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Havlickova K, Kuzelova Kostakova E, Lisnenko M, Hauzerova S, Stuchlik M, Vrchovecka S, Vistejnova L, Molacek J, Lukas D, Prochazkova R, Horakova J, Jakubkova S, Heczkova B, Jencova V. The Impacts of the Sterilization Method and the Electrospinning Conditions of Nanofibrous Biodegradable Layers on Their Degradation and Hemocompatibility Behavior. Polymers (Basel) 2024; 16:1029. [PMID: 38674949 PMCID: PMC11053452 DOI: 10.3390/polym16081029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 03/26/2024] [Accepted: 04/04/2024] [Indexed: 04/28/2024] Open
Abstract
The use of electrospun polymeric biodegradable materials for medical applications is becoming increasingly widespread. One of the most important parameters regarding the functionality of nanofiber scaffolds during implantation and the subsequent regeneration of damaged tissues concerns their stability and degradation behavior, both of which are influenced by a wide range of factors (the properties of the polymer and the polymer solution, the technological processing approach, the sterilization method, etc.). This study monitored the degradation of nanofibrous materials fabricated from degradable polyesters as a result of the sterilization method applied (ethylene oxide and gamma irradiation) and the solvent system used to prepare the spun polymer solution. Aliphatic polyesters PCL and PLCL were chosen for this study and selected with respect to the applicability and handling in the surgical setting of these nanofibrous materials for vascular bandaging. The results revealed that the choice of solvent system exerts a significant impact on degradation during sterilization, especially at higher gamma irradiation values. The subsequent enzyme-catalyzed degradation of the materials following sterilization indicated that the choice of the sterilization method influenced the degradation behavior of the materials. Whereas wave-like degradation was evident concerning ethylene oxide sterilization, no such behavior was observed following gamma-irradiation sterilization. With concern for some of the tested materials, the results also indicated the potential for influencing the development of degradation within the bulk versus degradation from the surface of the material. Both the sterilization method and the choice of the spinning solvent system were found to impact degradation, which was observed to be most accelerated in the case of PLCL (L-lactide-co-caprolactone copolymer) electrospun from organic acids and subsequently sterilized using gamma irradiation. Since we planned to use these materials in cardiovascular applications, it was decided that their hemocompatibility would also be tested. The results of these tests revealed that changes in the structures of the materials initiated by sterilization may exert thrombogenic and anticoagulant impacts. Moreover, the microscopic analysis suggested that the solvent system used in the preparation of the materials potentially affects the behavior of erythrocytes; however, no indication of the occurrence of hemolysis was detected.
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Affiliation(s)
- Kristyna Havlickova
- Department of Chemistry, Faculty of Science, Humanities and Education, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic; (M.L.); (S.H.); (D.L.); (V.J.)
| | - Eva Kuzelova Kostakova
- Department of Chemistry, Faculty of Science, Humanities and Education, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic; (M.L.); (S.H.); (D.L.); (V.J.)
| | - Maxim Lisnenko
- Department of Chemistry, Faculty of Science, Humanities and Education, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic; (M.L.); (S.H.); (D.L.); (V.J.)
| | - Sarka Hauzerova
- Department of Chemistry, Faculty of Science, Humanities and Education, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic; (M.L.); (S.H.); (D.L.); (V.J.)
| | - Martin Stuchlik
- Institute for Nanomaterials, Advanced Technology and Innovation, Technical University of Liberec, Bendlova 1409/7, 46117 Liberec, Czech Republic; (M.S.); (S.V.)
| | - Stanislava Vrchovecka
- Institute for Nanomaterials, Advanced Technology and Innovation, Technical University of Liberec, Bendlova 1409/7, 46117 Liberec, Czech Republic; (M.S.); (S.V.)
| | - Lucie Vistejnova
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 1655/76, 32300 Pilsen, Czech Republic; (L.V.); (J.M.)
| | - Jiri Molacek
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 1655/76, 32300 Pilsen, Czech Republic; (L.V.); (J.M.)
- Department of Surgery, Faculty of Medicine in Pilsen, Charles University, Alej Svobody 80, 32300 Pilsen, Czech Republic
| | - David Lukas
- Department of Chemistry, Faculty of Science, Humanities and Education, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic; (M.L.); (S.H.); (D.L.); (V.J.)
| | - Renata Prochazkova
- Regional Hospital Liberec, Husova 357/28, 46001 Liberec, Czech Republic; (R.P.); (S.J.); (B.H.)
- Institute of Clinical Disciplines and Biomedicine, Faculty of Health Studies, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic
| | - Jana Horakova
- Department of Nonwovens and Nanofibrous Materials, Faculty of Textile Engineering, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic;
| | - Sarka Jakubkova
- Regional Hospital Liberec, Husova 357/28, 46001 Liberec, Czech Republic; (R.P.); (S.J.); (B.H.)
| | - Bohdana Heczkova
- Regional Hospital Liberec, Husova 357/28, 46001 Liberec, Czech Republic; (R.P.); (S.J.); (B.H.)
| | - Vera Jencova
- Department of Chemistry, Faculty of Science, Humanities and Education, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech Republic; (M.L.); (S.H.); (D.L.); (V.J.)
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Legett SA, Stockdale JR, Torres X, Yeager CM, Pacheco A, Labouriau A. Functional Filaments: Creating and Degrading pH-Indicating PLA Filaments for 3D Printing. Polymers (Basel) 2023; 15:polym15020436. [PMID: 36679315 PMCID: PMC9866878 DOI: 10.3390/polym15020436] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 01/06/2023] [Accepted: 01/10/2023] [Indexed: 01/19/2023] Open
Abstract
With the rapid pace of advancements in additive manufacturing and techniques such as fused filament fabrication (FFF), the feedstocks used in these techniques should advance as well. While available filaments can be used to print highly customizable parts, the creation of the end part is often the only function of a given feedstock. In this study, novel FFF filaments with inherent environmental sensing functionalities were created by melt-blending poly(lactic acid) (PLA), poly(ethylene glycol) (PEG), and pH indicator powders (bromothymol blue, phenolphthalein, and thymol blue). The new PLA-PEG-indicator filaments were universally more crystalline than the PLA-only filaments (33-41% vs. 19% crystallinity), but changes in thermal stability and mechanical characteristics depended upon the indicator used; filaments containing bromothymol blue and thymol blue were more thermally stable, had higher tensile strength, and were less ductile than PLA-only filaments, while filaments containing phenolphthalein were less thermally stable, had lower tensile strength, and were more ductile. When the indicator-filled filaments were exposed to acidic, neutral, and basic solutions, all filaments functioned as effective pH sensors, though the bromothymol blue-containing filament was only successful as a base indicator. The biodegradability of the new filaments was evaluated by characterizing filament samples after aging in soil and soil slurry mixtures; the amount of physical deterioration and changes in filament crystallinity suggested that the bromothymol blue filament degraded faster than PLA-only filaments, while the phenolphthalein and thymol blue filaments saw decreases in degradation rates.
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Fedorenko AA, Grinyuk EV, Salnikova IA, Kostjuk SV. Effect of gamma-irradiation on hydrolysis of commercial poly(L-lactide) at elevated temperature. Polym Degrad Stab 2022. [DOI: 10.1016/j.polymdegradstab.2022.110202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Amza CG, Zapciu A, Baciu F, Vasile MI, Popescu D. Aging of 3D Printed Polymers under Sterilizing UV-C Radiation. Polymers (Basel) 2021; 13:4467. [PMID: 34961017 PMCID: PMC8709156 DOI: 10.3390/polym13244467] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/12/2021] [Accepted: 12/17/2021] [Indexed: 12/31/2022] Open
Abstract
In the context of the COVID-19 pandemic, shortwave ultraviolet radiation with wavelengths between 200 nm and 280 nm (UV-C) is seeing increased usage in the sterilization of medical equipment, appliances, and spaces due to its antimicrobial effect. During the first weeks of the pandemic, healthcare facilities experienced a shortage of personal protective equipment. This led to hospital technicians, private companies, and even members of the public to resort to 3D printing in order to produce fast, on-demand resources. This paper analyzes the effect of accelerated aging through prolonged exposure to UV-C on mechanical properties of parts 3D printed by material extrusion (MEX) from common polymers, such as polylactic acid (PLA) and polyethylene terephthalate-glycol (PETG). Samples 3D printed from these materials went through a 24-h UV-C exposure aging cycle and were then tested versus a control group for changes in mechanical properties. Both tensile and compressive strength were determined, as well as changes in material creep properties. Prolonged UV-C exposure reduced the mechanical properties of PLA by 6-8% and of PETG by over 30%. These findings are of practical importance for those interested in producing functional MEX parts intended to be sterilized using UV-C. Scanning electron microscopy (SEM) was performed in order to assess any changes in material structure.
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Affiliation(s)
- Catalin Gheorghe Amza
- Department of Quality Engineering and Industrial Technologies, Faculty of Industrial Engineering and Robotics, University Politehnica of Bucharest, 060042 Bucharest, Romania;
| | - Aurelian Zapciu
- Department of Robotics and Production Systems, Faculty of Industrial Engineering and Robotics, University Politehnica of Bucharest, 060042 Bucharest, Romania; (A.Z.); (D.P.)
| | - Florin Baciu
- Department of Strength Materials, Faculty of Industrial Engineering and Robotics, University Politehnica of Bucharest, 060042 Bucharest, Romania;
| | - Mihai Ion Vasile
- Department of Quality Engineering and Industrial Technologies, Faculty of Industrial Engineering and Robotics, University Politehnica of Bucharest, 060042 Bucharest, Romania;
| | - Diana Popescu
- Department of Robotics and Production Systems, Faculty of Industrial Engineering and Robotics, University Politehnica of Bucharest, 060042 Bucharest, Romania; (A.Z.); (D.P.)
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Glycidyl methacrylate functionalized star-shaped polylactide for electron beam modification of polylactic acid: Synthesis, irradiation effects and microwave-resistant studies. Polym Degrad Stab 2021. [DOI: 10.1016/j.polymdegradstab.2021.109619] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Przybysz-Romatowska M, Haponiuk J, Formela K. Reactive extrusion of biodegradable aliphatic polyesters in the presence of free-radical-initiators: A review. Polym Degrad Stab 2020. [DOI: 10.1016/j.polymdegradstab.2020.109383] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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Electron Beam Induced Tailoring of Electrical Characteristics of Organic Semiconductor Films. CHEMISTRY AFRICA-A JOURNAL OF THE TUNISIAN CHEMICAL SOCIETY 2020. [DOI: 10.1007/s42250-020-00168-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Yusof MR, Shamsudin R, Zakaria S, Azmi Abdul Hamid M, Yalcinkaya F, Abdullah Y, Yacob N. Electron-Beam Irradiation of the PLLA/CMS/β-TCP Composite Nanofibers Obtained by Electrospinning. Polymers (Basel) 2020; 12:polym12071593. [PMID: 32709111 PMCID: PMC7408529 DOI: 10.3390/polym12071593] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 07/15/2020] [Accepted: 07/15/2020] [Indexed: 11/16/2022] Open
Abstract
Nanofibrous materials produced by electrospinning processes have potential advantages in tissue engineering because of their biocompatibility, biodegradability, biomimetic architecture, and excellent mechanical properties. The aim of the current work is to study the influence of the electron beam on the poly L-lactide acid/ carboxy-methyl starch/β-tricalcium phosphate (PLLA/CMS/β-TCP) composite nanofibers for potential applications as bone-tissue scaffolds. The composite nanofibers were prepared by electrospinning in the combination of 5% v/v carboxy-methyl starch (CMS) and 0.25 wt% of β-TCP with the PLLA as a matrix component. The composites nanofibers were exposed under 5, 30, and 100 kGy of irradiation dose. The electron-beam irradiation showed no morphological damage to the fibers, and slight reduction in the water-contact angle and mechanical strength at the higher-irradiation doses. The chain scission was found to be a dominant effect; the higher doses of electron-beam irradiation thus increased the in vitro degradation rate of the composite nanofibers. The chemical interaction due to irradiation was indicated by the Fourier transform infrared (FTIR) spectrum and thermal behavior was investigated by a differential scanning calorimeter (DSC). The results showed that the electron-beam-induced poly L-lactide acid/carboxy-methyl starch/β-tricalcium phosphate (PLLA/CMS/β-TCP) composite nanofibers may have great potential for bone-tissue engineering.
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Affiliation(s)
- Mohd Reusmaazran Yusof
- Faculty of Sciences and Technology, National University of Malaysia, Bandar Baru Bangi, 43600 Selangor, Malaysia; (R.S.); (S.Z.); (N.Y.)
- Correspondence: (M.R.Y.); (M.A.A.H.); (F.Y.); Tel.: +60-03-89213404 (M.R.Y.)
| | - Roslinda Shamsudin
- Faculty of Sciences and Technology, National University of Malaysia, Bandar Baru Bangi, 43600 Selangor, Malaysia; (R.S.); (S.Z.); (N.Y.)
| | - Sarani Zakaria
- Faculty of Sciences and Technology, National University of Malaysia, Bandar Baru Bangi, 43600 Selangor, Malaysia; (R.S.); (S.Z.); (N.Y.)
| | - Muhammad Azmi Abdul Hamid
- Faculty of Sciences and Technology, National University of Malaysia, Bandar Baru Bangi, 43600 Selangor, Malaysia; (R.S.); (S.Z.); (N.Y.)
- Correspondence: (M.R.Y.); (M.A.A.H.); (F.Y.); Tel.: +60-03-89213404 (M.R.Y.)
| | - Fatma Yalcinkaya
- Institute for Nanomaterials, Advanced Technology and Innovation, Technical University of Liberec, Studentska 1402/2, 46117 Liberec, Czech Republic
- Correspondence: (M.R.Y.); (M.A.A.H.); (F.Y.); Tel.: +60-03-89213404 (M.R.Y.)
| | - Yusof Abdullah
- Material Technology Group, Malaysian Nuclear Agency, Bangi, Kajang, 43300 Selangor, Malaysia;
| | - Norzita Yacob
- Faculty of Sciences and Technology, National University of Malaysia, Bandar Baru Bangi, 43600 Selangor, Malaysia; (R.S.); (S.Z.); (N.Y.)
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Halligan S, Murray K, Hopkins M, Rogers I, Lyons J, Vrain O, Geever L. Enhancing and controlling the critical attributes of poly (
N
‐vinylcaprolactam) through electron beam irradiation for biomedical applications. J Appl Polym Sci 2020. [DOI: 10.1002/app.48639] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Shane Halligan
- Applied Polymer Technologies GatewayMaterials Research Institute, Athlone Institute of Technology Ireland
| | | | - Michael Hopkins
- Applied Polymer Technologies GatewayMaterials Research Institute, Athlone Institute of Technology Ireland
| | - Ian Rogers
- Applied Polymer Technologies GatewayMaterials Research Institute, Athlone Institute of Technology Ireland
| | - John Lyons
- Applied Polymer Technologies GatewayMaterials Research Institute, Athlone Institute of Technology Ireland
| | | | - Luke Geever
- Applied Polymer Technologies GatewayMaterials Research Institute, Athlone Institute of Technology Ireland
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Krul’ LP, Butovskaya GV, Fedorenko AA, Roginets LP, Sal’nikova IA. Gamma- and Electron Beam Radiation-Induced Degradation of Poly-L-Lactide. HIGH ENERGY CHEMISTRY 2020. [DOI: 10.1134/s0018143920020125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Design and Characterization of Injectable Poly(Lactic-Co-Glycolic Acid) Pastes for Sustained and Local Drug Release. Pharm Res 2020; 37:36. [PMID: 31965346 DOI: 10.1007/s11095-019-2730-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 10/31/2019] [Indexed: 01/09/2023]
Abstract
PURPOSE We describe the preparation of injectable polymeric paste (IPP) formulations for local and sustained release of drugs. Furthermore, we include the characterization and possible applications of such pastes. Particular attention is paid to characteristics relevant to the successful clinical formulation development, such as viscosity, injectability, degradation, drug release, sterilization, stability performance and pharmacokinetics. METHODS Paste injectability was characterized using measured viscosity and the Hagen-Poiseuille equation to determine injection forces. Drug degradation, release and formulation stability experiments were performed in vitro and drug levels were quantified using HPLC-UV methods. Pharmacokinetic evaluation of sustained-release lidocaine IPPs used five groups of six rats receiving increasing doses subcutaneously. An anti-cancer formulation was evaluated in a subcutaneous tumor xenograft mouse model. RESULTS The viscosity and injectability of IPPs could be controlled by changing the polymeric composition. IPPs demonstrated good long-term stability and tunable drug-release with low systemic exposure in vivo in rats. Preliminary data in a subcutaneous tumor model points to a sustained anticancer effect. CONCLUSIONS These IPPs are tunable platforms for local and sustained delivery of drugs and have potential for further clinical development to treat a number of diseases.
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Haim Zada M, Kumar A, Elmalak O, Mechrez G, Domb AJ. Effect of Ethylene Oxide and Gamma (γ-) Sterilization on the Properties of a PLCL Polymer Material in Balloon Implants. ACS OMEGA 2019; 4:21319-21326. [PMID: 31867526 PMCID: PMC6921626 DOI: 10.1021/acsomega.9b02889] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 11/19/2019] [Indexed: 06/10/2023]
Abstract
Poly-l-lactide-co-ε-caprolactone (PLCL) is a unique polymer containing both polylactic acid and poly-ε-caprolactone (PCL) chain units, and thus it has better flexible and biodegradable properties. Based on these unique properties of PLCL, we have developed balloons that are now widely used in treating major medical problems [Biomaterials 2016, 105, 109-116]. One of the most important considerations needed for balloons is to ensure that the material properties remain similar after undergoing ethylene oxide (EtO) or gamma (γ-) sterilization treatments. From the biotechnological point of view, we focused on analyzing the vital molecular properties of the PLCL material after sterilization, such as changes in crystallinity, molecular weight distributions (M w, M n, and polydispersity index), and inherent viscosity (η). Analysis of the data reveals that EtO sterilization does not engender any change in crystallinity, melting temperature (T m), molecular weights, and η of the polymer. On the contrary, γ-radiations induce chain scission and consequential decrease of ∼33 and ∼15% in molecular weights and η values, respectively. Based on our observations, we recommend EtO sterilization instead of γ-radiation for PLCL. This ensures prolonged stability of the polymer against degradation in a biological environment, long-shelf life, and absolute assurance that balloon failures do not occur after implantation.
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Affiliation(s)
- Moran Haim Zada
- Institute
of Drug Research, Alex Grass Center for Drug Design and Novel Therapeutics,
School of Pharmacy-Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Awanish Kumar
- Institute
of Drug Research, Alex Grass Center for Drug Design and Novel Therapeutics,
School of Pharmacy-Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Omar Elmalak
- Institute
of Drug Research, Alex Grass Center for Drug Design and Novel Therapeutics,
School of Pharmacy-Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
| | - Guy Mechrez
- Department
of Food Quality and Safety, Institute for Postharvest and Food Sciences,
Volcani Center, ARO, 68 HaMaccabim Road, Rishon
LeZion 7505101, Israel
| | - Abraham J. Domb
- Institute
of Drug Research, Alex Grass Center for Drug Design and Novel Therapeutics,
School of Pharmacy-Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 91120, Israel
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Palmer I, Clarke SA, Buchanan FJ. Enhanced release of calcium phosphate additives from bioresorbable orthopaedic devices using irradiation technology is non-beneficial in a rabbit model: An animal study. Bone Joint Res 2019; 8:266-274. [PMID: 31346455 PMCID: PMC6609887 DOI: 10.1302/2046-3758.86.bjr-2018-0224.r2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Objectives Bioresorbable orthopaedic devices with calcium phosphate (CaP) fillers are commercially available on the assumption that increased calcium (Ca) locally drives new bone formation, but the clinical benefits are unknown. Electron beam (EB) irradiation of polymer devices has been shown to enhance the release of Ca. The aims of this study were to: 1) establish the biological safety of EB surface-modified bioresorbable devices; 2) test the release kinetics of CaP from a polymer device; and 3) establish any subsequent beneficial effects on bone repair in vivo. Methods ActivaScrew Interference (Bioretec Ltd, Tampere, Finland) and poly(L-lactide-co-glycolide) (PLGA) orthopaedic screws containing 10 wt% β-tricalcium phosphate (β-TCP) underwent EB treatment. In vitro degradation over 36 weeks was investigated by recording mass loss, pH change, and Ca release. Implant performance was investigated in vivo over 36 weeks using a lapine femoral condyle model. Bone growth and osteoclast activity were assessed by histology and enzyme histochemistry. Results Calcium release doubled in the EB-treated group before returning to a level seen in untreated samples at 28 weeks. Extensive bone growth was observed around the perimeter of all implant types, along with limited osteoclastic activity. No statistically significant differences between comparative groups was identified. Conclusion The higher than normal dose of EB used for surface modification did not adversely affect tissue response around implants in vivo. Surprisingly, incorporation of β-TCP and the subsequent accelerated release of Ca had no significant effect on in vivo implant performance, calling into question the clinical evidence base for these commercially available devices. Cite this article: I. Palmer, S. A. Clarke, F. J Buchanan. Enhanced release of calcium phosphate additives from bioresorbable orthopaedic devices using irradiation technology is non-beneficial in a rabbit model: An animal study. Bone Joint Res 2019;8:266–274. DOI: 10.1302/2046-3758.86.BJR-2018-0224.R2.
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Affiliation(s)
- I Palmer
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, Cardiff, UK
| | - S A Clarke
- School of Nursing and Midwifery, Medical Biology Centre, Queen's University Belfast, Belfast, UK
| | - F J Buchanan
- School of Mechanical and Aerospace Engineering, Ashby Building, Queen's University Belfast, Belfast, UK
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Electron beam treatment of polylactide at elevated temperature in nitrogen atmosphere. Radiat Phys Chem Oxf Engl 1993 2019. [DOI: 10.1016/j.radphyschem.2019.02.053] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Synthesis of Poly(lactic acid)-block-poly(N,N-dimethylaminoethyl methacrylate) Copolymers with Controllable Block Structures via Reversible Addition Fragmentation Polymerization from Aminolyzed Poly(lactic acid). INT J POLYM SCI 2018. [DOI: 10.1155/2018/7361659] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Poly(lactic acid)-block-poly(N,N-dimethylaminoethyl methacrylate) (PLA-PDMAEMA) copolymers were synthesized from aminolyzed PLA via reversible addition fragmentation (RAFT) polymerization. PLA undergoes aminolytic degradation with ethylenediamine (EDA). The kinetics of the aminolysis reaction of PLA at different temperatures and EDA concentrations was investigated in detail. The molar masses of products rapidly decreased in the initial stage at low aminolytic degree. Meanwhile, reactive –NH2 and –OH groups were introduced to the end of shorter PLA chains and used as sites to further immobilize the RAFT agent. PLA-PDMAEMA block copolymers were synthesized. A pseudo-first-order reaction kinetics was observed for the RAFT polymerization of PDMAEMA at a low conversion. By controlling the aminolysis reaction of PLA and RAFT polymerization degree of DMAEMA, the length distributions of the PLA and PDMAEMA blocks can be controlled. This method can be extended to more systems to obtain block copolymers with controllable block structure.
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The Influence of Pulsed Electron Beam Treatment on Properties of PLLA Nonwoven Materials Produced by Solution Blow Spinning. BIONANOSCIENCE 2017. [DOI: 10.1007/s12668-017-0436-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Compatibility confirmation and refinement of thermal and mechanical properties of poly (lactic acid)/poly (ethylene- co -glycidyl methacrylate) blend reinforced by hexagonal boron nitride. REACT FUNCT POLYM 2017. [DOI: 10.1016/j.reactfunctpolym.2017.05.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Demina TS, Gilman AB, Zelenetskii AN. Application of high-energy chemistry methods to the modification of the structure and properties of polylactide (a review). HIGH ENERGY CHEMISTRY 2017. [DOI: 10.1134/s0018143917040038] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Karamanlioglu M, Preziosi R, Robson GD. Abiotic and biotic environmental degradation of the bioplastic polymer poly(lactic acid): A review. Polym Degrad Stab 2017. [DOI: 10.1016/j.polymdegradstab.2017.01.009] [Citation(s) in RCA: 249] [Impact Index Per Article: 35.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Effects of electron beam irradiation on thermal and mechanical properties of poly(lactic acid) films. Polym Degrad Stab 2016. [DOI: 10.1016/j.polymdegradstab.2016.09.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Zembouai I, Kaci M, Bruzaud S, Pillin I, Audic JL, Shayanfar S, Pillai SD. Electron beam radiation effects on properties and ecotoxicity of PHBV/PLA blends in presence of organo-modified montmorillonite. Polym Degrad Stab 2016. [DOI: 10.1016/j.polymdegradstab.2016.03.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Julien J, Quantin JC, Bénézet JC, Bergeret A, Lacrampe M, Krawczak P. Chemical foaming extrusion of poly(lactic acid) with chain-extenders: Physical and morphological characterizations. Eur Polym J 2015. [DOI: 10.1016/j.eurpolymj.2015.03.011] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Huang YF, Xu JZ, Xu JY, Zhang ZC, Hsiao BS, Xu L, Li ZM. Self-reinforced polyethylene blend for artificial joint application. J Mater Chem B 2014; 2:971-980. [DOI: 10.1039/c3tb21231a] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Arias V, Höglund A, Odelius K, Albertsson AC. Tuning the degradation profiles of poly(L-lactide)-based materials through miscibility. Biomacromolecules 2013; 15:391-402. [PMID: 24279455 PMCID: PMC3892759 DOI: 10.1021/bm401667b] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
The effective use of biodegradable polymers relies on the ability to control the onset of and time needed for degradation. Preferably, the material properties should be retained throughout the intended time frame, and the material should degrade in a rapid and controlled manner afterward. The degradation profiles of polyester materials were controlled through their miscibility. Systems composed of PLLA blended with poly[(R,S)-3-hydroxybutyrate] (a-PHB) and polypropylene adipate (PPA) with various molar masses were prepared through extrusion. Three different systems were used: miscible (PLLA/a-PHB5 and PLLA/a-PHB20), partially miscible (PLLA/PPA5/comp and PLLA/PPA20/comp), and immiscible (PLLA/PPA5 and PLLA/PPA20) blends. These blends and their respective homopolymers were hydrolytically degraded in water at 37 °C for up to 1 year. The blends exhibited entirely different degradation profiles but showed no diversity between the total degradation times of the materials. PLLA presented a two-stage degradation profile with a rapid decrease in molar mass during the early stages of degradation, similar to the profile of PLLA/a-PHB5. PLLA/a-PHB20 presented a single, constant linear degradation profile. PLLA/PPA5 and PLLA/PPA20 showed completely opposing degradation profiles relative to PLLA, exhibiting a slow initial phase and a rapid decrease after a prolonged degradation time. PLLA/PPA5/comp and PLLA/PPA20/comp had degradation profiles between those of the miscible and the immiscible blends. The molar masses of the materials were approximately the same after 1 year of degradation despite their different profiles. The blend composition and topographical images captured at the last degradation time point demonstrate that the blending component was not leached out during the period of study. The hydrolytic stability of degradable polyester materials can be tailored to obtain different and predetermined degradation profiles for future applications.
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Affiliation(s)
- Veluska Arias
- Department of Fiber and Polymer Technology, KTH Royal Institute of Technology , SE-100 44 Stockholm, Sweden
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Current application of controlled degradation processes in polymer modification and functionalization. J Appl Polym Sci 2013. [DOI: 10.1002/app.39006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Fang H, Zhang Y, Bai J, Wang Z, Wang Z. Bimodal architecture and rheological and foaming properties for gamma-irradiated long-chain branched polylactides. RSC Adv 2013. [DOI: 10.1039/c3ra40879e] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Wach RA, Adamus A, Olejnik AK, Dzierzawska J, Rosiak JM. Nerve guidance channels based on PLLA-PTMC biomaterial. J Appl Polym Sci 2012. [DOI: 10.1002/app.37932] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Cairns ML, Dickson GR, Orr JF, Farrar D, Hardacre C, Sa J, Lemoine P, Mughal MZ, Buchanan FJ. The potential of electron beam radiation for simultaneous surface modification and bioresorption control of PLLA. J Biomed Mater Res A 2012; 100:2223-9. [PMID: 22829468 DOI: 10.1002/jbm.a.34156] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 02/28/2012] [Accepted: 03/01/2012] [Indexed: 11/06/2022]
Abstract
Bioresorbable polymers have been widely investigated as materials exhibiting significant potential for successful application in the fields of tissue engineering and drug delivery. Further to the ability to control degradation, surface engineering of polymers has been highlighted as a key method central to their development. Previous work has demonstrated the ability of electron beam (e-beam) technology to control the degradation profiles and bioresorption of a number of commercially relevant bioresorbable polymers (poly-l-lactic acid (PLLA), L-lactide/DL-lactide co-polymer (PLDL) and poly(lactic-co-glycolic acid (PLGA)). This work investigates the further potential of e-beam technology to impart added biofunctionality through the manipulation of polymer (PLLA) surface properties. PLLA samples were subjected to e-beam treatments in air, with varying beam energies and doses. Surface characterization was then performed using contact angle analysis, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and atomic force microscopy. Results demonstrated a significant increase in surface wettability post e-beam treatment. In correlation with this, XPS data showed the introduction of oxygen-containing functional groups to the surface of PLLA. Raman spectroscopy indicated chain scission in the near surface region of PLLA (as predicted). However, e-beam effects on surface properties were not shown to be dependent on beam energy or dose. E-beam irradiation did not seem to affect the surface roughness of PLLA as a direct consequence of the treatment.
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He C, Feng W, Cao L, Fan L. Crosslinking of poly(L-lactide) nanofibers with triallyl isocyanutrate by gamma-irradiation for tissue engineering application. J Biomed Mater Res A 2011; 99:655-65. [PMID: 21954125 DOI: 10.1002/jbm.a.33235] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Revised: 07/02/2011] [Accepted: 08/15/2011] [Indexed: 11/07/2022]
Abstract
The radiation crosslinked poly(L-lactide) (PLLA) electrospun nanofibers have been developed with improved thermal stability and mechanical properties. Trially isocyanurate (TAIC) were added into PLLA solution at different weight ratios (1, 3, and 5%) and electrospun into nanofibrous mats, the mats were then irradiated by gamma ray at different radiation doses (5, 10, and 25 kGy) to crosslink the PLLA chains. Their surface morphology, thermal properties, mechanical properties, and biodegradation properties were investigated and compared before and after gamma irradiation. Furthermore, the in vitro biocompatibilities were also evaluated by using mouse L929 fibroblasts. The results indicated that the efficient crosslinking networks can be generated when the TAIC content is higher than 3%. The thermal stability and tensile mechanical properties were significantly increased at higher irradiation dose of 10 and 25 kGy. However, radiation dose at 25 kGy have an adverse effect on the thermal stability of crosslinked samples due to thermal degradation induced by irradiation, the crosslinked samples irradiated at 10 kGy exhibited the best enzymatic degradation. The in vitro results also revealed that the crosslinked PLLA/TAIC composite nanofibers did not induce cytotoxic effects and are suitable for cell growth. Therefore, the crosslinked PLLA nanofibers are one of the promising materials for future tissue engineering applications.
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Affiliation(s)
- Chuanglong He
- State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai 201620, People's Republic of China.
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