdes Pérez
- Department
of Surfactants and Nanobiotechnology, Institute
for Advanced Chemistry of Catalonia (IQAC-CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain
| | - Janja Trček
- Faculty
of Natural Sciences and Mathematics, Department of Biology, University of Maribor, Koroška cesta 160, 2000 Maribor, Slovenia
| | - Matej Bračič
- Faculty
of Mechanical Engineering, Institute of Engineering Materials and
Design, Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova ulica 17, 2000 Maribor, Slovenia
| | - Tamilselvan Mohan
- Institute
for Chemistry and Technology of Biobased Systems (IBioSys), Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
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8
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Li PP, Xue SM, Shareef U, Xu ZL, Ji CH. Thin-film liftoff assisted fabrication of amine-based PDMS TFC membrane for enhanced phenol recovery. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119104] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Anticoagulant Activity of Cellulose Nanocrystals from Isora Plant Fibers Assembled on Cellulose and SiO 2 Substrates via a Layer-by-Layer Approach. Polymers (Basel) 2021; 13:polym13060939. [PMID: 33803742 PMCID: PMC8003298 DOI: 10.3390/polym13060939] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 03/12/2021] [Accepted: 03/15/2021] [Indexed: 12/26/2022] Open
Abstract
In this study, we report the isolation of cellulose nanocrystals (CNCs) from Isora plant fibers by sulfuric acid hydrolysis and their assembly on hydrophilic cellulose and silicon-di-oxide (SiO2) surfaces via a layer-by-layer (LBL) deposition method. The isolated CNCs were monodispersed and exhibited a length of 200–300 nm and a diameter of 10–20 nm, a negative zetapotential (−34–39 mV) over a wide pH range, and high stability in water at various concentrations. The multi-layered structure, adsorbed mass, conformational changes, and anticoagulant activity of sequentially deposited anionic (sulfated) CNCs and cationic polyethyleneimine (PEI) on the surfaces of cellulose and SiO2 by LBL deposition were investigated using a quartz crystal microbalance technique. The organization and surface features (i.e., morphology, thickness, wettability) of CNCs adsorbed on the surfaces of PEI deposited at different ionic strengths (50–300 mM) of sodium chloride were analysed in detail by profilometry layer-thickness, atomic force microscopy and contact angle measurements. Compared to cellulose (control sample), the total coagulation time and plasma deposition were increased and decreased, respectively, for multilayers of PEI/CNCs. This study should provide new possibilities to fabricate and tailor the physicochemical properties of multilayer films from polysaccharide-based nanocrystals for various biomedical applications.
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10
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Liamas E, Connell SD, Zembyla M, Ettelaie R, Sarkar A. Friction between soft contacts at nanoscale on uncoated and protein-coated surfaces. NANOSCALE 2021; 13:2350-2367. [PMID: 33367416 DOI: 10.1039/d0nr06527g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The understanding of friction on soft sliding biological surfaces at the nanoscale is poorly understood as hard interfaces are frequently used as model systems. Herein, we studied the influence of elastic modulus on the frictional properties of model surfaces at the nanoscale for the first time. We prepared model silicone-based elastomer surfaces with tuneable modulus ranging from hundreds of kPa to a few MPa, similar to those found in real biological surfaces, and employed atomic force microscopy to characterize their modulus, adhesion, and surface morphology. Consequently, we used friction force microscopy to investigate nanoscale friction in hard-soft and soft-soft contacts using spherical colloidal probes covered by adsorbed protein films. Unprecedented results from this study reveal that modulus of a surface can have a significant impact on the frictional properties of protein-coated surfaces with higher deformability leading to lower contact pressure and, consequently, decreased friction. These important results pave the way forward for designing new functional surfaces for serving as models of appropriate deformability to replicate the mechanical properties of the biological structures and processes for accurate friction measurements at nanoscale.
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Affiliation(s)
- Evangelos Liamas
- Food Colloids and Bioprocessing Group, School of Food Science and Nutrition, University of Leeds, UK.
| | - Simon D Connell
- Molecular and Nanoscale Physics Group, School of Physics and Astronomy, University of Leeds, UK.
| | - Morfo Zembyla
- Food Colloids and Bioprocessing Group, School of Food Science and Nutrition, University of Leeds, UK.
| | - Rammile Ettelaie
- Food Colloids and Bioprocessing Group, School of Food Science and Nutrition, University of Leeds, UK.
| | - Anwesha Sarkar
- Food Colloids and Bioprocessing Group, School of Food Science and Nutrition, University of Leeds, UK.
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11
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Grain surface analysis of a hydrophobized sand: Thickness estimation of the soft coating layer. POWDER TECHNOL 2021. [DOI: 10.1016/j.powtec.2020.09.062] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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12
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Ajdnik U, Finšgar M, Fras Zemljič L. Characterization of chitosan-lysine surfactant bioactive coating on silicone substrate. Carbohydr Polym 2020; 232:115817. [PMID: 31952614 DOI: 10.1016/j.carbpol.2019.115817] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 12/23/2019] [Accepted: 12/30/2019] [Indexed: 12/22/2022]
Abstract
Chitosan (Chi) and anionic surfactant derived from lysine (77KS) were used to prepare a novel bioactive coating and as a drug delivery system for amoxicillin (AMOX) on a model polydimethylsiloxane (PDMS) surface. The bioactive coating was formulated as polyelectrolyte-surfactant complex (PESC). Aggregation behaviour between the cationic Chi and oppositely charged 77KS in bulk was analysed using turbidity and ζ-potential measurement. Furthermore, the adsorption and stability of the formulations were evaluated using quartz crystal microbalance with dissipation (QCM-D). The effect of the ionic strength and of the ultraviolet/ozone (UVO) activation of the PDMS films on the adsorption behaviour of the PESC complex was also examined. QCM-D monitoring showed stable adsorption of bare and AMOX-loaded complex on non-activated PDMS films, while the coating on UVO-activated PDMS samples desorbed after the rinsing step. Finally, X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry confirmed successful and homogenously distributed compounds.
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Affiliation(s)
- Urban Ajdnik
- University of Maribor, Faculty of Mechanical Engineering, Institute for Engineering Materials and Design, Smetanova ulica 17, 2000 Maribor, Slovenia.
| | - Matjaž Finšgar
- University of Maribor, Faculty of Chemistry and Chemical Engineering, Smetanova ulica 17, 2000 Maribor, Slovenia.
| | - Lidija Fras Zemljič
- University of Maribor, Faculty of Mechanical Engineering, Institute for Engineering Materials and Design, Smetanova ulica 17, 2000 Maribor, Slovenia.
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13
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Mohan T, Čas A, Bračič M, Plohl O, Vesel A, Rupnik M, Zemljič LF, Rebol J. Highly Protein Repellent and Antiadhesive Polysaccharide Biomaterial Coating for Urinary Catheter Applications. ACS Biomater Sci Eng 2019; 5:5825-5832. [DOI: 10.1021/acsbiomaterials.9b01288] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Tamilselvan Mohan
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, Maribor 2000, Slovenia
| | - Alja Čas
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, Maribor 2000, Slovenia
| | - Matej Bračič
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, Maribor 2000, Slovenia
| | - Olivija Plohl
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, Maribor 2000, Slovenia
| | - Alenka Vesel
- Department of Surface Engineering and Optoelectronics, Jožef Stefan Institute, Teslova 30, Ljubljana SI-1000, Slovenia
| | - Maja Rupnik
- Faculty of Medicine, University of Maribor, Taborska ulica 8, Maribor 2000, Slovenia
- National Laboratory for Health, Environment and Food, Prvomajska ulica 1, Maribor 2000, Slovenia
| | - Lidija Fras Zemljič
- Laboratory for Characterization and Processing of Polymers (LCPP), Faculty of Mechanical Engineering, University of Maribor, Smetanova ulica 17, Maribor 2000, Slovenia
| | - Janez Rebol
- Department of Otorhinolaryngology, Cervical and Maxillofacial Surgery, University Medical Centre Maribor, Ljubljanska ulica 5, Maribor 2000, Slovenia
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14
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Raghuwanshi VS, Garnier G. Cellulose Nano-Films as Bio-Interfaces. Front Chem 2019; 7:535. [PMID: 31417896 PMCID: PMC6682661 DOI: 10.3389/fchem.2019.00535] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2019] [Accepted: 07/12/2019] [Indexed: 12/12/2022] Open
Abstract
Cellulose, the most abundant polymer on earth, has enormous potential in developing bio-friendly, and sustainable technological products. In particular, cellulose films of nanoscale thickness (1-100 nm) are transparent, smooth (roughness <1 nm), and provide a large surface area interface for biomolecules immobilization and interactions. These attractive film properties create many possibilities for both fundamental studies and applications, especially in the biomedical field. The three liable-OH groups on the monomeric unit of the cellulose chain provide schemes to chemically modify the cellulose interface and engineer its properties. Here, the cellulose thin film serves as a substrate for biomolecules interactions and acts as a support for bio-diagnostics. This review focuses on the challenges and opportunities provided by engineering cellulose thin films for controlling biomolecules interactions. The first part reviews the methods for preparing cellulose thin films. These are by dispersing or dissolving pure cellulose or cellulose derivatives in a solvent to coat a substrate using the spin coating, Langmuir-Blodgett, or Langmuir-Schaefer method. It is shown how different cellulose sources, preparation, and coating methods and substrate surface pre-treatment affect the film thickness, roughness, morphology, crystallinity, swelling in water, and homogeneity. The second part analyses the bio-macromolecules interactions with the cellulose thin film interfaces. Biomolecules, such as antibodies and enzymes, are adsorbed at the cellulose-liquid interface, and analyzed dry and wet. This highlights the effect of film surface morphology, thickness, crystallinity, water intake capacity, and surface pre-treatment on biomolecule adsorption, conformation, coverage, longevity, and activity. Advance characterization of cellulose thin film interface morphology and adsorbed biomolecules interactions are next reviewed. X-ray and neutron scattering/reflectivity combined with atomic force microscopy (AFM), quartz crystal microbalance (QCM), microscopy, and ellipsometer allow visualizing, and quantifying the structural morphology of cellulose-biomolecule interphase and the respective biomolecules conformations, kinetics, and sorption mechanisms. This review provides a novel insight on the advantages and challenges of engineering cellulose thin films for biomedical applications. This is to foster the exploration at the molecular level of the interaction mechanisms between a cellulose interface and adsorbed biomolecules with respect to adsorbed molecules morphology, surface coverage, and quantity. This knowledge is to engineer a novel generation of efficient and functional biomedical devices.
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Affiliation(s)
- Vikram Singh Raghuwanshi
- Bioresource Processing Research Institute of Australia (BioPRIA), Monash University, Clayton, VIC, Australia
| | - Gil Garnier
- Bioresource Processing Research Institute of Australia (BioPRIA), Monash University, Clayton, VIC, Australia
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15
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Kim W, Oh J, Kwon S, Kim K, Kim SJ. Quantifying the pH shift induced by selective anodic electrochemical reactions in the ion concentration polarization phenomenon. LAB ON A CHIP 2019; 19:1359-1369. [PMID: 30869092 DOI: 10.1039/c8lc01363b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Recently, the ion concentration polarization (ICP) phenomenon has been actively utilized for low abundance biomolecular preconcentration applications. Since ICP significantly rearranges the ion distribution near a permselective membrane, its detailed investigation should be conducted for developing efficient platforms. In particular, proton transport through the membrane critically affects the pH of sample solutions so that continuous monitoring or batch measurement of pH is the priority task to be carried out. Moreover, electrochemical reactions have been overlooked, even though an overpotential is applied to preconcentrate a sample under physiological conditions, and the electrodes are in direct contact with the sample biomolecules. In this work, we experimentally visualized and directly measured how the electrochemical reaction dominated the preconcentration efficiency using two types of electrode configurations; large exposed electrode area (LEEA) and small exposed electrode area (SEEA). Interestingly, significant pH variation was confirmed only in the case of SEEA. As a result, the BSA preconcentration was impeded within a short period in the case of SEEA, but loss-free preconcentration was achieved in the case of LEEA. Therefore, one should pay careful attention to the electrode design of electrokinetic operation, especially when pH-sensitive biomolecules are involved.
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Affiliation(s)
- Wonseok Kim
- Department of Electrical and Computer Engineering, Seoul National University, Seoul 08826, Republic of Korea.
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16
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De Vera JS, Venault A, Chou YN, Tayo L, Chiang HC, Aimar P, Chang Y. Self-Cleaning Interfaces of Polydimethylsiloxane Grafted with pH-Responsive Zwitterionic Copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:1357-1368. [PMID: 30089354 DOI: 10.1021/acs.langmuir.8b01569] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Self-cleaning surfaces allow the reversible attachment and detachment of microorganisms which show great promise in regards to their reusability as smart biomaterials. However, a widely used biomaterial such as polydimethylsiloxane (PDMS) suffers from high biofouling activity and hydrophobic recovery that results in decreased efficiency and stability. A current challenge is to modify and fabricate self-cleaning PDMS surfaces by incorporating antifouling and pH-sensitive properties. To address this, we synthesized a zwitterionic and pH-sensitive random poly(glycidyl methacrylate- co-sulfobetaine methacrylate- co-2-(dimethylamino)ethyl methacrylate) polymer, poly(GMA- co-SBMA- co-DMAEMA). In this work, chemical modification of PDMS was done by grafting onto poly(GMA- co-SBMA- co-DMAEMA) after surface activation via UV and ozone for 90 min to ensure the formation of covalent bonds necessary for stable grafting. The PDMS grafted with G20-S40-D40 exhibit antifouling and pH-sensitive properties by mitigating fibrinogen adsorption, blood cell adhesion, and releasing 98% adhered E. coli bacteria after immersion at basic pH. The grafting of poly(GMA- co-SBMA- co-DMAEMA) presented in this work shows attractive potential for biomedical and industrial applications as a simple, smart, and effective method for the modification of PDMS interfaces.
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Affiliation(s)
- Jacqueline S De Vera
- R&D Center for Membrane Technology and Department of Chemical Engineering , Chung Yuan Christian University , Chung-Li , Taoyuan 320 , Taiwan
- School of Chemical, Biological and Materials Engineering and Sciences , Mapua University , Intramuros, Muralla St. , Manila 1002 , Philippines
| | - Antoine Venault
- R&D Center for Membrane Technology and Department of Chemical Engineering , Chung Yuan Christian University , Chung-Li , Taoyuan 320 , Taiwan
| | - Ying-Nien Chou
- R&D Center for Membrane Technology and Department of Chemical Engineering , Chung Yuan Christian University , Chung-Li , Taoyuan 320 , Taiwan
| | - Lemmuel Tayo
- School of Chemical, Biological and Materials Engineering and Sciences , Mapua University , Intramuros, Muralla St. , Manila 1002 , Philippines
| | - Heng-Chieh Chiang
- Division of Urology, Department of Surgery , Changhua Christian Hospital , 135 Nanxian St. , Changhua 500 , Taiwan
| | - Pierre Aimar
- Laboratoire de Génie Chimique , Université Paul Sabatier , 118 route de Narbonne , 31062 Toulouse Cedex 9, France
| | - Yung Chang
- R&D Center for Membrane Technology and Department of Chemical Engineering , Chung Yuan Christian University , Chung-Li , Taoyuan 320 , Taiwan
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17
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Movilli J, Rozzi A, Ricciardi R, Corradini R, Huskens J. Control of Probe Density at DNA Biosensor Surfaces Using Poly(l-lysine) with Appended Reactive Groups. Bioconjug Chem 2018; 29:4110-4118. [PMID: 30412384 PMCID: PMC6302315 DOI: 10.1021/acs.bioconjchem.8b00733] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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Biosensors and materials
for biomedical applications generally
require chemical functionalization to bestow their surfaces with desired
properties, such as specific molecular recognition and antifouling
properties. The use of modified poly(l-lysine) (PLL) polymers
with appended oligo(ethylene glycol) (OEG) and thiol-reactive maleimide
(Mal) moieties (PLL-OEG-Mal) offers control over the presentation
of functional groups. These reactive groups can readily be conjugated
to, for example, probes for DNA detection. Here we demonstrate the
reliable conjugation of thiol-functionalized peptide nucleic acid
(PNA) probes onto predeposited layers of PLL-OEG-Mal and the control
over their surface density in the preceding synthetic step of the
PLL modification with Mal groups. By monitoring the quartz crystal
microbalance (QCM) frequency shifts of the binding of complementary
DNA versus the density of Mal moieties grafted to the PLL, a linear
relationship between probe density and PLL grafting density was found.
Cyclic voltammetry experiments using Methylene Blue-functionalized
DNA were performed to establish the absolute probe density values
at the biosensor surfaces. These data provided a density of 1.2 ×
1012 probes per cm2 per % of grafted Mal, thus
confirming the validity of the density control in the synthetic PLL
modification step without the need of further surface characterization.
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Affiliation(s)
- Jacopo Movilli
- Molecular NanoFabrication group, MESA+ Institute for Nanotechnology, Department of Science and Technology , University of Twente , P.O. Box 217, 7500 AE , Enschede , The Netherlands
| | - Andrea Rozzi
- Department of Chemistry, Life Sciences and Environmental Sustainability , University of Parma , Parco Area delle Scienze 17/A , 43124 Parma , Italy
| | - Roberto Ricciardi
- Molecular NanoFabrication group, MESA+ Institute for Nanotechnology, Department of Science and Technology , University of Twente , P.O. Box 217, 7500 AE , Enschede , The Netherlands
| | - Roberto Corradini
- Department of Chemistry, Life Sciences and Environmental Sustainability , University of Parma , Parco Area delle Scienze 17/A , 43124 Parma , Italy
| | - Jurriaan Huskens
- Molecular NanoFabrication group, MESA+ Institute for Nanotechnology, Department of Science and Technology , University of Twente , P.O. Box 217, 7500 AE , Enschede , The Netherlands
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18
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Borah D, Cummins C, Rasappa S, Senthamaraikannan R, Salaun M, Zelsmann M, Liontos G, Ntetsikas K, Avgeropoulos A, Morris MA. Nanopatterning via Self-Assembly of a Lamellar-Forming Polystyrene-block-Poly(dimethylsiloxane) Diblock Copolymer on Topographical Substrates Fabricated by Nanoimprint Lithography. NANOMATERIALS (BASEL, SWITZERLAND) 2018; 8:E32. [PMID: 29315245 PMCID: PMC5791119 DOI: 10.3390/nano8010032] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 12/28/2017] [Accepted: 01/02/2018] [Indexed: 01/17/2023]
Abstract
The self-assembly of a lamellar-forming polystyrene-block-poly(dimethylsiloxane) (PS-b-PDMS) diblock copolymer (DBCP) was studied herein for surface nanopatterning. The DBCP was synthesized by sequential living anionic polymerization of styrene and hexamethylcyclotrisiloxane (D₃). The number average molecular weight (Mn), polydispersity index (Mw/Mn) and PS volume fraction (φps) of the DBCP were MnPS = 23.0 kg mol-1, MnPDMS = 15.0 kg mol-1, Mw/Mn = 1.06 and φps = 0.6. Thin films of the DBCP were cast and solvent annealed on topographically patterned polyhedral oligomeric silsesquioxane (POSS) substrates. The lamellae repeat distance or pitch (λL) and the width of the PDMS features (dL) are ~35 nm and ~17 nm, respectively, as determined by SEM. The chemistry of the POSS substrates was tuned, and the effects on the self-assembly of the DBCP noted. The PDMS nanopatterns were used as etching mask in order to transfer the DBCP pattern to underlying silicon substrate by a complex plasma etch process yielding sub-15 nm silicon features.
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Affiliation(s)
- Dipu Borah
- AMBER Centre & CRANN, Trinity College Dublin, College Green, Dublin, Ireland.
| | - Cian Cummins
- AMBER Centre & CRANN, Trinity College Dublin, College Green, Dublin, Ireland.
| | - Sozaraj Rasappa
- AMBER Centre & CRANN, Trinity College Dublin, College Green, Dublin, Ireland.
| | | | - Mathieu Salaun
- Laboratoire des Technologies de la Microelectronique (CNRS), 38054 Grenoble, France.
| | - Marc Zelsmann
- Laboratoire des Technologies de la Microelectronique (CNRS), 38054 Grenoble, France.
| | - George Liontos
- Department of Materials Science Engineering, University of Ioannina, University Campus-Dourouti, 45110 Ioannina, Greece.
| | - Konstantinos Ntetsikas
- Department of Materials Science Engineering, University of Ioannina, University Campus-Dourouti, 45110 Ioannina, Greece.
| | - Apostolos Avgeropoulos
- Department of Materials Science Engineering, University of Ioannina, University Campus-Dourouti, 45110 Ioannina, Greece.
| | - Michael A Morris
- AMBER Centre & CRANN, Trinity College Dublin, College Green, Dublin, Ireland.
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19
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Zahouani S, Hurman L, De Giorgi M, Vigier-Carrière C, Boulmedais F, Senger B, Frisch B, Schaaf P, Lavalle P, Jierry L. Step-by-step build-up of covalent poly(ethylene oxide) nanogel films. NANOSCALE 2017; 9:18379-18391. [PMID: 29147710 DOI: 10.1039/c7nr05424f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Hydrogels based on poly(ethylene glycol) (PEG) are commonly used for studies related to cell fate and tissue engineering. Here we present a new covalent layer-by-layer build-up process leading to PEG coatings of nanometer size called "nanogel films". Compared to macroscopic hydrogels, such nanogels should provide a fine control over the structure and the thickness of the coating. Alternated deposition of bifunctional and tetra functional PEG molecules reacting through thiol/maleimide click chemistry is evaluated by quartz crystal microbalance. We first study parameters influencing the build-up process of such coatings and demonstrate the importance of (i) the nature of the first deposited layer, (ii) the PEG concentrations and (iii) the length of the PEG chains that appears to be the most significant parameter influencing film growth. The build-up process can be extended to a large variety of substrates like SiO2 or polymers by using an appropriate anchoring layer. Covalent functionalization of these nanogel films by proteins or enzymes is suited by modifying the biomolecules with thiol or maleimide groups and immobilizing them during the build-up process. Activity of the embedded enzymes can be maintained. Moreover ligands like biotin can be incorporated into the film and recognition by streptavidin can be modulated by playing with the number of PEG layers covering biotin. Compared to well-known PEG hydrogels, these new coatings are promising as they allow to (i) build thin nanometric coatings, (ii) finely control the amount of deposited PEG and (iii) organize the position of the embedded biomolecules inside the film layers.
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Affiliation(s)
- S Zahouani
- Institut National de la Santé et de la Recherche Médicale, INSERM Unité 1121, 11 rue Humann, 67085 Strasbourg Cedex, France.
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20
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Stana J, Stergar J, Gradišnik L, Flis V, Kargl R, Fröhlich E, Stana Kleinschek K, Mohan T, Maver U. Multilayered Polysaccharide Nanofilms for Controlled Delivery of Pentoxifylline and Possible Treatment of Chronic Venous Ulceration. Biomacromolecules 2017; 18:2732-2746. [DOI: 10.1021/acs.biomac.7b00523] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Jan Stana
- Schön Klinik Vogtareuth, Department of Vascular
and Endovascular Surgery, Krankenhausstraße 20, 83569 Vogtareuth, Germany
| | - Janja Stergar
- University of Maribor, Faculty of Medicine, Institute
of Biomedical Sciences, Taborska ulica 8, SI-2000 Maribor, Slovenia
| | - Lidija Gradišnik
- University of Maribor, Faculty of Medicine, Institute
of Biomedical Sciences, Taborska ulica 8, SI-2000 Maribor, Slovenia
| | - Vojko Flis
- University Medical Centre Maribor, Division of Surgery,
Department of Vascular Surgery, Ljubljanka ulica 5, SI-2000 Maribor, Slovenia
| | - Rupert Kargl
- University of Maribor, Faculty of Mechanical Engineering,
Laboratory for Characterisation and Processing of Polymers, Smetanova 17, SI-2000 Maribor, Slovenia
| | - Eleonore Fröhlich
- Medical University of Graz, Center for Medical Research,
Core Facility Microscopy, Stiftingtalstraße 24, 8010 Graz, Austria
| | - Karin Stana Kleinschek
- University of Maribor, Faculty of Mechanical Engineering,
Laboratory for Characterisation and Processing of Polymers, Smetanova 17, SI-2000 Maribor, Slovenia
| | - Tamilselvan Mohan
- University of Graz, Institute of Chemistry, Heinrichstrasse 28, 8010 Graz, Austria
| | - Uroš Maver
- University of Maribor, Faculty of Medicine, Institute
of Biomedical Sciences, Taborska ulica 8, SI-2000 Maribor, Slovenia
- University of Maribor, Faculty of Medicine, Department
of Pharmacology, Taborska
ulica 8, SI-2000 Maribor, Slovenia
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21
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Bračič M, Fras-Zemljič L, Pérez L, Kogej K, Stana-Kleinschek K, Kargl R, Mohan T. Protein-repellent and antimicrobial nanoparticle coatings from hyaluronic acid and a lysine-derived biocompatible surfactant. J Mater Chem B 2017; 5:3888-3897. [PMID: 32264250 DOI: 10.1039/c7tb00311k] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Biofilm formation triggered by uncontrolled protein adsorption, on medical devices is the leading cause of catheter-associated urinary tract infections (CAUTI) during implantation. Herein, we report a water-based, green and one-step strategy to functionalize surfaces of silicone catheters, poly(dimethylsiloxane) (PDMS), with antifouling and antimicrobial substances to avoid uncontrolled protein adsorption and microbial attachment. A novel synergetic formulation consisting of an anionic glycosaminoglycan (hyaluronic acid, HA) and a lysine-derived biocompatible cationic surfactant (Nε-myristoyl-lysine methyl ester, MKM) was prepared, resulting in the formation of nanoparticles (NPs, ca. 100-250 nm). Besides their high stability and long-lasting hydrophilicity in ambient and aqueous environments for 60 days, the nanometric layers (48 ± 3 nm) of HA-MKM NPs on PDMS showed no adsorption of BSA and lysozyme and substantially lower adsorption of fibrinogen as revealed by a quartz crystal microbalance with dissipation (QCM-D). In vitro antimicrobial test with S. aureus, E. coli, P. aeruginosa, P. mirabilis, C. albicans microbes under dynamic conditions revealed that the microbial growth was hampered by 85% compared with unmodified PDMS. Given the multiple functionalities, charges and diverse physiochemical properties of polysaccharide-lysine-based surfactant mixtures, this approach can be easily extended to the development of novel coatings on other silicone-based materials, thereby broadening potential applicability of PDMS-based biomaterials/devices in microfluidics, diagnostic biosensors and others.
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Affiliation(s)
- M Bračič
- Laboratory for Characterization and Processing of Polymers, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
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22
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Hill S, Qian W, Chen W, Fu J. Surface micromachining of polydimethylsiloxane for microfluidics applications. BIOMICROFLUIDICS 2016; 10:054114. [PMID: 27795746 PMCID: PMC5065565 DOI: 10.1063/1.4964717] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Accepted: 09/29/2016] [Indexed: 06/06/2023]
Abstract
Polydimethylsiloxane (PDMS) elastomer has emerged as one of the most frequently applied materials in microfluidics. However, precise and large-scale surface micromachining of PDMS remains challenging, limiting applications of PDMS for microfluidic structures with high-resolution features. Herein, surface patterning of PDMS was achieved using a simple yet effective method combining direct photolithography followed by reactive-ion etching (RIE). This method incorporated a unique step of using oxygen plasma to activate PDMS surfaces to a hydrophilic state, thereby enabling improved adhesion of photoresist on top of PDMS surfaces for subsequent photolithography. RIE was applied to transfer patterns from photoresist to underlying PDMS thin films. Systematic experiments were conducted in the present work to characterize PDMS etch rate and etch selectivity of PDMS to photoresist as a function of various RIE parameters, including pressure, RF power, and gas flow rate and composition. We further compared two common RIE systems with and without bias power and employed inductively coupled plasma and capacitively coupled plasma sources, respectively, in terms of their PDMS etching performances. The RIE-based PDMS surface micromachining technique is compatible with conventional Si-based surface and bulk micromachining techniques, thus opening promising opportunities for generating hybrid microfluidic devices with novel functionalities.
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Affiliation(s)
| | - Weiyi Qian
- Department of Mechanical and Aerospace Engineering, New York University , Brooklyn, New York 11201, USA
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23
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Xia D, Guo Q, Ge M, Yuan Y, Xu M, Yao J. On-line sensitive detection of aromatic vapor through PDMS/C3H7S-assisted SERS amplification. RSC Adv 2016. [DOI: 10.1039/c6ra10525d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A PDMS/C3H7S-assisted SERS amplification method was developed for on-line detection of aromatic vapor. This approach provides a rapid, efficient route to significantly improve the capture and immobilization of vapor molecules on the plasmonic surface in the flowing system.
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Affiliation(s)
- Di Xia
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- China
| | - Qinghua Guo
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- China
| | - Ming Ge
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- China
| | - Yaxian Yuan
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- China
| | - Minmin Xu
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- China
| | - Jianlin Yao
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- China
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24
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Amornkitbamrung L, Mohan T, Hribernik S, Reichel V, Faivre D, Gregorova A, Engel P, Kargl R, Ribitsch V. Polysaccharide stabilized nanoparticles for deacidification and strengthening of paper. RSC Adv 2015. [DOI: 10.1039/c4ra15153d] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
This paper reports an investigation on the use of a highly stable colloidal organic dispersion consisting of a polysaccharides and alkaline nanoparticles for the simultaneous deacidification and strengthening of historical wood pulp papers.
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Affiliation(s)
| | | | - Silvo Hribernik
- Faculty of Mechanical Engineering
- Institute for Engineering Materials and Design
- University of Maribor
- 2000 Maribor
- Slovenia
| | - Victoria Reichel
- Department of Biomaterials
- Max Planck Institute of Colloids and Interfaces
- Potsdam
- Germany
| | - Damien Faivre
- Department of Biomaterials
- Max Planck Institute of Colloids and Interfaces
- Potsdam
- Germany
| | - Adriana Gregorova
- Institute for Chemistry and Technology of Materials
- Graz University of Technology
- AT 8010 Graz
- Austria
| | - Patricia Engel
- European Research Centre for Book and Paper Conservation-Restoration
- Donau-Universität Krems
- 3500 Krems
- Austria
| | - Rupert Kargl
- Faculty of Mechanical Engineering
- Institute for Engineering Materials and Design
- University of Maribor
- 2000 Maribor
- Slovenia
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25
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Chen D, Hu X, Zhang H, Yin X, Zhou Y. Preparation and properties of novel polydimethylsiloxane composites using polyvinylsilsesquioxanes as reinforcing agent. Polym Degrad Stab 2015. [DOI: 10.1016/j.polymdegradstab.2014.10.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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26
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Qian C, Guo Q, Xu M, Yuan Y, Yao J. Improving the SERS detection sensitivity of aromatic molecules by a PDMS-coated Au nanoparticle monolayer film. RSC Adv 2015. [DOI: 10.1039/c5ra07324c] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this paper, we reported a facile strategy to fabricate a PDMS film-coated Au nanoparticle monolayer film (Au MLF) composite substrate for improving SERS detection of aromatic molecules in water and in the atmosphere.
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Affiliation(s)
- Chen Qian
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- China
| | - Qinghua Guo
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- China
| | - Minmin Xu
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- China
| | - Yaxian Yuan
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- China
| | - Jianlin Yao
- College of Chemistry
- Chemical Engineering and Materials Science
- Soochow University
- Suzhou
- China
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27
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Photoregeneration of trimethylsilyl cellulose as a tool for microstructuring ultrathin cellulose supports. Molecules 2014; 19:16266-73. [PMID: 25310151 PMCID: PMC6271022 DOI: 10.3390/molecules191016266] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Revised: 09/22/2014] [Accepted: 09/28/2014] [Indexed: 11/17/2022] Open
Abstract
Microstructured thin films based on cellulose, the most abundant biopolymer on Earth, have been obtained by UV-irradiation of acid-labile trimethylsilyl cellulose thin films in the presence of N-hydroxynaphtalimide triflate as photoacid generator. We demonstrate that this photoregeneration process can be exploited for the manufacture of cellulose patterns having feature sizes down to 1 μm, with potential applications in life sciences.
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28
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Meng Y, Chu J, Xue J, Liu C, Wang Z, Zhang L. Design and synthesis of non-crystallizable, low-Tg polysiloxane elastomers with functional epoxy groups through anionic copolymerization and subsequent epoxidation. RSC Adv 2014. [DOI: 10.1039/c4ra02293a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of novel non-crystallizable, low-Tg epoxidized polysiloxane elastomers with excellent low-temperature performance and high degradation temperature were synthesized.
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Affiliation(s)
- Yang Meng
- State Key Laboratory of Organic–Inorganic Composites
- Beijing University of Chemical Technology
- , P. R. China
- Key Laboratory of Beijing City for Preparation and Processing of Novel Polymer Materials
- Beijing University of Chemical Technology
| | - Junfeng Chu
- State Key Laboratory of Organic–Inorganic Composites
- Beijing University of Chemical Technology
- , P. R. China
- Key Laboratory of Beijing City for Preparation and Processing of Novel Polymer Materials
- Beijing University of Chemical Technology
| | - Jiajia Xue
- State Key Laboratory of Organic–Inorganic Composites
- Beijing University of Chemical Technology
- , P. R. China
- Key Laboratory of Beijing City for Preparation and Processing of Novel Polymer Materials
- Beijing University of Chemical Technology
| | - Chaohao Liu
- State Key Laboratory of Organic–Inorganic Composites
- Beijing University of Chemical Technology
- , P. R. China
- Key Laboratory of Beijing City for Preparation and Processing of Novel Polymer Materials
- Beijing University of Chemical Technology
| | - Zhen Wang
- AVIC Beijing Institute of Aeronautical Materials
- , P. R. China
| | - Liqun Zhang
- State Key Laboratory of Organic–Inorganic Composites
- Beijing University of Chemical Technology
- , P. R. China
- Key Laboratory of Beijing City for Preparation and Processing of Novel Polymer Materials
- Beijing University of Chemical Technology
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