1
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Shen Q. Advances in surface properties characterization and modification for lignin. Int J Biol Macromol 2023; 253:126806. [PMID: 37703980 DOI: 10.1016/j.ijbiomac.2023.126806] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Revised: 08/31/2023] [Accepted: 09/06/2023] [Indexed: 09/15/2023]
Abstract
Renewed interests on lignin and its derivatives have led to increasingly more investigations due to the problems in environmental impact while with the great reuse possibilities for producing them-based new and advanced materials to reduce the petroleum achieving sustainable development. The related studies have shown more integrated database on the surface properties characterization and modification of those renewable materials. Based on numerous works did at our group and others reported elsewhere, this review covers the surface properties of lignin and its derivatives in relation to various methods and theories. In this work, the progress on the recent developments of advanced methods for lignin surface characterization and modification are also documented. Of this review, a perspective is finally presented.
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Affiliation(s)
- Qing Shen
- State Key Laboratory for Modification of Chemical Fibers and Polymers, Polymer Department of Donghua University, 2999 Renmin Rd., 201600 Songjiang, Shanghai, PR China.
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2
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Alkafeef SF. Approximation of electrical double-layer thickness in hydrocarbon systems flowing through the pores of reservoir rocks. Adv Colloid Interface Sci 2023; 320:102985. [PMID: 37734251 DOI: 10.1016/j.cis.2023.102985] [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: 03/01/2023] [Revised: 07/24/2023] [Accepted: 08/17/2023] [Indexed: 09/23/2023]
Abstract
In porous systems, such as in oil reservoir rock formations, the double layers from opposite sides of the pores may overlap if the pore size is narrow. This overlap is relatively likely to occur under low-electrolyte concentrations, such as those in crude oil, thus markedly affecting the electrokinetic measurements. This article evaluates the effects of overlap of the diffuse layers in the narrow capillaries of the reservoir rock cores in oils. Methods were developed to estimate the double-layer thickness in hydrocarbon systems, and to predict the effects of double-layer overlap on the streaming current and hence on the calculation of surface potentials for flat-sided capillaries. These methods are used to interpret results from sandstone cores in crude oil and hydrocarbon solvents. The estimation of double-layer thickness in non-aqueous solvents on the basis of 1:1 charge carriers by analogy to water systems, with correction for viscosity and permittivity differences provides good results with respect to those from streaming current measurements.
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Affiliation(s)
- Saad F Alkafeef
- Petrophysics & Surface Chemistry Research Laboratory, Petroleum Engineering Department, College of Technological Studies, P.O. Box 32, Hadyia 52851, Kuwait.
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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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Zuo R, Lu X, Wei C, Xiong S, Chen J, Zhang S, Huang P, Yang B. The response of bioactive titanium surfaces with different structure to UVC-irradiation to eliminate the negative effect on biological properties during aging time. Biomed Mater 2022; 17. [PMID: 35042197 DOI: 10.1088/1748-605x/ac4c8d] [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: 09/21/2021] [Accepted: 01/18/2022] [Indexed: 11/11/2022]
Abstract
The biological aging of titanium implants affects the service lifetime negatively in clinical applications, and UV irradiation is an applicable method to overcome the biological aging. This study investigated the changes in surface characteristics and biological properties of bioactive titanium surfaces with different structure and topography after UVC-irradiation. The bioactive titanium surfaces were prepared by anodizing (AO), sandblasting and acid-etching (SLA), acid-alkali etching (AA), alkali-heat etching (AH) methods. Samples were stored at dark for 7 weeks to simulate biological aging process and then irradiated by UVC for 2 hours. The results showed that the Ti-OH groups, which are crucial to enhance the biological properties, were easier to be generated on AO surfaces by UVC-irradiation, o owing to a mixture of anatase and rutile on surfaces. UVC-irradiation had the strongest effect on AO surfaces to enhance the bioactivity in bone-like apatite deposition and better biocompatibility in MSCs attachment and proliferation. Therefore, titanium surfaces with a mixture phase of anatase and rutile has the potential to effectively utilize the benefits of UVC-irradiation to overcome the negative effects of the biological aging and have a promising clinical application prospect.
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Affiliation(s)
- Rui Zuo
- Sichuan University, No. 24, South Section, First Ring Road, Chengdu, Chengdu, Sichuan, 610065, CHINA
| | - Xugang Lu
- Sichuan University, No. 24, South Section, First Ring Road, Chengdu, Chengdu, Sichuan, 610065, CHINA
| | - Changsheng Wei
- Sichuan University, No. 24, South Section, First Ring Road, Chengdu, Chengdu, Sichuan, 610065, CHINA
| | - Shibing Xiong
- Sichuan University, No. 24, South Section, First Ring Road, Chengdu, Chengdu, Sichuan, 610065, CHINA
| | - Jun Chen
- Sichuan University, No. 24, South Section, First Ring Road, Chengdu, Chengdu, Sichuan, 610065, CHINA
| | - Siqi Zhang
- Sichuan University, No. 24, South Section, First Ring Road, Chengdu, Chengdu, Sichuan, 610065, CHINA
| | - Ping Huang
- Panzhihua University, No. 10, Airport Road of East District, Panzhihua City, Sichuan Province, Panzhihua, Sichuan, 617000, CHINA
| | - Bangcheng Yang
- Centre for Engineering Research in Biomaterials, Sichuan University, Chengdu 610064, People's Republic of China, Chengdu, Sichuan, 610065, CHINA
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5
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Kenechukwu FC, Dias ML, Ricci-Júnior E. Biodegradable nanoparticles from prosopisylated cellulose as a platform for enhanced oral bioavailability of poorly water-soluble drugs. Carbohydr Polym 2021; 256:117492. [PMID: 33483021 DOI: 10.1016/j.carbpol.2020.117492] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 12/04/2020] [Accepted: 12/05/2020] [Indexed: 11/18/2022]
Abstract
Bio-inspired nanotechnology-based strategies are potential platforms for enhanced dissolution and oral biovailability of poorly water-soluble drugs. In this study, a recently patented green biopolymer (Prosopis africana gum, PG) was compatibilized with microcrystalline cellulose (MCC), a conventional polysaccharide, via thermo-regulated coacervation to obtain PG-MCC (1:0, 1:1, 1:2, 2:1, and 0:1) rational blends and the nanoparticles developed with optimized (1:1) biocomposites (termed "prosopisylated cellulose") by combined homogenization-nanoprecipitation technique was engineered as a high circulating system for improved oral bioavailability of griseofulvin (GF), a model Biopharmaceutics Classification System (BCS) Class-II drug. The effects of biopolymer interaction on morphological and microstructural properties of drug-free biocomposites obtained were investigated by Fourier transform infra-red spectroscopy, scanning electron microscopy and x-ray diffractometry, while the physicochemical properties and in-vivo pharmacokinetics of GF-loaded nanoparticles were also ascertained. Optimized biocomposites revealed inter-molecular and intra-molecular hydrogen bonding between the hydroxyl group of MCC and polar components of PG, as well as reduction in crystallinity of MCC. Griseofulvin-loaded nanoparticles were stable, displayed particles with relatively smooth surfaces and average size of 26.18 ± 0.94 . nm, with zeta potential and polydispersity index of 32.1 ± 0.57 mV and 0.173 ± 0.06, respectively. Additionally, the nanoparticles showed good entrapment efficiency (86.51 ± 0.93 %), and marked improvement in griseofulvin dissolution when compared to free drug, with significantly (p < 0.05) higher GF release in basic than acidic PEG-reinforced simulated bio-microenvironments. Besides, x-ray diffractogram of GF-loaded nanoparticles showed amorphization with few characteristic peaks of GF while infra-red spectrum indicated broader principal peaks of GF and components compatibility. Furthermore, GF-loaded nanoparticles showed low plasma clearance with three-fold increase in systemic bioavailability of griseofulvin compared with free drug. These results showed that prosopisylated cellulose nanoparticles would be a facile approach to improve oral bioavailability of BCS class-II drugs and can be pursued as a new versatile drug delivery platform.
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Affiliation(s)
- Franklin Chimaobi Kenechukwu
- Drug Delivery and Nanomedicines Research Group, Department of Pharmaceutics, Faculty of Pharmaceutical Sciences, University of Nigeria, Nsukka, Enugu State, 410001, Nigeria; Instituto de Macromoléculas Professora Eloisa Mano (IMA), Programa de Ciencia e Tecnologia de Polimeros, Centro de Tecnologia, Universidade Federal do Rio de Janeiro (UFRJ), Brazil.
| | - Marcos Lopes Dias
- Instituto de Macromoléculas Professora Eloisa Mano (IMA), Programa de Ciencia e Tecnologia de Polimeros, Centro de Tecnologia, Universidade Federal do Rio de Janeiro (UFRJ), Brazil
| | - Eduardo Ricci-Júnior
- Nanomedicines Unit, Facultade de Pharmacia, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro-RJ, Brazil
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6
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Jiang C, Huang T, Chen Y, Su Z, Yan X, Xu Q, Jiang M, Liu P. The effect of grafting monomer charge on the antifouling performance of poly(ether ether ketone) hollow fiber membrane by ultraviolet irradiation polymerization. POLYM INT 2020. [DOI: 10.1002/pi.6159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Chunhui Jiang
- College of Polymer Science and Engineering Sichuan University Chengdu China
| | - Tingjian Huang
- College of Polymer Science and Engineering Sichuan University Chengdu China
| | - Yuan Chen
- College of Polymer Science and Engineering Sichuan University Chengdu China
| | - Zexi Su
- College of Polymer Science and Engineering Sichuan University Chengdu China
| | - Xiang Yan
- College of Polymer Science and Engineering Sichuan University Chengdu China
| | - Qibin Xu
- College of Polymer Science and Engineering Sichuan University Chengdu China
| | - Mengjin Jiang
- College of Polymer Science and Engineering Sichuan University Chengdu China
| | - Pengqing Liu
- College of Polymer Science and Engineering Sichuan University Chengdu China
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7
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Life inter vivos: modeling regeneration in the relation between bodies and biomaterials. BIOSOCIETIES 2020. [DOI: 10.1057/s41292-020-00206-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Ates M, Tastan BE, Danabas D, Cicek-Cimen IC, Aksu O, Kutlu B, Unal I, Arslan Z. An Evaluation Research About Effects of Characterized Cadmium Selenide (CdSe) and Lead Selenide (PbSe) Quantum Dots on Brine Shrimp (Artemia salina). BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2020; 105:372-380. [PMID: 32705320 DOI: 10.1007/s00128-020-02941-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 07/12/2020] [Indexed: 06/11/2023]
Abstract
Quantum dots (QDs), such as cadmium selenide (CdSe) and lead selenide (PbSe) exhibit excellent optical, magnetic and chemical properties due to their extremely size (ca. 1-10 nm) and are attractive semiconductor nanomaterials for optical studies and energy storage. In this study, aqueous synthesis of CdSe and PbSe QDs in a size range of 2-10 nm was described. Synthesized QDs were characterized using SEM and TEM, DLS, zeta potential, FTIR, EDX and XRD. Highest accumulation (72.5 ± 5.8 mg L-1) of PbSe QDs occurred at 10 ppm suspensions. In general accumulation increased up to 48 h exposure then fluctuate tended to decline. For CdSe QDs, accumulation tended to decrease for 72 h exposure except that for 5 ppm groups. For the elimination period, in general, the elimination levels of PbSe and CdSe QDs from exposed individuals decreased (p < 0.05) even it has some fluctuate.
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Affiliation(s)
- Mehmet Ates
- Graduate Institute of Education, Department of Biotechnology, Munzur University, 62000, Tunceli, Turkey.
| | - Burcu Ertit Tastan
- Vocational School of Health Services, Gazi University, 06830, Ankara, Turkey
| | - Durali Danabas
- Department of Veterinary Medicine, Pertek Sakine GENC Vocational School, Munzur University, 62000, Tunceli, Turkey
| | | | - Onder Aksu
- Department of Aquaculture, Fisheries Faculty, Munzur University, 62000, Tunceli, Turkey
| | - Banu Kutlu
- Department of Basis Sciences, Fisheries Faculty, Munzur University, 62000, Tunceli, Turkey
| | - Ilkay Unal
- Faculty of Fine Arts, Munzur University, 62000, Tunceli, Turkey
| | - Zikri Arslan
- Department of Biochemistry and Chemistry, Jackson State University, Jackson, MS, 39217, USA
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9
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Huang H, Toit HD, Besenhard MO, Ben-Jaber S, Dobson P, Parkin I, Gavriilidis A. Continuous flow synthesis of ultrasmall gold nanoparticles in a microreactor using trisodium citrate and their SERS performance. Chem Eng Sci 2018. [DOI: 10.1016/j.ces.2018.06.050] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Tereshchenko SA, Shalaev PV, Masloboev YP, Dolgushin SA, Deshabo VA, Yudin IK. Electrokinetic Potential of Nanorods and Cells in Liquid Dispersions. BIOMEDICAL ENGINEERING 2017. [DOI: 10.1007/s10527-017-9650-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Ouyang L, Zhao Y, Jin G, Lu T, Li J, Qiao Y, Ning C, Zhang X, Chu PK, Liu X. Influence of sulfur content on bone formation and antibacterial ability of sulfonated PEEK. Biomaterials 2016; 83:115-26. [PMID: 26773668 DOI: 10.1016/j.biomaterials.2016.01.017] [Citation(s) in RCA: 147] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Revised: 12/28/2015] [Accepted: 01/01/2016] [Indexed: 12/19/2022]
Abstract
Polyetheretherketone (PEEK) is desirable in orthopedic and dental applications because its mechanical properties are similar to those of natural bones but the bioinertness and inferior osteoconduction of PEEK have hampered many clinical applications. In this work, PEEK is sulfonated by concentrated sulfuric acid to fabricate a three-dimensional (3D) network. A hydrothermal treatment is subsequently conducted to remove the residues and the temperature is adjusted to obtain different sulfur concentrations. In vitro cell proliferation and real-time PCR analyses disclose enhanced proliferation and osteogenic differentiation of rat bone mesenchymal stem cells (rBMSCs) on the samples with small sulfur concentrations. The in vitro antibacterial evaluation reveals that all the sulfonated samples possess excellent resistance against Staphylococcus aureus and Escherichia coli. The in vivo rat femur implantation model is adopted and X-ray, micro-CT, and histological analyses indicate that not only the premeditated injected bacteria cells are sterilized, but also new bone forms around the samples with small sulfur concentrations. The in vitro and in vivo results reveal that the samples subjected to the hydrothermal treatment to remove excess sulfur have better osseointegration and antibacterial ability and PEEK modified by sulfonation and hydrothermal treatment is promising in orthopedic and dental applications.
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Affiliation(s)
- Liping Ouyang
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Yaochao Zhao
- Department of Orthopedics, Shanghai Sixth People's Hospital, Shanghai Jiao Tong University, Shanghai, 200233, China
| | - Guodong Jin
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Tao Lu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Jinhua Li
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Yuqin Qiao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Congqin Ning
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China
| | - Xianlong Zhang
- Department of Orthopedics, Shanghai Sixth People's Hospital, Shanghai Jiao Tong University, Shanghai, 200233, China.
| | - Paul K Chu
- Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
| | - Xuanyong Liu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China.
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12
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Elschner T, Reishofer D, Kargl R, Grießer T, Heinze T, Kleinschek KS. Reactive cellulose-based thin films – a concept for multifunctional polysaccharide surfaces. RSC Adv 2016. [DOI: 10.1039/c6ra14227c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Reactive coatings of hydroxyethyl cellulose furoate in the form of thin films, suitable for the covalent immobilization of functional molecules, were developed and characterized in this work.
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Affiliation(s)
- Thomas Elschner
- Faculty of Mechanical Engineering
- Laboratory for Characterization and Processing of Polymers
- University of Maribor
- 2000 Maribor
- Slovenia
| | - David Reishofer
- Institute for Chemistry and Technology of Materials
- Graz University of Technology
- 8010 Graz
- Austria
| | - Rupert Kargl
- Faculty of Mechanical Engineering
- Laboratory for Characterization and Processing of Polymers
- University of Maribor
- 2000 Maribor
- Slovenia
| | - Thomas Grießer
- Chair of Chemistry of Polymeric Materials
- University of Leoben
- 8700 Leoben
- Austria
| | - Thomas Heinze
- Center of Excellence for Polysaccharide Research
- Institute for Organic Chemistry and Macromolecular Chemistry
- Friedrich Schiller University of Jena
- D-07743 Jena
- Germany
| | - Karin Stana Kleinschek
- Faculty of Mechanical Engineering
- Laboratory for Characterization and Processing of Polymers
- University of Maribor
- 2000 Maribor
- Slovenia
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13
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Yang Y, Köwitsch A, Ma N, Mäder K, Pashkuleva I, Reis RL, Groth T. Functionality of surface-coupled oxidised glycosaminoglycans towards fibroblast adhesion. J BIOACT COMPAT POL 2015. [DOI: 10.1177/0883911515599999] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Glycosaminoglycans are able to bind many growth factors and adhesive proteins, which affect cell activities such as adhesion, migration, growth and differentiation. Chondroitin sulphate, hyaluronan, sulphated hyaluronan and heparin were oxidised here (aldehyde glycosaminoglycans) to generate aldehydes on vicinal hydroxyl groups of the uronic monomers of glycosaminoglycans for subsequent direct covalent binding to amino-terminated model substrata. The properties of modified surfaces were monitored by water contact angle, zeta potential, ellipsometry measurements and atomic force microscopy showing successful immobilisation of aldehyde glycosaminoglycans. Wetting properties and zeta potentials were related to sulphate content of aldehyde glycosaminoglycans with aldehyde heparin as most wettable and negative surface and aldehyde hyaluronan as the least. The thickness of surface layers measured by ellipsometry indicated a predominant side-on immobilisation of all aldehyde glycosaminoglycans. Atomic force microscopy studies showed that immobilisation of aldehyde hyaluronan lead to a rather smooth surface coating while immobilisation of sulphated aldehyde glycosaminoglycans was characterised by a globular appearance of surfaces with higher roughness. The experiments with human fibroblast studying adhesion under serum-free conditions were carried out to learn about bioactivity of aldehyde glycosaminoglycans. It was observed that the increase in sulphation degree of aldehyde glycosaminoglycans was accompanied by increased adhesion and spreading of cells with stronger expression of focal adhesions and cytoskeletal structures. By contrast, cell adhesion and spreading were lower on aldehyde hyaluronan. Immunofluorescence staining of cells in contact with aldehyde hyaluronan revealed a stronger expression of CD44, which can represent an alternative route of cell adhesion. The results show that oxidised glycosaminoglycans can be successfully applied for the development of bioactive surface coatings. The created biomimetic microenvironment may be useful to engineer surfaces of implants and scaffolds for tissue regeneration.
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Affiliation(s)
- Yuan Yang
- Biomedical Materials Group, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Alexander Köwitsch
- Biomedical Materials Group, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Ning Ma
- Biomedical Materials Group, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Karsten Mäder
- Pharmaceutical Technology Group, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - Iva Pashkuleva
- 3B’s Research Group – Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimaraes, Portugal
- ICVS/3B’s – PT Government Associate Laboratory, Braga/Guimaraes, Portugal
| | - Rui L Reis
- 3B’s Research Group – Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimaraes, Portugal
- ICVS/3B’s – PT Government Associate Laboratory, Braga/Guimaraes, Portugal
| | - Thomas Groth
- Biomedical Materials Group, Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
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14
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Zou P, Laird D, Riga EK, Deng Z, Dorner F, Perez-Hernandez HR, Guevara-Solarte DL, Steinberg T, Al-Ahmad A, Lienkamp K. Antimicrobial and cell-compatible surface-attached polymer networks - how the correlation of chemical structure to physical and biological data leads to a modified mechanism of action. J Mater Chem B 2015; 3:6224-6238. [PMID: 32262741 DOI: 10.1039/c5tb00906e] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
We present a synthetic platform based on photo-induced thiol-ene chemistry, by which surface-attached networks from antimicrobial poly(oxonorbornene) (so-called polymeric synthetic mimics of antimicrobial peptides, SMAMPs) could be easily obtained. By systematically varying hydrophobicity and charge density, surface-attached polymer networks with high antimicrobial activity and excellent cell compatibility were obtained. For the homopolymer networks with constant charge density, antimicrobial activity increased systematically with increasing hydrophobicity (i.e. decreasing swellability and apparent surface energy). Irrespective of charge density, the antimicrobial activity of all networks correlated with the acid constant pK and the isoelectric point (IEP) - the lower pK and IEP, the higher the antimicrobial activity. The cell compatibility of the networks increased with increasing swellability and apparent surface energy, and decreased with increasing charge density. The data corroborates that the mechanism of action of antimicrobial polymer surfaces depends on at least two mechanistic steps, one of which is hydrophobicity-driven and the other charge related. Therefore, we suggest a modified mechanistic model with a charge-driven and a hydrophobicity-driven step. For antimicrobial networks that only varied in hydrophobicity, the antimicrobial activities on surfaces and in solution also correlated - the higher the activity in solution, the higher the activity on surfaces. Thus, the hydrophobicity-driven step for activity on surfaces may be similar to the one in solution. Cell compatibility of SMAMPs in solution and on surfaces also showed a systematic positive correlation for all polymers, therefore this property also depends on the net hydrophobic balance of the polymer.
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Affiliation(s)
- Peng Zou
- Department of Microsystems Engineering (IMTEK), Albert-Ludwigs-Universität, Georges-Köhler-Allee 103, 79110 Freiburg, Germany.
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15
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Lorenzetti M, Luxbacher T, Kobe S, Novak S. Electrokinetic behaviour of porous TiO2-coated implants. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2015; 26:191. [PMID: 25989934 DOI: 10.1007/s10856-015-5521-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Accepted: 03/17/2015] [Indexed: 06/04/2023]
Abstract
It is known that the "race for the surface" determining the in vivo response is strictly connected to the physico-chemical properties of the material, especially at its surface. Accordingly, the study of surface roughness, charge and wettability is fundamental to predict the bio-response to the implant. In this work, streaming potential was chosen as a reliable method to quantify the solid surface charge of hydrothermally treated (HT) TiO2-anatase nano-crystalline coatings, grown on titanium substrates. The influence of metal and ionic conductance on the zeta potential values was taken into account, allowing for the correlation of the surface charge with the coating porosity, the semiconductor character of the TiO2 nano-crystals and the metallic nature of the bulk titanium.
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Affiliation(s)
- Martina Lorenzetti
- Department for Nanostructured Materials, Jožef Stefan Institute, Jamova cesta 39, 1000, Ljubljana, Slovenia,
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16
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Ahmed F, Roy Choudhury N, Dutta NK, Zou L, Zannettino A. Fabrication and characterisation of an electrospun tubular 3D scaffold platform of poly(vinylidene fluoride-co-hexafluoropropylene) for small-diameter blood vessel application. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2014; 25:2023-41. [DOI: 10.1080/09205063.2014.968018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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17
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Ostolska I, Wiśniewska M. Application of the zeta potential measurements to explanation of colloidal Cr 2O 3 stability mechanism in the presence of the ionic polyamino acids. Colloid Polym Sci 2014; 292:2453-2464. [PMID: 25242857 PMCID: PMC4164842 DOI: 10.1007/s00396-014-3276-y] [Citation(s) in RCA: 128] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Revised: 05/06/2014] [Accepted: 05/14/2014] [Indexed: 11/25/2022]
Abstract
In the presented paper, the influence of the molecular weight and the type of polyamino acid functional groups on the electrokinetic properties and the stability of chromium (III) oxide suspension were examined. Analysis of the data obtained from the adsorption, potentiometric titration, zeta potential, and stability measurements allows to propose stabilization or destabilization mechanism of the studied systems. In the studies, there were used polyamino acids with different ionic characters: anionic polyaspartic acid and cationic polylysine. The measurements showed that the zeta potential depends on the concentration and molecular weight of the applied polymer. Stability of the chromium (III) oxide suspensions in the presence of ionic polyamino acids increases compared to the results obtained in the absence of polymers. The exception is LYS 4,900 at pH = 10. Under these conditions, the decrease in stability is observed due to formation of polymer bridges between the polymer chains adsorbed on different colloidal particles. Determination of the stabilization/destabilization mechanism of the polyamino acid/chromium (III) oxide system and examination of the effects of polymer molecular weight on the stabilization properties can contribute to a wider use of this group of compounds as potential stabilizers or flocculants in many industrial suspensions.
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Affiliation(s)
- Iwona Ostolska
- Department of Radiochemistry and Colloids Chemistry, Faculty of Chemistry, Maria Curie-Sklodowska University, M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland
| | - Małgorzata Wiśniewska
- Department of Radiochemistry and Colloids Chemistry, Faculty of Chemistry, Maria Curie-Sklodowska University, M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland
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18
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Wang H, Lu T, Meng F, Zhu H, Liu X. Enhanced osteoblast responses to poly ether ether ketone surface modified by water plasma immersion ion implantation. Colloids Surf B Biointerfaces 2014; 117:89-97. [DOI: 10.1016/j.colsurfb.2014.02.019] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 01/25/2014] [Accepted: 02/08/2014] [Indexed: 10/25/2022]
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19
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Sonmez B, Sayin S, Yalcinkaya EE, Seleci DA, Yildiz HB, Demirkol DO, Timur S. Calixarene modified montmorillonite: a novel design for biosensing applications. RSC Adv 2014. [DOI: 10.1039/c4ra11818a] [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
Here we report the synthesis, characterization and application of calixarene (Calix) modified montmorillonite (Mt) as a platform for bio-applications such as biomolecule immobilization and biosensing technologies.
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Affiliation(s)
- Burak Sonmez
- Ege University Faculty of Science
- Biochemistry Department
- 35100 Bornova-Izmir, Turkey
| | - Serkan Sayin
- KTO Karatay University
- Department of Materials Science and Nanotechnology Engineering
- 42020 Konya, Turkey
| | | | - Didem Ag Seleci
- Ege University Faculty of Science
- Biochemistry Department
- 35100 Bornova-Izmir, Turkey
| | - Huseyin Bekir Yildiz
- KTO Karatay University
- Department of Materials Science and Nanotechnology Engineering
- 42020 Konya, Turkey
| | - Dilek Odaci Demirkol
- Ege University Faculty of Science
- Biochemistry Department
- 35100 Bornova-Izmir, Turkey
- Ege University
- Institute of Drug Abuse Toxicology &Pharmaceutical Sciences
| | - Suna Timur
- Ege University Faculty of Science
- Biochemistry Department
- 35100 Bornova-Izmir, Turkey
- Ege University
- Institute of Drug Abuse Toxicology &Pharmaceutical Sciences
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20
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Demir F, Demir B, Yalcinkaya EE, Cevik S, Odaci Demirkol D, Anik U, Timur S. Amino acid intercalated montmorillonite: electrochemical biosensing applications. RSC Adv 2014. [DOI: 10.1039/c4ra07026g] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The present work is the first that includes the use of glycine (Gly), lysine (Lys) and glutamic acid (Glu) modified clay mineral matrices in the biosensors.
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Affiliation(s)
- Filiz Demir
- Ege University
- Faculty of Sciences
- Biochemistry Department
- 35100-Bornova, Turkey
| | - Bilal Demir
- Ege University
- Faculty of Sciences
- Biochemistry Department
- 35100-Bornova, Turkey
| | - Esra E. Yalcinkaya
- Ege University
- Faculty of Sciences
- Chemistry Department
- 35100-Bornova, Turkey
| | - Serdar Cevik
- Mugla Sitki Kocman University
- Faculty of Sciences
- Chemistry Department
- Mugla, Turkey
| | | | - Ulku Anik
- Mugla Sitki Kocman University
- Faculty of Sciences
- Chemistry Department
- Mugla, Turkey
| | - Suna Timur
- Ege University
- Faculty of Sciences
- Biochemistry Department
- 35100-Bornova, Turkey
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21
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Berger O, Fischer WJ. Photo-induced switchable TiO2thin films for biological applications. BIOINSPIRED BIOMIMETIC AND NANOBIOMATERIALS 2013. [DOI: 10.1680/bbn.13.00005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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22
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Pinho AC, Piedade AP. Zeta potential, contact angles, and AFM imaging of protein conformation adsorbed on hybrid nanocomposite surfaces. ACS APPLIED MATERIALS & INTERFACES 2013; 5:8187-8194. [PMID: 23899633 DOI: 10.1021/am402302r] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The sputtering deposition of gold (Au) and poly(tetrafluoroethylene) (PTFE) was used to prepare a nanocomposite hybrid thin film suitable for protein adsorption while maintaining the native conformation of the biological material. The monolithic PTFE and the nanocomposite PTFE/Au thin films, with Au content up to 1 at %, were co-deposited by r.f. magnetron sputtering using argon as a discharge gas and deposited onto 316L stainless steel substrates, the most commonly used steel in biomaterials. The deposited thin films, before and after bovine serum albumin (BSA) adsorption, were thoroughly characterized with special emphasis on the surface properties/characteristics by atomic force microscopy (AFM), zeta potential, and static and dynamic contact angle measurements, in order to assess the relationship between structure and conformational changes. The influence of a pre-adsorbed peptide (RGD) was also evaluated. The nanotopographic and chemical changes induced by the presence of gold in the nanocomposite thin films enable RGD bonding, which is critical for the maintenance of the BSA native conformation after adsorption.
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Affiliation(s)
- Ana C Pinho
- CEMUC-GNM, Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal
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23
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Amorim S, Pires RA, da Costa DS, Reis RL, Pashkuleva I. Interactions between exogenous FGF-2 and sulfonic groups: in situ characterization and impact on the morphology of human adipose-derived stem cells. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:7983-7992. [PMID: 23725085 DOI: 10.1021/la400871c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
FGF-2 is often used as a supplement to stem cells culture medium aiming at preserving their self-renewal capacity and plasticity through the passages. However, little is known on the influence of the underlying substrate in these interactions. In this study, we have used mixed self-assembled monolayers with different ratios of -SO3H and -OH tail groups to investigate the influence of substrate properties (e.g., charge) on the FGF-2 adsorption and activity. QCM-D data demonstrated that, in the presence of -OH groups, the quantity of the adsorbed FGF-2 is proportional to the percentage of surface -SO3H groups. The bioactivity of the adsorbed FGF-2 follows the same tendency as demonstrated by its interactions with anti-FGF-2. Surprisingly, the adlayer of FGF-2 formed on the surface containing only SO3H-tailed SAMs was similar to the surface with 25% of -SO3H groups, demonstrating that FGF-2 adsorption is not solely driven by electrostatic interactions. We related these results with changes in the morphology of adipose-derived stem cells (ASCs) cultured on the same surfaces.
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Affiliation(s)
- Sara Amorim
- 3B's Research Group - Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, 4806-909 Taipas, Guimarães, Portugal
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24
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Bernstein R, Antón E, Ulbricht M. Tuning the nanofiltration performance of thin film strong polyelectrolyte hydrogel composite membranes by photo-grafting conditions. J Memb Sci 2013. [DOI: 10.1016/j.memsci.2012.09.034] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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25
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26
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Liu R, He B, Li D, Lai Y, Tang JZ, Gu Z. Synthesis and characterization of poly(ethylene glycol)-b-poly(l-histidine)-b-poly(l-lactide) with pH-sensitivity. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.02.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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27
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Gallardo-Moreno AM, Vadillo-Rodríguez V, Perera-Núñez J, Bruque JM, González-Martín ML. The zeta potential of extended dielectrics and conductors in terms of streaming potential and streaming current measurements. Phys Chem Chem Phys 2012; 14:9758-67. [DOI: 10.1039/c2cp40743d] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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28
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Surface Characterization of Asymmetric Bi-Soft Segment Poly(ester urethane urea) Membranes for Blood-Oxygenation Medical Devices. Int J Biomater 2011; 2012:376321. [PMID: 22164163 PMCID: PMC3227468 DOI: 10.1155/2012/376321] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Accepted: 08/22/2011] [Indexed: 11/17/2022] Open
Abstract
Asymmetric bi-soft segment poly(ester urethane urea) (PEUU) membranes containing polycaprolactone (PCL) as a second soft segment are synthesized with PCL-diol ranging from 0% to 15% (w/w). Bulk and surface characteristics of the PEUU membranes were investigated by scanning electron microscopy (SEM), static water contact angles, and surface streaming potentials and were correlated to hemocompatibility properties, namely, hemolysis and thrombosis degrees. SEM analysis reveals PEUU membranes with asymmetric cross-sections and top dense surfaces with distinct morphologies. The increase in PCL-diol content yields PEUU membranes with blood-contacting surfaces that are smoother, more hydrophilic, and with higher maximum zeta potentials. The results obtained in this work give no evidence of a correlation between hydrophilicity/zeta potentials and the hemolysis/thrombosis degree of blood-contacting surfaces of the PEUU membranes. In contrast, other hemocompatibility aspects reveal that the more hydrophilic membranes are associated with lower platelet deposition and inhibition of extreme states of platelet activation.
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29
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Antunes JC, Pereira CL, Molinos M, Ferreira-da-Silva F, Dessı̀ M, Gloria A, Ambrosio L, Gonçalves RM, Barbosa MA. Layer-by-Layer Self-Assembly of Chitosan and Poly(γ-glutamic acid) into Polyelectrolyte Complexes. Biomacromolecules 2011; 12:4183-95. [DOI: 10.1021/bm2008235] [Citation(s) in RCA: 92] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
| | | | | | | | - Mariagemiliana Dessı̀
- Institute of Composite and Biomedical Materials, National Research Council,
P.le Tecchio 80, 80125 Naples, Italy
| | - Antonio Gloria
- Institute of Composite and Biomedical Materials, National Research Council,
P.le Tecchio 80, 80125 Naples, Italy
| | - Luigi Ambrosio
- Institute of Composite and Biomedical Materials, National Research Council,
P.le Tecchio 80, 80125 Naples, Italy
| | | | - Mário A. Barbosa
- Institute of Composite and Biomedical Materials, National Research Council,
P.le Tecchio 80, 80125 Naples, Italy
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30
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Adamczyk Z, Nattich M, Wasilewska M, Zaucha M. Colloid particle and protein deposition - electrokinetic studies. Adv Colloid Interface Sci 2011; 168:3-28. [PMID: 21621181 DOI: 10.1016/j.cis.2011.04.002] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Revised: 04/15/2011] [Accepted: 04/18/2011] [Indexed: 11/30/2022]
Abstract
Recent developments in the electrokinetic determination of particle, polyelectrolyte and protein deposition at solid/electrolyte interfaces, are reviewed. In the first section basic theoretical results are discussed enabling a quantitative interpretation of the streaming current/potential and microelectrophoretic measurements. Experimental results are presented, pertinent to electrokinetic characteristics of simple (homogeneous) surfaces such as mica, silica and various polymeric surfaces used in protein studies. The influence of the ionic strength, background electrolyte composition and pH is discussed, and the effective (electrokientic) charge of these interfaces is evaluated. In the next section, experimental data obtained by streaming potential measurements for colloid particle mono- and bilayers are presented and interpreted successfully in terms of available theoretical approaches. These results, obtained for model systems of monodisperse colloid particles are used as reference data for discussion of more complicated experiments performed for polyelectrolyte and protein covered surfaces. Results are discussed, obtained for cationic polyelectrolytes (PEI, PAH) and fibrinogen adsorbing on mica, interpreted quantitatively in terms of the theoretical approach postulating a heterogeneous 3D charge distribution. The Gouy-Chapman model, based on the continuous charge distribution proved inadequate. Interesting experimental data are also discussed, obtained by electrophoretic methods in the case of protein adsorption on colloid latex particles. In the last section, supplementary results on particle deposition on heterogeneous surfaces produced by controlled protein adsorption are discussed. Quantitative relationships between the amount of adsorbed protein, zeta potential of the interface and the particle coverage are specified. Possibility of evaluating the heterogeneity of protein charge distribution is pointed out. The anomalous deposition of colloid particles on protein molecules bearing the same sign of zeta potential, which contradicts classical DLVO theory, is interpreted in terms of the fluctuation theory. It is concluded that theoretical and experimental results obtained for model colloid systems and flat interfaces can be effectively used for interpretation of protein adsorption phenomena, studied by electrophoresis. In this way the universality of electrokinetic phenomena is underlined.
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Affiliation(s)
- Z Adamczyk
- J. Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Cracow, Poland.
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31
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Jiang H, Wang XB, Li CY, Li JS, Xu FJ, Mao C, Yang WT, Shen J. Improvement of hemocompatibility of polycaprolactone film surfaces with zwitterionic polymer brushes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:11575-11581. [PMID: 21851101 DOI: 10.1021/la202101q] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Polycaprolactone (PCL) has been widely adopted as a scaffold biomaterial, but further improvement of the hemocompatibility of a PCL film surface is still needed for wide biomedical applications. In this work, the PCL film surface was functionalized with zwitterionic poly(3-dimethyl(methacryloyloxyethyl) ammonium propane sulfonate) (P(DMAPS)) brushes via surface-initiated atom transfer radical polymerization (ATRP) for enhancing hemocompatibility. Kinetics study revealed an approximately linear increase in graft yield of the functional P(DMAPS) brushes with polymerization time. The blood compatibilities of the modified PCL film surfaces were studied by platelet adhesion tests of platelet-rich plasma and human whole blood, hemolysis assay, and plasma recalcification time (PRT) assay. The improvement of hemocompatibility is dependent on the coverage of the grafted P(DMAPS) brushes on the PCL film. Lower or no platelet and blood cell adhesion was observed on the P(DMAPS)-grafted film surfaces. The P(DMAPS) grafting can further decrease hemolysis and enhance the PRT of the PCL surface. With the versatility of surface-initiated ATRP and the excellent hemocompatibility of zwitterionic polymer brushes, PCL films with desirable blood properties can be readily tailored to cater to various biomedical applications.
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Affiliation(s)
- H Jiang
- State Key Laboratory of Chemical Resource Engineering, Ministry of Education, College of Materials Science & Engineering, Beijing University of Chemical Technology, Beijing 100029 China
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32
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Parreira P, Magalhães A, Gonçalves IC, Gomes J, Vidal R, Reis CA, Leckband DE, Martins MCL. Effect of surface chemistry on bacterial adhesion, viability, and morphology. J Biomed Mater Res A 2011; 99:344-53. [DOI: 10.1002/jbm.a.33178] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2010] [Accepted: 05/13/2011] [Indexed: 01/26/2023]
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33
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Adamczyk Z, Barbasz J, Cieśla M. Mechanisms of fibrinogen adsorption at solid substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:6868-6878. [PMID: 21545097 DOI: 10.1021/la200798d] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Adsorption of fibrinogen, modeled as a linear chain of touching beads of various sizes, was theoretically studied using the random sequential adsorption (RSA) model. The adsorption process was assumed to consist of two steps: (i) formation of an irreversibly bound fibrinogen monolayer under the side-on orientation, which is independent of the bulk protein concentration and (ii) formation of the reversibly bound, end-on monolayer, whose coverage was dependent on the bulk concentration. Calculation based on the RSA model showed that the maximum surface concentration of the end-on (reversible) monolayer equals N(⊥∞) = 6.13 × 10(3) μm(-2) which is much larger than the previously found value for the side-on (irreversible) monolayer, equal to N(∞) = 2.27 × 10(3) μm(-2). Hence, the maximum surface concentration of fibrinogen in both orientations is determined to be 8.40 × 10(3) μm(-2) corresponding to the protein coverage of 5.70 mg m(-2) assuming 20% hydration. Additionally, the surface blocking function (ASF) was determined for the end-on fibrinogen adsorption, approximated for the entire range of coverage by the interpolating polynomial. For the coverage approaching the jamming limit, the surface blocking function (ASF) was shown to vanish proportionally to (θ(⊥∞) - θ(⊥))(2). These calculation allowed one to theoretically predict adsorption isotherms for the end-on regime of fibrinogen and adsorption kinetics under various transport conditions (diffusion and convection). Using these theoretical results, a quantitative interpretation of experimental data obtained by TIRF and ellipsometry was successfully performed. The equilibrium adsorption constant for the end-on adsorption regime was found to be 8.04 × 10(-3) m. On the basis of this value, the depth of the adsorption energy minimum, equal to -17.4 kT, was predicted, which corresponds to ΔG = -41.8 kJ mol(-1). This is in accordance with adsorption energy derived as the sum of the van der Waals and electrostatic interactions. Besides having significance for predicting fibrinogen adsorption, theoretical results derived in this work also have implications for basic science providing information on mechanisms of anisotropic protein molecule adsorption on heterogeneous surfaces.
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Affiliation(s)
- Zbigniew Adamczyk
- J. Haber Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, 30-239 Kraków, Niezapominajek 8, Poland.
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34
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Martins MCL, Ochoa-Mendes V, Ferreira G, Barbosa JN, Curtin SA, Ratner BD, Barbosa MA. Interactions of leukocytes and platelets with poly(lysine/leucine) immobilized on tetraethylene glycol-terminated self-assembled monolayers. Acta Biomater 2011; 7:1949-55. [PMID: 21237292 DOI: 10.1016/j.actbio.2011.01.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2010] [Revised: 12/14/2010] [Accepted: 01/11/2011] [Indexed: 11/28/2022]
Abstract
Surfaces that bind heparin are important for biomaterials for blood deheparinization. In our recent work it was demonstrated that a polypeptide composed of L-lysine and L-leucine (pKL), after immobilization onto tetra(ethylene glycol) terminated self-assembled monolayers (EG4-SAMs), can bind heparin from blood plasma in a selective, concentration-dependent way. During this work the effect of this peptide on platelet adhesion and activation and leukocyte adhesion was studied. The surface charge of these nanostructured surfaces was evaluated in order to correlate the effect of positively charged amine groups and hydrophobic methyl groups on the behavior of platelets and leukocyte adhesion. The results demonstrated that the presence of pKL decreased leukocyte adhesion to EG4-SAMs at all concentrations used. This effect is even more pronounced when surfaces were pre-immersed in heparinized plasma. In contrast, there is an increase in platelet adhesion and activation with increased percentage immobilized pKL. This effect is enhanced when surfaces were pre-immersed in heparinized plasma. However, adsorbed pKL in very low amounts does not induce platelet adhesion and activation compared with EG4, even when pre-immersed in plasma. Since only low pKL amounts are necessary to induce heparin selectivity, these results are promising for the development of heparin-binding biomaterials for blood deheparinization.
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Affiliation(s)
- M Cristina L Martins
- Instituto de Engenharia Biomédica, Divisão de Biomateriais, Universidade do Porto, Rua do Campo Alegre, Portugal.
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35
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Van de Broek B, Frederix F, Bonroy K, Jans H, Jans K, Borghs G, Maes G. Shape-controlled synthesis of NIR absorbing branched gold nanoparticles and morphology stabilization with alkanethiols. NANOTECHNOLOGY 2011; 22:015601. [PMID: 21135459 DOI: 10.1088/0957-4484/22/1/015601] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Gold nanoparticles are ideal candidates for clinical applications if their plasmon absorption band is situated in the near infrared region (NIR) of the electromagnetic spectrum. Various parameters, including the nanoparticle shape, strongly influence the position of this absorption band. The aim of this study is to produce stabilized NIR absorbing branched gold nanoparticles with potential for biomedical applications. Hereto, the synthesis procedure for branched gold nanoparticles is optimized varying the different synthesis parameters. By subsequent electroless gold plating the plasmon absorption band is shifted to 747.2 nm. The intrinsic unstable nature of the nanoparticles' morphology can be clearly observed by a spectral shift and limits their use in real applications. However, in this article we show how the stabilization of the branched structure can be successfully achieved by exchanging the initial capping agent for different alkanethiols and disulfides. Furthermore, when using alkanethiols/disulfides with poly(ethylene oxide) units incorporated, an increased stability of the gold nanoparticles is achieved in high salt concentrations up to 1 M and in a cell culture medium. These achievements open a plethora of opportunities for these stabilized branched gold nanoparticles in nanomedicine.
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36
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Jans H, Stakenborg T, Jans K, Van de Broek B, Peeters S, Bonroy K, Lagae L, Borghs G, Maes G. Increased stability of mercapto alkane functionalized Au nanoparticles towards DNA sensing. NANOTECHNOLOGY 2010; 21:285608. [PMID: 20585165 DOI: 10.1088/0957-4484/21/28/285608] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
The use of gold nanoparticles (GNPs) in bioassays is often hampered by their colloidal stability. In this study, gold nanoparticles coated with different mercapto alkanes were investigated towards their stability. Hereto, the effects of the alkane chain length (5-11 methylene groups), the type of functional end-group (-OH or -COOH) and the amount of incorporated poly-ethylene oxide units (none, 3 or 6) on the GNP stabilization was evaluated. Based on these results, an optimal mercapto alkane (HS(CH(2))(11)PEO(6)COOH) was selected to increase the colloidal stability up to 2 M NaCl. Furthermore, it was proved that this mercapto alkane is ideally suited to enhance the stability of DNA functionalized GNPs in high electrolytic hybridization buffers. The effectiveness of these DNA functionalized GNPs was demonstrated in a sandwich assay using a surface plasmon resonance biosensor. The superior stability of these nanoparticles during hybridization may lead to enhanced biosensor technologies.
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Affiliation(s)
- H Jans
- IMEC, Functional Nanosystems, Kapeldreef 75, B-3001 Leuven, Belgium.
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37
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Adamczyk Z, Nattich M, Zaucha M. Electrokinetics of particle covered surfaces. Curr Opin Colloid Interface Sci 2010. [DOI: 10.1016/j.cocis.2009.10.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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38
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Liu G, Dotzauer DM, Bruening ML. Ion-Exchange Membranes Prepared Using Layer-by-Layer Polyelectrolyte Deposition. J Memb Sci 2010; 354:198-205. [PMID: 20606722 PMCID: PMC2894478 DOI: 10.1016/j.memsci.2010.02.047] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Layer-by-layer polyelectrolyte adsorption in porous polymeric membranes provides a simple way to create ion-exchange sites without greatly decreasing hydraulic permeability (<20% reduction in permeability). At 80% breakthrough, membranes coated with 3-bilayer poly(styrene sulfonate) (PSS)/polyethyleneimine (PEI) films bind 37±6 mg of negatively charged Au colloids per mL of membrane volume. The binding capacity of membranes coated with 1-bilayer films decreases in the order PSS/PEI>PSS/poly(diallyldimethyl ammonium chloride)>PSS/poly(allylamine hydrochloride). Films terminated with a polyanion present cation-exchange sites that bind lysozyme, and the lysozyme-binding capacities of (PSS/PEI)(3)/PSS films increase with the ionic strength of the solution from which the last PSS layer is deposited. Charge screening during deposition of the terminal PSS layer gives rise to a larger number of ion-exchange sites and lysozyme binding capacities as high as 16 mg per mL of membrane. At 10% breakthrough, a stack of 3 membranes binds 3 times as much lysozyme as a single membrane, showing that stacking is an effective way to increase capacity.
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Affiliation(s)
- Guanqing Liu
- Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824
| | - David M. Dotzauer
- Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824
| | - Merlin L Bruening
- Department of Chemistry, Michigan State University, East Lansing, Michigan, 48824
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Adamczyk Z, Sadlej K, Wajnryb E, Nattich M, Ekiel-Jeżewska M, Bławzdziewicz J. Streaming potential studies of colloid, polyelectrolyte and protein deposition. Adv Colloid Interface Sci 2010; 153:1-29. [PMID: 19926067 DOI: 10.1016/j.cis.2009.09.004] [Citation(s) in RCA: 104] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2009] [Revised: 09/24/2009] [Accepted: 09/26/2009] [Indexed: 10/20/2022]
Abstract
Recent developments in the electrokinetic determination of particle, protein and polyelectrolyte monolayers at solid/electrolyte interfaces, are reviewed. Illustrative theoretical results characterizing particle transport to interfaces are presented, especially analytical formulae for the limiting flux under various deposition regimes and expressions for diffusion coefficients of various particle shapes. Then, blocking effects appearing for higher surface coverage of particles are characterized in terms of the random sequential adsorption model. These theoretical predictions are used for interpretation of experimental results obtained for colloid particles and proteins under convection and diffusion transport conditions. The kinetics of particle deposition and the structure of monolayers are analyzed quantitatively in terms of the generalized random sequential adsorption (RSA) model, considering the coupling of the bulk and surface transport steps. Experimental results are also discussed, showing the dependence of the jamming coverage of monolayers on the ionic strength of particle suspensions. In the next section, theoretical and experimental results pertaining to electrokinetics of particle covered surfaces are presented. Theoretical models are discussed, enabling a quantitative evaluation of the streaming current and the streaming potential as a function of particle coverage and their surface properties (zeta potential). Experimental data related to electrokinetic characteristics of particle monolayers, mostly streaming potential measurements, are presented and interpreted in terms of the above theoretical approaches. These results, obtained for model systems of monodisperse colloid particles are used as reference data for discussion of experiments performed for polyelectrolyte and protein covered surfaces. The utility of the electrokinetic measurements for a precise, in situ determination of particle and protein monolayers at various interfaces is pointed out.
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40
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Patra HK, GuhaSarkar D, Dasgupta AK. Multimodal electrophoresis of gold nanoparticles: A real time approach. Anal Chim Acta 2009; 649:128-34. [DOI: 10.1016/j.aca.2009.07.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Revised: 06/27/2009] [Accepted: 07/01/2009] [Indexed: 11/30/2022]
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41
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Zimmermann R, Rein N, Werner C. Water ion adsorption dominates charging at nonpolar polymer surfaces in multivalent electrolytes. Phys Chem Chem Phys 2009; 11:4360-4. [DOI: 10.1039/b900755e] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Kim JT, Weber N, Shin GH, Huang Q, Liu SX. The study of beta-lactoglobulin adsorption on polyethersulfone thin film surface using QCM-D and AFM. J Food Sci 2008; 72:E214-21. [PMID: 17995774 DOI: 10.1111/j.1750-3841.2007.00344.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The adsorption process of beta-lactoglobulin on the polyethersulfone-coated surface has been investigated using a quartz crystal microbalance with dissipation monitoring (QCM-D), which allowed simultaneous measurements of frequency and energy dissipation changes caused by the formation of a beta-lactoglobulin layer during the protein adsorption process. The results showed that the protein adsorption on the spin-coated polyethersulfone surface consisted of reversible and irreversible adsorption processes, and the irreversible adsorption was the principal factor to cause the permanent protein adsorption onto the polymer surface. The amount of irreversible adsorption of beta-lactoglobulin increased significantly, from 380.5 +/- 23.2 to 745.5 +/- 29.7 ng/cm2, when the concentration of beta-lactoglobulin solution varied from 0.1% to 2.0% (w/v). The pH also played an important role in the protein adsorption. When the pH of the solution varied from 7.0 to 3.0, the amount of irreversible adsorption of beta-lactoglobulin increased from 427.1 +/- 80.7 to 741.2 +/- 135.1 ng/cm2.
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Affiliation(s)
- J T Kim
- Dept. of Food Science, Rutgers, The State Univ. of New Jersey, 65 Dudley Rd., New Brunswick, NJ 08901, USA
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43
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Freudenberg U, Behrens SH, Welzel PB, Müller M, Grimmer M, Salchert K, Taeger T, Schmidt K, Pompe W, Werner C. Electrostatic interactions modulate the conformation of collagen I. Biophys J 2007; 92:2108-19. [PMID: 17208984 PMCID: PMC1861768 DOI: 10.1529/biophysj.106.094284] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The pH- and electrolyte-dependent charging of collagen I fibrils was analyzed by streaming potential/streaming current experiments using the Microslit Electrokinetic Setup. Differential scanning calorimetry and circular dichroism spectroscopy were applied in similar electrolyte solutions to characterize the influence of electrostatic interactions on the conformational stability of the protein. The acid base behavior of collagen I was found to be strongly influenced by the ionic strength in KCl as well as in CaCl(2) solutions. An increase of the ionic strength with KCl from 10(-4) M to 10(-2) M shifts the isoelectric point (IEP) of the protein from pH 7.5 to 5.3. However, a similar increase of the ionic strength in CaCl(2) solutions shifts the IEP from 7.5 to above pH 9. Enhanced thermal stability with increasing ionic strength was observed by differential scanning calorimetry in both electrolyte systems. In line with this, circular dichroism spectroscopy results show an increase of the helicity with increasing ionic strength. Better screening of charged residues and the formation of salt bridges are assumed to cause the stabilization of collagen I with increasing ionic strength in both electrolyte systems. Preferential adsorption of hydroxide ions onto intrinsically uncharged sites in KCl solutions and calcium binding to negatively charged carboxylic acid moieties in CaCl(2) solutions are concluded to shift the IEP and influence the conformational stability of the protein.
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Affiliation(s)
- Uwe Freudenberg
- Leibniz Institute of Polymer Research Dresden, Max Bergmann Center of Biomaterials Dresden, Dresden, Germany
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44
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Alves CM, Yang Y, Carnes DL, Ong JL, Sylvia VL, Dean DD, Agrawal CM, Reis RL. Modulating bone cells response onto starch-based biomaterials by surface plasma treatment and protein adsorption. Biomaterials 2007; 28:307-15. [PMID: 17011619 DOI: 10.1016/j.biomaterials.2006.09.010] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2006] [Accepted: 09/04/2006] [Indexed: 10/24/2022]
Abstract
The effect of oxygen-based radio frequency glow discharge (rfGD) on the surface of different starch-based biomaterials (SBB) and the influence of proteins adsorption on modulating bone-cells behavior was studied. Bovine serum albumin, fibronectin and vitronectin were used in single and complex protein systems. RfGD-treated surfaces showed to increase in hydrophilicity and surface energy when compared to non-modified SBB. Biodegradable polymeric blends of cornstarch with cellulose acetate (SCA; 50/50wt%), ethylene vinyl alcohol (SEVA-C; 50/50wt%) and polycaprolactone (SPCL; 30/70wt%) were studied. SCA and SCA reinforced with 10% hydroxyapatite (HA) showed the highest degree of modification as result of the rfGD treatment. Protein and control solutions were used to incubate with the characterized SBB and, following this, MG63 osteoblast-like osteosarcoma cells were seeded over the surfaces. Cell adhesion and proliferation onto SCA was found to be enhanced for non-treated surfaces and on SCA+10%HA no alteration was brought up by the plasma modification. Onto SCA surfaces, BSA, FN and VN single solutions improved cell adhesion, and this same effect was found upscaled for ternary systems. In addition, plasma treated SEVA-C directed an increase in both adhesion and proliferation comparing to non-treated surfaces. Even though adhesion onto treated and untreated SPCL was quite similar, plasma modification clearly promoted MG63 cells proliferation. Regarding MG63 cells morphology it was shown that onto SEVA-C surfaces the variation of cell shape was primarily defined by the protein system, while onto SPCL it was mainly affected by the plasma treatment.
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Affiliation(s)
- Catarina M Alves
- 3B's Research Group--Biomaterials, Biodegradables and Biomimetics, Campus Gualtar, 4710-057 Braga, Portugal.
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45
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Beattie JK. The intrinsic charge on hydrophobic microfluidic substrates. LAB ON A CHIP 2006; 6:1409-11. [PMID: 17066162 DOI: 10.1039/b610537h] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
A synthesis of the literature provides an explanation for the hitherto unexplained charge on hydrophobic microfluidic substrates. It is due to the adsorption of hydroxide ions created by the enhanced autolysis of water at these surfaces.
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Affiliation(s)
- James K Beattie
- School of Chemistry, University of Sydney, Sydney, NSW 2006, Australia.
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46
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Alkafeef SF, Alajmi AF. Streaming potentials and conductivities of reservoir rock cores in aqueous and non-aqueous liquids. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2006.04.023] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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47
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Dukhin SS, Zimmermann R, Werner C. Electrokinetic fingerprinting of grafted polyelectrolyte layers--a theoretical approach. Adv Colloid Interface Sci 2006; 122:93-105. [PMID: 16901456 DOI: 10.1016/j.cis.2006.06.009] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Electrokinetic fingerprinting (EF) was introduced by Marlow and Rowell [Marlow BJ, Rowel RL. Langmuir 1990;6:1088] for the comprehensive characterization of charged particle surfaces. Afterwards, EF was applied by many groups for the characterization of "hard" (i.e. non-swelling) surfaces. However, the advantages of EF could not yet utilized for the characterization of grafted polyelectrolyte layers (PL) since the theoretical background was not yet elaborated. A theory for the characterization of PL at complete dissociation of the functional groups was developed by Ohshima [Adv Colloid Interface Sci 1995;62:189] and later extended by Dukhin et al. [Dukhin S, Zimmermann R, Werner C. J Colloid Interface Sci 2005;286:761] for any degree of dissociation. Further progress in the characterization of soft surfaces may be achieved by combining EF and surface conductivity (SC) measurements. Both theory and experiment demonstrate that integrated measurements of SC and apparent zeta potential zeta(a) in broad ranges of pH and ionic strength provide information about Donnan potential Psi(D), surface charge, pK and surface potential Psi(0), while the interpretation is more uncertain, when only zeta(a) is measured. This advanced method of PL characterization is established for PL grafted on flat surfaces. When PL are formed on spherical particles, the SC may be measured by means of conductometry and/or dielectric spectroscopy. However, the current theories can only be applied within a rather narrow range of the practically relevant conditions. To overcome this limitation, an unified approach to the theory of electrophoresis for spherical particles with grafted PL was elaborated taking into account the existence of two different electrokinetic models for soft surfaces. While one model is focused on hydrodynamic permeability of soft surface and disregards surface current, another model considers the surface current and disregards electrokinetic water transport within the soft surface layer. Unification became possible through generalization of the capillary osmosis theory over soft surfaces.
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48
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Sze A, Erickson D, Ren L, Li D. Zeta-potential measurement using the Smoluchowski equation and the slope of the current-time relationship in electroosmotic flow. J Colloid Interface Sci 2006; 261:402-10. [PMID: 16256549 DOI: 10.1016/s0021-9797(03)00142-5] [Citation(s) in RCA: 408] [Impact Index Per Article: 22.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2002] [Accepted: 01/28/2003] [Indexed: 11/17/2022]
Abstract
The zeta -potential of a solid-liquid interface is an important surface characterization quantity for applications ranging from the development of biomedical polymers to the design of microfluidic devices. This study presents a novel experimental technique to measure the zeta -potentials of flat surfaces. This method combines the Smoluchowski equation with the measured slope of current-time relationship in electroosmotic flow. This method is simple and accurate in comparison with the traditional streaming potential and electrophoresis techniques. Using this method the zeta -potentials of glass and poly(dimethylsiloxane) (PDMS) coated surfaces in KCl and LaCl3 aqueous solutions were measured using several flow channels ranging from 200 to 300 microm in height. The zeta -potential was found to vary from -88 to -66 mV for glass surface and -110 to -68 mV for PDMS surfaces depending on the electrolyte and the ionic concentration. The measured values of the zeta -potential are found to be independent of the channel size and the applied driving voltage and generally are repeatable within +/-6%.
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Affiliation(s)
- Alice Sze
- Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, Canada M5S 3G8
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49
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Adsorption of Surfactants on Polymer Surfaces Investigated with a Novel Zeta-Potential Measurement System. ACTA ACUST UNITED AC 2006. [DOI: 10.4028/www.scientific.net/msf.514-516.1374] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The determination of electrokinetic properties such as the zeta-potential of polymer
samples with classical methods is laborious and time-consuming. For this reasons, a reliable, fast,
and easy to use measurement system based on streaming potential measurement was developed. In
this novel measurement system, streaming potential is created by an oscillating flow of a small
amount of electrolyte solution through the sample media. In addition, this setup allows direct
titration and therefore time-resolved monitoring of changes in zeta-potential in a seconds timescale.
With this instrument, the concentration- as well as the time-dependent adsorption behaviour of
various non-ionic, anionic and cationic surfactants on a novel, regenerated cellulosic polymer was
investigated. This new cellulose-based, fibrous textile polymer is permanently cationised, not only
at the surface but throughout the whole fibre.
The results show that even very low concentrations of surfactant, due to its charge and chemical
composition, highly influence the surface charge of the polymer in a large range. Furthermore, the
results for this new textile material are compared with other textile fibres, e. g. wool.
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50
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Indest T, Strnad S, Kleinschek KS, Ribitsch V, Fras L. Electrokinetic properties of commercial vascular grafts. Colloids Surf A Physicochem Eng Asp 2006. [DOI: 10.1016/j.colsurfa.2005.09.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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