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Kelsall KN, Foroughi LM, Frank DS, Schenck L, LaBuda A, Matzger AJ. Structural Modifications of Polyethylenimine to Control Drug Loading and Release Characteristics of Amorphous Solid Dispersions. Mol Pharm 2023; 20:1779-1787. [PMID: 36719910 DOI: 10.1021/acs.molpharmaceut.2c00970] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Crystalline drugs with low solubility have the potential to benefit from delivery in the amorphous form. The polymers used in amorphous solid dispersions (ASDs) influence their maximum drug loading, solubility, dissolution rate, and physical stability. Herein, the influence of hydrophobicity of crosslinked polyethylenimine (PEI) is investigated for the delivery of the BCS class II nonsteroidal anti-inflammatory drug flufenamic acid (ffa). Several synthetic variables for crosslinking PEI with terephthaloyl chloride were manipulated: solvent, crosslinking density, reactant concentration, solution viscosity, reaction temperature, and molecular weight of the hyperbranched polymer. Benzoyl chloride was employed to cap amine groups to increase the hydrophobicity of the crosslinked materials. Amorphous deprotonated ffa was present in all ASDs; however, the increased hydrophobicity and reduced basicity from benzoyl functionalization led to a combination of amorphous deprotonated ffa and amorphous neutral ffa in the materials at high drug loadings (50 and 60 wt %). All ASDs demonstrated enhanced drug delivery in acidic media compared to crystalline ffa. Physical stability testing showed no evidence of crystallization after 29 weeks under various relative humidity conditions. These findings motivate the broadening of polymer classes employed in ASD formation to include polymers with very high functional group concentrations to enable loadings not readily achieved with existing polymers.
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Affiliation(s)
- Kristen N Kelsall
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States.,Macromolecular Science and Engineering Program, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Leila M Foroughi
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Derek S Frank
- Particle Engineering Lab, Process Research & Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Luke Schenck
- Particle Engineering Lab, Process Research & Development, Merck & Co., Inc., Rahway, New Jersey 07065, United States
| | - Anthony LaBuda
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Adam J Matzger
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States.,Macromolecular Science and Engineering Program, University of Michigan, Ann Arbor, Michigan 48109, United States
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2
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Hurst J, Rickmann A, Heider N, Hohenadl C, Reither C, Schatz A, Schnichels S, Januschowski K, Spitzer MS. Long-Term Biocompatibility of a Highly Viscously Thiol-Modified Cross-Linked Hyaluronate as a Novel Vitreous Body Substitute. Front Pharmacol 2022; 13:817353. [PMID: 35308238 PMCID: PMC8924550 DOI: 10.3389/fphar.2022.817353] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 01/17/2022] [Indexed: 01/23/2023] Open
Abstract
Purpose: In surgical ophthalmology, the treatment of complicated retinal and vitreous diseases is one of the central challenges. For this purpose, the vitreous body is removed as part of the standard therapy and replaced by a temporary tamponade to stabilize the position of the retina. Since the tamponading properties of previous materials such as silicone oils, gases, or semi-fluorinated alkanes are a combination of their surface tension and their buoyancy vector, they cannot completely fill the vitreous cavity. The aim of this work was to test in vivo a novel vitreous body substitute (ViBos strong) based on cross-linked hyaluronic acid for its compatibility. Methods: A pars plana vitrectomy with posterior vitreous detachment was performed in the right eye of 18 pigmented rabbits, with subsequent injection of ViBos strong. Follow-up examination included slit-lamp examination, funduscopy, intraocular pressure measurements (IOP), optical coherence tomography (OCT), and electroretinogram (ERG) measurements. The rabbits were sacrificed at three different time points (1, 3, and 6 months; each 6 animals) and examined macroscopically and prepared for histological examination (HE staining) and immunohistochemistry (Brn3a and glial fibrillary acidic protein (GFAP)). Results: ViBos strong demonstrated good intraoperative handling and remained stable for at least 1 month and degraded slowly over 6 months. IOP was within clinical acceptable values at all follow-up examinations. Retinal function was well preserved after instillation of the hydrogel and comparable to the untreated eye after 6 months in OCT, ERG, and histological examinations. An increase in the GFAP expression was found in the surgery eyes, with a peak in the 3-month group. The Brn3a expression was not significantly affected by vitrectomy with ViBos strong. Conclusion: Highly viscously thiol-modified cross-linked hyaluronate showed a good biocompatibility in rabbit eyes over 6 months after vitrectomy, making it a promising potential as a vitreous substitute.
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Affiliation(s)
- Jose Hurst
- Centre of Ophthalmology, University Eye Hospital Tübingen, Tübingen, Germany
| | | | - Nele Heider
- Centre of Ophthalmology, University Eye Hospital Tübingen, Tübingen, Germany
| | | | | | - Andreas Schatz
- Centre of Ophthalmology, University Eye Hospital Tübingen, Tübingen, Germany
| | - Sven Schnichels
- Centre of Ophthalmology, University Eye Hospital Tübingen, Tübingen, Germany
| | - Kai Januschowski
- Centre of Ophthalmology, University Eye Hospital Tübingen, Tübingen, Germany.,Mount St. Peter Eye Clinic Trier, Trier, Germany
| | - Martin S Spitzer
- Centre of Ophthalmology, University Eye Hospital Tübingen, Tübingen, Germany.,Department of Ophthalmology, University Medical Center Hamburg-Eppendorf (UKE), Hamburg, Germany
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Gao Y, Zhao H, Chen G, Peng Q, Liu Y, Song F, Liu Q. Influence of Pentaerythritol Tetraacrylate Crosslinker on Polycarboxylate Superplasticizer Performance in Cementitious System. Materials (Basel) 2022; 15:1524. [PMID: 35208064 DOI: 10.3390/ma15041524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 02/12/2022] [Accepted: 02/15/2022] [Indexed: 12/01/2022]
Abstract
In this work, a crosslinked polycarboxylate superplasticizer (crosslinked-PC) was synthesized via the free radical polymerization reaction. Pentaerythritol tetraacrylate (PETA) was used as the crosslinked agent. A comparative comb-like polycarboxylate superplasticizer (comb-like-PC) was prepared under the same reaction conditions. The dispersion retention capacity, dispersion capability, hydration characteristics of the cement paste and setting time were investigated in detail. At the dosage of 0.6% bwoc, the fluidity of the cement/crosslinked-PC paste was about 340 mm, which was 40~50 mm larger than the cement/comb-like-PC paste. The dispersion retention capacity of the cement/crosslinked-PC paste was observed to be much superior due to higher adsorbed amounts on the cement particles. Moreover, the cement/crosslinked-PC paste exhibited the initial and final setting durations of 196 and 356 min, respectively, which indicated an enhancement of 18 and 68 min compared to the cement/comb-like paste. The crosslinked copolymers exhibit a stronger retardation effect than the comb-like copolymers due to their enhanced adsorbed amounts and stronger steric hindrance effect. This is further illustrated by the characterization of the hydration process and hydration products. It can be concluded that it is feasible to improve the dispersive capacity and the dispersion retention capacity of PC by changing the molecule structure from comb-like to slightly crosslinked.
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Franco E, Dussán R, Navia DP, Amú M. Study of the Annealing Effect of Starch/Polyvinyl Alcohol Films Crosslinked with Glutaraldehyde. Gels 2021; 7:gels7040249. [PMID: 34940309 PMCID: PMC8700802 DOI: 10.3390/gels7040249] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/16/2021] [Accepted: 12/01/2021] [Indexed: 11/16/2022] Open
Abstract
Films were fabricated using a mixture of polyvinyl alcohol (PVA)/cassava starch and incorporated citric acid in a concentration range between 5% and 40%. The films were annealed through thermal treatment in a temperature range between 30 °C and 90 °C with 0.3% glutaraldehyde incorporated as the crosslinking agent. This study presents the results of an experimental design analyzed using the response surface methodology. The multiple regression analysis allowed us to obtain the second-order models, which relate the annealing factors and citric acid concentration to Maximum Tensile Strength (MTS), Young’s Modulus (YM), and the Maximum Elongation at Break (MEB). The optimization and validation of the obtained model were carried out with error values below 10.08% for all the response variables, indicating that the response surface methodology and optimization were correct. Finally, as a complementary analysis, the differential scanning calorimetry (DSC) and Fourier-transform infrared spectroscopy (FTIR) tests were carried out, which revealed a higher packaging of the heat-treated films and verified their crosslinking.
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Affiliation(s)
- Edgar Franco
- Grupo de Investigación Arquitectura, Urbanismo y Estética, Facultad de Arquitectura, Arte y Diseño, Universidad de San Buenaventura, Cali 760031, Colombia;
- Correspondence: ; Tel.: +57-317-760-4613
| | - Rosmery Dussán
- Grupo de Investigación Arquitectura, Urbanismo y Estética, Facultad de Arquitectura, Arte y Diseño, Universidad de San Buenaventura, Cali 760031, Colombia;
| | - Diana Paola Navia
- Grupo de Investigación Biotecnología, Facultad de Ingeniería, Universidad de San Buenaventura, Cali 760031, Colombia; (D.P.N.); (M.A.)
| | - Maribel Amú
- Grupo de Investigación Biotecnología, Facultad de Ingeniería, Universidad de San Buenaventura, Cali 760031, Colombia; (D.P.N.); (M.A.)
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Abstract
The bilayer nanofibrous membrane fabricated via electrospinning technique can be considered as an ideal structure for the treatment of chronic skin diseases and exudative wound dressings. Wound exudate would affect healing and increases the likelihood of infection at the same time. Therefore, it is essential to produce a kind of wound dressing with relatively high hygroscopicity which could absorb wound exudate and provide a relatively dry healing environment. Bilayer nanofibrous membranes of poly(L-lactide-co-ε-caprolactone)/tetracycline hydrochloride- polyethylene oxide/sodium alginate-zinc oxide (PLCL/TCH-PEO/SA-ZnO) with drug delivery potential were prepared by electrospinning for wound healing. Then, a cross-linking which involved soaking the samples in an aqueous solution containing strontium ions for 4 h was conducted. SEM images showed that membranes still maintained the peculiar nanofibrous structure. The spinning aid (PEO) used was removed in the cross-linked alginate without affecting the PLCL/TCH outer layer gave the membrane good mechanical properties and manageability. The hydrophilicity of the mats was tested to evaluate the ability of the bilayer membrane to absorb exudate from the wound. In vitro drug release suggested that antibacterial agents TCH could release continuously more than 10 days. The cross-linked fibrous membrane has improved mechanical properties and fluid repellency, thus representing a barrier to the external environment and effective wound protection. Consequently, the bilayer fibrous scaffold with good hygroscopicity and drug release properties would have wide applications prospects for the treatment of chronic skin diseases and exudative wound dressings.
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Affiliation(s)
- Yifan Huang
- School of Textiles and Fashion, Shanghai University of Engineering Science, Shanghai, China
| | - Lei Wang
- School of Textiles and Fashion, Shanghai University of Engineering Science, Shanghai, China
| | - Yi Liu
- School of Textiles and Fashion, Shanghai University of Engineering Science, Shanghai, China
| | - Tingxiao Li
- School of Textiles and Fashion, Shanghai University of Engineering Science, Shanghai, China
| | - Binjie Xin
- School of Textiles and Fashion, Shanghai University of Engineering Science, Shanghai, China
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Shoukat H, Buksh K, Noreen S, Pervaiz F, Maqbool I. Hydrogels as potential drug-delivery systems: network design and applications. Ther Deliv 2021; 12:375-96. [PMID: 33792360 DOI: 10.4155/tde-2020-0114] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Hydrogels are 3D crosslinked polymer matrices having a colossal tendency to imbibe water and exhibit swelling under physiological conditions without deformation in their hydrophilic network. Hydrogels being biodegradable and biocompatible, gained consideration due to some unique characteristics: responsiveness to external stimuli (pH, temperature) and swelling in aqueous solutions. Hydrogels offer a promising option for various pharmaceutical and biomedical applications, including tissue-specific drug delivery at a predetermined, controlled rate. This article presents a brief review of the recent and fundamental advances to design hydrogels, the swelling and deswelling mechanism, various crosslinking methods and their use as an intelligent carrier in the pharmaceutical field. Recent applications of hydrogels are also briefly discussed and exemplified.
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Abstract
Polyethylene (PE) is the key component of total knee replacement (TKR). The wear of polyethylene, a common cause of revision surgeries, depends on multiple factors. The mechanical properties, wear characteristics, and oxidative resistance of PE can be manipulated by the techniques of processing, sterilization, and packaging methods. This article describes the making of conventional and cross-linked poly, packaging, sterilization, processing techniques, and a summary of commercially available plastics and their rationale in TKR including the latest advances.
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Affiliation(s)
- Naga Cheppalli
- Orthopaedics, Veteran Affairs (VA) Hospital/University of New Mexico Hospital, Albuquerque, USA
| | | | - Benjamin S Albertson
- Orthopaedics & Rehabilitation, University of New Mexico Health Sciences Center, Albuquerque, USA
| | - Kenneth Yaw
- Orthopaedics, New Mexico Veteran Affairs (VA) Health Care System, Albuquerque, USA
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Herranz D, Coppola RE, Escudero-Cid R, Ochoa-Romero K, D'Accorso NB, Pérez-Flores JC, Canales-Vázquez J, Palacio C, Abuin GC, Ocón P. Application of Crosslinked Polybenzimidazole-Poly(Vinyl Benzyl Chloride) Anion Exchange Membranes in Direct Ethanol Fuel Cells. Membranes (Basel) 2020; 10:E349. [PMID: 33212912 DOI: 10.3390/membranes10110349] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/24/2020] [Revised: 11/10/2020] [Accepted: 11/12/2020] [Indexed: 11/22/2022]
Abstract
Crosslinked membranes have been synthesized by a casting process using polybenzimidazole (PBI) and poly(vinyl benzyl chloride) (PVBC). The membranes were quaternized with 1,4-diazabicyclo[2.2.2]octane (DABCO) to obtain fixed positive quaternary ammonium groups. XPS analysis has showed insights into the changes from crosslinked to quaternized membranes, demonstrating that the crosslinking reaction and the incorporation of DABCO have occurred, while the 13C-NMR corroborates the reaction of DABCO with PVBC only by one nitrogen atom. Mechanical properties were evaluated, obtaining maximum stress values around 72 MPa and 40 MPa for crosslinked and quaternized membranes, respectively. Resistance to oxidative media was also satisfactory and the membranes were evaluated in single direct ethanol fuel cell. PBI-c-PVBC/OH 1:2 membrane obtained 66 mW cm−2 peak power density, 25% higher than commercial PBI membranes, using 0.5 bar backpressure of pure O2 in the cathode and 1 mL min−1 KOH 2M EtOH 2 M aqueous solution in the anode. When the pressure was increased, the best performance was obtained by the same membrane, reaching 70 mW cm−2 peak power density at 2 bar O2 backpressure. Based on the characterization and single cell performance, PBI-c-PVBC/OH membranes are considered promising candidates as anion exchange electrolytes for direct ethanol fuel cells.
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9
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Ng YM, Mat Yusuf SNA, Chiu HI, Lim V. Redox-Sensitive Linear and Cross-Linked Cystamine-Based Polymers for Colon-Targeted Drug Delivery: Design, Synthesis, and Characterisation. Pharmaceutics 2020; 12:pharmaceutics12050461. [PMID: 32443633 PMCID: PMC7284438 DOI: 10.3390/pharmaceutics12050461] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Revised: 04/22/2020] [Accepted: 04/23/2020] [Indexed: 12/14/2022] Open
Abstract
Cystamine-based polymers may help to achieve controlled and targeted drug delivery to the colon due to their susceptibility to breakage of the disulfide linkage in the low redox potential environment of the colon. In this study, two linear cystamine-based polymers with similar repeating units (LP1 and LP2) and a cross-linked cystamine-based polymer (BP) were synthesised and their kinetics and the various physical conditions underlying cystamine-based polymerisation were evaluated. In brief, N1,N6-bis(2-(tritylthio)ethyl)adipamide (2) was synthesised from the reaction of triphenylmethanol and cysteamine. Next, the trityl group of 2 was removed with trifluoroacetic acid and triethylsilane before proceeding to oxidative polymerisation of the end product, N1,N6-bis(2-mercaptoethyl)adipamide (3) to LP1. The Schotten-Bauman reaction was applied to synthesise LP2 and BP from the reaction of cystamine with adipoyl chloride or trimesoyl chloride. Scanning electron microscopy, energy-dispersive X-ray spectroscopy, and mapping showed that oxygen, nitrogen, sulfur, and carbon were homogenously distributed in the polymers, with LP2 and BP having less porous morphologies compared to LP1. Results of zinc-acetic acid reduction showed that all polymers began to reduce after 15 min. Moreover, all synthesised polymers resisted stomach and small intestine conditions and only degraded in the presence of bacteria in the colon environment. Thus, these polymers have great potential for drug delivery applications. LP2 and BP, which were synthesised using the Schotten-Bauman reaction, were more promising than LP1 for colon-targeted drug delivery.
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Affiliation(s)
- Yoke Mooi Ng
- Integrative Medicine Cluster, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Bertam, Kepala Batas 13200, Penang, Malaysia; (Y.M.N.); (S.N.A.M.Y.); (H.I.C.)
| | - Siti Nur Aishah Mat Yusuf
- Integrative Medicine Cluster, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Bertam, Kepala Batas 13200, Penang, Malaysia; (Y.M.N.); (S.N.A.M.Y.); (H.I.C.)
- Department of Chemical Engineering Technology, Faculty of Engineering Technology, UniCITI Alam Campus, Universiti Malaysia Perlis, Padang Besar 02100, Perlis, Malaysia
| | - Hock Ing Chiu
- Integrative Medicine Cluster, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Bertam, Kepala Batas 13200, Penang, Malaysia; (Y.M.N.); (S.N.A.M.Y.); (H.I.C.)
| | - Vuanghao Lim
- Integrative Medicine Cluster, Advanced Medical and Dental Institute, Universiti Sains Malaysia, Bertam, Kepala Batas 13200, Penang, Malaysia; (Y.M.N.); (S.N.A.M.Y.); (H.I.C.)
- Correspondence: ; Tel.: +604-5622427
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Chuc-Gamboa MG, Vargas-Coronado RF, Cervantes-Uc JM, Cauich-Rodríguez JV, Escobar-García DM, Pozos-Guillén A, San Román del Barrio J. The Effect of PEGDE Concentration and Temperature on Physicochemical and Biological Properties of Chitosan. Polymers (Basel) 2019; 11:polym11111830. [PMID: 31703343 PMCID: PMC6918179 DOI: 10.3390/polym11111830] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 10/25/2019] [Accepted: 10/28/2019] [Indexed: 11/16/2022] Open
Abstract
Chitosan (CHT) is a polysaccharide with multiple claimed properties and outstanding biocompatibility, generally attributed to the presence of protonable amino groups rendering a cationic natural polymer. However, the effect of changes in CHT structure due to hydration is not considered in its performance. This study compares the effects on biocompatibility after drying at 25 °C and 150 °C scaffolds of chitosan, polyethylene glycol diglycidyl ether (PEGDE) crosslinked CHT (low, medium and high concentration) and glutaraldehyde (GA) crosslinked CHT. PEGDE crosslinked CHT showed a reduction in free amino groups and the amide I/II ratio, which exhaustive drying reduced further. In X-ray diffraction (DRX) analysis, PEGDE crosslinked CHT showed multiple peaks, whereas the crystallinity percentage was reduced with an increase in PEGDE concentration and thermal treatments at 150 °C. In a direct contact cell assay, high osteoblast viability was achieved at low and medium PEDGE concentrations, which was improved when the crosslinked scaffolds were thermally treated at 150 °C. This was attributed to its partial hydrophilicity, low crystallinity and low surface roughness; this in spite of the small reduction in the amount of free amino groups on the surface induced during drying at 150 °C. Furthermore, PEGDE crosslinked CHT scaffolds showed strong vinculin and integrin 1β expression, which render them suitable for bone contact applications.
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Affiliation(s)
- Martha Gabriela Chuc-Gamboa
- Unidad de Materiales, Centro de Investigación Científica de Yucatán, México. Calle 43 No. 130 x 32 y 34, Colonia Chuburná de Hidalgo, C.P. 97205 Mérida, Yucatán, Mexico; (M.G.C.-G.); (R.F.V.-C.); (J.M.C.-U.)
| | - Rossana Faride Vargas-Coronado
- Unidad de Materiales, Centro de Investigación Científica de Yucatán, México. Calle 43 No. 130 x 32 y 34, Colonia Chuburná de Hidalgo, C.P. 97205 Mérida, Yucatán, Mexico; (M.G.C.-G.); (R.F.V.-C.); (J.M.C.-U.)
| | - José Manuel Cervantes-Uc
- Unidad de Materiales, Centro de Investigación Científica de Yucatán, México. Calle 43 No. 130 x 32 y 34, Colonia Chuburná de Hidalgo, C.P. 97205 Mérida, Yucatán, Mexico; (M.G.C.-G.); (R.F.V.-C.); (J.M.C.-U.)
| | - Juan Valerio Cauich-Rodríguez
- Unidad de Materiales, Centro de Investigación Científica de Yucatán, México. Calle 43 No. 130 x 32 y 34, Colonia Chuburná de Hidalgo, C.P. 97205 Mérida, Yucatán, Mexico; (M.G.C.-G.); (R.F.V.-C.); (J.M.C.-U.)
- Correspondence: ; Tel.: +52-999-942-8330
| | - Diana María Escobar-García
- Laboratorio de Ciencias Básicas, Facultad de Estomatología, Universidad Autónoma de San Luis Potosí, México. Ave. Dr. Manuel Nava No. 2, Zona Universitaria, C.P. 78290 San Luis, S.L.P., Mexico; (D.M.E.-G.); (A.P.-G.)
| | - Amaury Pozos-Guillén
- Laboratorio de Ciencias Básicas, Facultad de Estomatología, Universidad Autónoma de San Luis Potosí, México. Ave. Dr. Manuel Nava No. 2, Zona Universitaria, C.P. 78290 San Luis, S.L.P., Mexico; (D.M.E.-G.); (A.P.-G.)
| | - Julio San Román del Barrio
- Instituto de Ciencia y Tecnología de Polímeros. España. Calle Juan de la Cierva, 3, C.P 28006 Madrid, Spain;
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Gil-Castell O, Galindo-Alfaro D, Sánchez-Ballester S, Teruel-Juanes R, Badia JD, Ribes-Greus A. Crosslinked Sulfonated Poly(vinyl alcohol)/Graphene Oxide Electrospun Nanofibers as Polyelectrolytes. Nanomaterials (Basel) 2019; 9:nano9030397. [PMID: 30857239 PMCID: PMC6474007 DOI: 10.3390/nano9030397] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Revised: 03/04/2019] [Accepted: 03/05/2019] [Indexed: 11/25/2022]
Abstract
Taking advantage of the high functionalization capacity of poly(vinyl alcohol) (PVA), bead-free homogeneous nanofibrous mats were produced. The addition of functional groups by means of grafting strategies such as the sulfonation and the addition of nanoparticles such as graphene oxide (GO) were considered to bring new features to PVA. Two series of sulfonated and nonsulfonated composite nanofibers, with different compositions of GO, were prepared by electrospinning. The use of sulfosuccinic acid (SSA) allowed crosslinked and functionalized mats with controlled size and morphology to be obtained. The functionalization of the main chain of the PVA and the determination of the optimum composition of GO were analyzed in terms of the nanofibrous morphology, the chemical structure, the thermal properties, and conductivity. The crosslinking and the sulfonation treatment decreased the average fiber diameter of the nanofibers, which were electrical insulators regardless of the composition. The addition of small amounts of GO contributed to the retention of humidity, which significantly increased the proton conductivity. Although the single sulfonation of the polymer matrix produced a decrease in the proton conductivity, the combination of the sulfonation, the crosslinking, and the addition of GO enhanced the proton conductivity. The proposed nanofibers can be considered as good candidates for being exploited as valuable components for ionic polyelectrolyte membranes.
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Affiliation(s)
- Oscar Gil-Castell
- Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València (UPV), Camino de Vera s/n, 46022 Valencia, Spain.
- Department of Chemical Engineering, School of Engineering, Universitat de València, Av. de la Universitat s/n, 46100 Burjassot, Spain.
| | - Diana Galindo-Alfaro
- Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València (UPV), Camino de Vera s/n, 46022 Valencia, Spain.
| | - Soraya Sánchez-Ballester
- Packaging, Transport, & Logistics Research Institute (ITENE), C/Albert Einstein, 1, Parque Tecnológico, 46980 Paterna, Spain.
| | - Roberto Teruel-Juanes
- Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València (UPV), Camino de Vera s/n, 46022 Valencia, Spain.
| | - José David Badia
- Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València (UPV), Camino de Vera s/n, 46022 Valencia, Spain.
- Department of Chemical Engineering, School of Engineering, Universitat de València, Av. de la Universitat s/n, 46100 Burjassot, Spain.
| | - Amparo Ribes-Greus
- Instituto de Tecnología de Materiales (ITM), Universitat Politècnica de València (UPV), Camino de Vera s/n, 46022 Valencia, Spain.
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Landis RF, Li CH, Gupta A, Lee YW, Yazdani M, Ngernyuang N, Altinbasak I, Mansoor S, Khichi MAS, Sanyal A, Rotello VM. Biodegradable Nanocomposite Antimicrobials for the Eradication of Multidrug-Resistant Bacterial Biofilms without Accumulated Resistance. J Am Chem Soc 2018; 140:6176-6182. [PMID: 29709168 PMCID: PMC6044909 DOI: 10.1021/jacs.8b03575] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Infections caused by multidrug-resistant (MDR) bacteria are a rapidly growing threat to human health, in many cases exacerbated by their presence in biofilms. We report here a biocompatible oil-in-water cross-linked polymeric nanocomposite that degrades in the presence of physiologically relevant biomolecules. These degradable nanocomposites demonstrated broad-spectrum penetration and elimination of MDR bacteria, eliminating biofilms with no toxicity to cocultured mammalian fibroblast cells. Notably, serial passaging revealed that bacteria were unable to develop resistance toward these nanocomposites, highlighting the therapeutic promise of this platform.
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Affiliation(s)
- Ryan F. Landis
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, United States
| | - Cheng-Hsuan Li
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, United States
| | - Akash Gupta
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, United States
| | - Yi-Wei Lee
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, United States
| | - Mahdieh Yazdani
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, United States
| | - Nipaporn Ngernyuang
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, United States
- Chulabhorn International College of Medicine, Thammasat University, Pathum Thani 12120, Thailand
| | - Ismail Altinbasak
- Department of Chemistry, Bogazici University, Istanbul 34342, Turkey
| | - Sanaa Mansoor
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, United States
| | - Muhammadaha A. S. Khichi
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, United States
| | - Amitav Sanyal
- Department of Chemistry, Bogazici University, Istanbul 34342, Turkey
| | - Vincent M. Rotello
- Department of Chemistry, University of Massachusetts Amherst, 710 North Pleasant Street, Amherst, Massachusetts 01003, United States
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13
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Abstract
Metal-containing polymer hydrogels have attracted increasing interest in recent years due to their outstanding properties such as biocompatibility, recoverability, self-healing, and/or redox activity. In this short review, methods for the preparation of metal-containing polymer hydrogels are introduced and an overview of these hydrogels with various functionalities is given. It is hoped that this short update can stimulate innovative ideas to promote the research of metal-containing hydrogels in the communities.
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Affiliation(s)
- Hui Li
- School of Chemistry and Chemical Engineering and Shandong Key Laboratory of Fluorine Chemistry and Chemical Engineering Materials, University of Jinan, Jinan, 250022, China
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, 29208, USA
| | - Peng Yang
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, 29208, USA
| | - Parasmani Pageni
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, 29208, USA
| | - Chuanbing Tang
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC, 29208, USA
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14
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Awang MA, Firdaus MAB, Busra MB, Chowdhury SR, Fadilah NR, Wan Hamirul WK, Reusmaazran MY, Aminuddin MY, Ruszymah BHI. Cytotoxic evaluation of biomechanically improved crosslinked ovine collagen on human dermal fibroblasts. Biomed Mater Eng 2015; 24:1715-24. [PMID: 24948455 DOI: 10.3233/bme-140983] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Earlier studies in our laboratory demonstrated that collagen extracted from ovine tendon is biocompatible towards human dermal fibroblast. To be able to use this collagen as a scaffold in skin tissue engineering, a mechanically stronger scaffold is required that can withstand manipulation before transplantation. This study was conducted to improve the mechanical strength of this collagen sponge using chemical crosslinkers, and evaluate their effect on physical, chemical and biocompatible properties. Collagen sponge was crosslinked with 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) and glutaraldehyde (GA). Tensile test, FTIR study and mercury porosimetry were used to evaluate mechanical properties, chemical property and porosity, respectively. MTT assay was performed to evaluate the cytotoxic effect of crosslinked collagen sponge on human dermal fibroblasts. The FTIR study confirmed the successful crosslinking of collagen sponge. Crosslinking with EDC and GA significantly increased the mechanical strength of collagen sponge, with GA being more superior. Crosslinking of collagen sponge significantly reduced the porosity and the effect was predominant in GA-crosslinked collagen sponge. The GA-crosslinked collagen showed significantly lower, 60% cell viability towards human dermal fibroblasts compared to that of EDC-crosslinked collagen, 80% and non-crosslinked collagen, 100%. Although the mechanical strength was better when using GA but the more toxic effect on dermal fibroblast makes EDC a more suitable crosslinker for future skin tissue engineering.
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Affiliation(s)
- M A Awang
- Tissue Engineering Centre, UKM Medical Centre, Kuala Lumpur, Malaysia
| | - M A B Firdaus
- Tissue Engineering Centre, UKM Medical Centre, Kuala Lumpur, Malaysia
| | - M B Busra
- Tissue Engineering Centre, UKM Medical Centre, Kuala Lumpur, Malaysia
| | - S R Chowdhury
- Tissue Engineering Centre, UKM Medical Centre, Kuala Lumpur, Malaysia
| | - N R Fadilah
- Department of Biomedical Science, Faculty of Allied Health Science, UKM, Kuala Lumpur, Malaysia
| | | | | | - M Y Aminuddin
- Tissue Engineering Centre, UKM Medical Centre, Kuala Lumpur, Malaysia Ear, Nose & Throat Consultant Clinic, Ampang Puteri Specialist Hospital, Ampang, Malaysia
| | - B H I Ruszymah
- Tissue Engineering Centre, UKM Medical Centre, Kuala Lumpur, Malaysia Department of Physiology, Medical Faculty, UKM, Kuala Lumpur, Malaysia
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15
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Liu M, Zhang X, Yang B, Liu L, Deng F, Zhang X, Wei Y. Polylysine crosslinked AIE dye based fluorescent organic nanoparticles for biological imaging applications. Macromol Biosci 2014; 14:1260-7. [PMID: 24854875 DOI: 10.1002/mabi.201400140] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2014] [Revised: 04/15/2014] [Indexed: 12/11/2022]
Abstract
Fluorescent organic nanoparticles based on aggregation induced emission dyes are fabricated through a ring-opening reaction using polylysine as the linker. The fluorescent organic nanoparticles obtained are characterized by a series of techniques including UV-vis absorption spectroscopy, fluorescence spectroscopy, Fourier Transform infrared spectroscopy, and transmission electron microscopy. A biocompatibility evaluation and the cell uptake behavior of the fluorescent organic nanoparticles are further investigated to evaluate their potential biomedical applications. It is demonstrated that these fluorescent organic nanoparticles can be obtained at room temperature in an air atmosphere without the need for catalyst or initiator. Furthermore, these crosslinked aggregation induced emission dye based fluorescent organic nanoparticles show uniform morphology, strong red fluorescence, high water dispersability, and excellent biocompatibility, making them promising candidates for various biomedical applications.
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Affiliation(s)
- Meiying Liu
- Department of Chemistry/Institute of Polymers, Nanchang University, 999 Xuefu Avenue, Nanchang, 330031, China
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16
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Deng HX, Shi Y, Furukawa Y, Zhai H, Fu R, Liu E, Gorrie GH, Khan MS, Hung WY, Bigio EH, Lukas T, Dal Canto MC, O'Halloran TV, Siddique T. Conversion to the amyotrophic lateral sclerosis phenotype is associated with intermolecular linked insoluble aggregates of SOD1 in mitochondria. Proc Natl Acad Sci U S A 2006; 103:7142-7. [PMID: 16636275 PMCID: PMC1447523 DOI: 10.1073/pnas.0602046103] [Citation(s) in RCA: 337] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2006] [Indexed: 11/18/2022] Open
Abstract
Twenty percent of the familial form of amyotrophic lateral sclerosis (ALS) is caused by mutations in the Cu, Zn-superoxide dismutase gene (SOD1) through the gain of a toxic function. The nature of this toxic function of mutant SOD1 has remained largely unknown. Here we show that WT SOD1 not only hastens onset of the ALS phenotype but can also convert an unaffected phenotype to an ALS phenotype in mutant SOD1 transgenic mouse models. Further analyses of the single- and double-transgenic mice revealed that conversion of mutant SOD1 from a soluble form to an aggregated and detergent-insoluble form was associated with development of the ALS phenotype in transgenic mice. Conversion of WT SOD1 from a soluble form to an aggregated and insoluble form also correlates with exacerbation of the disease or conversion to a disease phenotype in double-transgenic mice. This conversion, observed in the mitochondrial fraction of the spinal cord, involved formation of insoluble SOD1 dimers and multimers that are crosslinked through intermolecular disulfide bonds via oxidation of cysteine residues in SOD1. Our data thus show a molecular mechanism by which SOD1, an important protein in cellular defense against free radicals, is converted to aggregated and apparently ALS-associated toxic dimers and multimers by redox processes. These findings provide evidence of direct links among oxidation, protein aggregation, mitochondrial damage, and SOD1-mediated ALS, with possible applications to the aging process and other late-onset neurodegenerative disorders. Importantly, rational therapy based on these observations can now be developed and tested.
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Affiliation(s)
- Han-Xiang Deng
- *Davee Department of Neurology and Clinical Neurosciences
| | - Yong Shi
- *Davee Department of Neurology and Clinical Neurosciences
| | | | - Hong Zhai
- *Davee Department of Neurology and Clinical Neurosciences
| | - Ronggen Fu
- *Davee Department of Neurology and Clinical Neurosciences
| | - Erdong Liu
- *Davee Department of Neurology and Clinical Neurosciences
| | | | | | - Wu-Yen Hung
- *Davee Department of Neurology and Clinical Neurosciences
| | | | - Thomas Lukas
- Department of Molecular Pharmacology and Biological Chemistry
| | | | | | - Teepu Siddique
- *Davee Department of Neurology and Clinical Neurosciences
- Department of Cell and Molecular Biology, and
- **Northwestern University Institute for Neuroscience, Northwestern University Feinberg School of Medicine, Tarry Building, Room 13-715, 303 East Chicago Avenue, Chicago, IL 60611
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