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Aminlashgari N, Höglund OV, Borg N, Hakkarainen M. Degradation profile and preliminary clinical testing of a resorbable device for ligation of blood vessels. Acta Biomater 2013; 9:6898-904. [PMID: 23438863 DOI: 10.1016/j.actbio.2013.02.018] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2012] [Revised: 01/11/2013] [Accepted: 02/05/2013] [Indexed: 11/18/2022]
Abstract
A resorbable device for ligation of blood vessels was developed and tested in vitro to reveal the degradation profile of the device and to predict the clinical performance in terms of adequate mechanical support during a healing period of 1week. In addition, preliminary clinical testing was performed that showed complete hemostasis and good tissue grip of renal arteries in five pigs. The device was made by injection molding of poly(glycolide-co-trimethylene carbonate) triblock copolymer, and it consisted of a case with a locking mechanism connected to a partly perforated flexible band. A hydrolytic degradation study was carried out for 7, 30 and 60days in water and buffer medium, following the changes in mass, water absorption, pH and mechanical properties. A new rapid matrix-free laser desorption ionization-mass spectrometry (LDI-MS) method was developed for direct screening of degradation products released into the degradation medium. The combination of LDI-MS and electrospray ionization-mass spectrometry analyses enabled the comparison of the degradation product patterns in water and buffer medium. The identified degradation products were rich in trimethylene carbonate units, indicating preferential hydrolysis of amorphous regions where trimethylene units are located. The crystallinity of the material was doubled after 60days of hydrolysis, additionally confirming the preferential hydrolysis of trimethylene carbonate units and the enrichment of glycolide units in the remaining solid matrix. The mechanical performance of the perforated band was followed for the first week of hydrolysis and the results suggest that sufficient strength is retained during the healing time of the blood vessels.
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Affiliation(s)
- Nina Aminlashgari
- Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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52
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Sacchetin PSC, Morales AR, Moraes ÂM, Rosa PDTVE. Formation of PLA particles incorporating 17α-methyltestosterone by supercritical fluid technology. J Supercrit Fluids 2013. [DOI: 10.1016/j.supflu.2013.02.029] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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53
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Abstract
Recent work describes changes in polylactic acid samples with different crystallinity during microbiological degradation. We treated PLA at 93°C for different periods of time, which yielded samples with particular crystallinity. The fraction of crystalline phase was determined by differential scanning calorimetry, and the visual effect of crystallinity was measured by colorimetric method with black and white backgrounds. The medium for biological degradation process was living sludge under room temperature and normal atmospheric pressure. Furthermore, the change in mass was also measured. The results show that increased crystallinity reduces the rate of mass lost. The volumetric proportion of crystallinity is in direct correlation with opacity, so checking transparency is also a suitable possibility for estimating crystallinity. DSC, colorimetric method and visual observation experiments confirm that crystallinity has increased proportionally by the time of heat treatment and caused opacity. The experiments show that water uptake happened faster and in much higher volume in polymers having dominantly amorphous structure than in the case of samples with higher crystallinity. In the case of materials with only 2.43% crystallinity, weight lost began later because they had a greater water uptake during the first 7-12 days, while this period took only 7 days with a very low water uptake for samples containing approximately 35% crystalline phase. After swelling, weight loss of the crystalline samples was much slower than that of samples containing more amorphous parts, because crystalline phases inhibit the diffusion of small water molecules and the microbes with it.
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54
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Fukushima K, Tabuani D, Arena M, Gennari M, Camino G. Effect of clay type and loading on thermal, mechanical properties and biodegradation of poly(lactic acid) nanocomposites. REACT FUNCT POLYM 2013. [DOI: 10.1016/j.reactfunctpolym.2013.01.003] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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55
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Santonja-Blasco L, Ribes-Greus A, Alamo R. Comparative thermal, biological and photodegradation kinetics of polylactide and effect on crystallization rates. Polym Degrad Stab 2013. [DOI: 10.1016/j.polymdegradstab.2012.12.012] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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56
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Fukushima K, Feijoo JL, Yang MC. Comparison of abiotic and biotic degradation of PDLLA, PCL and partially miscible PDLLA/PCL blend. Eur Polym J 2013. [DOI: 10.1016/j.eurpolymj.2012.12.011] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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57
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Fukushima K, Feijoo JL, Yang MC. Abiotic degradation of poly(dl-lactide), poly(ɛ-caprolactone) and their blends. Polym Degrad Stab 2012. [DOI: 10.1016/j.polymdegradstab.2012.07.030] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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58
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Preparation of chitin nanofiber-graft-poly(l-lactide-co-ε-caprolactone) films by surface-initiated ring-opening graft copolymerization. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.08.060] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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59
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Hermanová S, Omelková J, Voběrková S, Bálková R, Richtera L, Mravcová L, Jančář J. The Effect of Processing of Polycaprolactone Films on Degradation Process Initiated byAspergillus OryzaeLipase. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 2012. [DOI: 10.1080/1023666x.2012.696402] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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60
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Fukushima K, Giménez E, Cabedo L, Lagarón J, Feijoo J. Biotic degradation of poly(dl-lactide) based nanocomposites. Polym Degrad Stab 2012. [DOI: 10.1016/j.polymdegradstab.2012.05.029] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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61
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Aminlashgari N, Hakkarainen M. Surface assisted laser desorption ionization-mass spectrometry (SALDI-MS) for analysis of polyester degradation products. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2012; 23:1071-1076. [PMID: 22392621 DOI: 10.1007/s13361-012-0360-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2011] [Revised: 02/03/2012] [Accepted: 02/06/2012] [Indexed: 05/31/2023]
Abstract
Novel surface assisted laser desorption ionization-mass spectrometry (SALDI-MS) method was developed for rapid analysis of low molecular mass polyesters and their degradation products by laser desorption ionization-mass spectrometry. Three polycaprolactone materials were analyzed by the developed method before and after hydrolytic degradation. The signal-to-noise values obtained by SALDI-MS were 20-100 times higher compared with the ones obtained by using traditional MALDI-MS matrices. A clean background at low mass range and higher resolution was obtained by SALDI-MS. Different nanoparticle, cationizing agent, and solvent combinations were evaluated. Halloysite nanoclay and magnesium hydroxide showed the best potential as SALDI surfaces. The SALDI-MS spectrum of the polyester hydrolysis products was verified by ESI-MS. The developed SALDI-MS method possesses several advantages over existing methods for similar analyses.
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Affiliation(s)
- Nina Aminlashgari
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
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62
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Characterization of poly-hydroxybutyrate films and hemp fiber reinforced composites exposed to accelerated weathering. Polym Degrad Stab 2012. [DOI: 10.1016/j.polymdegradstab.2012.03.040] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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63
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64
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Modeling the kinetics of water transport and hydroexpansion in a lignocellulose-reinforced bacterial copolyester. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.03.036] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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65
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Braud C. Capillary zone electrophoresis as a tool to monitor the last stages of the degradation of water-sensitive polymers. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 15:423-47. [PMID: 15212327 DOI: 10.1163/156856204323005299] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In order to monitor the formation of the water-soluble by-products from chain-scission of degradable polymers used in the biomedical field, four capillary electrophoresis methods are discussed with the aim of giving the limits and performance for each. Three of them (electroosmotic flow reversal by dynamic adsorption of a polycation, multilayer polyelectrolyte coatings and physical binding of polyethylene oxide) are based on the use of dynamic coatings onto the inner surface of a fused silica capillary, a simple means to adapt performance to specific separations via modification and control of the electroosmotic flow of fused capillary. Using oligomers of lactic acid considered as standards the methods are compared. Other examples of ester-containing macromolecules (poly(hydroxybutyrate)), as well as degradable polyanions are described, namely N-acetylneuraminate polymer and poly(beta-malic acid).
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Affiliation(s)
- Christian Braud
- CRBA, CNRS, UMR 5473, Faculté de Pharmacie, Université Montpellier 1, 15 avenue Charles Flahault, BP 14491, 34093 Montpellier 5, France.
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66
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Mattioli S, Kenny JM, Armentano I. Plasma surface modification of porous PLLA films: Analysis of surface properties and in vitro hydrolytic degradation. J Appl Polym Sci 2012. [DOI: 10.1002/app.36827] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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67
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Pyrolysis-GC–MS reveals important differences in hydrolytic degradation process of wood flour and rice bran filled polylactide composites. Polym Degrad Stab 2012. [DOI: 10.1016/j.polymdegradstab.2011.12.017] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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68
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Shen T, Lu M, Zhou D, Liang L. Effect of reactive blocked polyisocyanate on the properties of solvent cast blends from poly(lactic acid) and poly(ethylene glycol). J Appl Polym Sci 2012. [DOI: 10.1002/app.36276] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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69
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Zhang Y, Meng B, Chen L, Tao J, Wu Z. Properties and structures of polylactide filled with poly(ε-caprolactone)-coated calcium carbonate. J Appl Polym Sci 2011. [DOI: 10.1002/app.36280] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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70
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Fukushima K, Tabuani D, Dottori M, Armentano I, Kenny J, Camino G. Effect of temperature and nanoparticle type on hydrolytic degradation of poly(lactic acid) nanocomposites. Polym Degrad Stab 2011. [DOI: 10.1016/j.polymdegradstab.2011.09.018] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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71
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Beslikas T, Gigis I, Goulios V, Christoforides J, Papageorgiou GZ, Bikiaris DN. Crystallization study and comparative in vitro-in vivo hydrolysis of PLA reinforcement ligament. Int J Mol Sci 2011; 12:6597-618. [PMID: 22072906 PMCID: PMC3210997 DOI: 10.3390/ijms12106597] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Revised: 09/24/2011] [Accepted: 09/28/2011] [Indexed: 11/16/2022] Open
Abstract
In the present work, the crystallization behavior and in vitro-in vivo hydrolysis rates of PLA absorbable reinforcement ligaments used in orthopaedics for the repair and reinforcement of articulation instabilities were studied. Tensile strength tests showed that this reinforcement ligament has similar mechanical properties to Fascia Latta, which is an allograft sourced from the ilio-tibial band of the human body. The PLA reinforcement ligament is a semicrystalline material with a glass transition temperature around 61 °C and a melting point of ~178 °C. Dynamic crystallization revealed that, although the crystallization rates of the material are slow, they are faster than the often-reported PLA crystallization rates. Mass loss and molecular weight reduction measurements showed that in vitro hydrolysis at 50 °C initially takes place at a slow rate, which gets progressively higher after 30-40 days. As found from SEM micrographs, deterioration of the PLA fibers begins during this time. Furthermore, as found from in vivo hydrolysis in the human body, the PLA reinforcement ligament is fully biocompatible and after 6 months of implantation is completely covered with flesh. However, the observed hydrolysis rate from in vivo studies was slow due to high molecular weight and degree of crystallinity.
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Affiliation(s)
- Theodore Beslikas
- 2nd Orthopaedic Department, Aristotle University of Thessaloniki, Thessaloniki, Macedonia 54124, Greece; E-Mails: (T.B.); (I.G.); (V.G.); (J.C.)
| | - Ioannis Gigis
- 2nd Orthopaedic Department, Aristotle University of Thessaloniki, Thessaloniki, Macedonia 54124, Greece; E-Mails: (T.B.); (I.G.); (V.G.); (J.C.)
| | - Vasilios Goulios
- 2nd Orthopaedic Department, Aristotle University of Thessaloniki, Thessaloniki, Macedonia 54124, Greece; E-Mails: (T.B.); (I.G.); (V.G.); (J.C.)
| | - John Christoforides
- 2nd Orthopaedic Department, Aristotle University of Thessaloniki, Thessaloniki, Macedonia 54124, Greece; E-Mails: (T.B.); (I.G.); (V.G.); (J.C.)
| | - George Z. Papageorgiou
- Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Macedonia 54124, Greece; E-Mail:
| | - Dimitrios N. Bikiaris
- Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Macedonia 54124, Greece; E-Mail:
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +30-2310-997812; Fax: +30-2310-997667
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72
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Cakir S, Kierkels R, Koning C. Polyamide 6-polycaprolactone multiblock copolymers: Synthesis, characterization, and degradation. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24716] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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73
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Shikanov A, Shikanov S, Vaisman B, Golenser J, Domb AJ. Cisplatin tumor biodistribution and efficacy after intratumoral injection of a biodegradable extended release implant. CHEMOTHERAPY RESEARCH AND PRACTICE 2011; 2011:175054. [PMID: 22295203 PMCID: PMC3265254 DOI: 10.1155/2011/175054] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Revised: 11/26/2010] [Accepted: 01/11/2011] [Indexed: 11/23/2022]
Abstract
Local delivery of chemotherapeutic drugs has long been recognized as a potential method for reaching high drug doses at the target site while minimizing systemic exposure. Cisplatin is one of the most effective chemotherapeutic agents for the treatment of various tumors; however, its systemic toxicity remains the primary dose-limiting factor. Here we report that incorporation of cisplatin into a fatty acid-based polymer carrier followed by a local injection into the solid tumor resulted in a successful tumor growth inhibition in heterotopic mouse bladder tumor model in mice. Platinum concentration in the tumor tissue surrounding the injected implant remained above the therapeutic level up to 14 days after the injection, while the plasma levels were several orders of magnitude lower comparing to systemic delivery. The reported delivery system increased the maximum tolerated dose of cisplatin 5 times compared to systemic delivery, thus potentially improving antitumor efficacy of cisplatin in solid tumor model.
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Affiliation(s)
- Ariella Shikanov
- Department of Medicinal Chemistry and Natural Products, School of Pharmacy, The Hebrew University of Jerusalem, 91120 Jerusalem, Israel
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74
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Odelius K, Höglund A, Kumar S, Hakkarainen M, Ghosh AK, Bhatnagar N, Albertsson AC. Porosity and pore size regulate the degradation product profile of polylactide. Biomacromolecules 2011; 12:1250-8. [PMID: 21344847 DOI: 10.1021/bm1015464] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Porosity and pore size regulated the degradation rate and the release of low molar mass degradation products from porous polylactide (PLA) scaffolds. PLA scaffolds with porosities above 90% and different pore size ranges were subjected to hydrolytic degradation and compared to their solid analog. The solid film degraded fastest and the degradation rate of the porous structures decreased with decreasing pore size. Degradation products were detected earlier from the solid films compared to the porous structures as a result of the additional migration path within the porous structures. An intermediate degradation rate profile was observed when the pore size range was broadened. The morphology of the scaffolds changed during hydrolysis where the larger pore size scaffolds showed sharp pore edges and cavities on the scaffold surface. In the scaffolds with smaller pores, the pore size decreased during degradation and a solid surface was formed on the top of the scaffold. Porosity and pore size, thus, influenced the degradation and the release of degradation products that should be taken into consideration when designing porous scaffolds for tissue engineering.
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Affiliation(s)
- Karin Odelius
- Department of Fibre and Polymer Technology, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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75
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Inkinen S, Hakkarainen M, Albertsson AC, Södergård A. From Lactic Acid to Poly(lactic acid) (PLA): Characterization and Analysis of PLA and Its Precursors. Biomacromolecules 2011; 12:523-32. [DOI: 10.1021/bm101302t] [Citation(s) in RCA: 495] [Impact Index Per Article: 38.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Saara Inkinen
- Laboratory of Polymer Technology, Center for Functional Materials (FUNMAT), Åbo Akademi University, Piispankatu 8, 20100 Turku, Finland
| | - Minna Hakkarainen
- The Royal Institute of Technology (KTH), Department of Fibre and Polymer Technology, Teknikringen 56-58, 10044 Stockholm, Sweden
| | - Ann-Christine Albertsson
- The Royal Institute of Technology (KTH), Department of Fibre and Polymer Technology, Teknikringen 56-58, 10044 Stockholm, Sweden
| | - Anders Södergård
- Laboratory of Polymer Technology, Center for Functional Materials (FUNMAT), Åbo Akademi University, Piispankatu 8, 20100 Turku, Finland
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76
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Ethirajan A, Musyanovych A, Chuvilin A, Landfester K. Biodegradable Polymeric Nanoparticles as Templates for Biomimetic Mineralization of Calcium Phosphate. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201000694] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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77
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Preparation, characterization and biodegradation of biopolymer nanocomposites based on fumed silica. Eur Polym J 2011. [DOI: 10.1016/j.eurpolymj.2010.10.027] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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78
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Gryn'ova G, Hodgson JL, Coote ML. Revising the mechanism of polymer autooxidation. Org Biomol Chem 2011; 9:480-90. [DOI: 10.1039/c0ob00596g] [Citation(s) in RCA: 144] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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79
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80
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Deshayes G, Delcourt C, Verbruggen I, Trouillet-Fonti L, Touraud F, Fleury E, Degée P, Destarac M, Willem R, Dubois P. Novel polyesteramide-based di- and triblock copolymers: From thermo-mechanical properties to hydrolytic degradation. Eur Polym J 2011. [DOI: 10.1016/j.eurpolymj.2010.07.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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81
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Opaprakasit M, Kongtong W, Petchsuk A, Opaprakasit P. Processability enhancement of poly(lactic acid-co-ethylene terephthalate) by blending with poly(ethylene-co-vinyl acetate), poly(3-hydroxybutyrate-co-3-hydroxyvalerate), and poly(butylene succinate). Polym Bull (Berl) 2010. [DOI: 10.1007/s00289-010-0421-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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82
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Santonja-Blasco L, Moriana R, Badía J, Ribes-Greus A. Thermal analysis applied to the characterization of degradation in soil of polylactide: I. Calorimetric and viscoelastic analyses. Polym Degrad Stab 2010. [DOI: 10.1016/j.polymdegradstab.2010.08.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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83
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Badía J, Santonja-Blasco L, Moriana R, Ribes-Greus A. Thermal analysis applied to the characterization of degradation in soil of polylactide: II. On the thermal stability and thermal decomposition kinetics. Polym Degrad Stab 2010. [DOI: 10.1016/j.polymdegradstab.2010.06.002] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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84
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Fukushima K, Tabuani D, Abbate C, Arena M, Ferreri L. Effect of sepiolite on the biodegradation of poly(lactic acid) and polycaprolactone. Polym Degrad Stab 2010. [DOI: 10.1016/j.polymdegradstab.2010.07.004] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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85
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Haslauer CM, Moghe AK, Osborne JA, Gupta BS, Loboa EG. Collagen-PCL sheath-core bicomponent electrospun scaffolds increase osteogenic differentiation and calcium accretion of human adipose-derived stem cells. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 22:1695-712. [PMID: 20836922 DOI: 10.1163/092050610x521595] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Human adipose-derived stem cells (hASCs) are an abundant cell source capable of osteogenic differentiation, and have been investigated as an autologous stem cell source for bone tissue engineering applications. The objective of this study was to determine if the addition of a type-I collagen sheath to the surface of poly(ε-caprolactone) (PCL) nanofibers would enhance viability, proliferation and osteogenesis of hASCs. This is the first study to examine the differentiation behavior of hASCs on collagen-PCL sheath-core bicomponent nanofiber scaffolds developed using a co-axial electrospinning technique. The use of a sheath-core configuration ensured a uniform coating of collagen on the PCL nanofibers. PCL nanofiber scaffolds prepared using a conventional electrospinning technique served as controls. hASCs were seeded at a density of 20 000 cells/cm(2) on 1 cm(2) electrospun nanofiber (pure PCL or collagen-PCL sheath-core) sheets. Confocal microscopy and hASC proliferation data confirmed the presence of viable cells after 2 weeks in culture on all scaffolds. Greater cell spreading occurred on bicomponent collagen-PCL scaffolds at earlier time points. hASCs were osteogenically differentiated by addition of soluble osteogenic inductive factors. Calcium quantification indicated cell-mediated calcium accretion was approx. 5-times higher on bicomponent collagen-PCL sheath-core scaffolds compared to PCL controls, indicating collagen-PCL bicomponent scaffolds promoted greater hASC osteogenesis after two weeks of culture in osteogenic medium. This is the first study to examine the effects of collagen-PCL sheath-core composite nanofibers on hASC viability, proliferation and osteogenesis. The sheath-core composite fibers significantly increased calcium accretion of hASCs, indicating that collagen-PCL sheath-core bicomponent structures have potential for bone tissue engineering applications using hASCs.
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Affiliation(s)
- Carla Maria Haslauer
- Joint Department of Biomedical Engineering, North Carolina State University, Raleigh, NC 27695, USA
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86
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Sustained release of complexed DNA from films: Study of bioactivity and intracellular tracking. Biointerphases 2010; 5:FA69-77. [DOI: 10.1116/1.3493692] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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87
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Antheunis H, van der Meer JC, de Geus M, Heise A, Koning CE. Autocatalytic equation describing the change in molecular weight during hydrolytic degradation of aliphatic polyesters. Biomacromolecules 2010; 11:1118-24. [PMID: 20187614 DOI: 10.1021/bm100125b] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The autocatalytic equation derived in this study describes and even predicts the evolution of the number average molecular weight of aliphatic polyesters upon hydrolytic degradation. The main reaction in the degradation of aliphatic polyesters is autocatalytic hydrolysis of ester bonds, which causes the molecular weight to decrease. During hydrolysis of the ester bonds in the main chain of the polyester, the chains are cleaved and the end group concentrations will rise. The fundamentals of this equation are based on that principle. To validate the derived equation, the hydrolytic degradation of poly(4-methylcaprolactone), poly(epsilon-caprolactone), poly(d,l-lactide), and two different poly(d,l-lactide-co-glycolide) copolymers was monitored after immersion in a PBS buffer (pH = 7.4) at 37 degrees C. The number average molecular weight, mass loss, and crystallinity were determined after different time intervals. The experimental results confirm that hydrolytic degradation of aliphatic polyesters is a bulk erosion process. When comparing the M(n), calculated with the new autocatalytic equation, with the experimental results, it was found that the new model can predict the decrease of the M(n) upon hydrolytic degradation for semicrystalline and amorphous polymers, as well as for copolymers, without the need for complicated mathematics and excessive input parameters. This is a major improvement with respect to earlier proposed models in literature.
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Affiliation(s)
- Harro Antheunis
- Product Development Department, N.V. Organon, P.O. Box 20, 5340 BH Oss, The Netherlands
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88
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Ethirajan A, Landfester K. Functional Hybrid Materials with Polymer Nanoparticles as Templates. Chemistry 2010; 16:9398-412. [DOI: 10.1002/chem.201001477] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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89
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Focarete ML, Gualandi C, Scandola M, Govoni M, Giordano E, Foroni L, Valente S, Pasquinelli G, Gao W, Gross RA. Electrospun scaffolds of a polyhydroxyalkanoate consisting of omega-hydroxylpentadecanoate repeat units: fabrication and in vitro biocompatibility studies. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 21:1283-96. [PMID: 20534185 DOI: 10.1163/092050609x12517190417597] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Electrospinning was used to fabricate fibrous scaffolds of lipase-catalyzed poly(omega-pentadecalactone) (PPDL). The slow resorbability of this biomaterial is expected to be valuable for tissue-engineering applications requiring long healing times. The effect of solvent systems and instrumental parameters on fiber morphology was investigated. PPDL electrospinning was optimized and defect-free fibers (diameter 410 +/- 150 nm) were obtained by using a mixed three-solvent system. Scaffolds were characterized by scanning electron microscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXS). TGA showed no residual solvent in the scaffolds. DSC and WAXS results indicated that electrospun PPDL is semicrystalline. Biocompatibility of PPDL scaffolds was evaluated through indirect cytotoxicity tests using embryonic rat cardiac H9c2 cells. The ability of PPDL electrospun mats to support cell growth was verified by culturing H9c2 cells onto the scaffold. Cell adhesion, proliferation and morphology were evaluated. The results indicated that PPDL mats are not cytotoxic and they support proliferation of H9c2 cells. The cumulative results of this study suggest further exploration of PPDL fibrous mats as scaffolds for tissue-engineered constructs.
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Affiliation(s)
- Maria Letizia Focarete
- University of Bologna, Department of Chemistry G. Ciamician and National Consortium of Materials Science and Technology (INSTM, RU Bologna), via Selmi 2, 40126 Bologna, Italy.
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90
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Fukushima K, Abbate C, Tabuani D, Gennari M, Rizzarelli P, Camino G. Biodegradation trend of poly(ε-caprolactone) and nanocomposites. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2010. [DOI: 10.1016/j.msec.2010.02.012] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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91
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Electrospinning: A fascinating fiber fabrication technique. Biotechnol Adv 2010; 28:325-47. [DOI: 10.1016/j.biotechadv.2010.01.004] [Citation(s) in RCA: 3247] [Impact Index Per Article: 231.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2009] [Revised: 09/17/2009] [Accepted: 01/08/2010] [Indexed: 02/07/2023]
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92
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Vuorinen E, Hakkarainen M. Method development for the analysis of biodegradable polymers. INTERNATIONAL JOURNAL OF METROLOGY AND QUALITY ENGINEERING 2010. [DOI: 10.1051/ijmqe/2010008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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93
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Ohsawa S, Morino K, Sudo A, Endo T. Alternating Copolymerization of Bicyclic Bis(γ-butyrolactone) and Epoxide through Zwitterion Process by Phosphines. Macromolecules 2010. [DOI: 10.1021/ma1001244] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sousuke Ohsawa
- Molecular Engineering Institute, Kinki University, Kayanomori, Iizuka, Fukuoka 820-8555, Japan
| | - Kazuhide Morino
- Molecular Engineering Institute, Kinki University, Kayanomori, Iizuka, Fukuoka 820-8555, Japan
| | - Atsushi Sudo
- Molecular Engineering Institute, Kinki University, Kayanomori, Iizuka, Fukuoka 820-8555, Japan
| | - Takeshi Endo
- Molecular Engineering Institute, Kinki University, Kayanomori, Iizuka, Fukuoka 820-8555, Japan
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94
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Andersson SR, Hakkarainen M, Inkinen S, Södergård A, Albertsson AC. Polylactide Stereocomplexation Leads to Higher Hydrolytic Stability but More Acidic Hydrolysis Product Pattern. Biomacromolecules 2010; 11:1067-73. [DOI: 10.1021/bm100029t] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Sofia Regnell Andersson
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology (KTH), S-100 44, Stockholm, Sweden, and Tate & Lyle Finland Oy, Tykistökatu 4D, 20520 Turku, Finland
| | - Minna Hakkarainen
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology (KTH), S-100 44, Stockholm, Sweden, and Tate & Lyle Finland Oy, Tykistökatu 4D, 20520 Turku, Finland
| | - Saara Inkinen
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology (KTH), S-100 44, Stockholm, Sweden, and Tate & Lyle Finland Oy, Tykistökatu 4D, 20520 Turku, Finland
| | - Anders Södergård
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology (KTH), S-100 44, Stockholm, Sweden, and Tate & Lyle Finland Oy, Tykistökatu 4D, 20520 Turku, Finland
| | - Ann-Christine Albertsson
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology (KTH), S-100 44, Stockholm, Sweden, and Tate & Lyle Finland Oy, Tykistökatu 4D, 20520 Turku, Finland
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95
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Dong Y, Yong T, Liao S, Chan CK, Stevens MM, Ramakrishna S. Distinctive degradation behaviors of electrospun polyglycolide, poly(DL-lactide-co-glycolide), and poly(L-lactide-co-epsilon-caprolactone) nanofibers cultured with/without porcine smooth muscle cells. Tissue Eng Part A 2010; 16:283-98. [PMID: 19839726 DOI: 10.1089/ten.tea.2008.0537] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Biodegradable nanofibers have become a popular candidate for tissue engineering scaffolds because of their biomimetic structure that physically resembles the extracellular matrix. For certain tissue regeneration applications, prolonged in vitro culture time for cellular reorganization and tissue remodeling may be required. Therefore, extensive understanding of cellular effects on scaffold degradation is needed. There are only few studies on the degradation of nanofibers, and also the studies on degradation throughout cell culture are rare. In this study, polyglycolide (PGA), poly(DL-lactide-co-glycolide) (PLGA) and poly(L-lactide-co-epsilon-caprolactone) [P(LLA-CL)] were electrospun into nanofibrous meshes. The nanofibers were cultured with porcine smooth muscle cells for up to 3 months to evaluate their degradation behavior and cellular response. The results showed that the degradation rates are in the order of PGA >> PLGA > P(LLA-CL). PGA nanofibers degraded in 3 weeks and supported cell growth only in the first few days. PLGA nanofiber scaffolds facilitated cell growth during the first 30 days after seeding, but cell growth was slow thereafter. P(LLA-CL) nanofibers facilitated long-term (1-3 months) cell growth. mRNA quantification using real-time polymerase chain reaction revealed that some smooth muscle cell markers (alpha-actinin and calponin) and extracellular matrix genes (collagen and integrin) seemed to be downregulated with increased cell culture time. Cell culture significantly increased the degradation rate of PGA nanofibers, whereas the effect on PLGA and P(LLA-CL) nanofibers was limited. We found that the molecular weight of P(LLA-CL) and PLGA nanofibers decreased linearly for up to 100 days. Half lives of PLGA and P(LLA-CL) nanofibers were shown to be 80 and 110 days, respectively. In summary, this is the first study to our knowledge to evaluate long-term polymeric nanofiber degradation in vitro with cell culture. Cell culture accelerated the nanofibrous scaffold degradation to a limited extent. P(LLA-CL) nanofibers could be a good choice as scaffolds for long-term smooth muscle cell culture.
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Affiliation(s)
- Yixiang Dong
- Division of Bioengineering, National University of Singapore, Singapore, Singapore
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96
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Haushey LA, Bolzinger MA, Fessi H, Briançon S. rhEGF microsphere formulation andin vitroskin evaluation. J Microencapsul 2010; 27:14-24. [DOI: 10.3109/02652040902749061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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97
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Höglund A, Hakkarainen M, Edlund U, Albertsson AC. Surface modification changes the degradation process and degradation product pattern of polylactide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:378-383. [PMID: 20038176 DOI: 10.1021/la902166j] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The effect of surface modification on the degradation process and degradation product patterns of degradable polymers is still a basically unexplored area even though a significant effect can be expected. Polylactide (PLA) and PLA grafted with acrylic acid (PLA-AA) were, thus, subjected to hydrolytic degradation, and water-soluble degradation products were determined by electrospray ionization-mass spectrometry (ESI-MS) after different time periods. Low molar mass compounds migrated from surface-grafted PLA already during the first 7 days at 37 degrees C, while it took 133 days in the case of nongrafted PLA before any low molar mass compounds were detected in the aging water. In addition, the degradation product pattern of surface-grafted PLA showed significant variation as a function of hydrolysis time with the evolution of short and long AA-grafted lactic acid oligomers as well as plain lactic acid oligomers after different time periods. The degradation product pattern of plain PLA consisted of lactic acid and its oligomers with up to 13 lactic acid units. Surface grafting, thus, changed the degradation product patterns and accelerated the formation of water-soluble degradation products.
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Affiliation(s)
- Anders Höglund
- Department of Fibre and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology (KTH), S-100 44, Stockholm, Sweden
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98
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Zhu A, Diao H, Rong Q, Cai A. Preparation and properties of polylactide-silica nanocomposites. J Appl Polym Sci 2010. [DOI: 10.1002/app.31786] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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99
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Wen X, Lin Y, Han C, Zhang K, Ran X, Li Y, Dong L. Thermomechanical and optical properties of biodegradable poly(L-lactide)/silica nanocomposites by melt compounding. J Appl Polym Sci 2009. [DOI: 10.1002/app.30896] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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100
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Dong Y, Liao S, Ngiam M, Chan CK, Ramakrishna S. Degradation behaviors of electrospun resorbable polyester nanofibers. TISSUE ENGINEERING PART B-REVIEWS 2009; 15:333-51. [PMID: 19459780 DOI: 10.1089/ten.teb.2008.0619] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Biodegradable materials are widely used in the biomedical field because there is no postoperative surgery after implantation. Widely used synthetic biodegradable materials are polyesters, especially those used in tissue engineering. Advances in the tissue engineering field have brought much attention in terms of scaffold fabrication, such as with biodegradable polyester nanofibers. The rationale for using nanofibers for tissue engineering is that the nonwoven polymeric meshwork is a close representation of the nanoscale protein fiber meshwork in native extracellular matrix (ECM). Electrospinning technique is a promising way to fabricate controllable continuous nanofiber scaffold mimicking the ECM structure. Electrospun nanofibers provide high surface-to-volume ratio and high porosity as a promising scaffold for tissue engineering. Because the degradation behaviors of scaffolds significantly affect new tissue regeneration, the degradation of the material becomes one of the crucial factors when considering using polyester nanofibers as scaffolds in tissue engineering. In this review paper, we focus on the degradation studies of several bioresorbable polyester nanofibrous scaffolds used in tissue engineering. The degradable properties of nanofibers were compared with the corresponding degradable materials in macroscale. The factors that might affect the degradation behaviors were analyzed.
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Affiliation(s)
- Yixiang Dong
- Division of Bioengineering, Faculty of Engineering, National University of Singapore, Singapore
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