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Xiao S, Wei J, Liu J, Yuan L, Xia X, Zou Q, Zuo Y, Li Y, Li J. In situ comparison of osteogenic effects of polymer-based scaffolds with different degradability by integrated scaffold model. Colloids Surf B Biointerfaces 2024; 241:114047. [PMID: 38897025 DOI: 10.1016/j.colsurfb.2024.114047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Revised: 06/11/2024] [Accepted: 06/16/2024] [Indexed: 06/21/2024]
Abstract
Polymer-based scaffolds with different degradability have been investigated to screen the matrix whose degradation rate is more closely matched with the bone regeneration rate. However, these comparisons are inclined to be compromised by the animal individual differences. In this study, we constructed an integrated scaffold model comprising four parts with different degradability and bioactivity to achieve an in situ comparison of bone regeneration ability of different scaffolds. Slow-degradable polycaprolactone (PCL), fast-degradable poly (lactic-co-glycolic acid) (PLGA), and silica-coated PCL and PLGA scaffolds were assembled into a round sheet to form a hydroxyapatite (HA)-free integrated scaffold. HA-doped PCL, PLGA, and silica-coated PCL and PLGA scaffolds were assembled to create an HA-incorporated integrated scaffold. The in vivo experimental results demonstrated that the local acid microenvironment caused by the rapid degradation of PLGA interfered with the osteogenic process promoted by PCL-based scaffolds in defect areas implanted with HA-free integrated scaffolds. Since the incorporation of HA alleviated the acidic microenvironment to some extent, each scaffold in HA-incorporated scaffolds exhibited its expected bone regeneration capacity. Consequently, it is feasible to construct an integrated structure for comparing the osteogenic effects of various scaffolds in situ, when there is no mutual interference between the materials. The strategy presented in this study inspired the structure design of biomaterials to enable in situ comparison of bone regeneration capacity of scaffolds.
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Affiliation(s)
- Shiqi Xiao
- The Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610065, China; Clinical Medical College & Affiliated Hospital of Chengdu University, Chengdu University, Chengdu 610081, China
| | - Jiawei Wei
- The Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610065, China
| | - Jiangshan Liu
- The Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610065, China
| | - Li Yuan
- The Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610065, China
| | - Xue Xia
- The Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610065, China
| | - Qin Zou
- The Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610065, China
| | - Yi Zuo
- The Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610065, China
| | - Yubao Li
- The Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610065, China.
| | - Jidong Li
- The Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610065, China.
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2
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Kundak H, Bilisik K. Development of Three-Dimensional (3D) Biodegradable Polyglycolic Acid Fiber (PGA) Preforms for Scaffold Applications: Experimental Patterning and Fiber Volume Fraction-Porosity Modeling Study. Polymers (Basel) 2023; 15:polym15092083. [PMID: 37177227 PMCID: PMC10181393 DOI: 10.3390/polym15092083] [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: 02/25/2023] [Revised: 04/22/2023] [Accepted: 04/25/2023] [Indexed: 05/15/2023] Open
Abstract
Three-dimensional (3D) biodegradable polyglycolic acid fiber (PGA) preforms were developed as temporary scaffolds for three-dimensional tissue regeneration applications. Three-dimensional biodegradable polyglycolic acid fiber (PGA) preforms including various degrees of interlaced structures called 3D plain, semi-interlaced, and orthogonal woven preforms were designed. Analytical relations and finite element model-based software (TexGen) on fiber volume fraction and porosity fraction were proposed to predict scaffolds' stiffness and strength properties considering micromechanics relations. It was revealed that yarn-to-yarn space, density, and angles of all 3D PGA fiber preforms were heterogeneous and demonstrated direction-dependent features (anisotropy). Total fiber volume fractions (Vfp) and porosity fraction (Vtpr) predicted by analytic and numerical modelling of all 3D scaffolds showed some deviations compared to the measured values. This was because yarn cross-sections in the scaffolds were changed from ideal circular yarn (fiber TOW) geometry to high-order ellipse (lenticular) due to inter-fiber pressure generated under a tensile-based macrostress environment during preform formation. Z-yarn modulus (Ez-yarn) and strength (σz-yarn) were probably critical values due to strong stiffness and strength in the through-the-thickness direction where hydrogel modulus and strengths were negligibly small. Morphology of the scaffold showed that PGA fiber sets in the preform were locally distorted, and they appeared as inconsistent and inhomogeneous continuous fiber forms. Additionally, various porosity shapes in the preform based on the virtual model featured complex shapes from nearly trapezoidal beams to partial or concave rectangular beams and ellipsoid rectangular cylinders. It was concluded that 3D polyglycolic acid fiber preforms could be a temporary supportive substrate for 3D tissue regeneration because cells in the scaffold's thickness can grow via through-the-thickness fiber (z-yarn), including various possible mechanobiology mechanisms.
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Affiliation(s)
- Hikmet Kundak
- Nano/Micro Fiber Preform Design and Composite Laboratory, Department of Textile Engineering, Faculty of Engineering, Erciyes University, Talas 38039, Kayseri, Turkey
| | - Kadir Bilisik
- Nano/Micro Fiber Preform Design and Composite Laboratory, Department of Textile Engineering, Faculty of Engineering, Erciyes University, Talas 38039, Kayseri, Turkey
- Nanotechnology Application and Research Centre (ERNAM), Erciyes University, Talas 38039, Kayseri, Turkey
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Tsai LL, Fitzgerald DM, Liu R, Korunes-Miller JT, Neal E, Hung YP, Bilton S, Hata A, Grinstaff MW, Colson YL. Porous Paclitaxel Mesh Reduces Local Recurrence in Patient-Derived Xenograft Resection Model. Ann Thorac Surg 2022:S0003-4975(22)01325-X. [PMID: 36376135 PMCID: PMC10172394 DOI: 10.1016/j.athoracsur.2022.09.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 09/15/2022] [Accepted: 09/19/2022] [Indexed: 11/13/2022]
Abstract
BACKGROUND Drug-loaded meshes offer a promising delivery strategy for the prevention of local recurrence. Patient-derived xenograft (PDX) models are representative of individual patient tumors and predictive of clinical outcomes. METHODS A PDX model was established in NSG (NOD-scid IL2Rgammanull) mice using tumor tissue from a patient with aggressive lung adenocarcinoma. Polyglycolic acid (PGA) meshes loaded with paclitaxel (PGA+PTX) were electrospun. Tumor-bearing mice were randomized into 4 groups after macroscopic complete resection: (1) no treatment (n = 10); (2) intraperitoneal PTX at 20 mg/kg (n = 10); (3) PGA mesh without drug (n = 14); and (4) PGA+PTX mesh at 12 mg/kg (n = 14). A 1-cm2 mesh was placed onto the tumor resection beds. Groups were observed for local recurrence for 120 postoperative days. RESULTS PDX mice treated with PGA+PTX meshes after resection exhibited a >5-fold increase in recurrence-free survival (P < .0001) compared with systemically treated and untreated control groups. Median recurrence-free survival was 24 days for untreated and intraperitoneal PTX groups, 28 days for unloaded PGA mesh group, and undefined for the PGA+PTX mesh group. CONCLUSIONS Development of a PDX surgical resection model of non-small cell lung cancer permits robust assessment of postresection local recurrence for preclinical studies of patient-derived tumors. Intraoperative placement of drug-loaded meshes demonstrates superior local disease treatment, suggesting that this approach may improve recurrence-free survival in early-stage non-small cell lung cancer patients undergoing limited resection.
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Affiliation(s)
- Lillian L Tsai
- Division of Thoracic Surgery, Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts
| | - Danielle M Fitzgerald
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts; Department of Chemistry, Boston University, Boston, Massachusetts
| | - Rong Liu
- Division of Thoracic Surgery, Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts
| | - Jenny T Korunes-Miller
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts; Department of Chemistry, Boston University, Boston, Massachusetts
| | - Eliza Neal
- Division of Thoracic Surgery, Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts
| | - Yin P Hung
- Department of Pathology, Massachusetts General Hospital, Boston, Massachusetts
| | - Samantha Bilton
- Department of Medicine, Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | - Aaron Hata
- Department of Medicine, Massachusetts General Hospital Cancer Center, Boston, Massachusetts
| | - Mark W Grinstaff
- Department of Biomedical Engineering, Boston University, Boston, Massachusetts; Department of Chemistry, Boston University, Boston, Massachusetts
| | - Yolonda L Colson
- Division of Thoracic Surgery, Department of Surgery, Massachusetts General Hospital, Boston, Massachusetts.
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4
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Biodegradation of poly(L-lactic acid) and poly(ε-caprolactone) patches by human amniotic fluid in an in-vitro simulated fetal environment. Sci Rep 2022; 12:3950. [PMID: 35273223 PMCID: PMC8913814 DOI: 10.1038/s41598-022-07681-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Accepted: 01/04/2022] [Indexed: 11/17/2022] Open
Abstract
Open spina bifida or myelomeningocele (MMC) is a devastating neurologic congenital defect characterized by primary failure of neural tube closure of the spinal column during the embryologic period. Cerebrospinal fluid leak caused by the MMC spinal defect in the developing fetus can result in a constellation of encephalic anomalies that include hindbrain herniation and hydrocephalus. The exposure of extruded spinal cord to amniotic fluid also poses a significant risk for inducing partial or complete paralysis of the body parts beneath the spinal aperture by progressive spinal cord damage in-utero. A randomized trial demonstrated that prenatal repair by fetal surgery, sometimes using patches, to cover the exposed spinal cord with a watertight barrier is effective in reducing the postnatal neurologic morbidity as evidenced by decreased incidence and severity of postnatal hydrocephalus and the reduced need for ventricular-peritoneal shunting. Currently, the use of inert or collagen-based patches are associated with high costs and inadequate structural properties. Specifically, the inert patches do not degrade after implantation, causing the need for a post-natal removal surgery associated with trauma for the newborn. Our present study is aimed towards in-vitro degradation studies of a newly designed patch, which potentially can serve as a superior alternative to existing patches for MMC repair. This novel patch was fabricated by blending poly(l-lactic acid) and poly(ε-caprolactone). The 16-week degradation study in amniotic fluid was focused on tracking changes in crystallinity and mechanical properties. An additional set of designed patches was exposed to phosphate-buffered saline (PBS), as a time-paired control. Crystallinity studies indicate the progress of hydrolytic degradation of the patch in both media, with a preference to bulk erosion in phosphate buffered saline and surface erosion in amniotic fluid. Mechanical testing results establish that patch integrity is not compromised up to 16 weeks of exposure either to body fluids analog (PBS) or to amniotic fluid.
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Huang J, Wei J, Jin S, Zou Q, Li J, Zuo Y, Li Y. The ultralong-term comparison of osteogenic behavior of three scaffolds with different matrices and degradability between one and two years. J Mater Chem B 2021; 8:9524-9532. [PMID: 32996978 DOI: 10.1039/d0tb01987a] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Attributed to their structure and composition manipulated to mimic natural bone tissue, porous scaffolds composed of inorganic nano-hydroxyapatite (n-HA) and organic polymers with different degrees of degradability have been proven to be a promising bone regeneration strategy. However, long-term and in-depth comparative research on the effects of scaffolds with different matrices and degrees of degradability on bone reconstruction is still lacking. In this study, the ultralong-term osteogenic performance of three polymeric composite scaffolds based on non-degradable polyamide 66 (PA66), slowly degradable polycaprolactone (PCL) and fast degradable poly (lactic-co-glycolic acid) (PLGA) were investigated comparatively after implanting the scaffolds into rabbit femoral defects for 12, 15, 18 and 21 months. The results demonstrated that the structural integrity of the scaffolds played a positive role in long-term bone reconstruction. Thus the n-HA/PA66 and n-HA/PCL scaffolds have a higher relative bone volume and bone density than the n-HA/PLGA scaffolds from 12 to 21 months. In addition, the favorable surface wettability and collagen-like molecular structure should endow the n-HA/PA66 scaffold with the best long-term osteogenic property among the three scaffolds. The ultralong-term comparative study reveals that a relatively stable scaffold integrity, together with favorable matrix molecular characteristics and hydrophilicity, may be more important for long-term osteogenesis besides the effect of scaffold pore structure, rather than the pursuit of fast scaffold degradation. The results also show that the space left by scaffold degradation is not easily occupied by new bone tissue, especially after bone tissue has formed a stable structure or the bone interface has become inert.
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Affiliation(s)
- Jinhui Huang
- Research Center for Nano-Biomaterials, Analytical & Testing Center, Sichuan University, Chengdu 610064, China.
| | - Jiawei Wei
- Research Center for Nano-Biomaterials, Analytical & Testing Center, Sichuan University, Chengdu 610064, China.
| | - Shue Jin
- Research Center for Nano-Biomaterials, Analytical & Testing Center, Sichuan University, Chengdu 610064, China.
| | - Qin Zou
- Research Center for Nano-Biomaterials, Analytical & Testing Center, Sichuan University, Chengdu 610064, China.
| | - Jidong Li
- Research Center for Nano-Biomaterials, Analytical & Testing Center, Sichuan University, Chengdu 610064, China.
| | - Yi Zuo
- Research Center for Nano-Biomaterials, Analytical & Testing Center, Sichuan University, Chengdu 610064, China.
| | - Yubao Li
- Research Center for Nano-Biomaterials, Analytical & Testing Center, Sichuan University, Chengdu 610064, China.
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6
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Ramirez JC, Flores-Villaseñor SE, Vargas-Reyes E, Herrera-Ordonez J, Torres-Rincón S, Peralta-Rodríguez RD. Preparation of PDLLA and PLGA nanoparticles stabilized with PVA and a PVA-SDS mixture: Studies on particle size, degradation and drug release. J Drug Deliv Sci Technol 2020. [DOI: 10.1016/j.jddst.2020.101907] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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7
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Hadavi E, de Vries RHW, Smink AM, de Haan B, Leijten J, Schwab LW, Karperien MHBJ, de Vos P, Dijkstra PJ, van Apeldoorn AA. In vitro degradation profiles and in vivo biomaterial-tissue interactions of microwell array delivery devices. J Biomed Mater Res B Appl Biomater 2020; 109:117-127. [PMID: 32672384 PMCID: PMC7754331 DOI: 10.1002/jbm.b.34686] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 05/28/2020] [Accepted: 06/16/2020] [Indexed: 12/13/2022]
Abstract
To effectively apply microwell array cell delivery devices their biodegradation rate must be tailored towards their intended use and implantation location. Two microwell array devices with distinct degradation profiles, either suitable for the fabrication of retrievable systems in the case of slow degradation, or cell delivery systems capable of extensive remodeling using a fast degrading polymer, were compared in this study. Thin films of a poly(ethylene glycol)‐poly(butylene terephthalate) (PEOT‐PBT) and a poly(ester urethane) were evaluated for their in vitro degradation profiles over 34 weeks incubation in PBS at different pH values. The PEOT‐PBT films showed minimal in vitro degradation over time, while the poly(ester urethane) films showed extensive degradation and fragmentation over time. Subsequently, microwell array cell delivery devices were fabricated from these polymers and intraperitoneally implanted in Albino Oxford rats to study their biocompatibility over a 12‐week period. The PEOT‐PBT implants shown to be capable to maintain the microwell structure over time. Implants provoked a foreign body response resulting in multilayer fibrosis that integrated into the surrounding tissue. The poly(ester urethane) implants showed a loss of the microwell structures over time, as well as a fibrotic response until the onset of fragmentation, at least 4 weeks post implantation. It was concluded that the PEOT‐PBT implants could be used as retrievable cell delivery devices while the poly(ester urethane) implants could be used for cell delivery devices that require remodeling within a 4–12 week period.
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Affiliation(s)
- Elahe Hadavi
- Department of Developmental BioEngineering, Faculty of Science and Technology, Technical Medical Centre, University of Twente, Enschede, The Netherlands
| | - Rick H W de Vries
- Department of Cell Biology - Inspired Tissue Engineering (cBITE), MERLN Institute for Technology Inspired Regenerative Medicine, Maastricht University, Maastricht, The Netherlands
| | - Alexandra M Smink
- Department of Pathology and Medical Biology, Section of Immunoendocrinology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Bart de Haan
- Department of Pathology and Medical Biology, Section of Immunoendocrinology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Jeroen Leijten
- Department of Developmental BioEngineering, Faculty of Science and Technology, Technical Medical Centre, University of Twente, Enschede, The Netherlands
| | | | - Marcel H B J Karperien
- Department of Developmental BioEngineering, Faculty of Science and Technology, Technical Medical Centre, University of Twente, Enschede, The Netherlands
| | - Paul de Vos
- Department of Pathology and Medical Biology, Section of Immunoendocrinology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Pieter J Dijkstra
- Department of Developmental BioEngineering, Faculty of Science and Technology, Technical Medical Centre, University of Twente, Enschede, The Netherlands
| | - Aart A van Apeldoorn
- Department of Cell Biology - Inspired Tissue Engineering (cBITE), MERLN Institute for Technology Inspired Regenerative Medicine, Maastricht University, Maastricht, The Netherlands
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Calleros EL, Simonovsky FI, Garty S, Ratner BD. Crosslinked, biodegradable polyurethanes for precision‐porous biomaterials: Synthesis and properties. J Appl Polym Sci 2020. [DOI: 10.1002/app.48943] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
| | | | - Shai Garty
- Department of BioengineeringUniversity of Washington Seattle WA 98195 USA
| | - Buddy D. Ratner
- Department of BioengineeringUniversity of Washington Seattle WA 98195 USA
- Department of Chemical EngineeringUniversity of Washington Seattle WA 98195 USA
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Osteogenic differentiation of hMSCs on semi-interpenetrating polymer networks of polyurethane/poly(2‑hydroxyethyl methacrylate)/cellulose nanowhisker scaffolds. Int J Biol Macromol 2019; 138:262-271. [PMID: 31302125 DOI: 10.1016/j.ijbiomac.2019.07.080] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Revised: 06/19/2019] [Accepted: 07/11/2019] [Indexed: 12/18/2022]
Abstract
Poly (2‑hydroxyethyl methacrylate) (PHEMA) was crosslinked in the presence of biocompatible and biodegradable poly(caprolactone) (PCL) based polyurethanes (PUs) and cellulose nanowhiskers (CNWs). The CNWs were obtained from wastepaper. In order to crosslink PHEMA (10 wt%), a novel acrylic-urethane cross-linker was produced by a condensation reaction of PHEMA and hexamethylene diisocyanate (HDI). The PU-PHEMA-CNWs scaffolds were prepared by solvent casting/particulate leaching method in different weight percentages of CNWs (i.e., 0, 0.1, 0.5, and 1 wt%). The structural, mechanical, and in vitro biological properties of bio-nanocomposites were evaluated via FTIR, SEM, tensile, and MTT assay. The tensile strength of PU-PHEMA-0, PU-PHEMA-0.1, PU-PHEMA-0.5, and PU-PHEMA-1 were 76.2, 95.8, 98.1, and 89.8 kPa, respectively. Incorporation of CNWs also resulted in improved cell proliferation on PU-PHEMA-CNWs scaffolds. The bone marrow derived human mesenchymal stem cells (hMSCs) were seeded on the prepared porous scaffolds and incubated in osteogenic medium. Based on the results including calcium content assay, alkaline phosphatase assay, and mineralization staining, PU-PHEMA-CNW scaffolds were introduced as a suitable election for imitating the behavior of cellular niche. Bone mineralization and osteogenesis differentiation of hMSCs on PU-PHEMA-CNW scaffolds were significantly more than control after 14 days.
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10
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Reyhanoglu Y, Gokturk E. Polyglycolic acid copolymers from one‐step cationic polymerization of formaldehyde, carbon monoxide, and epoxides derived from PEG. POLYM ADVAN TECHNOL 2019. [DOI: 10.1002/pat.4611] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Yusuf Reyhanoglu
- Department of ChemistryHatay Mustafa Kemal University 31001 Hatay Turkey
| | - Ersen Gokturk
- Department of ChemistryHatay Mustafa Kemal University 31001 Hatay Turkey
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11
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Tatu R, Oria M, Pulliam S, Signey L, Rao MB, Peiro JL, Lin CY. Using poly(l-lactic acid) and poly(ɛ-caprolactone) blends to fabricate self-expanding, watertight and biodegradable surgical patches for potential fetoscopic myelomeningocele repair. J Biomed Mater Res B Appl Biomater 2018; 107:295-305. [PMID: 29770571 DOI: 10.1002/jbm.b.34121] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 02/04/2018] [Accepted: 03/14/2018] [Indexed: 01/01/2023]
Abstract
Our study focuses on the development and characterization of a self-expanding, watertight and biodegradable patch for fetoscopic myelomeningocele (MMC) prenatal repair. We fabricated poly(l-lactic acid) (PLA) and poly(ɛ-caprolactone) (PCL) blend films by solution casting. Formulation c with average glass transition temperature of 37.6 ± 1.2°C was chosen for temporospatial recovery. Favorable results from surface studies reflected homogeneous dispersion of polymers in the blend. The cytotoxicity was studied in human foreskin fibroblasts. The blend film was cytocompatible, evidenced by matching percentage of live cells in exposed and control solutions. Subsequently, liquid water permeability experiments confirmed watertight nature of films. Finally, in vitro degradation was investigated in phosphate buffered saline (PBS) and amniotic fluid (AF) separately for 16 weeks. Similar weight loss (n = 6, p = 0.912) and significantly different (n = 3, p = 0.025) surface roughness was observed in PBS and AF, respectively, at 16 weeks. Functional group analysis displayed increasing carbonyl and hydroxyl bonds in PBS and AF, respectively, over time, indicating progression of hydrolytic degradation. Favorable characterization results provide strong evidence to employ PLA-PCL blend films as surgical patches in fetoscopic MMC repair. Designed patch serves as standalone system to successfully tackle impending hurdles of MMC repair and proves to be a superior alternative compared to existing patches. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 107B: 295-305, 2019.
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Affiliation(s)
- Rigwed Tatu
- Structural Tissue Evaluation and Engineering Laboratory, Department of Biomedical Engineering, University of Cincinnati, Cincinnati, Ohio, 45221
| | - Marc Oria
- Pediatric General and Thoracic Surgery Division, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, 45229
| | - Sarah Pulliam
- Structural Tissue Evaluation and Engineering Laboratory, Department of Biomedical Engineering, University of Cincinnati, Cincinnati, Ohio, 45221
| | - Lorenzo Signey
- Structural Tissue Evaluation and Engineering Laboratory, Department of Biomedical Engineering, University of Cincinnati, Cincinnati, Ohio, 45221
| | - Marepalli B Rao
- Department of Environmental Health, Department of Biomedical Engineering, University of Cincinnati, Cincinnati, Ohio, 45267
| | - Jose L Peiro
- Pediatric General and Thoracic Surgery Division, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, 45229
| | - Chia-Ying Lin
- Structural Tissue Evaluation and Engineering Laboratory, Department of Biomedical Engineering, University of Cincinnati, Cincinnati, Ohio, 45221.,Department of Orthopedic Surgery, University of Cincinnati, Cincinnati, Ohio, 45221.,Department of Neurosurgery, University of Cincinnati, Cincinnati, Ohio, 45221
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12
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Marzec M, Kucińska-Lipka J, Kalaszczyńska I, Janik H. Development of polyurethanes for bone repair. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 80:736-747. [PMID: 28866223 DOI: 10.1016/j.msec.2017.07.047] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Revised: 01/23/2017] [Accepted: 07/29/2017] [Indexed: 12/12/2022]
Abstract
The purpose of this paper is to review recent developments on polyurethanes aimed at the design, synthesis, modifications, and biological properties in the field of bone tissue engineering. Different polyurethane systems are presented and discussed in terms of biodegradation, biocompatibility and bioactivity. A comprehensive discussion is provided of the influence of hard to soft segments ratio, catalysts, stiffness and hydrophilicity of polyurethanes. Interaction with various cells, behavior in vivo and current strategies in enhancing bioactivity of polyurethanes are described. The discussion on the incorporation of biomolecules and growth factors, surface modifications, and obtaining polyurethane-ceramics composites strategies is held. The main emphasis is placed on the progress of polyurethane applications in bone regeneration, including bone void fillers, shape memory scaffolds, and drug carrier.
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Affiliation(s)
- M Marzec
- Department of Polymer Technology, Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
| | - J Kucińska-Lipka
- Department of Polymer Technology, Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland.
| | - I Kalaszczyńska
- Department of Histology and Embryology, Center for Biostructure Research, Medical University of Warsaw, Chalubinskiego 5, 02-004 Warsaw, Poland; Centre for Preclinical Research and Technology, Banacha 1b, 02-097 Warsaw, Poland
| | - H Janik
- Department of Polymer Technology, Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
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13
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Lee S, Hongo C, Nishino T. Crystal Modulus of Poly(glycolic acid) and Its Temperature Dependence. Macromolecules 2017. [DOI: 10.1021/acs.macromol.7b00753] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sunglin Lee
- Department of Chemical Science
and Engineering, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan
| | - Chizuru Hongo
- Department of Chemical Science
and Engineering, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan
| | - Takashi Nishino
- Department of Chemical Science
and Engineering, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan
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14
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Kucinska-Lipka J, Gubanska I, Strankowski M, Cieśliński H, Filipowicz N, Janik H. Synthesis and characterization of cycloaliphatic hydrophilic polyurethanes, modified with l-ascorbic acid, as materials for soft tissue regeneration. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 75:671-681. [PMID: 28415514 DOI: 10.1016/j.msec.2017.02.052] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 11/26/2016] [Accepted: 02/14/2017] [Indexed: 12/11/2022]
Abstract
In this paper we described synthesis and characteristic of obtained hydrophilic polyurethanes (PURs) modified with ascorbic acid (commonly known as vitamin C). Such materials may find an application in the biomedical field, for example in the regenerative medicine of soft tissues, according to ascorbic acid wide influence on tissue regeneration Flora (2009), Szymańska-Pasternak et al. (2011), Taikarimi and Ibrahim (2011), Myrvik and Volk (1954), Li et al. (2001), Cursino et al. (2005) . Hydrophilic PURs were obtained with the use of amorphous α,ω-dihydroxy(ethylene-butylene adipate) (dHEBA) polyol, 1,4-butanediol (BDO) chain extender and aliphatic 4,4'-methylenebis(cyclohexyl isocyanate) (HMDI). HMDI was chosen as a nontoxic diisocyanate, suitable for biomedical PUR synthesis. Modification with l-ascorbic acid (AA) was performed to improve obtained PUR materials biocompatibility. Chemical structure of obtained PURs was provided and confirmed by Fourier transform infrared spectroscopy (FTIR) and Proton nuclear magnetic resonance spectroscopy (1HNMR). Differential scanning calorimetry (DSC) was used to indicate the influence of ascorbic acid modification on such parameters as glass transition temperature, melting temperature and melting enthalpies of obtained materials. To determine how these materials may potentially behave, after implementation in tissue, degradation behavior of obtained PURs in various chemical environments, which were represented by canola oil, saline solution, distilled water and phosphate buffered saline (PBS) was estimated. The influence of AA on hydrophilic-hydrophobic character of obtained PURs was established by contact angle study. This experiment revealed that ascorbic acid significantly improves hydrophilicity of obtained PUR materials and the same cause that they are more suitable candidates for biomedical applications. Good hemocompatibility characteristic of studied PUR materials was confirmed by the hemocompatibility test with human blood. Microbiological tests were carried out to indicate the microbiological sensitivity of obtained PURs. Results of performed studies showed that obtained AA-modified PUR materials may find an application in soft tissue regeneration.
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Affiliation(s)
- J Kucinska-Lipka
- Gdank University of Technology, Faculty of Chemistry, Department of Polymer Technology, Narutowicza St. 11/12, 80-233 Gdansk, Poland.
| | - I Gubanska
- Gdank University of Technology, Faculty of Chemistry, Department of Polymer Technology, Narutowicza St. 11/12, 80-233 Gdansk, Poland
| | - M Strankowski
- Gdank University of Technology, Faculty of Chemistry, Department of Polymer Technology, Narutowicza St. 11/12, 80-233 Gdansk, Poland
| | - H Cieśliński
- Gdansk University of Technology, Faculty of Chemistry, Department of Microbiology, Narutowicza St. 11/12, 80-233 Gdansk, Poland
| | - N Filipowicz
- Gdansk University of Technology, Faculty of Chemistry, Department of Microbiology, Narutowicza St. 11/12, 80-233 Gdansk, Poland
| | - H Janik
- Gdank University of Technology, Faculty of Chemistry, Department of Polymer Technology, Narutowicza St. 11/12, 80-233 Gdansk, Poland
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15
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Manavitehrani I, Fathi A, Badr H, Daly S, Negahi Shirazi A, Dehghani F. Biomedical Applications of Biodegradable Polyesters. Polymers (Basel) 2016; 8:E20. [PMID: 30979116 PMCID: PMC6432531 DOI: 10.3390/polym8010020] [Citation(s) in RCA: 260] [Impact Index Per Article: 32.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 01/08/2016] [Accepted: 01/11/2016] [Indexed: 01/08/2023] Open
Abstract
The focus in the field of biomedical engineering has shifted in recent years to biodegradable polymers and, in particular, polyesters. Dozens of polyester-based medical devices are commercially available, and every year more are introduced to the market. The mechanical performance and wide range of biodegradation properties of this class of polymers allow for high degrees of selectivity for targeted clinical applications. Recent research endeavors to expand the application of polymers have been driven by a need to target the general hydrophobic nature of polyesters and their limited cell motif sites. This review provides a comprehensive investigation into advanced strategies to modify polyesters and their clinical potential for future biomedical applications.
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Affiliation(s)
- Iman Manavitehrani
- School of Chemical and Biomolecular Engineering, University of Sydney, NSW 2006, Australia.
| | - Ali Fathi
- School of Chemical and Biomolecular Engineering, University of Sydney, NSW 2006, Australia.
| | - Hesham Badr
- School of Chemical and Biomolecular Engineering, University of Sydney, NSW 2006, Australia.
| | - Sean Daly
- School of Chemical and Biomolecular Engineering, University of Sydney, NSW 2006, Australia.
| | - Ali Negahi Shirazi
- School of Chemical and Biomolecular Engineering, University of Sydney, NSW 2006, Australia.
| | - Fariba Dehghani
- School of Chemical and Biomolecular Engineering, University of Sydney, NSW 2006, Australia.
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16
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Synthesis and characterization of biodegradable polyurethane films based on HDI with hydrolyzable crosslinked bonds and a homogeneous structure for biomedical applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 52:22-30. [DOI: 10.1016/j.msec.2015.03.027] [Citation(s) in RCA: 110] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Revised: 01/31/2015] [Accepted: 03/22/2015] [Indexed: 01/11/2023]
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17
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Time of flight secondary ion mass spectrometry surface and in-depth study of degradation of nanosheet poly(l-lactic acid) films. Biointerphases 2015; 10:019010. [DOI: 10.1116/1.4908206] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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18
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In situ preparation of poly(l-lactic acid-co-glycolic acid)/hydroxyapatite composites as artificial bone materials. Polym J 2014. [DOI: 10.1038/pj.2014.121] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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19
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Wang DK, Zhang X, Diniz da Costa JC. Claisen-type degradation mechanism of cellulose triacetate membranes in ethanol–water mixtures. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2013.12.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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20
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Aghdam RM, Shakhesi S, Najarian S, Mohammadi MM, Ahmadi Tafti SH, Mirzadeh H. Fabrication of a Nanofibrous Scaffold for the In Vitro Culture of Cardiac Progenitor Cells for Myocardial Regeneration. INT J POLYM MATER PO 2013. [DOI: 10.1080/00914037.2013.800983] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Ozbolat IT, Marchany M, Gardella JA, Koc B. Computer-Aided 4D Modeling of Hydrolytic Degradation in Micropatterned Bioresorbable Membranes. J Med Device 2013. [DOI: 10.1115/1.4024158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Real-time degradation studies of bioresorbable polymers can take weeks, months, and even years to conduct. For this reason, developing and validating mathematical models that describe and predict degradation can provide a means to accelerate the development of materials and devices for controlled drug release. This study aims to develop and experimentally validate a computer-aided model that simulates the hydrolytic degradation kinetics of bioresorbable polymeric micropatterned membranes for tissue engineering applications. Specifically, the model applies to circumstances that are conducive for the polymer to undergo surface erosion. The developed model provides a simulation tool enabling the prediction and visualization of the dynamic geometry of the degrading membrane. In order to validate the model, micropatterned polymeric membranes were hydrolytically degraded in vitro and the morphological changes were analyzed using optical microscopy. The model is then extended to predict spatiotemporal degradation kinetics of variational micropatterned architectures.
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Affiliation(s)
- Ibrahim T. Ozbolat
- Department of Mechanical and Industrial Engineering, Biomanufacturing Laboratory, Center for Computer-Aided Design, The University of Iowa, Iowa, IA 52242 e-mail:
| | | | - Joseph A. Gardella
- Department of Chemistry, University at Buffalo, 359 Natural Sciences Complex, Buffalo, NY 14260
| | - Bahattin Koc
- Faculty of Engineering and Natural Sciences, Sabanci University, FENS G013 Tuzla, Istanbul 34956, Turkey
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22
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Loh XJ. The effect of pH on the hydrolytic degradation of poly(ε-caprolactone)-block-poly(ethylene glycol) copolymers. J Appl Polym Sci 2012. [DOI: 10.1002/app.37712] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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23
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Liu Q, Jiang L, Shi R, Zhang L. Synthesis, preparation, in vitro degradation, and application of novel degradable bioelastomers—A review. Prog Polym Sci 2012. [DOI: 10.1016/j.progpolymsci.2011.11.001] [Citation(s) in RCA: 127] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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24
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SATO H, KOBAYASHI F, ICHIKAWA Y, OISHI Y. Synthesis and Characterization of Polyglycolic Acid via Sequential Melt-Solid Ring-Opening Polymerization of Glycolide. KOBUNSHI RONBUNSHU 2012. [DOI: 10.1295/koron.69.60] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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25
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Chung AS, Hwang HS, Das D, Zuk P, McAllister DR, Wu BM. Lamellar stack formation and degradative behaviors of hydrolytically degraded poly(ε-caprolactone) and poly(glycolide-ε-caprolactone) blended fibers. J Biomed Mater Res B Appl Biomater 2011; 100:274-84. [DOI: 10.1002/jbm.b.31950] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Revised: 06/05/2011] [Accepted: 07/05/2011] [Indexed: 11/12/2022]
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26
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Han X, Pan J. Polymer chain scission, oligomer production and diffusion: a two-scale model for degradation of bioresorbable polyesters. Acta Biomater 2011; 7:538-47. [PMID: 20832507 DOI: 10.1016/j.actbio.2010.09.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2010] [Revised: 08/26/2010] [Accepted: 09/02/2010] [Indexed: 11/25/2022]
Abstract
This paper presents a computer model for the biodegradation of polyesters such as poly(lactic acid), poly(glycolic acid) and their copolymers. The model can take polymer details such as molecular weight distribution, different end and random scission rates and copolymer ratio as input data. A multi-scale approach is developed: polymer chain scission and oligomer production which occur at the molecular scale are modelled using a kinetic Monte Carlo scheme, oligomer diffusion which occurs at the device scale is modelled using a diffusion equation, and the two are connected at the finite difference nodes of the diffusion equation. The two-scale model can be used to predict the temporal evolution and spatial distribution of molecular weight distribution in a device as well as the weight loss as a function of time. It is shown that the kinetic Monte Carlo scheme can accurately predict the effect of copolymer ratio on the degradation rate. Grizzi and co-workers observed in their experiments that a PLA film 0.3mm thick degrades much more slowly than one that is 2mm thick. The numerical study shows that the conceptional reaction diffusion model suggested by Grizzi et al. needs to be extended in order to explain the size effect fully.
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27
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Lee WK, Wells DD, Goacher RE, Gardella JA. The control of surface segregation of blend films using stereocomplex formation between enantiomeric polylactide chains. SURF INTERFACE ANAL 2010. [DOI: 10.1002/sia.3487] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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28
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Synthesis, structural study and hydrolytic degradation of copolymer based on glycolic acid and bis-2-hydroxyethyl terephthalate. Polym Degrad Stab 2009. [DOI: 10.1016/j.polymdegradstab.2008.10.026] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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29
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Burns SA, Gardella JA. Quantitative ToF-SIMS Studies of Protein Drug Release from Biodegradable Polymer Drug Delivery Membranes. APPLIED SURFACE SCIENCE 2008; 255:1170-1173. [PMID: 20016666 PMCID: PMC2678735 DOI: 10.1016/j.apsusc.2008.05.082] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Biodegradable polymers are of interest in developing strategies to control protein drug delivery. The protein that was used in this study is Keratinocyte Growth Factor (KGF) which is a protein involved in the re-epithelialization process. The protein is stabilized in the biodegradable polymer matrix during formulation and over the course of polymer degradation with the use of an ionic surfactant Aerosol-OT (AOT) which will encapsulate the protein in an aqueous environment. The release kinetics of the protein from the surface of these materials requires precise timing which is a crucial factor in the efficacy of this drug delivery system.Time of Flight Secondary Ion Mass Spectrometry (ToF-SIMS) was used in the same capacity to identify the molecular ion peak of the surfactant and polymer and use this to determine surface concentration. In the polymer matrix, the surfactant molecular ion peak was observed in the positive and negative mode at m/z 467 and 421, respectively. These peaks were determined to be [AOT + Na+] and [AOT-Na+]-. These methods are used to identify the surfactant and protein from the polymer matrix and are used to measure the rate of surface accumulation. The second step was to compare this accumulation rate with the release rate of the protein into an aqueous solution during the degradation of the biodegradable film. This rate is compared to that from fluorescence spectroscopy measurements using the protein autofluorescence from that released into aqueous solution.
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30
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Pierce BF, Brown AH, Sheares VV. Thermoplastic Poly(ester urethane)s with Novel Soft Segments. Macromolecules 2008. [DOI: 10.1021/ma7022205] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Benjamin F. Pierce
- Department of Chemistry, University of North Carolina at Chapel Hill, CB#3290, Caudill Hall, North Carolina 27599-3290
| | - Andrew H. Brown
- Department of Chemistry, University of North Carolina at Chapel Hill, CB#3290, Caudill Hall, North Carolina 27599-3290
| | - Valerie V. Sheares
- Department of Chemistry, University of North Carolina at Chapel Hill, CB#3290, Caudill Hall, North Carolina 27599-3290
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31
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Cho H, An J. The effect of ε-caproyl/d,l-lactyl unit composition on the hydrolytic degradation of poly(d,l-lactide-ran-ε-caprolactone)-poly(ethylene glycol)-poly(d,l-lactide-ran-ε-caprolactone). Biomaterials 2006; 27:544-52. [PMID: 16099497 DOI: 10.1016/j.biomaterials.2005.06.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2005] [Accepted: 06/22/2005] [Indexed: 11/24/2022]
Abstract
The degradation of P(DLAX-ran-CLY)-b-PEG-b-P(DLAX-ran-CLY)s ( P(DLAX-ran-CLY): Poly(D,L-lactide-ran-epsilon-caprolactone), PEG: Poly(ethylene glycol), X: D,L-lactyl unit fraction, Y: epsilon-caproyl unit fraction) is investigated. The fraction of DLA in the both end blocks is varied while the overall molecular weight and molecular weight of PEG are kept constant. DSC, XRD and GPC are employed to track the degradation process up to 200 days. Also the change in the surface and cross-sectional morphology is provided by SEM micro-photographs. The result of water absorption and weight loss characterization reveals that the incorporation of DLA in the polyester block could be an effective tool to facilitate degradation as well as water absorption. By tracking the change of molecular weight and polydispersity, chain scission and transport or removal of degraded product from the specimen were found to play a complex role in overall degradation.
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Affiliation(s)
- Hanjin Cho
- Center for Advanced Functional Polymers, Department of Polymer science & Engineering, Sungkyunkwan University, Suwon 440-746, Korea
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32
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Kuo YC, Leou SN. Effects of Composition, Solvent, and Salt Particles on the Physicochemical Properties of Polyglycolide/Poly(lactide-co-glycolide) Scaffolds. Biotechnol Prog 2006. [DOI: 10.1002/bp0602303] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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33
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In vitro degradation behaviour of non-porous ultra-fine poly(glycolic acid)/poly(l-lactic acid) fibres and porous ultra-fine poly(glycolic acid) fibres. Polym Degrad Stab 2005. [DOI: 10.1016/j.polymdegradstab.2005.04.015] [Citation(s) in RCA: 73] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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34
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Loh XJ, Tan KK, Li X, Li J. The in vitro hydrolysis of poly(ester urethane)s consisting of poly[(R)-3-hydroxybutyrate] and poly(ethylene glycol). Biomaterials 2005; 27:1841-50. [PMID: 16305807 DOI: 10.1016/j.biomaterials.2005.10.038] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2005] [Accepted: 10/31/2005] [Indexed: 11/30/2022]
Abstract
This paper reports the study of the complete degradation process for a series of newly synthesized multi-block poly(ester urethane)s consisting of poly[(R)-3-hydroxybutyrate] (PHB) as hard and hydrophobic block and poly(ethylene glycol) (PEG) as soft and hydrophilic segment. The initial stages of degradation of the poly(PHB/PEG urethane)s were monitored by carrying out the degradation experiments at pH 7.4 and 37 degrees C. The weight loss of the copolymer films was traced, and the degraded copolymer films were characterized by GPC, (1)H NMR, TGA, and SEM. The induction phase of the polymer degradation was characterized by a random chain scission of the ester backbone bonds of the PHB segments and an insignificant decline in the weight of the polymer films. An accelerated degradation process was carried out at pH 11.5 and 37 degrees C to investigate the long-term degradation behaviour. The characterization of the degraded polymer films was similar to that for the experiment at pH 7.4. In addition, the water-soluble degradation products were characterized by GPC, (1)H NMR, and FTIR. The main components of the water-soluble degradation products were found to be PEG blocks (monomeric up to quadmeric), 3-hydroxybutyric acid, and crotonic acid. It was found that the copolymer incorporating the highest amount of PEG degraded at the highest rate of all the copolymers studied. The complete degradation of the poly(PHB/PEG urethane)s was monitored using a combination of the physiological and accelerated hydrolytic degradation.
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Affiliation(s)
- Xian Jun Loh
- Institute of Materials Research and Engineering (IMRE), National University of Singapore, 3 Research Link, Singapore 117602, Singapore
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35
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Ha CS, Gardella JA. Surface Chemistry of Biodegradable Polymers for Drug Delivery Systems. Chem Rev 2005; 105:4205-32. [PMID: 16277374 DOI: 10.1021/cr040419y] [Citation(s) in RCA: 158] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chang-Sik Ha
- Department of Polymer Science and Engineering, Pusan National University, Pusan 609-735, Korea
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36
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Merrett K, Cornelius RM, McClung WG, Unsworth LD, Sheardown H. Surface analysis methods for characterizing polymeric biomaterials. JOURNAL OF BIOMATERIALS SCIENCE. POLYMER EDITION 2003; 13:593-621. [PMID: 12182547 DOI: 10.1163/156856202320269111] [Citation(s) in RCA: 85] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Surface properties have an enormous effect on the success or failure of a biomaterial device, thus signifying the considerable importance of and the need for adequate characterization of the biomaterial surface. Microscopy techniques used in the analysis of biomaterial surfaces include scanning electron microscopy, transmission electron microscopy, atomic force microscopy, and confocal microscopy. Spectroscopic techniques include X-ray photoelectron spectroscopy, Fourier Transform infrared attenuated total reflection and secondary ion mass spectrometry. The measurement of contact angles, although one of the earlier techniques developed remains a very useful tool in the evaluation of surface hydrophobicity/hydrophilicity. This paper provides a brief, easy to understand synopsis of these and other techniques including emerging techniques, which are proving useful in the analysis of the surface properties of polymeric biomaterials. Cautionary statements have been made, numerous authors referenced and examples used to show the specific type of information that can be acquired from the different techniques used in the characterization of polymeric biomaterials surfaces.
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Affiliation(s)
- K Merrett
- Department of Chemical Engineering, University of Ottawa, ON, Canada
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37
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Lee JW, Gardella JA. Quantitative TOF-SIMS analysis of oligomeric degradation products at the surface of biodegradable poly(alpha-hydroxy acid)s. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2002; 13:1108-1119. [PMID: 12322958 DOI: 10.1016/s1044-0305(02)00425-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This paper reports the development of a new method for quantification of the hydrolytic surface degradation kinetics of biodegradable poly(alpha-hydroxy acid)s using time-of-flight secondary ion mass spectrometry (TOF-SIMS). We report results from static SIMS spectra of a series of poly(alpha-hydroxy acid)s including poly(glycolic acid), poly(L-lactic acid), and random poly(D,L-lactic acid-co-glycolic acid) hydrolyzed in various buffer systems. The distribution of the most intense peak intensities of ions generated in high mass range of the spectrum reflects the intact degradation products (oligomeric hydrolysis products) of each biodegradable polymer. First, a detailed analysis of the oligomeric ions is given based on rearrangement of the intact hydrolysis products. The pattern of ions can distinguish both degradation-generated intact oligomers and their fragment ion peaks with a variety of combinations of each repeat unit. Then, the integration and summation of the area of all ion peaks with the same number of repeat units is proposed as a measurement that provides a more accurate MW average than the typically used method which counts only the most intense peak. The multiple ion summation method described in this paper would be practical in the improvement of quantitative TOF-SIMS studies as a better data reduction method, especially in the surface degradation kinetics of biodegradable polymers.
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Affiliation(s)
- Joo-Woon Lee
- Department of Chemistry, State University of New York at Buffalo, 14260-3000, USA
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