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Huang X, Zhang S, Zhang P, Zhu Y, Xie J, Yang M, Han L, Hu J, Li Q, He J. Autonomous indication of electrical degradation in polymers. NATURE MATERIALS 2024; 23:237-243. [PMID: 37974006 DOI: 10.1038/s41563-023-01725-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Accepted: 10/12/2023] [Indexed: 11/19/2023]
Abstract
Dielectric polymers are ubiquitous as electrical insulation in electronic devices and electrical systems. Electrical degradation of dielectric polymers tends to initiate catastrophic failure of numerous devices and systems, but its detection and early warning remain challenging. Here we report a general material strategy that signals the electrical degradation of dielectric polymers by autonomously presenting a visually discernible warning in the form of a pronounced colour change. This colour change is induced by the chromogenic response of molecular indicators blended with the polymer, which are chemically activated by the oxygen radicals generated in situ during the electrical degradation of the polymer. We unveil that the structural degradation and electrical properties of the dielectric polymer are quantitatively correlated with the colour difference. Such a chromogenic process is autonomous without the need of human intervention or other external energy, thus offering the convenience to lower or even eliminate the risk of dielectric failure.
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Affiliation(s)
- Xiaoyan Huang
- State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, China
| | - Shuai Zhang
- State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, China
| | - Pei Zhang
- State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, China
| | - Yujie Zhu
- State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, China
| | - Jiaye Xie
- State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, China
| | - Mingcong Yang
- State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, China
| | - Lu Han
- State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, China
| | - Jun Hu
- State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, China
| | - Qi Li
- State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, China.
| | - Jinliang He
- State Key Laboratory of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, China.
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Lehner E, Honeder C, Knolle W, Binder W, Scheffler J, Plontke SK, Liebau A, Mäder K. Towards the optimization of drug delivery to the cochlear apex: Influence of polymer and drug selection in biodegradable intracochlear implants. Int J Pharm 2023; 643:123268. [PMID: 37488058 DOI: 10.1016/j.ijpharm.2023.123268] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 07/20/2023] [Accepted: 07/21/2023] [Indexed: 07/26/2023]
Abstract
There is growing need for new drug delivery systems for intracochlear application of drugs to effectively treat inner ear disorders. In this study, we describe the development and characterization of biodegradable, triamcinolone-loaded implants based on poly(lactic-co-glycolic acid) (PLGA) and polyethylene glycol-poly(lactic-co-glycolic acid) (PEG-PLGA) respectively, prepared by hot-melt extrusion. PEG 1500 was used as a plasticizer to improve flexibility and accelerate drug release. The sterilization process was performed by electron beam irradiation, resulting in minimal but acceptable polymer degradation for PEG-PLGA implants. The implants have been characterized by texture analysis, differential scanning calorimetry and X-ray powder diffraction. Compared to PLGA implants, PEG-PLGA implants offer similar flexibility but with improved mechanical stability, which will ease the handling and intracochlear application. A controlled release over three months was observed for dexamethasone and triamcinolone extrudates (drug load of 10%) with similar release profiles for both drugs. PEG-PLGA implants showed an initial slow release rate over several days regardless of the amount of PEG added. Mathematical simulations of the pharmacokinetics of the inner ear based on the in vitro release kinetics indicate a complete distribution of triamcinolone in the whole human scala tympani, which underlines the high potential of the developed formulation.
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Affiliation(s)
- E Lehner
- Department of Otorhinolaryngology-Head and Neck Surgery, Martin Luther University of Halle-Wittenberg, Halle (Saale), Germany.
| | - C Honeder
- Department of Otorhinolaryngology-Head and Neck Surgery, Martin Luther University of Halle-Wittenberg, Halle (Saale), Germany
| | - W Knolle
- Leibniz Institute of Surface Engineering (IOM), Leipzig, Germany
| | - W Binder
- Institute of Chemistry, Martin-Luther University of Halle-Wittenberg, Halle (Saale), Germany
| | - J Scheffler
- Department of Otorhinolaryngology-Head and Neck Surgery, Martin Luther University of Halle-Wittenberg, Halle (Saale), Germany
| | - S K Plontke
- Department of Otorhinolaryngology-Head and Neck Surgery, Martin Luther University of Halle-Wittenberg, Halle (Saale), Germany; Halle Research Centre for Drug Therapy (HRCDT), Halle (Saale), Germany
| | - A Liebau
- Department of Otorhinolaryngology-Head and Neck Surgery, Martin Luther University of Halle-Wittenberg, Halle (Saale), Germany
| | - K Mäder
- Institute of Pharmacy, Martin Luther University of Halle-Wittenberg, Halle (Saale), Germany; Halle Research Centre for Drug Therapy (HRCDT), Halle (Saale), Germany
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3
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Nsairat H, Lafi Z, Al-Sulaibi M, Gharaibeh L, Alshaer W. Impact of nanotechnology on the oral delivery of phyto-bioactive compounds. Food Chem 2023; 424:136438. [PMID: 37244187 DOI: 10.1016/j.foodchem.2023.136438] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 05/17/2023] [Accepted: 05/18/2023] [Indexed: 05/29/2023]
Abstract
Nanotechnology is an advanced field that has remarkable nutraceutical and food applications. Phyto-bioactive compounds (PBCs) play critical roles in promoting health and disease treatment. However, PBCs generally encounter several limitations that delay their widespread application. For example, most PBCs have low aqueous solubility, poor biostability, poor bioavailability, and a lack of target specificity. Moreover, the high concentrations of effective PBC doses also limit their application. As a result, encapsulating PBCs into an appropriate nanocarrier may increase their solubility and biostability and protect them from premature degradation. Moreover, nanoencapsulation could improve absorption and prolong circulation with a high opportunity for targeted delivery that may decrease unwanted toxicity. This review addresses the main parameters, variables, and barriers that control and affect oral PBC delivery. Moreover, this review discusses the potential role of biocompatible and biodegradable nanocarriers in improving the water solubility, chemical stability, bioavailability, and specificity/selectivity of PBCs.
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Affiliation(s)
- Hamdi Nsairat
- Pharmacological and Diagnostic Research Center, Faculty of Pharmacy, Al-Ahliyya Amman University, Amman 19328, Jordan.
| | - Zainab Lafi
- Pharmacological and Diagnostic Research Center, Faculty of Pharmacy, Al-Ahliyya Amman University, Amman 19328, Jordan
| | - Mazen Al-Sulaibi
- Pharmacological and Diagnostic Research Center, Faculty of Pharmacy, Al-Ahliyya Amman University, Amman 19328, Jordan
| | - Lobna Gharaibeh
- Pharmacological and Diagnostic Research Center, Faculty of Pharmacy, Al-Ahliyya Amman University, Amman 19328, Jordan
| | - Walhan Alshaer
- Cell Therapy Center, The University of Jordan, Amman 11942, Jordan.
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4
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Saraf I, Kushwah V, Alva C, Koutsamanis I, Rattenberger J, Schroettner H, Mayrhofer C, Modhave D, Braun M, Werner B, Zangger K, Paudel A. Influence of PLGA End Groups on the Release Profile of Dexamethasone from Ocular Implants. Mol Pharm 2023; 20:1307-1322. [PMID: 36680524 DOI: 10.1021/acs.molpharmaceut.2c00945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The present study deals with the development of dexamethasone (DM)-loaded implants using ester end-capped Resomer RG 502 poly(lactic acid-co-glycolic acid) (PLGA) (502), acid end-capped Resomer RG 502H PLGA (502H), and a 502H:502 mixture (3:1) via hot melt extrusion (HME). The prepared intravitreal implants (20 and 40% DM loaded in each PLGA) were thoroughly investigated to determine the effect of different end-capped PLGA and drug loading on the long-term release profile of DM. The implants were characterized for solid-state active pharmaceutical ingredient (APIs) using DSC and SWAXS, water uptake during stability study, the crystal size of API in the implant matrix using hot-stage polarized light microscopy, and in vitro release profile. The kinetics of PLGA release was thoroughly investigated using quantitative 1H NMR spectroscopy. The polymorph of DM crystal was found to remain unchanged after the extrusion and stability study. However, around 3 times reduction in API particle size was observed after the HME process. The morphology and content uniformity of the RT-stored samples were found to be comparable to the initial implant samples. Interestingly, the samples (mainly 502H) stored at 40 °C and 75% RH for 30 d demonstrated marked deformation and a change in content uniformity. The rate of DM release was higher in the case of 502H samples with a higher drug loading (40% w/w). Furthermore, a simple digital in vitro DM release profile derived for the formulation containing a 3:1 ratio of 502H and 502 was comparable with the experimental release profile of the respective polymer mixture formulation. The temporal development of pores and/or voids in the course of drug dissolution, evaluated using μCT, was found to be a precursor for the PLGA release. Overall, the release profile of DM was found to be dependent on the PLGA type (independent of subtle changes in the formulation mass and diameter). However, the extent of release was found to be dependent on DM loading. Thus, the present investigation led to a thorough understanding of the physicochemical properties of different end-capped PLGAs and the underlying formulation microstructure on the release profile of a crystalline water-insoluble drug, DM, from the PLGA-based implant.
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Affiliation(s)
- Isha Saraf
- Research Centre for Pharmaceutical Engineering, Inffeldgasse 13/2, Graz8010, Austria
| | - Varun Kushwah
- Research Centre for Pharmaceutical Engineering, Inffeldgasse 13/2, Graz8010, Austria
| | - Carolina Alva
- Research Centre for Pharmaceutical Engineering, Inffeldgasse 13/2, Graz8010, Austria
| | - Ioannis Koutsamanis
- Research Centre for Pharmaceutical Engineering, Inffeldgasse 13/2, Graz8010, Austria
| | | | - Hartmuth Schroettner
- Graz Centre for Electron Microscopy (ZFE), Steyrergasse 17, Graz8010, Austria.,Institute of Electron Microscopy and Nanoanalysis (FELMI), NAWI Graz, Graz University of Technology, Steyrergasse 17, Graz8010, Austria
| | - Claudia Mayrhofer
- Graz Centre for Electron Microscopy (ZFE), Steyrergasse 17, Graz8010, Austria
| | - Dattatray Modhave
- Research Centre for Pharmaceutical Engineering, Inffeldgasse 13/2, Graz8010, Austria
| | - Michael Braun
- Pharmaceutical Development, Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach88397, Germany
| | - Bernd Werner
- Institute of Chemistry, University of Graz, Heinrichstr. 28, Graz8010, Austria
| | - Klaus Zangger
- Institute of Chemistry, University of Graz, Heinrichstr. 28, Graz8010, Austria
| | - Amrit Paudel
- Research Centre for Pharmaceutical Engineering, Inffeldgasse 13/2, Graz8010, Austria.,Institute for Process and Particle Engineering, Graz University of Technology, Inffeldgasse 13/3, Graz8010, Austria
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Yang L, Tao Y, Gordon MP, Menon AK, Chen Y, Prasher RS, Urban JJ. Morphological Ordering of the Organic Layer for High-Performance Hybrid Thermoelectrics. ACS APPLIED MATERIALS & INTERFACES 2022; 14:57460-57470. [PMID: 36524813 DOI: 10.1021/acsami.2c19156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Inorganic-organic hybrids, such as Te-PEDOT:PSS core/shell nanowires, have emerged as a class of promising thermoelectric materials with combined attributes of mechanical flexibility and low cost. However, the poorly understood structure-property relationship calls for further investigation for performance enhancement. Here, through precise treatments of focused electron beam irradiation and thermal annealing on individual Te-PEDOT:PSS nanowires, new, nonchemical mechanisms are introduced to specifically engineer the organic phase, and the measured results provide an unprecedented piece of evidence, confirming the dominant role of organic shell in charge transport. Paired with the Kang-Snyder model and molecular dynamics simulations, this work provides mechanistic insights in terms of heating-enabled morphological ordering of the polymer chains. The measured results show that thermal annealing on the 42 nm nanowire results in a ZT value of 0.78 at 450 K. Through leveraging the interfacial self-assembly of the organic phase to construct a high electrical conductivity domain, this work lays out a clear framework for the development of next-generation soft thermoelectrics.
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Affiliation(s)
- Lin Yang
- Department of Advanced Manufacturing and Robotics, College of Engineering, Peking University, Beijing100871, P. R. China
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
| | - Yi Tao
- School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing210096, P. R. China
| | - Madeleine P Gordon
- Applied Science and Technology Graduate Group, University of California, Berkeley, California94720, United States
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
| | - Akanksha K Menon
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
- George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia30332, United States
| | - Yunfei Chen
- School of Mechanical Engineering and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing210096, P. R. China
| | - Ravi S Prasher
- Energy Storage and Distributed Resources Division, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
- Department of Mechanical Engineering, University of California, Berkeley, California94720, United States
| | - Jeffrey J Urban
- The Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California94720, United States
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Wang B, Liu M, Liu J, Tian Y, Liu W, Wu G, Cheng J, Zhang Y, Zhao G, Ni Z. Key Factors of Mechanical Strength and Toughness in Oriented Poly(l-lactic acid) Monofilaments for a Bioresorbable Self-Expanding Stent. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:13477-13487. [PMID: 36306177 DOI: 10.1021/acs.langmuir.2c01972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The investigation of the strength and toughness of poly(l-lactic acid) (PLLA) monofilaments is essential as the fundamental element of a biodegradable braided stent. However, the determining factor remains poorly addressed with respect to influencing the mechanical behavior of PLLA monofilaments. In this work, the electron beam (EB) with different radiation doses was utilized to sterilize PLLA monofilaments. Properties of the monofilaments, including the breaking strength, elongation at break, molecular weight, orientation, and microstructure of the fracture, were characterized. Results showed that a random chain scission of PLLA resulting from EB during this process could cause the decrease in molecular weight, which led to the decline in breaking strength. Meanwhile, the irradiated monofilaments were found to have almost the same elongation at break below a dose of 30 kGy and declined by 71.41% up to a dose of 48 kGy. It was also found that the ductile fracture connection of the monofilament translated to the brittle fracture by comparing the microstructure without and with sterilization. These phenomena could originate from the destruction of the long molecular chains connecting the crystal plates into shorter ones by radiation. PLLA monofilaments with 0, 30, and 48 kGy were used to braid carotid stents. Compared with a carotid Wallstent, the PLLA stent can better provide radial supporting to the carotid lesion. This study provides preliminary experimental references to evaluate and predict the mechanical performance of PLLA braided stents.
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Affiliation(s)
- Bin Wang
- School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing211189, China
| | - Muqing Liu
- School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing211189, China
| | - Jinbo Liu
- School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing211189, China
| | - Yuan Tian
- School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing211189, China
| | - Wentao Liu
- School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing211189, China
| | - Gensheng Wu
- School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing210037, China
| | - Jie Cheng
- School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing211189, China
| | - Yi Zhang
- Center of Interventional Radiology & Vascular Surgery, Department of Radiology, Zhongda Hospital, Medical School, Southeast University, Nanjing210044, China
| | - Gutian Zhao
- School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing211189, China
| | - Zhonghua Ni
- School of Mechanical Engineering, Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing211189, China
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Synthesis and Assessment of AMPS-Based Copolymers Prepared via Electron-Beam Irradiation for Ionic Conductive Hydrogels. Polymers (Basel) 2022; 14:polym14132547. [PMID: 35808593 PMCID: PMC9268908 DOI: 10.3390/polym14132547] [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: 05/03/2022] [Revised: 05/27/2022] [Accepted: 06/20/2022] [Indexed: 01/11/2023] Open
Abstract
In this study, ionic conductive hydrogels were prepared with 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS). Acrylic acid (AA), acrylamide (AAm), and 2-hydroxyethyl acrylate (HEA) were used as comonomers to complement the adhesion properties and ion conductivity of AMPS hydrogels. Hydrogels were prepared by irradiating a 20 kGy dose of E-beam to the aqueous monomer solution. With the E-beam irradiation, the polymer chain growth and network formation simultaneously proceeded to form a three-dimensional network. The preferred reaction was determined by the type of comonomer, and the structure of the hydrogel was changed accordingly. When AA or AAm was used as a comonomer, polymer growth and crosslinking proceeded together, so a hydrogel with increased peel strength and tensile strength could be prepared. In particular, in the case of AA, it was possible to prepare a hydrogel with improved adhesion without sacrificing ionic conductivity. When the molar ratio of AA to AMPS was 3.18, the 90° peel strength of AMPS hydrogel increased from 171 to 428 gf/25 mm, and ionic conductivity slightly decreased, from 0.93 to 0.84 S/m. By copolymerisation with HEA, polymer growth was preferred compared with chain crosslinking, and a hydrogel with lower peel strength, swelling ratio, and ionic conductivity than the pristine AMPS hydrogel was obtained.
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Li W, Chen JY, Terry RN, Tang J, Romanyuk A, Schwendeman SP, Prausnitz MR. Core-shell microneedle patch for six-month controlled-release contraceptive delivery. J Control Release 2022; 347:489-499. [PMID: 35550913 DOI: 10.1016/j.jconrel.2022.04.051] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 03/18/2022] [Accepted: 04/03/2022] [Indexed: 10/18/2022]
Abstract
There is a tremendous need for simple-to-administer, long-acting contraception, which can increase access to improved family planning. Microneedle (MN) patches enable simple self-administration and have previously been formulated for 1-2 months' controlled release of contraceptive hormone using monolithic polymer/drug MN designs having first-order release kinetics. To achieve zero-order release, we developed a novel core-shell MN patch where the shell acts as a rate-controlling membrane to delay release of a contraceptive hormone, levonorgestrel (LNG), for 6 months. In this approach, LNG was encapsulated in a poly(lactide-co-glycolide) (PLGA) core surrounded by a poly(l-lactide) (PLLA) shell and a poly(D,l-lactide) (PLA) cap that were fabricated by sequential casting into a MN mold. Upon application to skin, the core-shell MNs utilized an effervescent interface to separate from the patch backing within 1 min. The core-shell design limited the initial 24 h burst release of LNG to 5.8 ± 0.5% and achieved roughly zero-order LNG release for 6.2 ± 0.1 months in vitro. A monolithic MN patch formulated with the same LNG and PLGA core, but without the rate-controlling PLLA shell and PLA cap had a larger LNG burst release of 22.6 ± 2.0% and achieved LNG release for just 2.1 ± 0.2 months. This study provides the first core-shell MN patch for controlled months-long drug release and supports the development of long-acting contraception using a simple-to-administer, twice-per-year MN patch.
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Affiliation(s)
- Wei Li
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA; Department of Thyroid and Breast Surgery, Zhongnan Hospital of Wuhan University, School of Pharmaceutical Sciences, Wuhan University, Wuhan, Hubei 430071, China.
| | - Jonathan Yuxuan Chen
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Richard N Terry
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Jie Tang
- Department of Pharmaceutical Sciences and the Biointerfaces Institute, University of Michigan, Ann Arbor, MI 48109, USA
| | - Andrey Romanyuk
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA
| | - Steven P Schwendeman
- Department of Pharmaceutical Sciences and the Biointerfaces Institute, University of Michigan, Ann Arbor, MI 48109, USA
| | - Mark R Prausnitz
- School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
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On the Mechanism of Electron Beam Radiation-Induced Modification of Poly(lactic acid) for Applications in Biodegradable Food Packaging. APPLIED SCIENCES-BASEL 2022. [DOI: 10.3390/app12041819] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Poly(lactic acid) (PLA) is a biodegradable polymer used for food packaging. The effects of electron beam radiation on the chemical and physical properties of amorphous PLA were studied. In this study, amorphous, racemic PLA was irradiated at doses of 5, 10, 15, and 20 kGy in the absence of oxygen. Utilizing electron paramagnetic resonance spectrometry, it was found that alkoxyl radicals are initially formed as a result of C-O-C bond scissions on the backbone of the PLA. The dominant radiation mechanism was determined to be H-abstraction by alkoxyl radicals to form C-centered radicals. The C-centered radicals undergo a subsequent peroxidation reaction with oxygen. The gel permeation chromatography (GPC) results indicate reduction in polymer molecular mass. The differential scanning calorimetry and X-ray diffraction results showed a subtle increase in crystallinity of the irradiated PLA. Water vapor transmission rates were unaffected by irradiation. In conclusion, these results support that irradiated PLA is a suitable material for applications in irradiation of food packaging, including food sterilization and biodegradation.
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10
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Jacobs GP. Irradiation of pharmaceuticals: A literature review. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2021.109795] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Turek A, Rech J, Borecka A, Wilińska J, Kobielarz M, Janeczek H, Kasperczyk J. The Role of the Mechanical, Structural, and Thermal Properties of Poly(l-lactide- co-glycolide- co-trimethylene carbonate) in the Development of Rods with Aripiprazole. Polymers (Basel) 2021; 13:polym13203556. [PMID: 34685315 PMCID: PMC8539605 DOI: 10.3390/polym13203556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2021] [Revised: 09/29/2021] [Accepted: 10/01/2021] [Indexed: 11/16/2022] Open
Abstract
In this work, we aimed to determine the role of the mechanical, structural, and thermal properties of poly(l-lactide-co-glycolide-co-trimethylene carbonate) (P(l-LA:GA:TMC)) with shape memory in the formulation of implantable and biodegradable rods with aripiprazole (ARP). Hot melt extrusion (HME) and electron beam (EB) irradiation were applied in the formulation process of blank rods and rods with ARP. Rod degradation was carried out in a PBS solution. HPLC; NMR; DSC; compression and tensile tests; molecular weight (Mn); water uptake (WU); and weight loss (WL) analyses; and SEM were used in this study. HME and EB irradiation did not influence the structure of ARP. The mechanical tests indicated that the rods may be safely implanted using a pre-filled syringe. During degradation, no unfavorable changes in terpolymer content were observed. A decrease in the glass transition temperature and the Mn, and an increase in the WU and the WL were revealed. The loading of ARP and EB irradiation induced earlier pore formation and more intense WU and WL changes. ARP was released in a tri-phasic model with the lag phase; therefore, the proposed formulation may be administered as a delayed-release system. EB irradiation was found to accelerate ARP release.
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Affiliation(s)
- Artur Turek
- Chair and Department of Biopharmacy, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, Katowice, Jedności 8, 41-200 Sosnowiec, Poland; (J.W.); (J.K.)
- Correspondence: or ; Tel.: +48-32-364-12-17; Fax: +48-32-364-12-66
| | - Jakub Rech
- Department of Biotechnology and Genetic Engineering, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, Katowice, Jedności 8, 41-200 Sosnowiec, Poland;
| | - Aleksandra Borecka
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Skłodowskiej 34, 41-819 Zabrze, Poland; (A.B.); (H.J.)
| | - Justyna Wilińska
- Chair and Department of Biopharmacy, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, Katowice, Jedności 8, 41-200 Sosnowiec, Poland; (J.W.); (J.K.)
| | - Magdalena Kobielarz
- Department of Mechanics, Materials and Biomedical Engineering, Faculty of Mechanical Engineering, Wrocław University of Science and Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wroclaw, Poland;
| | - Henryk Janeczek
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Skłodowskiej 34, 41-819 Zabrze, Poland; (A.B.); (H.J.)
| | - Janusz Kasperczyk
- Chair and Department of Biopharmacy, Faculty of Pharmaceutical Sciences in Sosnowiec, Medical University of Silesia, Katowice, Jedności 8, 41-200 Sosnowiec, Poland; (J.W.); (J.K.)
- Centre of Polymer and Carbon Materials, Polish Academy of Sciences, M. Curie-Skłodowskiej 34, 41-819 Zabrze, Poland; (A.B.); (H.J.)
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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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How to Sterilize Polylactic Acid Based Medical Devices? Polymers (Basel) 2021; 13:polym13132115. [PMID: 34203204 PMCID: PMC8271615 DOI: 10.3390/polym13132115] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/18/2021] [Accepted: 06/23/2021] [Indexed: 12/24/2022] Open
Abstract
How sterilization techniques accurately affect the properties of biopolymers continues to be an issue of discussion in the field of biomedical engineering, particularly now with the development of 3D-printed devices. One of the most widely used biopolymers in the manufacture of biomedical devices is the polylactic acid (PLA). Despite the large number of studies found in the literature on PLA devices, relatively few papers focus on the effects of sterilization treatments on its properties. It is well documented in the literature that conventional sterilization techniques, such as heat, gamma irradiation and ethylene oxide, can induced damages, alterations or toxic products release, due to the thermal and hydrolytical sensitivity of PLA. The purposes of this paper are, therefore, to review the published data on the most common techniques used to sterilize PLA medical devices and to analyse how they are affecting their physicochemical and biocompatible properties. Emerging and alternative sterilization methods for sensitive biomaterials are also presented.
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Jin S, Xia X, Huang J, Yuan C, Zuo Y, Li Y, Li J. Recent advances in PLGA-based biomaterials for bone tissue regeneration. Acta Biomater 2021; 127:56-79. [PMID: 33831569 DOI: 10.1016/j.actbio.2021.03.067] [Citation(s) in RCA: 93] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 03/29/2021] [Accepted: 03/31/2021] [Indexed: 12/14/2022]
Abstract
Bone regeneration is an interdisciplinary complex lesson, including but not limited to materials science, biomechanics, immunology, and biology. Having witnessed impressive progress in the past decades in the development of bone substitutes; however, it must be said that the most suitable biomaterial for bone regeneration remains an area of intense debate. Since its discovery, poly (lactic-co-glycolic acid) (PLGA) has been widely used in bone tissue engineering due to its good biocompatibility and adjustable biodegradability. This review systematically covers the past and the most recent advances in developing PLGA-based bone regeneration materials. Taking the different application forms of PLGA-based materials as the starting point, we describe each form's specific application and its corresponding advantages and disadvantages with many examples. We focus on the progress of electrospun nanofibrous scaffolds, three-dimensional (3D) printed scaffolds, microspheres/nanoparticles, hydrogels, multiphasic scaffolds, and stents prepared by other traditional and emerging methods. Finally, we briefly discuss the current limitations and future directions of PLGA-based bone repair materials. STATEMENT OF SIGNIFICANCE: As a key synthetic biopolymer in bone tissue engineering application, the progress of PLGA-based bone substitute is impressive. In this review, we summarized the past and the most recent advances in the development of PLGA-based bone regeneration materials. According to the typical application forms and corresponding crafts of PLGA-based substitutes, we described the development of electrospinning nanofibrous scaffolds, 3D printed scaffolds, microspheres/nanoparticles, hydrogels, multiphasic scaffolds and scaffolds fabricated by other manufacturing process. Finally, we briefly discussed the current limitations and proposed the newly strategy for the design and fabrication of PLGA-based bone materials or devices.
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Rzepna M, Sadło J, Przybytniak G, Iuliano A. Impact of electron beam treatment on copolymers of polylactide and poly(trimethylene carbonate) in an air atmosphere. J Appl Polym Sci 2021. [DOI: 10.1002/app.50184] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Magdalena Rzepna
- Centre for Radiation Research and Technology Institute of Nuclear Chemistry and Technology Warsaw Poland
| | - Jarosław Sadło
- Centre for Radiation Research and Technology Institute of Nuclear Chemistry and Technology Warsaw Poland
| | - Grażyna Przybytniak
- Centre for Radiation Research and Technology Institute of Nuclear Chemistry and Technology Warsaw Poland
| | - Anna Iuliano
- Faculty of Chemistry Warsaw University of Technology Warsaw Poland
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Zhi K, Raji B, Nookala AR, Khan MM, Nguyen XH, Sakshi S, Pourmotabbed T, Yallapu MM, Kochat H, Tadrous E, Pernell S, Kumar S. PLGA Nanoparticle-Based Formulations to Cross the Blood-Brain Barrier for Drug Delivery: From R&D to cGMP. Pharmaceutics 2021; 13:pharmaceutics13040500. [PMID: 33917577 PMCID: PMC8067506 DOI: 10.3390/pharmaceutics13040500] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 04/03/2021] [Accepted: 04/05/2021] [Indexed: 12/24/2022] Open
Abstract
The blood–brain barrier (BBB) is a natural obstacle for drug delivery into the human brain, hindering treatment of central nervous system (CNS) disorders such as acute ischemic stroke, brain tumors, and human immunodeficiency virus (HIV)-1-associated neurocognitive disorders. Poly(lactic-co-glycolic acid) (PLGA) is a biocompatible polymer that is used in Food and Drug Administration (FDA)-approved pharmaceutical products and medical devices. PLGA nanoparticles (NPs) have been reported to improve drug penetration across the BBB both in vitro and in vivo. Poly(ethylene glycol) (PEG), poly(vinyl alcohol) (PVA), and poloxamer (Pluronic) are widely used as excipients to further improve the stability and effectiveness of PLGA formulations. Peptides and other linkers can be attached on the surface of PLGA to provide targeting delivery. With the newly published guidance from the FDA and the progress of current Good Manufacturing Practice (cGMP) technologies, manufacturing PLGA NP-based drug products can be achieved with higher efficiency, larger quantity, and better quality. The translation from bench to bed is feasible with proper research, concurrent development, quality control, and regulatory assurance.
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Affiliation(s)
- Kaining Zhi
- Plough Center for Sterile Drug Delivery Solutions, University of Tennessee Health Science Center, 208 South Dudley Street, Memphis, TN 38163, USA; (B.R.); (H.K.)
- Correspondence: (K.Z.); (S.K.)
| | - Babatunde Raji
- Plough Center for Sterile Drug Delivery Solutions, University of Tennessee Health Science Center, 208 South Dudley Street, Memphis, TN 38163, USA; (B.R.); (H.K.)
| | | | - Mohammad Moshahid Khan
- Department of Neurology, College of Medicine, University of Tennessee Health Science Center, 855 Monroe Avenue, Memphis, TN 38163, USA;
| | - Xuyen H. Nguyen
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, 881 Madison Ave, Memphis, TN 38163, USA; (X.H.N.); (S.S.); (E.T.); (S.P.)
| | - Swarna Sakshi
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, 881 Madison Ave, Memphis, TN 38163, USA; (X.H.N.); (S.S.); (E.T.); (S.P.)
| | - Tayebeh Pourmotabbed
- Department of Microbiology, Immunology and Biochemistry, College of Medicine, University of Tennessee Health Science Center, 858 Madison Avenue, Memphis, TN 38163, USA;
| | - Murali M. Yallapu
- Department of Immunology and Microbiology, University of Texas Rio Grande Valley, McAllen, TX 78504, USA;
| | - Harry Kochat
- Plough Center for Sterile Drug Delivery Solutions, University of Tennessee Health Science Center, 208 South Dudley Street, Memphis, TN 38163, USA; (B.R.); (H.K.)
| | - Erene Tadrous
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, 881 Madison Ave, Memphis, TN 38163, USA; (X.H.N.); (S.S.); (E.T.); (S.P.)
| | - Shelby Pernell
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, 881 Madison Ave, Memphis, TN 38163, USA; (X.H.N.); (S.S.); (E.T.); (S.P.)
| | - Santosh Kumar
- Department of Pharmaceutical Sciences, University of Tennessee Health Science Center, 881 Madison Ave, Memphis, TN 38163, USA; (X.H.N.); (S.S.); (E.T.); (S.P.)
- Correspondence: (K.Z.); (S.K.)
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Understanding of how the properties of medical grade lactide based copolymer scaffolds influence adipose tissue regeneration: Sterilization and a systematic in vitro assessment. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2021; 124:112020. [PMID: 33947531 DOI: 10.1016/j.msec.2021.112020] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Revised: 02/24/2021] [Accepted: 02/27/2021] [Indexed: 01/22/2023]
Abstract
Aliphatic polyesters are the synthetic polymers most commonly used in the development of resorbable medical implants/devices. Various three-dimensional (3D) scaffolds have been fabricated from these polymers and used in adipose tissue engineering. However, their systematic evaluation altogether lacks, which makes it difficult to select a suitable degradable polymer to design 3D resorbable implants and/or devices able to effectively mimic the properties of adipose tissue. Additionally, the impact of sterilization methods on the medical devices, if any, must be taken into account. We evaluate and compare five different medical-grade resorbable polyesters with l-lactide content ranging from 50 to 100 mol% and exhibiting different physiochemical properties depending on the comonomer (d-lactide, ε-caprolactone, glycolide, and trimethylene carbonate). The salt-leaching technique was used to prepare 3D microporous scaffolds. A comprehensive assessment of physical, chemical, and mechanical properties of the scaffolds was carried out in PBS at 37 °C. The cell-material interactions and the ability of the scaffolds to promote adipogenesis of human adipose tissue-derived stem cells were assessed in vitro. The diverse physical and mechanical properties of the scaffolds, due to the different composition of the copolymers, influenced human adipose tissue-derived stem cells proliferation and differentiation. Scaffolds made from polymers which were above their glass transition temperature and with low degree of crystallinity showed better proliferation and adipogenic differentiation of stem cells. The effect of sterilization techniques (electron beam and ethylene oxide) on the polymer properties was also evaluated. Results showed that scaffolds sterilized with the ethylene oxide method better retained their physical and chemical properties. Overall, the presented research provides (i) a detailed understanding to select a degradable polymer that has relevant properties to augment adipose tissue regeneration and can be further used to fabricate medical devices/implants; (ii) directions to prefer a sterilization method that does not change polymer properties.
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Yuan C, Jin S, Wei J, Huang J, Liu C, Lei X, Zuo Y, Li J, Li Y. The shrinking behavior, mechanism and anti-shrinkage resolution of an electrospun PLGA membrane. J Mater Chem B 2021; 9:5861-5868. [PMID: 34259271 DOI: 10.1039/d1tb00734c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The deformation shrinkage of a poly(lactide-co-glycolide) (PLGA) fibrous material seriously affects its biomedical application. To demonstrate the underlying shrinking mechanism and to find a method to prevent the shrinkage of an electrospun PLGA membrane, we investigated the shrinking behavior of PLGA electrospun membranes under various test conditions and discussed the underlying shrinking mechanism. The results indicated that the shrinkage of the electrospun PLGA membrane was mainly regulated by the glass transition of its polymer fiber; the temperature and liquid environment were found to be the two main factors leading to the shrinkage of the electrospun PLGA membrane through affecting its glass transition. Then a heat stretching (HS) technique was proposed by us to stabilize the electrospun PLGA membrane. After HS treatment, the glass transition temperature (Tg) of the electrospun PLGA membrane could increase from 48.38 °C to 54.55 °C. Our results indicated that the HS-treated membranes could maintain a high area percentage of 90.89 ± 2.27% and 84.78 ± 3.36% after immersion respectively in PBS and blood at 37 °C for 2 hours. Further experiments confirmed that the HS technique could also stabilize the dimensional structure of the electrospun PDLLA membrane in PBS and blood at 37 °C. This study provides an effective strategy for preventing the shrinkage of electrospun polyester biomaterials in a physiological environment that may benefit both the material structural stability and the in vivo biological performance.
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Affiliation(s)
- Chen Yuan
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610064, China.
| | - Shue Jin
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610064, China.
| | - Jiawei Wei
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610064, China.
| | - Jinhui Huang
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610064, China.
| | - Chang Liu
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610064, China.
| | - Xiaoyu Lei
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610064, China.
| | - Yi Zuo
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610064, China.
| | - Jidong Li
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610064, China.
| | - Yubao Li
- Research Center for Nano-Biomaterials, Analytical and Testing Center, Sichuan University, Chengdu 610064, China.
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Park K, Otte A, Sharifi F, Garner J, Skidmore S, Park H, Jhon YK, Qin B, Wang Y. Potential Roles of the Glass Transition Temperature of PLGA Microparticles in Drug Release Kinetics. Mol Pharm 2020; 18:18-32. [PMID: 33331774 DOI: 10.1021/acs.molpharmaceut.0c01089] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Poly(lactic-co-glycolic acid) (PLGA) has been used for long-acting injectable drug delivery systems for more than 30 years. The factors affecting the properties of PLGA formulations are still not clearly understood. The drug release kinetics of PLGA microparticles are influenced by many parameters associated with the formulation composition, manufacturing process, and post-treatments. Since the drug release kinetics have not been explainable using the measurable properties, formulating PLGA microparticles with desired drug release kinetics has been extremely difficult. Of the various properties, the glass transition temperature, Tg, of PLGA formulations is able to explain various aspects of drug release kinetics. This allows examination of parameters that affect the Tg of PLGA formulations, and thus, affecting the drug release kinetics. The impacts of the terminal sterilization on the Tg and drug release kinetics were also examined. The analysis of drug release kinetics in relation to the Tg of PLGA formulations provides a basis for further understanding of the factors controlling drug release.
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Affiliation(s)
- Kinam Park
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United States.,College of Pharmacy, Purdue University, West Lafayette, Indiana 47907, United States.,Akina, Inc., West Lafayette, Indiana 47906, United States
| | - Andrew Otte
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - Farrokh Sharifi
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana 47907, United States
| | - John Garner
- Akina, Inc., West Lafayette, Indiana 47906, United States
| | - Sarah Skidmore
- Akina, Inc., West Lafayette, Indiana 47906, United States
| | - Haesun Park
- Akina, Inc., West Lafayette, Indiana 47906, United States
| | - Young Kuk Jhon
- Office of Pharmaceutical Quality, Food and Drug Administration, Center for Drug Evaluation and Research, Silver Spring, Maryland 20993, United States
| | - Bin Qin
- Office of Generic Drugs, Food and Drug Administration, Center for Drug Evaluation and Research, Silver Spring, Maryland 20993, United States
| | - Yan Wang
- Office of Generic Drugs, Food and Drug Administration, Center for Drug Evaluation and Research, Silver Spring, Maryland 20993, United States
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Lehner E, Liebau A, Syrowatka F, Knolle W, Plontke SK, Mäder K. Novel biodegradable Round Window Disks for inner ear delivery of dexamethasone. Int J Pharm 2020; 594:120180. [PMID: 33338566 DOI: 10.1016/j.ijpharm.2020.120180] [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: 10/30/2020] [Revised: 12/10/2020] [Accepted: 12/11/2020] [Indexed: 12/20/2022]
Abstract
Drug delivery to the inner ear is an important and very challenging field. The cochlea is protected by several barriers that need to be overcome in the drug delivery process. Local drug delivery can avoid undesirable side effects arising from systemic drug delivery. We developed a biodegradable dexamethasone-loaded Round Window (RW) Disk based on poly(D,L-lactic-co-glycolic acid) (PLGA) for local drug therapy to the inner ear by RW membrane administration by a film-casting method. The optimal drying time was characterized by thermogravimetric analysis and differential scanning calorimetry. In addition, the mass and polymer degradation over time of drug release was measured in vitro showing a total mass loss of 70% after 3 weeks. Dexamethasone release was determined by a RW model setup using a polyethylene terephthalate membrane. We achieved a controlled release over 52 days. Ex vivo implantation of a RW Disk onto a guinea pig RW membrane indicated well-fitting properties of the drug delivery device leading to a close surface contact with the membrane and the successful proof of concept. The developed RW Disks could be new and promising drug delivery device to achieve effective local drug delivery to the inner ear for an extended time.
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Affiliation(s)
- E Lehner
- Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - A Liebau
- Department of Otorhinolaryngology-Head and Neck Surgery, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - F Syrowatka
- Interdisciplinary Center of Materials Science, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany
| | - W Knolle
- Leibniz Institute of Surface Engineering (IOM), Leipzig, Germany
| | - S K Plontke
- Department of Otorhinolaryngology-Head and Neck Surgery, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany
| | - K Mäder
- Institute of Pharmacy, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany.
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21
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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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Farokhi M, Mottaghitalab F, Reis RL, Ramakrishna S, Kundu SC. Functionalized silk fibroin nanofibers as drug carriers: Advantages and challenges. J Control Release 2020; 321:324-347. [DOI: 10.1016/j.jconrel.2020.02.022] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 02/11/2020] [Accepted: 02/11/2020] [Indexed: 12/13/2022]
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Milicevic D, Suljovrujic E. The resistance of poly-(l-lactide) to gamma radiation: effect of initial preparation and crystallinity. Polym Bull (Berl) 2020. [DOI: 10.1007/s00289-019-02880-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Nam HC, Park WH. Aliphatic Polyester-Based Biodegradable Microbeads for Sustainable Cosmetics. ACS Biomater Sci Eng 2020; 6:2440-2449. [PMID: 33455355 DOI: 10.1021/acsbiomaterials.0c00017] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Marine pollution stemming from plastic microbeads (MBs) in personal care products has been substantially increased because of their nonbiodegradability and high adsorption capacity against persistent organic pollutants (POPs) in seawater. Moreover, the manufacturing process of MBs has been based on wet processes, such as emulsification, microfluidics, and precipitation. Therefore, a green process for obtaining biodegradable MBs is urgently necessary. Aliphatic polyesters, such as poly(lactic acid) (PLA, radiation-degradable) and poly(ε-caprolactone) (PCL, radiation-cross-linkable), have biodegradability and melt processability. The eco-friendly melt electrospraying process is a simple and cost-effective method for the preparation of MBs without the need for organic reagents. In this study, the PLA and PCL MBs were obtained by adjusting the main processing parameters during the melt electrospraying process. The weight losses of PLA and PCL MBs in aqueous environments occurred faster than those of positive controls, and the thermal transition parameters were decreased with the hydrolytic degradation of MBs. In the POP adsorption test, the biodegradable MBs showed poor adsorption because of their low specific surface area. The results of the cleansing efficiency test indicated that biodegradable MBs have great potential as more sustainable cosmetics to replace nondegradable MBs.
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Affiliation(s)
- Hyeong Chan Nam
- Department of Organic Materials Engineering, College of Engineering, Chungnam National University, Daejeon 34134, South Korea
| | - Won Ho Park
- Department of Organic Materials Engineering, College of Engineering, Chungnam National University, Daejeon 34134, South Korea
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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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Studies on the Uncrosslinked Fraction of PLA/PBAT Blends Modified by Electron Radiation. MATERIALS 2020; 13:ma13051068. [PMID: 32121084 PMCID: PMC7084477 DOI: 10.3390/ma13051068] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Revised: 02/15/2020] [Accepted: 02/25/2020] [Indexed: 11/16/2022]
Abstract
The results of studies on the uncrosslinked fraction of blends of polylactide and poly(butylene adipate-co-terephthalate) (PLA/PBAT) are presented. The blends were crosslinked by using the electron radiation and triallyl isocyanurate (TAIC) at a concentration of 3 wt %. Two kinds of samples to be investigated were prepared: one contained 80 wt % PLA and the other contained 80 wt % PBAT. Both blends were irradiated with the doses of 10, 40, or 90 kGy. The uncrosslinked fraction was separated from the crosslinked one. When dried, they were subjected to quantitative analysis, Fourier transform infrared spectroscopy (FTIR) measurements, an analysis of variations in the average molecular weight, and the determination of thermal properties. It was found that the electron radiation caused various effects in the studied samples, which depended on the magnitude of the radiation dose and the weight fractions of the components of the particular blends. This was evidenced by the occurrence of the uncrosslinked fractions of different amounts, a different molecular weight distribution, and the different thermal properties of the samples. It was also concluded that the observed effects were caused by the fact that the processes of crosslinking and degradation took place mostly in PLA, while PBAT appeared to be less susceptible to the influence of the electron radiation.
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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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Composite poly(DL-lactide-co-glycolide)/poly(acrylic acid) hydrogels synthesized using UV and gamma irradiation: comparison of material properties. Radiat Phys Chem Oxf Engl 1993 2020. [DOI: 10.1016/j.radphyschem.2019.108466] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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29
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Shi M, Xuan L, Zhang Y, Wang D, Ye F, Shi X, Li Y. Synergistic effects of thermal treatment and encapsulation of calcium phosphate nanoparticles on enhancing dimensional stability and osteogenic induction potential of free-standing PLGA electrospun membranes. Colloids Surf B Biointerfaces 2019; 183:110437. [PMID: 31445359 DOI: 10.1016/j.colsurfb.2019.110437] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 07/27/2019] [Accepted: 08/10/2019] [Indexed: 12/27/2022]
Abstract
Limited dimensional stability and osteogenic induction property of poly (lactide-co-glycolide) (PLGA) electrospun membranes hampered their applications in bone tissue engineering. Thermal treatment of fixed PLGA membranes at 50 °C for 2 h and further immersion in 75% ethanol at free-standing state were adopted in order to obtain a high stability and well-maintained fiber morphology. After the process, free-standing membranes were stable during incubation in PBS at 37 °C, the volumetric ratio was 59.0%, fibers became curved, and the average diameter was 816 nm. For as-electrospun PLGA membranes, the volumetric ratio was only 35.3%, showing that thermal treatment was effective to improve the dimensional stability. The addition of calcium phosphate nanoparticles in P5-T-F further increased the volumetric ratio (64.0%) and significantly improved the mechanical properties. The mineralization capacity of PLGA membranes was enhanced because of thermal treatment. Hemolysis ratios of all samples were ∼2% indicating good hemocompatibility of PLGA electrospun membranes. Proliferation of adipose derived stem cells from rats (rADSCs) on treated PLGA membranes was significantly faster than that on untreated one, especially for sample P-T-F. In addition to thermal treatment, the addition of calcium phosphate nanoparticles showed synergistic effects on improving mineralization property and osteogenic differentiation of rADSCs. When compared with P-T-F, P5-T-F had 153.0% higher ALP activity and 518% higher calcium mineral deposition based on alizarin red assay. Thermal treatment along with encapsulation of calcium phosphate nanoparticles in PLGA electrospun membranes demonstrated a great prospect for applications in bone tissue engineering.
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Affiliation(s)
- Ming Shi
- Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou, Guangdong, PR China; Guangdong Provincial Engineering and Technology Center of Advanced and Portable Medical Devices, Sun Yat-sen University, Guangzhou, Guangdong, PR China
| | - Liuyang Xuan
- Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou, Guangdong, PR China; Guangdong Provincial Engineering and Technology Center of Advanced and Portable Medical Devices, Sun Yat-sen University, Guangzhou, Guangdong, PR China
| | - Yiling Zhang
- Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou, Guangdong, PR China; Guangdong Provincial Engineering and Technology Center of Advanced and Portable Medical Devices, Sun Yat-sen University, Guangzhou, Guangdong, PR China
| | - Dandan Wang
- Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou, Guangdong, PR China; Guangdong Provincial Engineering and Technology Center of Advanced and Portable Medical Devices, Sun Yat-sen University, Guangzhou, Guangdong, PR China
| | - Feng Ye
- Department of Pharmacology, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Disease, Beijing PR China
| | - Xuetao Shi
- School of Materials Science and Engineering, South China University of Technology, Guangzhou, Guangdong, PR China
| | - Yan Li
- Guangdong Provincial Key Laboratory of Sensor Technology and Biomedical Instrument, School of Biomedical Engineering, Sun Yat-sen University, Guangzhou, Guangdong, PR China; Guangdong Provincial Engineering and Technology Center of Advanced and Portable Medical Devices, Sun Yat-sen University, Guangzhou, Guangdong, PR China.
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Abstract
This article presents an oncologic patient with oropharyngeal cancer. After surgery with bilateral neck dissection and adjuvant radiation, the patient developed foreign body granuloma in the area of neck dissection in addition to cervical and mediastinal granuloma. Possible differential diagnoses in this situation are sarcoidosis or tumor-derived sarcoid-like lesions, but also metastases. Therefore, intensified follow-up is particularly important for oncologic patients developing granulomas.
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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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Loo K, Sin LT, Bee S, Ratnam CT, Bee S, Tee T, Rahmat AR. Electron Beam Irradiation to Recrosslink Devulcanized Sulfur Cured Rubber Blended Polypropylene. POLYM ENG SCI 2019. [DOI: 10.1002/pen.25057] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kheng‐Hooi Loo
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul Rahman 43000 Kajang, Selangor Malaysia
| | - Lee Tin Sin
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul Rahman 43000 Kajang, Selangor Malaysia
| | - Soo‐Tueen Bee
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul Rahman 43000 Kajang, Selangor Malaysia
| | - C. T. Ratnam
- Radiation Processing Technology DivisionMalaysian Nuclear Agency 43000 Kajang, Selangor Malaysia
| | - Soo‐Ling Bee
- School of Materials and Mineral Resources EngineeringEngineering Campus, Universiti Sains Malaysia Nibong Tebal, 14300 Penang Malaysia
| | - Tiam‐Ting Tee
- Department of Chemical Engineering, Lee Kong Chian Faculty of Engineering and ScienceUniversiti Tunku Abdul Rahman 43000 Kajang, Selangor Malaysia
| | - A. R. Rahmat
- Department of Polymer Engineering, Faculty of Chemical EngineeringUniversiti Teknologi Malaysia 81310 Skudai, Johor Malaysia
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Effect of segment structures on the hydrolytic degradation behaviors of totally degradable poly(L‐lactic acid)‐based copolymers. J Appl Polym Sci 2019. [DOI: 10.1002/app.47887] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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Kucko NW, Li W, García Martinez MA, Rehman IU, Ulset AST, Christensen BE, Leeuwenburgh SCG, Herber RP. Sterilization effects on the handling and degradation properties of calcium phosphate cements containing poly (D,L
-lactic-co-glycolic acid) porogens and carboxymethyl cellulose. J Biomed Mater Res B Appl Biomater 2019; 107:2216-2228. [DOI: 10.1002/jbm.b.34306] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Revised: 12/07/2018] [Accepted: 12/19/2018] [Indexed: 02/05/2023]
Affiliation(s)
- Nathan W. Kucko
- Department of Regenerative Biomaterials; Radboud University Medical Center; Philips van Leydenlaan 25, 6525 EX, Nijmegen The Netherlands
- CAM Bioceramics B.V.; Zernikedreef 6, 2333 CL, Leiden The Netherlands
| | - Wenliang Li
- Department of Regenerative Biomaterials; Radboud University Medical Center; Philips van Leydenlaan 25, 6525 EX, Nijmegen The Netherlands
| | - Marcela A. García Martinez
- Department of Materials Science and Engineering; The Kroto Research Institute, The University of Sheffield; North Campus, Broad Lane, S3 7HQ, Sheffield UK
| | - Ihtesham ur Rehman
- Department of Materials Science and Engineering; The Kroto Research Institute, The University of Sheffield; North Campus, Broad Lane, S3 7HQ, Sheffield UK
| | - Ann-Sissel Teialeret Ulset
- NOBIPOL, Department of Biotechnology and Food Science; Norwegian University of Science and Technology; Sem Saeland veg 6/8, NO-7491, Trondheim Norway
| | - Bjørn E. Christensen
- NOBIPOL, Department of Biotechnology and Food Science; Norwegian University of Science and Technology; Sem Saeland veg 6/8, NO-7491, Trondheim Norway
| | - Sander C. G. Leeuwenburgh
- Department of Regenerative Biomaterials; Radboud University Medical Center; Philips van Leydenlaan 25, 6525 EX, Nijmegen The Netherlands
| | - Ralf-Peter Herber
- CAM Bioceramics B.V.; Zernikedreef 6, 2333 CL, Leiden The Netherlands
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Chen S, Zhao X, Du C. Macroporous poly (l-lactic acid)/chitosan nanofibrous scaffolds through cloud point thermally induced phase separation for enhanced bone regeneration. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.10.003] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Dorati R, Conti B, Colzani B, Dondi D, Lazzaroni S, Modena T, Genta I. Ivermectin controlled release implants based on poly-D, l -lactide and poly-ε-caprolactone. J Drug Deliv Sci Technol 2018. [DOI: 10.1016/j.jddst.2018.04.014] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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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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38
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Guan G, Zhang J, Sun X, Li H, Yan S, Lotz B. Oriented Overgrowths of Poly(l
-Lactide) on Oriented Isotactic Polypropylene: A Sequence of Soft and Hard Epitaxies. Macromol Rapid Commun 2018; 39:e1800353. [DOI: 10.1002/marc.201800353] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Guangwu Guan
- State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 China
| | - Jie Zhang
- State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 China
| | - Xiaoli Sun
- State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 China
| | - Huihui Li
- State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 China
| | - Shouke Yan
- State Key Laboratory of Chemical Resource Engineering; Beijing University of Chemical Technology; Beijing 100029 China
- Key Laboratory of Rubber-Plastics; Qingdao University of Science and Technology; Qingdao 266042 China
| | - Bernard Lotz
- Institut Charles Sadron; CNRS and Université de Strasbourg; 23, Rue du Loess 67034 Strasbourg France
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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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Investigation of Newly Prepared Biodegradable 32P-chromic Phosphate-polylactide-co-glycolide Seeds and Their Therapeutic Response Evaluation for Glioma Brachytherapy. CONTRAST MEDIA & MOLECULAR IMAGING 2018; 2018:2630480. [PMID: 29853804 PMCID: PMC5949199 DOI: 10.1155/2018/2630480] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 03/14/2018] [Indexed: 12/15/2022]
Abstract
32P high-dose rate brachytherapy allows high-dose radiation delivery to target lesions with less damage to adjacent tissues. The early evaluation of its therapeutic effect on tumours is vital for the optimization of treatment regimes. The most commonly used 32P-CP colloid tends to leak with blind therapeutic area after intratumour injection. We prepared 32P-chromic phosphate-polylactide-co-glycolide (32P-CP-PLGA) seeds with biodegradable PLGA as a framework and investigated their characteristics in vitro and in vivo. We also evaluated the therapeutic effect of 32P-CP-PLGA brachytherapy for glioma with the integrin αvβ3-targeted radiotracer 68Ga-3PRGD2. 32P-CP-PLGA seeds (seed group, SG, 185 MBq) and 32P-CP colloid (colloid group, CG, 18.5 MBq) were implanted or injected into human glioma xenografts in nude mice. Scanning electron microscopy (SEM) of the seeds, micro-SPECT imaging, and biodistribution studies were performed at different time points. The tumour volume was measured using a caliper, and 68Ga-3PRGD2 micro-PET-CT imaging was performed to evaluate the therapeutic effect after 32P intratumour administration. The delayed release of 32P-CP was observed with biodegradation of vehicle PLGA. Intratumoural effective half-life of 32P-CP in the SG (13.3 ± 0.3) d was longer than that in the CG (10.4 ± 0.3) d (P < 0.05), with liver appearance in the CG on SPECT. A radioactivity gradient developed inside the tumour in the SG, as confirmed by micro-SPECT and SEM. Tumour uptake of 68Ga-3PRGD2 displayed a significant increase on day 0.5 in the SG and decreased earlier (on day 2) than the volume reduction (on day 8). Thus, 32P-CP-PLGA seeds, controlling the release of entrapped 32P-CP particles, are promising for glioma brachytherapy, and 68Ga-3PRGD2 imaging shows potential for early response evaluation of 32P-CP-PLGA seeds brachytherapy.
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Composite PLA/PEG/nHA/Dexamethasone Scaffold Prepared by 3D Printing for Bone Regeneration. Macromol Biosci 2018; 18:e1800068. [DOI: 10.1002/mabi.201800068] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 03/20/2018] [Indexed: 11/07/2022]
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Effects of Pharmaceutical Preparations on the Rate of Degradation of Poly(Lactide-Co-Glycolide) Scaffolds. Pharm Chem J 2018. [DOI: 10.1007/s11094-018-1767-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Bakhshandeh B, Zarrintaj P, Oftadeh MO, Keramati F, Fouladiha H, Sohrabi-Jahromi S, Ziraksaz Z. Tissue engineering; strategies, tissues, and biomaterials. Biotechnol Genet Eng Rev 2018; 33:144-172. [PMID: 29385962 DOI: 10.1080/02648725.2018.1430464] [Citation(s) in RCA: 86] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Current tissue regenerative strategies rely mainly on tissue repair by transplantation of the synthetic/natural implants. However, limitations of the existing strategies have increased the demand for tissue engineering approaches. Appropriate cell source, effective cell modification, and proper supportive matrices are three bases of tissue engineering. Selection of appropriate methods for cell stimulation, scaffold synthesis, and tissue transplantation play a definitive role in successful tissue engineering. Although the variety of the players are available, but proper combination and functional synergism determine the practical efficacy. Hence, in this review, a comprehensive view of tissue engineering and its different aspects are investigated.
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Affiliation(s)
- Behnaz Bakhshandeh
- a Department of Biotechnology, College of Science , University of Tehran , Tehran , Iran
| | - Payam Zarrintaj
- b School of Chemical Engineering, College of Engineering , University of Tehran , Tehran , Iran
| | - Mohammad Omid Oftadeh
- a Department of Biotechnology, College of Science , University of Tehran , Tehran , Iran.,c Stem Cell Technology Research Center , Tehran , Iran
| | - Farid Keramati
- a Department of Biotechnology, College of Science , University of Tehran , Tehran , Iran
| | - Hamideh Fouladiha
- a Department of Biotechnology, College of Science , University of Tehran , Tehran , Iran
| | - Salma Sohrabi-Jahromi
- d Gottingen Center for Molecular Biosciences , Georg August University , Göttingen , Germany
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Xie R, Hu J, Hoffmann O, Zhang Y, Ng F, Qin T, Guo X. Self-fitting shape memory polymer foam inducing bone regeneration: A rabbit femoral defect study. Biochim Biophys Acta Gen Subj 2018; 1862:936-945. [PMID: 29360569 DOI: 10.1016/j.bbagen.2018.01.013] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 01/17/2018] [Accepted: 01/18/2018] [Indexed: 02/05/2023]
Abstract
Although tissue engineering has been attracted greatly for healing of critical-sized bone defects, great efforts for improvement are still being made in scaffold design. In particular, bone regeneration would be enhanced if a scaffold precisely matches the contour of bone defects, especially if it could be implanted into the human body conveniently and safely. In this study, polyurethane/hydroxyapatite-based shape memory polymer (SMP) foam was fabricated as a scaffold substrate to facilitate bone regeneration. The minimally invasive delivery and the self-fitting behavior of the SMP foam were systematically evaluated to demonstrate its feasibility in the treatment of bone defects in vivo. Results showed that the SMP foam could be conveniently implanted into bone defects with a compact shape. Subsequently, it self-matched the boundary of bone defects upon shape-recovery activation in vivo. Micro-computed tomography determined that bone ingrowth initiated at the periphery of the SMP foam with a constant decrease towards the inside. Successful vascularization and bone remodeling were also demonstrated by histological analysis. Thus, our results indicate that the SMP foam demonstrated great potential for bone regeneration.
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Affiliation(s)
- Ruiqi Xie
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Jinlian Hu
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China; Intelligent Biomedical Materials Center, Shenzhen Base of The Hong Kong Polytechnic University, Shenzhen, China.
| | - Oskar Hoffmann
- Institute of Pharmacology and Toxicology, University of Vienna, Vienna, Austria
| | - Yuanchi Zhang
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Frankie Ng
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
| | - Tingwu Qin
- Institute of Stem Cell and Tissue Engineering, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, Chengdu, China
| | - Xia Guo
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
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Negrin M, Macerata E, Consolati G, Quasso F, Genovese L, Soccio M, Giola M, Lotti N, Munari A, Mariani M. Gamma radiation effects on random copolymers based on poly(butylene succinate) for packaging applications. Radiat Phys Chem Oxf Engl 1993 2018. [DOI: 10.1016/j.radphyschem.2017.05.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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48
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The Effect of Fluid Shear Stress on the In Vitro Release Kinetics of Sirolimus from PLGA Films. Polymers (Basel) 2017; 9:polym9110618. [PMID: 30965925 PMCID: PMC6418679 DOI: 10.3390/polym9110618] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 10/31/2017] [Accepted: 11/10/2017] [Indexed: 12/27/2022] Open
Abstract
Drug-carrying coatings of stents implanted in blood vessels are exposed to various blood flows. This study investigated the effect of fluid shear stress on the in vitro release kinetics of sirolimus from poly(lactic-co-glycolic acid) (PLGA) films. The homemade parallel plate flow chamber was used to exert quantitative shear stress on the sirolimus-carrying film. By adjusting the flow rate of the release media in the chamber, three levels of shear stress (3.6, 12.0, and 36.0 dyn/cm²) were respectively applied. For each level of shear stress employed, the release kinetics of sirolimus from the PLGA films exhibited a four-phase profile: an initial burst release phase (Phase I), a lag phase (Phase II), a second burst release phase (Phase III), and a terminal release phase (Phase IV). During Phases I and II, sirolimus was released slowly and in small amounts (<10%); however, during Phases III and IV, the drug release increased considerably. Comparisons of different shear stresses indicated that greater shear stress resulted in earlier and faster sirolimus release, with more cumulative drug release observed. PLGA film degradations (molecular weight reduction, mass loss, and surface topographical variations) were also investigated to better explain the observed drug release behavior. Consequently, fluid shear stress was found to significantly accelerate the release of sirolimus from the PLGA matrices. Therefore, this study could provide a practical method for evaluating the in vitro drug release from polymer matrices under uniform shear stress, and might help improve the design of biodegradable coatings on drug-eluting stents.
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Xie W, Gao Q, Guo Z, Wang D, Gao F, Wang X, Wei Y, Zhao L. Injectable and Self-Healing Thermosensitive Magnetic Hydrogel for Asynchronous Control Release of Doxorubicin and Docetaxel to Treat Triple-Negative Breast Cancer. ACS APPLIED MATERIALS & INTERFACES 2017; 9:33660-33673. [PMID: 28901139 DOI: 10.1021/acsami.7b10699] [Citation(s) in RCA: 109] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Integration of two or more drugs into a multiagent delivery system has been considered to have profound impact on both in vitro and in vivo cancer treatment due to their efficient synergistic effect. This study presents a cheap and simple chitosan hydrogel cross-linked with telechelic difunctional poly(ethylene glycol) (DF-PEG-DF) for synthesis of an injectable and self-healing thermosensitive dual-drug-loaded magnetic hydrogel (DDMH), which contains both doxorubicin (DOX) and docetaxel (DTX) for chemotherapy and iron oxide for magnetic hyperthermia induced stimuli responsive drug release. The as-prepared DDMH not only have good biocompatibility but also exhibit unique self-healing, injectable, asynchronous control release properties. Meanwhile, it shows an excellent magnetic field responsive heat-inducing property, which means that DDMH will produce a large amount of heat to control the surrounding temperature under the alternative magnetic field (AMF). A remarkably improved synergistic effect to triple negative breast cancer cell line is obtained by comparing the therapeutic effect of codelivery of DOX and DTX/PLGA nanoparticles (DTX/PLGA NPs) with DOX or DTX/PLGA NPs alone. In vivo results showed that DDMH exhibited significant higher antitumor efficacy of reducing tumor size compared to single drug-loaded hydrogel. Meanwhile, the AMF-trigger control release of drugs in codelivery system has a more efficient antitumor effect of cancer chemotherapy, indicating that DDMH was a promising multiagent codelivery system for synergistic chemotherapy in the cancer treatment field.
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Affiliation(s)
- Wensheng Xie
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, China
- Key Laboratory of Advanced Materials, Ministry of Education of China, School of Materials Science & Engineering, Tsinghua University , Beijing 100084, China
| | - Qin Gao
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, China
- Key Laboratory of Advanced Materials, Ministry of Education of China, School of Materials Science & Engineering, Tsinghua University , Beijing 100084, China
| | - Zhenhu Guo
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, China
- Key Laboratory of Advanced Materials, Ministry of Education of China, School of Materials Science & Engineering, Tsinghua University , Beijing 100084, China
| | - Dan Wang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, China
- Key Laboratory of Advanced Materials, Ministry of Education of China, School of Materials Science & Engineering, Tsinghua University , Beijing 100084, China
| | - Fei Gao
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, China
- Key Laboratory of Advanced Materials, Ministry of Education of China, School of Materials Science & Engineering, Tsinghua University , Beijing 100084, China
| | - Xiumei Wang
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, China
- Key Laboratory of Advanced Materials, Ministry of Education of China, School of Materials Science & Engineering, Tsinghua University , Beijing 100084, China
| | - Yen Wei
- Department of Chemistry, Tsinghua University , Beijing 100084, China
| | - Lingyun Zhao
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, China
- Key Laboratory of Advanced Materials, Ministry of Education of China, School of Materials Science & Engineering, Tsinghua University , Beijing 100084, China
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50
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Ginjupalli K, Shavi GV, Averineni RK, Bhat M, Udupa N, Nagaraja Upadhya P. Poly(α-hydroxy acid) based polymers: A review on material and degradation aspects. Polym Degrad Stab 2017. [DOI: 10.1016/j.polymdegradstab.2017.08.024] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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