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Ahmad M, Ahmed M. Characterization and applications of ion-exchange membranes and selective ion transport through them: a review. J APPL ELECTROCHEM 2023. [DOI: 10.1007/s10800-023-01882-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2023]
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2
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A review on ion-exchange nanofiber membranes: properties, structure and application in electrochemical (waste)water treatment. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120529] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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3
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Mokhtari F, Azimi B, Salehi M, Hashemikia S, Danti S. Recent advances of polymer-based piezoelectric composites for biomedical applications. J Mech Behav Biomed Mater 2021; 122:104669. [PMID: 34280866 DOI: 10.1016/j.jmbbm.2021.104669] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 04/19/2021] [Accepted: 06/27/2021] [Indexed: 02/07/2023]
Abstract
Over the past decades, electronics have become central to many aspects of biomedicine and wearable device technologies as a promising personalized healthcare platform. Lead-free piezoelectric materials for converting mechanical into electrical energy through piezoelectric transduction are of significant value in a diverse range of technological applications. Organic piezoelectric biomaterials have attracted widespread attention as the functional materials in the biomedical devices due to their advantages of excellent biocompatibility. They include synthetic and biological polymers. Many biopolymers have been discovered to possess piezoelectricity in an appreciable amount, however their investigation is still preliminary. Due to their piezoelectric properties, better known synthetic fluorinated polymers have been intensively investigated and applied in biomedical applications including controlled drug delivery systems, tissue engineering, microfluidic and artificial muscle actuators, among others. Piezoelectric polymers, especially poly (vinylidene fluoride) (PVDF) and its copolymers are increasingly receiving interest as smart biomaterials due to their ability to convert physiological movements to electrical signals when in a controllable and reproducible manner. Despite possessing the greatest piezoelectric coefficients among all piezoelectric polymers, it is often desirable to increase the electrical outputs. The most promising routes toward significant improvements in the piezoelectric response and energy-harvesting performance of such materials is loading them with various inorganic nanofillers and/or applying some modification during the fabrication process. This paper offers a comprehensive review of the principles, properties, and applications of organic piezoelectric biomaterials (polymers and polymer/ceramic composites) with special attention on PVDF-based polymers and their composites in sensors, drug delivery and tissue engineering. Subsequently focuses on the most common fabrication routes to produce piezoelectric scaffolds, tissue and sensors which is electrospinning process. Promising upcoming strategies and new piezoelectric materials and fabrication techniques for these applications are presented to enable a future integration among these applications.
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Affiliation(s)
- Fatemeh Mokhtari
- Intelligent Polymer Research Institute, University of Wollongong, Wollongong NSW, Australia
| | - Bahareh Azimi
- Department of Civil and Industrial Engineering, University of Pisa, Pisa, Italy; Department. of Civil and Environmental Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA
| | - Maryam Salehi
- Department of Civil Engineering, The University of Memphis, Memphis, TN, USA
| | - Samaneh Hashemikia
- Faculty of Textile Engineering, Urmia University of Technology, Urmia, Iran
| | - Serena Danti
- Department of Civil and Industrial Engineering, University of Pisa, Pisa, Italy; Department. of Civil and Environmental Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA.
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A Review on Porous Polymeric Membrane Preparation. Part I: Production Techniques with Polysulfone and Poly (Vinylidene Fluoride). Polymers (Basel) 2019; 11:polym11071160. [PMID: 31288433 PMCID: PMC6680680 DOI: 10.3390/polym11071160] [Citation(s) in RCA: 128] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 06/27/2019] [Accepted: 06/27/2019] [Indexed: 12/18/2022] Open
Abstract
Porous polymeric membranes have emerged as the core technology in the field of separation. But some challenges remain for several methods used for membrane fabrication, suggesting the need for a critical review of the literature. We present here an overview on porous polymeric membrane preparation and characterization for two commonly used polymers: polysulfone and poly (vinylidene fluoride). Five different methods for membrane fabrication are introduced: non-solvent induced phase separation, vapor-induced phase separation, electrospinning, track etching and sintering. The key factors of each method are discussed, including the solvent and non-solvent system type and composition, the polymer solution composition and concentration, the processing parameters, and the ambient conditions. To evaluate these methods, a brief description on membrane characterization is given related to morphology and performance. One objective of this review is to present the basics for selecting an appropriate method and membrane fabrication systems with appropriate processing conditions to produce membranes with the desired morphology, performance and stability, as well as to select the best methods to determine these properties.
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Galiano F, Briceño K, Marino T, Molino A, Christensen KV, Figoli A. Advances in biopolymer-based membrane preparation and applications. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.07.059] [Citation(s) in RCA: 170] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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6
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Stabilized SPEEK Membranes with a High Degree of Sulfonation for Enthalpy Heat Exchangers. COATINGS 2018. [DOI: 10.3390/coatings8050190] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zhang Y, Zhang W, Cházaro-Ruiz LF. Porous PVDF/PANI ion-exchange membrane (IEM) modified by polyvinylpyrrolidone (PVP) and lithium chloride in the application of membrane capacitive deionisation (MCDI). WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 77:2311-2319. [PMID: 29757183 DOI: 10.2166/wst.2018.152] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
In this work, polyvinylidene fluoride (PVDF)/polyaniline (PANI) heterogeneous anion-exchange membranes filled with pore-forming agents polyvinylpyrrolidone (PVP) and lithium chloride were prepared by the solution-casting technique using the solvent 1-methyl-2-pyrrolidone (NMP) and a two-step phase inversion procedure. Key properties of the as-prepared membranes, such as hydrophilicity, water content, ion exchange capacity, fixed ion concentration, conductivity and transport number were examined and compared between membranes in different conditions. The pore-forming hydrophilic additives PVP and lithium chloride to the casting solution appeared to improve the ion-exchange membranes (IEMs) by increasing the conductivity, transport number and hydrophilicity. The effects of increasing membrane drying time on the porosity of the as-prepared membranes were found to lower membrane porosity by reducing membrane water content. However, pore-forming agents were found to be able to stabilise membrane transport number with different drying times. As-prepared PVDF/PANI anion-exchange membrane with pore-forming agent is demonstrated to be a more efficient candidate for water purification (e.g. desalination) and other industrial applications.
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Affiliation(s)
- Yiming Zhang
- School of Natural and Built Environments, University of South Australia, SA 5095, Australia E-mail:
| | - Wei Zhang
- School of Natural and Built Environments, University of South Australia, SA 5095, Australia E-mail: ; Systems and Process Engineering Centre, College of Engineering, Swansea University, Bay Campus, Swansea SA1 8EN, UK
| | - Luis F Cházaro-Ruiz
- División de Ciencias Ambientales, Instituto Potosino de Investigación Científica y Tecnológica, A.C., Camino a la Presa San José 2055, Lomas 4a Sección, SLP, San Luis Potosí, 78216, México C.P
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8
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pH-dependent release of antihypertensives from complexes with poly(carboxyalkyl methacrylamides). J Drug Deliv Sci Technol 2017. [DOI: 10.1016/j.jddst.2017.05.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Zlotorowicz A, Strand R, Burheim O, Wilhelmsen Ø, Kjelstrup S. The permselectivity and water transference number of ion exchange membranes in reverse electrodialysis. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2016.10.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Electrodialytic properties of aromatic and aliphatic type hydrocarbon-based anion-exchange membranes with various anion-exchange groups. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.06.072] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Preparation and characterization of nanocomposite heterogeneous cation exchange membranes modified by silver nanoparticles. KOREAN J CHEM ENG 2014. [DOI: 10.1007/s11814-014-0051-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Liu J, Detrembleur C, Debuigne A, De Pauw-Gillet MC, Mornet S, Vander Elst L, Laurent S, Labrugère C, Duguet E, Jérôme C. Poly(acrylic acid)-block-poly(vinyl alcohol) anchored maghemite nanoparticles designed for multi-stimuli triggered drug release. NANOSCALE 2013; 5:11464-11477. [PMID: 24091428 DOI: 10.1039/c3nr02861e] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Original core/corona nanoparticles composed of a maghemite core and a stimuli-responsive polymer coating made of poly(acrylic acid)-block-poly(vinyl alcohol) macromolecules were fabricated for drug delivery system (DDS) application. This kind of DDS aims to combine the advantage of stimuli-responsive polymer coating, in order to regulate the drug release behaviours under different conditions and furthermore, improve the biocompatibility and in vivo circulation half-time of the maghemite nanoparticles. Drug loading capacity was evaluated with methylene blue (MB), a cationic model drug. The triggered release of MB was studied under various stimuli such as pH, ionic strength and temperature. Local heating generated under alternating magnetic field (AMF) application was studied, and remotely AMF-triggered release was also confirmed, while a mild heating-up of the release medium was observed. Furthermore, their potential application as magnetic resonance imaging (MRI) contrast agents was explored via relaxivity measurements and acquisition of T2-weighted images. Preliminary studies on the cytotoxicity against mouse fibroblast-like L929 cell line and also their cellular uptake within human melanoma MEL-5 cell line were carried out. In conclusion, this kind of stimuli-responsive nanoparticles appears to be promising carriers for delivering drugs to some tumour sites or into cellular compartments with an acidic environment.
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Affiliation(s)
- Ji Liu
- Center for Education and Research on Macromolecules (CERM), University of Liège, B6a Sart-Tilman, B-4000 Liège, Belgium.
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Wagner D, Pasko D, Phillips K, Waldvogel J, Annich G. In vitro clearance of dexmedetomidine in extracorporeal membrane oxygenation. Perfusion 2012; 28:40-6. [DOI: 10.1177/0267659112456894] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Dexmedetomidine (DMET) is a useful agent for sedation, both alone and in combination with other agents, in critically ill patients, including those on extracorporeal membrane oxygenation (ECMO) therapy. The drug is a clonidine-like derivative with an 8-fold greater specificity for the alpha 2-receptor while maintaining respiratory and cardiovascular stability. An in vitro ECMO circuit was used to study the effects of both “new” and “old” membrane oxygenators on the clearance of dexmedetomidine over the course of 24 hours. Once primed, the circuit was dosed with 840 μg of dexmedetomidine for a final concentration of 0.9 μg/ml. Serial samples, both pre- and post-oxygenator, were taken at 5, 60, 360, and 1440 minutes. Concentrations of the drug were expressed as a percentage of the original concentration remaining at each time point, both for new and old circuits. The new circuits were run at a standard flow for 24 hours, after which time the circuit was considered old and re-dosed with dexmedetomidine and the trial repeated. Results show that dexmedetomidine losses occur early in the circuits and then continue to decline. Initial losses in the first hour were 11+-65% and 59-73% pre- and post-oxygenator in the new circuit and 36-50% and 42-72% in the old circuit. The clearance of the drug through the membrane oxygenator exhibits no statistical difference between pre and post or new and old circuits. Dexmedetomidine can be expected to exhibit concentration changes during ECMO therapy. This effect appears to be more related to adsorption to the polyvinyl chloride (PVC) tubing rather than the membrane oxygenator. Dosage adjustments during dexmedetomidine administration during ECMO therapy may be warranted in order to maintain adequate serum concentrations and, hence, the desired degree of sedation.*(Lack of equilibrium)
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Affiliation(s)
- D Wagner
- Pharmacy/Anesthesiology, University of Michigan Hospitals and Health Systems, Ann Arbor, MI, USA
| | - D Pasko
- C&W Administration, University of Michigan Hospitals and Health Centers, Ann Arbor, MI, USA
| | - K Phillips
- Geriatric Research Education and Clinical Center, VA Ann Arbor Healthcare System, Ann Arbor, MI, USA
| | - J Waldvogel
- Extracorporeal Life Support, University of Michigan Hospitals and Health Centers, Ann Arbor, MI, USA
| | - G Annich
- Pediatric Critical Care Medicine, University of Michigan Hospitals and Health Centers, Ann Arbor, MI, USA
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Preparation of aliphatic-hydrocarbon-based anion-exchange membranes and their anti-organic-fouling properties. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2011.08.064] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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15
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Alizadeh M, Abbasi F, Farahi M, Jalili K. Silicone-based hydrogels prepared by interpenetrating polymer network synthesis: Swelling properties and confinements effects on the formation kinetics. J Appl Polym Sci 2011. [DOI: 10.1002/app.35133] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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16
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Investigation of electrochemical and morphological properties of S-PVC based heterogeneous cation-exchange membranes modified by sodium dodecyl sulphate. Sep Purif Technol 2011. [DOI: 10.1016/j.seppur.2010.12.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Cornejo-Bravo JM, Partida-Soria Y, Serrano-Medina A, Espinoza-Dueñas K, Ramos MA, Licea-Claverie A. Hydrophobic weak acid polymers as controlled release carriers. Pharm Dev Technol 2010; 17:170-6. [DOI: 10.3109/10837450.2010.529147] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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18
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Karppi J, Åkerman S, Åkerman K, Sundell A, Penttilä I. Adsorption of metal cations from aqueous solutions onto the pH responsive poly(vinylidene fluoride grafted poly(acrylic acid) (PVDF-PAA) membrane. JOURNAL OF POLYMER RESEARCH 2009. [DOI: 10.1007/s10965-009-9291-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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19
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Xue J, Chen L, Wang HL, Zhang ZB, Zhu XL, Kang ET, Neoh KG. Stimuli-responsive multifunctional membranes of controllable morphology from poly(vinylidene fluoride)-graft-poly[2-(N,N-dimethylamino)ethyl methacrylate] prepared via atom transfer radical polymerization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:14151-8. [PMID: 19360962 DOI: 10.1021/la801402u] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Poly(vinylidene fluoride) (PVDF) with poly[2-(N,N-dimethylamino) ethyl methacrylate] (PDMAEMA) side chains were synthesized via vinylidene fluoride-initiated atom transfer radical polymerization (ATRP) of 2-(N,N-dimethylamino) ethyl methacrylate (DMAEMA). The graft copolymer can be readily cast into porous pH- and thermo-responsive microfiltration (MF) membranes with enriched "living" PDMAEMA graft chains on the surface (including the pore surfaces) by phase inversion in an aqueous medium. The morphology and surface composition of the membranes were characterized by scanning electron microscopy and X-ray photoelectron spectroscopy, respectively. The pH and temperature of the aqueous media for phase inversion and the PDMAEMA content in the PVDF-g-PDMAEMA copolymers can be used to adjust the pore size of the membranes. In addition to having pH and temperature-responsive permeability, the PVDF-g-PDMAEMA MF membranes also exhibit both good antifouling and antibacterial properties, making the membrane potentially useful for biorelated applications. Furthermore, the dormant PDMAEMA chain ends on the PVDF-g-PDMAEMA membrane can be reactivated for the consecutive surface-initiated ATRP of other functional monomers, such as 2-naphthyl methacrylate (2NM), to produce fluorescent PDMAEMA-b-P2NM diblock copolymer brushes on the PVDF membrane.
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Affiliation(s)
- J Xue
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, China, 510640
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Abdekhodaie MJ, Wu XY. Drug release from ion-exchange microspheres: Mathematical modeling and experimental verification. Biomaterials 2008; 29:1654-63. [DOI: 10.1016/j.biomaterials.2007.11.044] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2007] [Accepted: 11/27/2007] [Indexed: 11/26/2022]
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21
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Karppi J, Åkerman S, Åkerman K, Sundell A, Nyyssönen K, Penttilä I. Erratum to “Isolation of drugs from biological fluids by using pH sensitive poly(acrylic acid) grafted poly(vinylidene fluoride) polymer membrane in vitro”. Eur J Pharm Biopharm 2008. [DOI: 10.1016/j.ejpb.2007.11.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Peng Q, Lu S, Chen D, Wu X, Fan P, Zhong R, Xu Y. Poly(vinylidene fluoride)-graft-poly(N-vinyl-2-pyrrolidone) copolymers prepared via a RAFT-mediated process and their use in antifouling and antibacterial membranes. Macromol Biosci 2008; 7:1149-59. [PMID: 17705155 DOI: 10.1002/mabi.200700068] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
PNVP-g-PVDF copolymers were synthesized and used to produce microfiltration membranes. The pore size and distribution varied with the grafting concentration and the density of graft points. A significant decrease of the amounts of adsorbed BSA indicated improved antifouling properties of PVDF. The MF membranes were further functionalized via surface-initiated block copolymerization with DMAEMA to obtain (PVDF-g-PNVP)-b-PDMAEMA MF membranes. Quaternization of the tertiary amine groups of the PDMAEMA brushes gave rise to a high concentration of quaternary ammonium salt on the membrane surfaces. The bactericidal effect of the QAS-functionalized membranes on E. coli was also demonstrated and discussed.
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Affiliation(s)
- Qiang Peng
- Department of Environmental and Chemical Engineering, Nanchang Institute of Aeronautical Technology, Nanchang 330034, China.
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Karppi J, Akerman S, Akerman K, Sundell A, Nyyssönen K, Penttilä I. Isolation of drugs from biological fluids by using pH sensitive poly(acrylic acid) grafted poly(vinylidene fluoride) polymer membrane in vitro. Eur J Pharm Biopharm 2007; 67:562-8. [PMID: 17475455 DOI: 10.1016/j.ejpb.2007.03.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2007] [Revised: 03/16/2007] [Accepted: 03/16/2007] [Indexed: 11/23/2022]
Abstract
Isolation of acidic and basic model drugs by using pH sensitive poly(acrylic acid) grafted poly(vinylidene fluoride) (PAA-PVDF) cation-exchange membrane from biological fluids was reported. Effects of drug charge and lipophilicity on adsorption were also investigated. In the present study, basic model drugs adsorbed to a considerably greater extent onto the membrane than acidic drugs. Albumin was not adsorbed onto the membrane. Results of our study exposed, that electrostatic interactions between positively charged basic drug and negatively charged PVDF-PAA membrane were the most important factor affecting drug adsorption onto the membrane. Adsorption of acidic and basic drugs onto the PVDF-PAA membrane was not related to drug lipophilicity. The results of present study demonstrated that basic drugs adsorbed extensively onto the membrane, but albumin did not, proposing that PAA-PVDF membrane may be suitable for isolating basic drugs from proteinaceous biological fluids (i.e. serum) for subsequent monitoring and evaluation.
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Affiliation(s)
- Jouni Karppi
- Laboratory Centre, Kuopio University Hospital, Kuopio, Finland.
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ZHANG L, XU T, LIN Z. Controlled release of ionic drug through the positively charged temperature-responsive membranes. J Memb Sci 2006. [DOI: 10.1016/j.memsci.2006.04.018] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Zhai G, Shi ZL, Kang ET, Neoh KG. Surface-initiated atom transfer radical polymerization on poly(vinylidene fluoride) membrane for antibacterial ability. Macromol Biosci 2005; 5:974-82. [PMID: 16208631 DOI: 10.1002/mabi.200500079] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Surface-active microporous membranes were prepared from the poly(vinylidene fluoride)-graft-poly(2-(2-bromoisobutyryloxy)ethyl acrylate) copolymer (PVDF-g-PBIEA copolymer) by phase inversion in water. The PBIEA side chains could function as initiators for the atom transfer radical polymerization (ATRP) of 2-(N,N-dimethylamino)ethyl methacrylate on the membrane surfaces to give rise to the PVDF-g-PBIEA-ar-PDMAEMA membranes. N-alkylation with hexyl bromide and nitromethane gave rise to the quanternized PVDF-g-PBIEA-ar-QPDMAEMA membranes with polycation chains chemically tethered on the membrane surface, including the pore surfaces. The changes in the surface morphology and the surface chemical composition were confirmed by scanning electron microscopy and X-ray photoelectron spectroscopy. The scanning electron microscopy revealed that, in comparison to the pristine PVDF-g-PBIEA membranes, not only could the PVDF-g-PBIEA-ar-QPDMAEMA membranes remove the Gram-negative bacterium Escherichia coli but also inhibited the bacterial reproduction on the membranes to a significant extent.
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Affiliation(s)
- Guangqun Zhai
- Department of Materials Science and Engineering, Jiangsu Polytechnic University, Changzhou 213016, People's Republic of China.
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Cornejo-Bravo JM, Flores-Guillen ME, Lugo-Medina E, Licea-Claverie A. Drug release from complexes with a series of poly(carboxyalkyl methacrylates), a new class of weak polyelectrolytes. Int J Pharm 2005; 305:52-60. [PMID: 16226001 DOI: 10.1016/j.ijpharm.2005.08.023] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2005] [Revised: 08/22/2005] [Accepted: 08/22/2005] [Indexed: 10/25/2022]
Abstract
Carboxyalkyl methacrylates, a new class of non-cross-linked, hydrophobic weak polyelectrolytes, were synthesized, and then bound to cationic drugs (propranolol.HCl, diltiazem.HCl and verapamil.HCl) to form water-insoluble complexes that release the bound drug only in ionic media (pH 7.4). Compressed tablets were prepared from these cation exchange polyelectrolytes. Release profiles followed zero order kinetics (n>0.90; n is the release exponent). As the hydrophobicity of the polyelectrolytes increased, the rate of release decreased and deviated from linearity (n=0.7). Both the ionic strength of the medium as well as the solubility of the drug affected the rate of release. In acidic media (pH 1.2) a burst of drug was released but the release was halted by a layer of non-ionized polymer precipitated on the surface of the tablets. The results indicate that it is possible to "tailor-make" the release kinetics by using a polyelectrolyte from the series with the suitable hydrophobicity.
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Affiliation(s)
- Jose M Cornejo-Bravo
- Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma de Baja California, PMB 121, 2498 Roll Dr, San Diego, CA 92154, USA.
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Hänninen KR, Kaukonen AM, Murtomäki LS, Hirvonen JT. Effect of ion-exchange fiber structure on the binding and release of model salicylates. J Pharm Sci 2005; 94:1772-81. [PMID: 15986469 DOI: 10.1002/jps.20396] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Salicylates were used as model anions to evaluate the effect of the structure (framework and ion-exchange groups) of fibrous anion-exchangers on the extent and mechanism(s) of compound binding and release. Binding was affected by the physicochemical properties of both the salicylates and the ion-exchange fibers. The highest molar amount of binding was obtained with the most lipophilic salicylate (5-chlorosalicylic acid) and the weak base (vinylpyridine) anion-exchange fibers. However, when the ion-exchange capacity was taken into account, higher binding was obtained in fibers of poly(ethylene) framework compared to the viscose-based fibers. The extent of salicylate release into NaCl solution(s) was dependent on the physicochemical characteristics of both the fiber and the bound model salicylate as well as on the amount of extracting ions. With strong base fibers (trimethylammonium), the viscose framework released the salicylates more efficiently than the poly(ethylene) framework. In the case of weak base fibers, the poly(ethylene) framework released the salicylates to a higher extent than the viscose framework. Calculated equilibrium constants (K) of the ion-exchange reactions illustrated that in addition to electrostatic interactions (pure ion-exchange mechanism), non-electrostatic interactions (hydrophobic interactions and/or hydrogen bonding) were also involved. However, the release of the salicylates was efficiently modified by the amount of extracting electrolyte, demonstrating that ion-exchange was the prevalent release mechanism.
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Affiliation(s)
- Kaisa R Hänninen
- Division of Pharmaceutical Technology, and Drug Discovery and Development Technology Center, Faculty of Pharmacy, University of Helsinki, P.O. Box 56, FIN-00014 Helsinki, Finland.
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Zhai G, Kang ET, Neoh KG. Inimer Graft-Copolymerized Poly(vinylidene fluoride) for the Preparation of Arborescent Copolymers and “Surface-Active” Copolymer Membranes. Macromolecules 2004. [DOI: 10.1021/ma048894l] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Guangqun Zhai
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260
| | - E. T. Kang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260
| | - K. G. Neoh
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260
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Lee WF, Fu YT. Effect of montmorillonite on the swelling behavior and drug-release behavior of nanocomposite hydrogels. J Appl Polym Sci 2003. [DOI: 10.1002/app.12624] [Citation(s) in RCA: 154] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Vasconcelos CD, Rocha A, Pereira M, Fonseca J. Electrolyte diffusion in a chitosan membrane. POLYM INT 2001. [DOI: 10.1002/pi.627] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Tarvainen T, Nevalainen T, Sundell A, Svarfvar B, Hyrsylä J, Paronen P, Järvinen K. Drug release from poly(acrylic acid) grafted poly(vinylidene fluoride) membrane bags in the gastrointestinal tract in the rat and dog. J Control Release 2000; 66:19-26. [PMID: 10708875 DOI: 10.1016/s0168-3659(99)00254-0] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Stomach-specific drug delivery systems would be of value in treating diseases of the upper gastrointestinal tract. The present study measured in vitro and in vivo drug release from pH-sensitive membrane bags, constructed of poly(acrylic acid) grafted onto a poly(vinylidene fluoride) (PAA-PVDF) membrane, which might be suitable for stomach-specific drug delivery. The used model drugs were propranolol-HCl (1.0 mg) and FITC-dextran MW 4400 (1.0 mg). Drug release in vivo was studied by inserting membrane bags into the stomach and proximal duodenum of anesthetized rats and dogs. At 30 and 180 min, the bags were removed from the lumens and residual drug content was determined. The release of either propranolol or FITC-dextran were comparable in both stomach and duodenum, showing that in vivo drug release did not depend on environmental pH. In vitro results suggested that these results could be explained by interactions between PAA and the mucous layers of the stomach and duodenum.
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Affiliation(s)
- T Tarvainen
- Department of Pharmaceutics, University of Kuopio, PO Box 1627, 70211, Kuopio, Finland.
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