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Zhang C, Qi Y, Guo Y, Zhang S, Xiong G, Wang K, Zhang Z. Anti-marine biofouling adhesion performance and mechanism of PDMS fouling-release coating containing PS-PEG hydrogel. MARINE POLLUTION BULLETIN 2023; 194:115345. [PMID: 37531797 DOI: 10.1016/j.marpolbul.2023.115345] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 07/20/2023] [Accepted: 07/23/2023] [Indexed: 08/04/2023]
Abstract
Polystyrene microspheres compounded with polyethylene glycol-based hydrogel (PS-PEG)/polydimethylsiloxane (PDMS) coatings were prepared using the physical blending method. The chemical structure, surface and interface properties, interlayer adhesion, and tensile properties were tested in this paper. Furthermore, the antifouling performance was evaluated through bovine serum albumin fluorescent protein adsorption testing, marine bacteria adhesion testing, and benthic diatom adhesion testing. The results showed that the coating performance was best when 20 wt% PS-PEG hydrogel was added. Its surface energy was only 19.21 mJ/m2, the maximum breaking strength was 1.24 MPa, the maximum elongation rate was 675 %, the elastic modulus was 2.53 MPa, and the anti-stripping rate was 100 %. In addition, the coating with added 20 wt% PS-PEG hydrogel bacterial adherence rate was 5.36 % and 2.45 % after rinsing and washing, respectively, and the removal rate was 54.29 %. In the benthic diatom adhesion test, the chlorophyll concentration a-value was only 0.0017 mg/L after washing with added 20 wt% hydrogel, and the protein desorption rate was 84.19 % higher than PDMS in the fluorescent protein adsorption test. This coating has the 'low adhesion' and 'desorption' characteristics in the three growth stages of biofouling. Meanwhile, the low surface energy of the silicone is stable, and the hydrogel also dynamically migrates to the surface to gradually form a hydration layer, both are synergistic. When 20 wt% PS-PEG hydrogel was added, the coating demonstrated excellent antifouling performance due to its high hydration layer, low surface energy, high elasticity, and high interlayer adhesion. This research is expected to contribute to the practical applications of hydrogel coatings in marine antifouling.
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Affiliation(s)
- Chen Zhang
- Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Yuhong Qi
- Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Yarui Guo
- Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Shukun Zhang
- Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Gang Xiong
- Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Kaixuan Wang
- Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China.
| | - Zhanping Zhang
- Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China.
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Pontremoli C, Pagani M, Maddalena L, Carosio F, Vitale-Brovarone C, Fiorilli S. Polyelectrolyte-Coated Mesoporous Bioactive Glasses via Layer-by-Layer Deposition for Sustained Co-Delivery of Therapeutic Ions and Drugs. Pharmaceutics 2021; 13:1952. [PMID: 34834366 PMCID: PMC8625996 DOI: 10.3390/pharmaceutics13111952] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 11/09/2021] [Accepted: 11/15/2021] [Indexed: 11/30/2022] Open
Abstract
In the field of bone regeneration, considerable attention has been addressed towards the use of mesoporous bioactive glasses (MBGs), as multifunctional therapeutic platforms for advanced medical devices. In fact, their extremely high exposed surface area and pore volume allow to load and the release of several drugs, while their framework can be enriched with specific therapeutic ions allowing to boost the tissue regeneration. However, due to the open and easily accessible mesopore structure of MBG, the release of the incorporated therapeutic molecules shows an initial burst effect leading to unsuitable release kinetics. Hence, a still open challenge in the design of drug delivery systems based on MBGs is the control of their release behavior. In this work, Layer-by-layer (LbL) deposition of polyelectrolyte multi-layers was exploited as a powerful and versatile technique for coating the surface of Cu-substituted MBG nanoparticles with innovative multifunctional drug delivery systems for co-releasing of therapeutic copper ions (exerting pro-angiogenic and anti-bacterial effects) and an anti-inflammatory drug (ibuprofen). Two different routes were investigated: in the first strategy, chitosan and alginate were assembled by forming the multi-layered surface, and, successively, ibuprofen was loaded by incipient wetness impregnation, while in the second approach, alginate was replaced by ibuprofen, introduced as polyelectrolyte layer. Zeta-potential, TGA and FT-IR spectroscopy were measured after the addition of each polyelectrolyte layer, confirming the occurrence of the stepwise deposition. In addition, the in vitro bioactivity and the ability to modulate the release of the cargo were evaluated. The polyelectrolyte coated-MBGs were proved to retain the peculiar ability to induce hydroxyapatite formation after 7 days of soaking in Simulated Body Fluid. Both copper ions and ibuprofen were co-released over time, showing a sustained release profile up to 14 days and 24 h, respectively, with a significantly lower burst release compared to the bare MBG particles.
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Affiliation(s)
- Carlotta Pontremoli
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy; (C.P.); (M.P.); (C.V.-B.)
- Department of Chemistry, NIS Interdepartmental and INSTM Reference Centre, University of Torino, via Giuria 7, 10125 Torino, Italy
| | - Mattia Pagani
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy; (C.P.); (M.P.); (C.V.-B.)
| | - Lorenza Maddalena
- Department of Applied Science and Technology, Politecnico di Torino, Alessandria Campus, Viale Teresa Michel 5, 15121 Alessandria, Italy; (L.M.); (F.C.)
| | - Federico Carosio
- Department of Applied Science and Technology, Politecnico di Torino, Alessandria Campus, Viale Teresa Michel 5, 15121 Alessandria, Italy; (L.M.); (F.C.)
| | - Chiara Vitale-Brovarone
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy; (C.P.); (M.P.); (C.V.-B.)
| | - Sonia Fiorilli
- Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy; (C.P.); (M.P.); (C.V.-B.)
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The Anchorage of Bone Cells onto an Yttria-Stabilized Zirconia Surface with Mild Nano-Micro Curved Profiles. Dent J (Basel) 2020; 8:dj8040127. [PMID: 33182602 PMCID: PMC7712018 DOI: 10.3390/dj8040127] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 11/04/2020] [Accepted: 11/06/2020] [Indexed: 01/16/2023] Open
Abstract
The high biocompatibility, good mechanical properties, and perfect esthetics of ceramic dental materials motivate investigation into their suitability as an endosseous implant. Osseointegration at the interface between bone and implant surface, which is a criterion for dental implant success, is dependent on surface chemistry and topography. We found out earlier that osteoblasts on sharp-edged micro-topographies revealed an impaired cell phenotype and function and the cells attempted to phagocytize these spiky elevations in vitro. Therefore, micro-structured implants used in dental surgery should avoid any spiky topography on their surface. The sandblasted, acid-etched, and heat-treated yttria-stabilized zirconia (cer.face®14) surface was characterized by scanning electron microscopy and energy dispersive X-ray. In vitro studies with human MG-63 osteoblasts focused on cell attachment and intracellular stress level. The cer.face 14 surface featured a landscape with nano-micro hills that was most sinusoidal-shaped. The mildly curved profile proved to be a suitable material for cell anchorage. MG-63 cells on cer.face 14 showed a very low reactive oxygen species (ROS) generation similar to that on the extracellular matrix protein collagen I (Col). Intracellular adenosine triphosphate (ATP) levels were comparable to Col. Ceramic cer.face 14, with its sinusoidal-shaped surface structure, facilitates cell anchorage and prevents cell stress.
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Ziminska M, Chalanqui MJ, Chambers P, Acheson JG, McCarthy HO, Dunne NJ, Hamilton AR. Nanocomposite-coated porous templates for engineered bone scaffolds: a parametric study of layer-by-layer assembly conditions. Biomed Mater 2019; 14:065008. [DOI: 10.1088/1748-605x/ab3b7b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Esmaeilzadeh P, Groth T. Switchable and Obedient Interfacial Properties That Grant New Biomedical Applications. ACS APPLIED MATERIALS & INTERFACES 2019; 11:25637-25653. [PMID: 31283160 DOI: 10.1021/acsami.9b06253] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Toward imitating the natural smartness and responsivity of biological systems, surface interfacial properties are considered to be responsive and tunable if they show a reactive behavior to an environmental stimulus. This is still quite different from many contemporary biomaterials that lack responsiveness to interact with blood and different body tissues in a physiological manner. Meanwhile it is possible to even go one step further from responsiveness to dual-mode switchability and explore "switchable" or "reversible" responses of synthetic materials. We understand "switchable biomaterials" as materials undergoing a stepwise, structural transformation coupled with considerable changes of interfacial and other surface properties as a response to a stimulus. Therewith, a survey on stimuli-induced dynamic changes of charge, wettability, stiffness, topography, porosity, and thickness/swelling is presented here, as potentially powerful new technologies especially for future biomaterial development. Since living cells constantly sense their environment through a variety of surface receptors and other mechanisms, these obedient interfacial properties were particularly discussed regarding their advantageous multifunctionality for protein adsorption and cell adhesion signaling, which may alter in time and with environmental conditions.
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Affiliation(s)
- Pegah Esmaeilzadeh
- Biomedical Materials Group, Institute of Pharmacy , Martin Luther University Halle-Wittenberg , Heinrich Damerow Strasse 4 , 06120 Halle (Saale), Germany
- Interdisciplinary Center of Material Science , Martin Luther University Halle-Wittenberg , Heinrich Damerow Strasse 4 , 06120 Halle (Saale), Germany
| | - Thomas Groth
- Biomedical Materials Group, Institute of Pharmacy , Martin Luther University Halle-Wittenberg , Heinrich Damerow Strasse 4 , 06120 Halle (Saale), Germany
- Interdisciplinary Center of Material Science , Martin Luther University Halle-Wittenberg , Heinrich Damerow Strasse 4 , 06120 Halle (Saale), Germany
- Interdisciplinary Center of Applied Sciences , Martin Luther University Halle-Wittenberg , 06099 Halle (Saale), Germany
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Niepel MS, Mano JF, Groth T. Effect of Polyelectrolyte Multilayers Assembled on Ordered Nanostructures on Adhesion of Human Fibroblasts. ACS APPLIED MATERIALS & INTERFACES 2016; 8:25142-51. [PMID: 27603547 DOI: 10.1021/acsami.6b09349] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Nanosphere lithography (NSL) and the layer-by-layer (LbL) technique are combined here for the first time to design a flexible system to achieve nanotopographical control of cell adhesion. NSL is used to generate regular patterns of tetrahedral gold nanodots of different size and distance. Besides the change in topography, LbL is used to generate a polyelectrolyte multilayer (PEM) system consisting of heparin (HEP) and poly(ethylene imine) (PEI) on top of the gold dots. The localized formation of PEM on gold dots is achieved by prior passivation of the surrounding silicon or glass surface. Properties of PEM are changed by adjusting the pH value of HEP solution to either acidic or alkaline values. Studies with human dermal fibroblasts (HDF) reveal that cells spread to a higher extent on PEM formed at pH 5.0 in dependence on the structure dimension. Further, filopodia formation is highly increased in cells on nanostructures exhibiting HEP as a terminal layer. The new system offers a great potential to guide stem cell differentiation in the future owing to its high degree of chemical and topographical heterogeneity.
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Affiliation(s)
| | - João F Mano
- Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro , 3810-193 Aveiro, Portugal
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Bhattacharjee P, Naskar D, Kim HW, Maiti TK, Bhattacharya D, Kundu SC. Non-mulberry silk fibroin grafted PCL nanofibrous scaffold: Promising ECM for bone tissue engineering. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.08.025] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Wang HG, Yin TY, Ge SP, Zhang Q, Dong QL, Lei DX, Sun DM, Wang GX. Biofunctionalization of titanium surface with multilayer films modified by heparin-VEGF-fibronectin complex to improve endothelial cell proliferation and blood compatibility. J Biomed Mater Res A 2012; 101:413-20. [DOI: 10.1002/jbm.a.34339] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2011] [Revised: 04/09/2012] [Accepted: 06/15/2012] [Indexed: 02/06/2023]
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9
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Kirchhof K, Andar A, Yin HB, Gadegaard N, Riehle MO, Groth T. Polyelectrolyte multilayers generated in a microfluidic device with pH gradients direct adhesion and movement of cells. LAB ON A CHIP 2011; 11:3326-3335. [PMID: 21853167 DOI: 10.1039/c1lc20408d] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this study, multilayers from polyethylene imine, heparin and chitosan are prepared at three different pH values of 5, 7 and 9. Water contact angle and quartz microbalance measurements show that resulting multilayers differ in terms of wetting behaviour, layer mass and mechanical properties. The multilayer is then formed within a gradient generation microfluidic (μFL) device. Polyethylene imine or heparin solutions of pH 5 are introduced into one inlet and the same solutions but at pH 9 into another inlet of the μFL device. The pH gradient established during the multilayer formation can be visualized inside the microchamber by pH sensitive fluorophores and confocal laser scanning microscopy. From this setup it is expected that properties of multilayers displayed at distinct pH values can be realised in a gradient manner inside the μFL device. Behaviour of the osteoblast cell line MG-63 seeded and cultured on top of multilayers created inside the μFL device support this hypothesis. It is observed that more cells adhere and spread on multilayers build-up at the basic side of the μFL channel, while those cells on top of multilayers built at pH 5 are fewer and smaller. These results are consistent with the behaviour of MG-63 cells seeded on multilayers formed at discrete pH values. It is particularly interesting to see that cells start to migrate from multilayers built at pH 5 to those built at pH 9 during 6 h of culture. Overall, the presented multilayer formation setup applying pH gradients leads to surfaces that promote migration of cells.
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Affiliation(s)
- K Kirchhof
- Biomedical Materials Group, Institute of Pharmacy, Center for Nanotechnology, Martin Luther University Halle-Wittenberg, Heinrich-Damerow-Strasse 4, 06120, Halle (Saale), Germany
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Chen QZ, Thouas GA. Fabrication and characterization of sol-gel derived 45S5 Bioglass®-ceramic scaffolds. Acta Biomater 2011; 7:3616-26. [PMID: 21689791 DOI: 10.1016/j.actbio.2011.06.005] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Revised: 06/02/2011] [Accepted: 06/05/2011] [Indexed: 10/18/2022]
Abstract
Although Bioglass® has existed for nearly half a century its ability to trigger bone formation and tuneable degradability is vastly superior to other bioceramics, such as SiO(2)-CaO bioactive glasses. The sol-gel process of producing glass foams is well established for SiO(2)-CaO compositions, but not yet established for 45S5 composites containing Na(2)O. In this work the sol-gel derived 45S5 Bioglass® has for the first time been foamed into highly porous three-dimensional scaffolds using a surfactant, combined with vigorous mechanical stirring and subsequent sintering at 1000°C for 2 h. It was found that the mechanical strength of the sintered sol-gel derived Bioglass® scaffolds was significantly improved, attributable to the small fraction of material on the pore walls. More importantly, the compressive strength of the three-dimensional scaffolds produced by this surfactant foaming method could be predicted using Gibson and Ashby's closed cell model of porous networks. A comparative experiment revealed that ion release from the sol-gel derived Bioglass® foams was faster than that of counterparts produced by the replication technique. In vitro evaluation using osteoblast-like cells demonstrated that the sol-gel derived 45S5 Bioglass foams supported the proliferation of viable cell populations on the surface of the scaffolds, although few cells were observed to migrate into the virtually closed pores within the foams. Further work should be focused on modifications of the reaction conditions or alternative foaming techniques to improve pore interconnection.
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11
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Controlling Fibroblast Adhesion with Ph Modified Polyelectrolyte Multilayers. Int J Artif Organs 2011; 34:185-91. [DOI: 10.5301/ijao.2011.6395] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/12/2010] [Indexed: 11/20/2022]
Abstract
Tissue cells need to adhere to a biomaterial surface to promote their growth and differentiation and, thus, foster the integration of implants. As a result, surface features and their modification play an important role in biomedical applications. In this study, the layer-by-layer (LbL) technique was used to design self-assembled polyelectrolyte multilayer (PEM) coatings of polyethyleneimine (PEI) and heparin (HEP) on glass, which will control the adhesion of primary human dermal fibroblasts in a model system. The study showed that, among other surface features, the wettability of surfaces can be controlled by changing the conditions during multilayer self-assembly. Here, the pH value of the HEP solution was adjusted to acidic or alkaline values for terminal layers, which also led to a change in multilayer growth. Further, the study revealed that plain terminal layers were rather cytophobic. Upon pre-adsorption of fibronectin (FN), a clear effect on cell adhesion and morphology in dependence on the pH setup was evident. Proliferation studies clearly showed that terminal layers, which impaired cell adhesion, also inhibited growth of human fibroblasts under serum-conditions. On the other hand, on layers with pronounced cell adhesion an elevated cell growth was also observed. As a result, HEP terminated multilayers are interesting for applications requiring cell repellent properties, whereas PEI terminated multilayers could be used to promote cell adhesion and growth on implant surfaces.
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Baran ET, Tuzlakoğlu K, Salgado A, Reis RL. Microchannel-patterned and heparin micro-contact-printed biodegradable composite membranes for tissue-engineering applications. J Tissue Eng Regen Med 2010; 5:e108-14. [DOI: 10.1002/term.368] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Accepted: 08/30/2010] [Indexed: 11/10/2022]
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Liu ZM, Gu Q, Xu ZK, Groth T. Synergistic effect of polyelectrolyte multilayers and osteogenic growth medium on differentiation of human mesenchymal stem cells. Macromol Biosci 2010; 10:1043-54. [PMID: 20602423 DOI: 10.1002/mabi.201000086] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Layer-by-layer assembly of biogenic polyelectrolytes (PEL) was carried out on the surface of poly (L-lactide) to generate polyelectrolyte multilayers (PEM) that foster osteogenic differentiation of human mesenchymal stem cell (hMSC). Gelatin (GEL), hyaluronic acid (HA) and heparin (HEP) were chosen as polyanions, while chitosan (CHI) was employed as polycation. Multilayer formation was monitored by surface plasmon resonance and water contact angle measurements showing that layer formation process and surface wetting properties depended on the type of polyanions. While HEP as strong PEL led to thicker and more hydrophilic PEM, layer mass was lower for weak polyanions GEL and HA. Short-term adhesion studies with hMSC showed strong adhesion and spreading of cells on PEM composed of GEL/CHI and low spreading, motile phenotype and aggregation of hMSC on HEP/CHI or HA/CHI. Long term studies over three weeks were carried out to follow growth and differentiation of hMSC on the PEM. Weak osteogenic differentiation of hMSC was observed on GEL/CHI if cells were cultured in normal medium while no osteogenic phenotypes were observed on HEP/CHI or HA/CHI. When cells were cultured in osteogenic differentiation medium, however, PEM composed of HEP/CHI or HA/CHI promoted differentiation of hMSC towards osteoblasts, while PEM composed of GEL/CHI failed to do so. Overall, the composition of PEMs can be used as additional tool to control osteogenic differentiation of hMSC.
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Affiliation(s)
- Zhen-Mei Liu
- Biomedical Materials Group, Department of Pharmaceutics and Biopharmaceutics, Institute of Pharmacy, Martin-Luther-University Halle-Wittenberg, Heinrich-Damerow-Strasse 4, 06120 Halle (Saale), Germany
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Sher P, Custódio CA, Mano JF. Layer-by-layer technique for producing porous nanostructured 3D constructs using moldable freeform assembly of spherical templates. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2010; 6:2644-2648. [PMID: 20938984 DOI: 10.1002/smll.201001066] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Affiliation(s)
- Praveen Sher
- 3Bs Research Group - Biomaterials, Biodegradables and Biomimetics, AvePark, Zona Industrial da Gandra, S Cláudio do Barco, 4806-909 Caldas das Taipas, Guimarães, Portugal.
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Liu ZM, Gu QY, Barry A, Xu ZK, Groth T. Biogenic Polyelectrolyte Multilayers on Poly(L-lactide) Films for Control of Osteoblast Adhesion. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/masy.201050812] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Yuan W, Fu J, Su K, Ji J. Self-assembled chitosan/heparin multilayer film as a novel template for in situ synthesis of silver nanoparticles. Colloids Surf B Biointerfaces 2009; 76:549-55. [PMID: 20071156 DOI: 10.1016/j.colsurfb.2009.12.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2009] [Revised: 12/10/2009] [Accepted: 12/18/2009] [Indexed: 11/25/2022]
Abstract
Chitosan and heparin multilayer films were successfully constructed via layer-by-layer self assembly. These films were used as a polymeric template to synthesize silver nanoparticles. The silver concentration and nanoparticle size can be simply controlled by the assembly pH and loading pH, as demonstrated by UV-visible spectroscopy, transmission electron microscopy and atomic absorbance spectroscopy. The pH tunable uncompensated charge density within the multilayer films is believed to have great effect on the loading of silver ions, and then control the size and amount of silver nanoparticles within multilayer films. The antibacterial experiment shows that the silver nanoparticle-loaded chitosan/heparin multilayer films exhibit greatly enhanced antibacterial performance compared to the chitosan/heparin multilayer films without silver nanoparticles. In addition, the strong antibacterial property of silver nanoparticle-loaded films can last more than 1 month. Our method of in situ synthesis of metal nanoparticles in biocompatible multilayer films might provide great potential to design biofunctional nanocomposite films.
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Affiliation(s)
- Weiyong Yuan
- Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, PR China
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Implementation of new software for fast screening of cell compatibility on surface modifications using low-contrast time-lapsed microscopy. Clin Oral Investig 2009; 14:499-506. [DOI: 10.1007/s00784-009-0339-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2009] [Accepted: 08/07/2009] [Indexed: 11/27/2022]
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Niepel MS, Peschel D, Sisquella X, Planell JA, Groth T. pH-dependent modulation of fibroblast adhesion on multilayers composed of poly(ethylene imine) and heparin. Biomaterials 2009; 30:4939-47. [PMID: 19573910 DOI: 10.1016/j.biomaterials.2009.06.014] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Accepted: 06/05/2009] [Indexed: 10/20/2022]
Abstract
Adhesion of tissue cells is a prerequisite for their growth and differentiation but prevents also apoptosis. Here the layer-by-layer technique (LbL) was used to design multilayer structures of poly(ethylene imine) (PEI) and heparin (HEP) on glass as model biomaterial to control the adhesion of primary human dermal fibroblasts. Distinct surface features like wettability, charge and lateral structures were controlled by changing the pH value of the HEP solution during multilayer assembly to acidic, neutral or alkaline values. While plain terminal layers were rather cytophobic, the pre-adsorption of serum or fibronectin (FN) caused a distinct change in cell morphology in dependence on the pH setup. The effect of serum was more prominent on PEI layers probably due to their positive surface charge, whereas the effect of FN was more pronounced on HEP terminated multilayers possibly due to its ability to bind FN specifically. Those layers which hampered cell adhesion also inhibited growth of human fibroblasts under serum conditions. Conversely, on layers where cell adhesion was increased also an elevated growth and, thus, metabolic activity was observed.
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Affiliation(s)
- Marcus S Niepel
- Biomedical Materials Group, Department of Pharmaceutical Technology and Biopharmacy, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, D-06099 Halle (Saale), Germany
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