1
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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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2
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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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3
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Tiwary P, Najafi N, Kontopoulou M. Advances in peroxide‐initiated graft modification of thermoplastic biopolyesters by reactive extrusion. CAN J CHEM ENG 2021. [DOI: 10.1002/cjce.24080] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Praphulla Tiwary
- Department of Chemical Engineering Queen's University Kingston Ontario Canada
| | - Naqi Najafi
- Department of Chemical Engineering Queen's University Kingston Ontario Canada
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4
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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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5
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Ekinci A, Gleadall A, Johnson AA, Li L, Han X. Mechanical and hydrolytic properties of thin polylactic acid films by fused filament fabrication. J Mech Behav Biomed Mater 2020; 114:104217. [PMID: 33246876 DOI: 10.1016/j.jmbbm.2020.104217] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 10/26/2020] [Accepted: 11/15/2020] [Indexed: 01/14/2023]
Abstract
Thin polymeric films are widely used as medical applications such as cell culture, stent, drug delivery and mechanical fixation. One of the most commonly used materials is polylactic acid (PLA) - a material, which is non-toxic, biodegradable and biocompatible. Fused filament fabrication (FFF) is a preferable additive manufacturing technique to manufacture polymers, where PLA is one of the most common materials. FFF is a promising technique for customised biomedical applications due to its relatively low cost and geometrical flexibility where biomedical applications are patient tailored. This study is the first to consider FFF monolayered thin films of PLA in terms of mechanical and hydrolytic properties at 37 °C in vitro degradation. Throughout degradation, the reduction in mechanical properties was examined by analysing molecular weight and thermal properties. FFF monolayered PLA underwent autocatalytic bulk degradation with no proof of significant mass loss. Young's modulus, ultimate tensile strength and molecular weight reduced by approximately 60%, 86%, and 80% after 280 days, respectively, while the degree of crystallinity increased by 143% in comparison to benchmark thin films at day 0. It was found that the decrease in mechanical properties was more sensitive to the increase in crystallinity in the early stage of the degradation, while the molecular weight was more dominant in the late stage of the degradation. This study provides practical information in terms of mechanical properties to support medical device designers in a range of potential end-use biomedical applications to achieve safe functional products over the required degradation lifetime.
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Affiliation(s)
- Alper Ekinci
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, LE11 3TU, UK
| | - Andy Gleadall
- Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Loughborough, LE11 3TU, UK
| | - Andrew A Johnson
- School of Design & Creative Arts, Loughborough University, Loughborough, LE11 3TU, UK
| | - Ling Li
- State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, 410082, China
| | - Xiaoxiao Han
- State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, 410082, China.
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6
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Iuliano A, Nowacka M, Rybak K, Rzepna M. The effects of electron beam radiation on material properties and degradation of commercial PBAT/PLA blend. J Appl Polym Sci 2020. [DOI: 10.1002/app.48462] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- A. Iuliano
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3, 00‐664 Warsaw Poland
- Department of Chemistry, Faculty of Food SciencesWarsaw University of Life Sciences—SGGW Nowoursynowska 159c, 02‐776 Warsaw Poland
| | - M. Nowacka
- Department of Food Engineering and Process Management, Faculty of Food SciencesWarsaw University of Life Sciences—SGGW Nowoursynowska st. 159c, 02‐776 Warsaw Poland
| | - K. Rybak
- Department of Food Engineering and Process Management, Faculty of Food SciencesWarsaw University of Life Sciences—SGGW Nowoursynowska st. 159c, 02‐776 Warsaw Poland
| | - M. Rzepna
- Institute of Nuclear Chemistry and Technology Dorodna 16 Warsaw 03‐195 Poland
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7
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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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8
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Dawidziuk K, Simmons H, Kontopoulou M, Parent JS. Peroxide-initiated graft modification of thermoplastic BioPolyesters: Introduction of long-chain branching. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.10.053] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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9
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Kharel S, Gautam A, Dickescheid A, Loo SCJ. Hollow Microparticles as a Superior Delivery System over Solid Microparticles for the Encapsulation of Peptides. Pharm Res 2018; 35:185. [PMID: 30073514 DOI: 10.1007/s11095-018-2461-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 07/15/2018] [Indexed: 12/27/2022]
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10
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Cingolani A, Casalini T, Caimi S, Klaue A, Sponchioni M, Rossi F, Perale G. A Methodologic Approach for the Selection of Bio-Resorbable Polymers in the Development of Medical Devices: The Case of Poly(l-lactide- co-ε-caprolactone). Polymers (Basel) 2018; 10:E851. [PMID: 30960776 PMCID: PMC6403915 DOI: 10.3390/polym10080851] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Revised: 07/23/2018] [Accepted: 07/31/2018] [Indexed: 11/16/2022] Open
Abstract
In the last decades bioresorbable and biodegradable polymers have gained a very good reputation both in research and in industry thanks to their unique characteristics. They are able to ensure high performance and biocompatibility, at the same time avoiding post-healing surgical interventions for device removal. In the medical device industry, it is widely known that product formulation and manufacturing need to follow specific procedures in order to ensure both the proper mechanical properties and desired degradation profile. Moreover, the sterilization method is crucial and its impact on physical properties is generally underestimated. In this work we focused our attention on the effect of different terminal sterilization methods on two commercially available poly(l-lactide-co-ε-caprolactone) with equivalent chemical composition (70% PLA and 30% PCL) and relatively similar initial molecular weights, but different chain arrangements and crystallinity. Results obtained show that crystallinity plays a key role in helping preserve the narrow distribution of chains and, as a consequence, defined physical properties. These statements can be used as guidelines for a better choice of the most adequate biodegradable polymers in the production of resorbable medical devices.
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Affiliation(s)
- Alberto Cingolani
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Bioscience ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zürich, Switzerland.
- Industrie Biomediche Insubri SA (IBI), Via Cantonale 67, 6805 Mezzovico-Vira, Switzerland.
| | - Tommaso Casalini
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Bioscience ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zürich, Switzerland.
- Biomaterials Laboratory, Institute for Mechanical Engineering and Materials Technology, SUPSI-University of Applied Sciences and Arts of Southern Switzerland, Via Cantonale 2C, Galleria 2, 6928 Manno, Switzerland.
| | - Stefano Caimi
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Bioscience ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zürich, Switzerland.
| | - Antoine Klaue
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Bioscience ETH Zurich, Vladimir-Prelog-Weg 1-5/10, 8093 Zürich, Switzerland.
| | - Mattia Sponchioni
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, 20100 Milan, Italy.
| | - Filippo Rossi
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, 20100 Milan, Italy.
| | - Giuseppe Perale
- Industrie Biomediche Insubri SA (IBI), Via Cantonale 67, 6805 Mezzovico-Vira, Switzerland.
- Biomaterials Laboratory, Institute for Mechanical Engineering and Materials Technology, SUPSI-University of Applied Sciences and Arts of Southern Switzerland, Via Cantonale 2C, Galleria 2, 6928 Manno, Switzerland.
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11
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Rzepna M, Przybytniak G, Sadło J. Radiation degradation and stability of PBAT: copolymer of aromatic and aliphatic esters. J Appl Polym Sci 2018. [DOI: 10.1002/app.46682] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Magdalena Rzepna
- Institute of Nuclear Chemistry and Technology; Dorodna 16, Warsaw 03-195 Poland
| | - Grażyna Przybytniak
- Institute of Nuclear Chemistry and Technology; Dorodna 16, Warsaw 03-195 Poland
| | - Jarosław Sadło
- Institute of Nuclear Chemistry and Technology; Dorodna 16, Warsaw 03-195 Poland
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12
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Malinowski R, Stepczyńska M, Raszkowska-Kaczor A, Żuk T. Some effects of foaming of the poly(butylene adipate-co
-terephthalate) modified by electron radiation. POLYM ADVAN TECHNOL 2017. [DOI: 10.1002/pat.4223] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Rafał Malinowski
- Institute for Engineering of Polymer Materials and Dyes; 87-100 Toruń Poland
| | - Magdalena Stepczyńska
- Department of Materials Engineering; Kazimierz Wielki University; 85-064 Bydgoszcz Poland
| | | | - Tomasz Żuk
- Institute for Engineering of Polymer Materials and Dyes; 87-100 Toruń Poland
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13
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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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14
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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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15
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Biodegradable polyester networks including hydrophilic groups favor BMSCs differentiation and can be eroded by macrophage action. Polym Degrad Stab 2016. [DOI: 10.1016/j.polymdegradstab.2016.05.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Araque-Monrós MC, Gamboa-Martínez TC, Santos LG, Bernabé SG, Pradas MM, Estellés JM. New concept for a regenerative and resorbable prosthesis for tendon and ligament: physicochemical and biological characterization of PLA-braided biomaterial. J Biomed Mater Res A 2013; 101:3228-37. [PMID: 23554342 DOI: 10.1002/jbm.a.34633] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Revised: 01/17/2013] [Accepted: 01/22/2013] [Indexed: 01/04/2023]
Abstract
We present a concept for a new regenerative and resorbable prosthesis for tendon and ligament and characterize the physicomechanical and biological behavior of one of its components, a hollow braid made of poly-lactide acid (PLA) which is the load-bearing part of the prosthesis concept. The prosthesis consists of a braid, microparticles in its interior serving as cell carriers, and a surface non-adherent coating, all these parts being made of biodegradable materials. The PLA braid has a nonlinear convex stress-strain behavior with a Young modulus of 1370 ± 90 MPa in the linear, stretched state, and after 12 months of hydrolytic degradation the modulus shows a reduction by a factor of four. Different disinfection methods were tested as to their efficiency in cleansing the braid and preparing it for cell culture. Fibroblasts of L929 line were grown on the PLA braid for 14 days, showing good adherence and proliferation. These studies validate the PLA braid for the intended purpose in the regenerative prosthesis concept.
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Affiliation(s)
- María C Araque-Monrós
- Centro de Biomateriales e Ingeniería Tisular, Universitat Politècnica de València, 46022, Valencia, Spain; CIBER en Bioingeniería, Biomateriales y Nanomedicina, (CIBER-BBN), Valencia, Spain
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17
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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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18
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Lee WL, Loo SCJ. Revolutionizing drug delivery through biodegradable multilayered particles. J Drug Target 2012; 20:633-47. [PMID: 22738195 DOI: 10.3109/1061186x.2012.702772] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Modern drug discovery technologies are discovering more and more potent therapeutic agents with narrow therapeutic windows, thus necessitating the improvement of current particulate drug delivery systems. Conventional single-layered polymeric particles have limited control over drug release profiles, including burst release, the inability to provide zero-order, pulsatile, time-delayed release and controlled release of multiple drugs. In an attempt to better control drug release kinetics, the development of multilayered microparticles has been introduced. In this review, we give an overview of the fabrication and characterization techniques of multilayered polymeric microparticles. We also focus on the one-step solvent evaporation technique, and the key process parameters in this technique that affect the formation of microparticle configurations. In addition, the benefits and challenges of multilayered microparticulate system for drug delivery were discussed. This review intends to portray how distinctive structural attributes and degradation behaviors of multilayered microparticles can be exploited to fine-tune drug release profiles and kinetics.
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Affiliation(s)
- Wei Li Lee
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Ave., Singapore, Singapore
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19
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Ulery BD, Nair LS, Laurencin CT. Biomedical Applications of Biodegradable Polymers. JOURNAL OF POLYMER SCIENCE. PART B, POLYMER PHYSICS 2011; 49:832-864. [PMID: 21769165 PMCID: PMC3136871 DOI: 10.1002/polb.22259] [Citation(s) in RCA: 1169] [Impact Index Per Article: 89.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Utilization of polymers as biomaterials has greatly impacted the advancement of modern medicine. Specifically, polymeric biomaterials that are biodegradable provide the significant advantage of being able to be broken down and removed after they have served their function. Applications are wide ranging with degradable polymers being used clinically as surgical sutures and implants. In order to fit functional demand, materials with desired physical, chemical, biological, biomechanical and degradation properties must be selected. Fortunately, a wide range of natural and synthetic degradable polymers has been investigated for biomedical applications with novel materials constantly being developed to meet new challenges. This review summarizes the most recent advances in the field over the past 4 years, specifically highlighting new and interesting discoveries in tissue engineering and drug delivery applications.
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Affiliation(s)
- Bret D. Ulery
- Department of Orthopaedic Surgery, New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, Connecticut 06030
- Institute of Regenerative Engineering, University of Connecticut Health Center, Farmington, Connecticut 06030
| | - Lakshmi S. Nair
- Department of Orthopaedic Surgery, New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, Connecticut 06030
- Institute of Regenerative Engineering, University of Connecticut Health Center, Farmington, Connecticut 06030
- Department of Chemical, Materials & Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06268
| | - Cato T. Laurencin
- Department of Orthopaedic Surgery, New England Musculoskeletal Institute, University of Connecticut Health Center, Farmington, Connecticut 06030
- Institute of Regenerative Engineering, University of Connecticut Health Center, Farmington, Connecticut 06030
- Department of Chemical, Materials & Biomolecular Engineering, University of Connecticut, Storrs, Connecticut 06268
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20
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Dånmark S, Finne-Wistrand A, Schander K, Hakkarainen M, Arvidson K, Mustafa K, Albertsson AC. In vitro and in vivo degradation profile of aliphatic polyesters subjected to electron beam sterilization. Acta Biomater 2011; 7:2035-46. [PMID: 21316490 DOI: 10.1016/j.actbio.2011.02.011] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2010] [Revised: 01/13/2011] [Accepted: 02/07/2011] [Indexed: 11/29/2022]
Abstract
Degradation characteristics in response to electron beam sterilization of designed and biodegradable aliphatic polyester scaffolds are relevant for clinically successful synthetic graft tissue regeneration. Scaffold degradation in vitro and in vivo were documented and correlated to the macroscopic structure and chemical design of the original polymer. The materials tested were of inherently diverse hydrophobicity and crystallinity: poly(L-lactide) (poly(LLA)) and random copolymers from L-lactide and ε-caprolactone or 1,5-dioxepan-2-one, fabricated into porous and non-porous scaffolds. After sterilization, the samples underwent hydrolysis in vitro for up to a year. In vivo, scaffolds were surgically implanted into rat calvarial defects and retrieved for analysis after 28 and 91days. In vitro, poly(L-lactide-co-1,5-dioxepan-2-one) (poly(LLA-co-DXO)) samples degraded most rapidly during hydrolysis, due to the pronounced chain-shortening reaction caused by the sterilization. This was indicated by the rapid decrease in both mass and molecular weight of poly(LLA-co-DXO). Poly(L-lactide-co-ε-caprolactone) (poly(LLA-co-CL)) samples were also strongly affected by sterilization, but mass loss was more gradual; molecular weight decreased rapidly during hydrolysis. Least affected by sterilization were the poly(LLA) samples, which subsequently showed low mass loss rate and molecular weight decrease during hydrolysis. Mechanical stability varied greatly: poly(LLA-co-CL) withstood mechanical testing for up to 182 days, while poly(LLA) and poly(LLA-co-DXO) samples quickly became too brittle. Poly(LLA-co-DXO) samples unexpectedly degraded more rapidly in vitro than in vivo. After sterilization by electron beam irradiation, the three biodegradable polymers present widely diverse degradation profiles, both in vitro and in vivo. Each exhibits the potential to be tailored to meet diverse clinical tissue engineering requirements.
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Affiliation(s)
- S Dånmark
- Centre for Clinical Dental Research, Department of Clinical Dentistry, Faculty of Medicine and Dentistry, University of Bergen, Norway
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21
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XIONG S, Zhao X, Heng BC, Ng KW, Loo JSC. Cellular uptake of Poly-(D,L-lactide-co-glycolide) (PLGA) nanoparticles synthesized through solvent emulsion evaporation and nanoprecipitation method. Biotechnol J 2011; 6:501-8. [DOI: 10.1002/biot.201000351] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2010] [Revised: 11/27/2010] [Accepted: 11/30/2010] [Indexed: 12/17/2022]
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22
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23
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Kang SW, Lee SJ, Kim JS, Choi EH, Cha BH, Shim JH, Cho DW, Lee SH. Effect of a Scaffold Fabricated Thermally from Acetylated PLGA on the Formation of Engineered Cartilage. Macromol Biosci 2010; 11:267-74. [DOI: 10.1002/mabi.201000315] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 09/06/2010] [Indexed: 11/07/2022]
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24
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Miao P, Wu D, Zeng K, Zhao C, Xu G, Huang Z, Yang G. Degradation of poly(D,L-lactic acid)-b-poly(ethylene glycol) copolymer and poly(L-lactic acid) by electron beam irradiation. J Appl Polym Sci 2010. [DOI: 10.1002/app.33174] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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25
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Loo SCJ, Tan ZYS, Chow YJ, Lin SLI. Drug Release From Irradiated PLGA and PLLA Multi-Layered Films. J Pharm Sci 2010; 99:3060-71. [DOI: 10.1002/jps.22079] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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26
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Phong L, Han ESC, Xiong S, Pan J, Loo SCJ. Properties and hydrolysis of PLGA and PLLA cross-linked with electron beam radiation. Polym Degrad Stab 2010. [DOI: 10.1016/j.polymdegradstab.2010.02.012] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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27
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Mandoli C, Mecheri B, Forte G, Pagliari F, Pagliari S, Carotenuto F, Fiaccavento R, Rinaldi A, Di Nardo P, Licoccia S, Traversa E. Thick Soft Tissue Reconstruction on Highly Perfusive Biodegradable Scaffolds. Macromol Biosci 2010; 10:127-38. [DOI: 10.1002/mabi.200900323] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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28
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Tan HY, Widjaja E, Boey F, Loo SCJ. Spectroscopy techniques for analyzing the hydrolysis of PLGA and PLLA. J Biomed Mater Res B Appl Biomater 2009; 91:433-40. [DOI: 10.1002/jbm.b.31419] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Miao P, Zhao C, Xu G, Fu Q, Tang W, Zeng K, Wang Y, Zhou H, Yang G. Degradation of poly(D,L-lactic acid)-b-poly(ethylene glycol)-b-poly(D,L-lactic acid) copolymer by electron beam radiation. J Appl Polym Sci 2009. [DOI: 10.1002/app.29866] [Citation(s) in RCA: 15] [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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30
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Joachim Loo SC, Jason Tan WL, Khoa SM, Chia NK, Venkatraman S, Boey F. Hydrolytic degradation characteristics of irradiated multi-layered PLGA films. Int J Pharm 2008; 360:228-30. [DOI: 10.1016/j.ijpharm.2008.04.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2008] [Revised: 03/25/2008] [Accepted: 04/11/2008] [Indexed: 11/27/2022]
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31
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Chia NK, Venkatraman SS, Boey FYC, Cadart S, Loo JSC. Controlled degradation of multilayered poly(lactide-co-glycolide) films using electron beam irradiation. J Biomed Mater Res A 2008; 84:980-7. [PMID: 17647238 DOI: 10.1002/jbm.a.31404] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The ability to undergo predictable and controlled degradation allows biopolymers to release prescribed dosages of drugs locally over a sustained period. However, the bulk or homogeneous degradation of some of these polymers like poly(L-lactide) (PLLA) and poly(lactide-co-glycolide) (PLGA) work against a better controlled release of the drugs. Inducing the polymers to undergo surface erosion or layer-by-layer degradation could provide a better process of controlled drug release from the polymers. This study has demonstrated that surface erosion degradation of PLGA is possible with the use of a multilayer film system, with PPdlLGA [plasticized poly(D,L-lactide-co-glycolide) (PdlLGA)] as the surface layers and poly(L-lactide-co-glycolide) as the center layer. The use of the more hydrophilic PPdlLGA as the surface layer resulted in a faster degradation of the surface layers compared to the center layer, thus giving a surface erosion degradation effect. The rate of surface degradation could also be controlled with electron beam (e-beam) radiation, where e-beam irradiation was shown to alter the degradation time and onset of polymer mass loss. It was also shown that the more highly irradiated PPdlLGA surface layers had an earlier onset of mass loss, which resulted in a faster reduction in overall film thickness. The ability to control the rate of film thickness reduction with different radiation dose promises a better controlled release of drugs from this multilayer PLGA film system.
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Affiliation(s)
- N K Chia
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore
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