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Modification and acidification of polysulfone as effective strategies to enhance adsorptive ability of chromium (
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) and separation properties of ultrafiltration membrane. J Appl Polym Sci 2022. [DOI: 10.1002/app.52127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Abstract
PURPOSE OF REVIEW Improvement in hemodialysis treatment and membrane technology are focused on two aims: the first one is to achieve a better control of circulating uremic solutes by enhancing removal capacity and by broadening molecular weight spectrum of solutes cleared; the second one is to prevent inflammation by improving hemocompatibility of the global dialysis system. RECENT FINDINGS Despite impressive progresses in polymers chemistry few hazards are still remaining associated with leaching or sensitization to polymer additives. Research has focused on developing more stable polymers by means of additives or processes aiming to minimize such risks. Membrane engineering manufacturing with support of nanocontrolled spinning technology has opened up membrane to middle and large molecular weight substances, while preserving albumin losses. Combination of diffusive and enhanced convective fluxes in the same hemodialyzer module, namely hemodiafiltration, provides today the highest solute removal capacity over a broad spectrum of solutes. SUMMARY Dialysis membrane is a crucial component of the hemodialysis system to optimize solute removal efficacy and to minimize blood membrane biological reactions. Hemodialyzer is much more than a membrane. Dialysis membrane and hemodialyzer choice are parts of a treatment chain that should be operated in optimized conditions and adjusted to patient needs and tolerance, to improve patient outcomes.
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Affiliation(s)
- Bernard Canaud
- Global Medical Office, FMC Deutschland, Bad Homburg, Germany
- University of Montpellier, UFR of Medicine, Montpellier, France
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Towards the synthesis of greener membranes: Interest of PVA as porous support for membrane application in gas and liquid separations. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.118357] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Cornejo-Bravo JM, Palomino K, Palomino-Vizcaino G, Pérez-Landeros OM, Curiel-Alvarez M, Valdez-Salas B, Bucio E, Magaña H. Poly( N-vinylcaprolactam) and Salicylic Acid Polymeric Prodrug Grafted onto Medical Silicone to Obtain a Novel Thermo- and pH-Responsive Drug Delivery System for Potential Medical Devices. MATERIALS 2021; 14:ma14051065. [PMID: 33668741 PMCID: PMC7956192 DOI: 10.3390/ma14051065] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 02/19/2021] [Accepted: 02/22/2021] [Indexed: 12/14/2022]
Abstract
New medical devices with anti-inflammatory properties are critical to prevent inflammatory processes and infections in medical/surgical procedures. In this work, we present a novel functionalization of silicone for medical use with a polymeric prodrug and a thermosensitive polymer, by graft polymerization (gamma rays), for the localized release of salicylic acid, an analgesic, and anti-inflammatory drug. Silicone rubber (SR) films were functionalized in two stages using graft polymerization from ionizing radiation (60Co). The first stage was grafting poly(N-vinylcaprolactam) (PNVCL), a thermo-sensitive polymer, onto SR to obtain SR-g-PNVCL. In the second stage, poly(2-methacryloyloxy-benzoic acid) (P2MBA), a polymeric prodrug, was grafted to obtain (SR-g-PNVCL)-g-P2MBA. The degree of functionalization depended on the concentrations of monomers and the irradiation dose. The films were characterized by attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR), scanning electron microscopy/energy-dispersive X-ray spectrometry (SEM–EDX), thermogravimetric analysis (TGA), and contact angle. An upper critical solution temperature (UCST) of the films was demonstrated by the swelling degree as a temperature function. (SR-g-PNVCL)-g-P2MBA films demonstrated hydrolysis-mediated drug release from the polymeric prodrug, pH, and temperature sensitivity. GC–MS confirmed the presence of the drug (salicylic acid), after polymer hydrolysis. The concentration of the drug in the release media was quantified by HPLC. Cytocompatibility and thermo-/pH sensitivity of functionalized medical silicone were demonstrated in cancer and non-cancer cells.
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Affiliation(s)
- José M. Cornejo-Bravo
- Faculty of Chemical Sciences and Engineering, Autonomous University of Baja California, University Boulevard No. 14418, Otay Mesa, Tijuana 22390, Mexico; (J.M.C.-B.); (K.P.)
| | - Kenia Palomino
- Faculty of Chemical Sciences and Engineering, Autonomous University of Baja California, University Boulevard No. 14418, Otay Mesa, Tijuana 22390, Mexico; (J.M.C.-B.); (K.P.)
| | - Giovanni Palomino-Vizcaino
- Faculty of Health Sciences, Autonomous University of Baja California, University Boulevard No. 1000, Tijuana 22260, Mexico;
| | - Oscar M. Pérez-Landeros
- Institute of Engineering, Autonomous University of Baja California, Benito Juárez Boulevard, Mexicali 21280, Mexico; (O.M.P.-L.); (M.C.-A.); (B.V.-S.)
| | - Mario Curiel-Alvarez
- Institute of Engineering, Autonomous University of Baja California, Benito Juárez Boulevard, Mexicali 21280, Mexico; (O.M.P.-L.); (M.C.-A.); (B.V.-S.)
| | - Benjamín Valdez-Salas
- Institute of Engineering, Autonomous University of Baja California, Benito Juárez Boulevard, Mexicali 21280, Mexico; (O.M.P.-L.); (M.C.-A.); (B.V.-S.)
| | - Emilio Bucio
- Department of Radiation Chemistry and Radiochemistry, Institute of Nuclear Science, National Autonomous University of Mexico, Mexico City 04510, Mexico;
| | - Héctor Magaña
- Faculty of Chemical Sciences and Engineering, Autonomous University of Baja California, University Boulevard No. 14418, Otay Mesa, Tijuana 22390, Mexico; (J.M.C.-B.); (K.P.)
- Correspondence:
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