1
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Shahjin F, Patel M, Hasan M, Cohen JD, Islam F, Ashaduzzaman M, Nayan MU, Subramaniam M, Zhou Y, Andreu I, Gendelman HE, Kevadiya BD. Development of a porous layer-by-layer microsphere with branched aliphatic hydrocarbon porogens. NANOMEDICINE : NANOTECHNOLOGY, BIOLOGY, AND MEDICINE 2023; 48:102644. [PMID: 36549555 PMCID: PMC10460474 DOI: 10.1016/j.nano.2022.102644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Revised: 11/22/2022] [Accepted: 12/10/2022] [Indexed: 12/24/2022]
Abstract
Porous polymer microspheres are employed in biotherapeutics, tissue engineering, and regenerative medicine. Porosity dictates cargo carriage and release that are aligned with the polymer physicochemical properties. These include material tuning, biodegradation, and cargo encapsulation. How uniformity of pore size affects therapeutic delivery remains an area of active investigation. Herein, we characterize six branched aliphatic hydrocarbon-based porogen(s) produced to create pores in single and multilayered microspheres. The porogens are composed of biocompatible polycaprolactone, poly(lactic-co-glycolic acid), and polylactic acid polymers within porous multilayered microspheres. These serve as controlled effective drug and vaccine delivery platforms.
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Affiliation(s)
- Farah Shahjin
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, USA
| | - Milankumar Patel
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, USA
| | - Mahmudul Hasan
- Department of Pharmaceutical Sciences, University of Nebraska Medical Center, Omaha, NE, USA
| | - Jacob D Cohen
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, USA
| | - Farhana Islam
- Department of Biochemistry and Molecular Biology, University of Nebraska Medical Center, Omaha, NE, USA
| | - Md Ashaduzzaman
- Computer Science, University of Nebraska-Omaha, Omaha, NE, USA
| | - Mohammad Ullah Nayan
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, USA
| | | | - You Zhou
- Center for Biotechnology, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Irene Andreu
- Department of Chemical Engineering, University of Rhode Island, Kingston, RI, USA
| | - Howard E Gendelman
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, USA.
| | - Bhavesh D Kevadiya
- Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, NE, USA
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2
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Bakhshi R, Mohammadi-Zerankeshi M, Mehrabi-Dehdezi M, Alizadeh R, Labbaf S, Abachi P. Additive manufacturing of PLA-Mg composite scaffolds for hard tissue engineering applications. J Mech Behav Biomed Mater 2023; 138:105655. [PMID: 36621086 DOI: 10.1016/j.jmbbm.2023.105655] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Revised: 12/27/2022] [Accepted: 01/01/2023] [Indexed: 01/04/2023]
Abstract
Polylactic acid (PLA) is considered as a great option to be employed as 3D porous scaffold in hard tissue engineering applications owing to its excellent biocompatibility and processability. However, relatively weak mechanical properties and inappropriate biodegradability limit its extensive usage. In order to overcome the mentioned challenges, micrometric magnesium particles were incorporated into the PLA matrix by the fused deposition modeling (FDM) technique. The effects of various Mg contents (i.e., 2, 4, 6, 8 and 10 wt%) on the structural, thermal, rheological, mechanical, wettability, degradability characteristics and cellular behavior of the 3D porous PLA-Mg composite scaffolds were examined. The developed PLA-Mg composites exhibit an interconnected porous structure with a mostly uniform distribution of Mg particles in the PLA matrix. It was found that incorporation of Mg particles into the PLA matrix enhances the mechanical, physical, chemical and biological characteristics of PLA. The cell studies demonstrate that the PLA-6Mg composite scaffold provides the best cellular response in terms of cell atachment and viability. The obtained results in this investigation greatly suggest that the 3D-printed PLA-Mg composite scaffold is a promising candidate for hard tissue engineering applications.
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Affiliation(s)
- Rasoul Bakhshi
- Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
| | | | - Melika Mehrabi-Dehdezi
- Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
| | - Reza Alizadeh
- Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran.
| | - Sheyda Labbaf
- Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
| | - Parvin Abachi
- Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran
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3
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Xia Q, Ye W, Zhang Q, Liu D, Gao S, Fan Z, Liu Q. Structure, properties, and in vitro degradation behavior of biodegradable poly(L‐lactic acid)‐trimethylene carbonate‐glycolide terpolymer. J Appl Polym Sci 2022. [DOI: 10.1002/app.52968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Qi Xia
- Department of Materials Science Fudan University Shanghai China
| | - Wuyou Ye
- Department of Materials Science Fudan University Shanghai China
| | - Qin Zhang
- Department of Materials Science Fudan University Shanghai China
| | - Dongyang Liu
- Department of Materials Science Fudan University Shanghai China
| | - Shida Gao
- Department of Materials Science Fudan University Shanghai China
| | - Zhongyong Fan
- Department of Materials Science Fudan University Shanghai China
| | - Qing Liu
- Beijing Advanced Medical Technologies, Ltd. Inc. Beijing China
- The Institute for Translational Nanomedicine, Shanghai East Hospital, The Institute for Biomedical Engineering and Nano Science Tongji University School of Medicine Shanghai China
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4
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Bonferoni MC, Caramella C, Catenacci L, Conti B, Dorati R, Ferrari F, Genta I, Modena T, Perteghella S, Rossi S, Sandri G, Sorrenti M, Torre ML, Tripodo G. Biomaterials for Soft Tissue Repair and Regeneration: A Focus on Italian Research in the Field. Pharmaceutics 2021; 13:pharmaceutics13091341. [PMID: 34575417 PMCID: PMC8471088 DOI: 10.3390/pharmaceutics13091341] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2021] [Revised: 08/23/2021] [Accepted: 08/25/2021] [Indexed: 12/22/2022] Open
Abstract
Tissue repair and regeneration is an interdisciplinary field focusing on developing bioactive substitutes aimed at restoring pristine functions of damaged, diseased tissues. Biomaterials, intended as those materials compatible with living tissues after in vivo administration, play a pivotal role in this area and they have been successfully studied and developed for several years. Namely, the researches focus on improving bio-inert biomaterials that well integrate in living tissues with no or minimal tissue response, or bioactive materials that influence biological response, stimulating new tissue re-growth. This review aims to gather and introduce, in the context of Italian scientific community, cutting-edge advancements in biomaterial science applied to tissue repair and regeneration. After introducing tissue repair and regeneration, the review focuses on biodegradable and biocompatible biomaterials such as collagen, polysaccharides, silk proteins, polyesters and their derivatives, characterized by the most promising outputs in biomedical science. Attention is pointed out also to those biomaterials exerting peculiar activities, e.g., antibacterial. The regulatory frame applied to pre-clinical and early clinical studies is also outlined by distinguishing between Advanced Therapy Medicinal Products and Medical Devices.
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Affiliation(s)
| | | | | | - Bice Conti
- Correspondence: (M.C.B.); (B.C.); (F.F.)
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5
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Biocompatibility, biodegradation and biomedical applications of poly(lactic acid)/poly(lactic-co-glycolic acid) micro and nanoparticles. JOURNAL OF PHARMACEUTICAL INVESTIGATION 2019. [DOI: 10.1007/s40005-019-00439-x] [Citation(s) in RCA: 187] [Impact Index Per Article: 37.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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6
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Nguyen Huynh NM, Boeva ZA, Smått JH, Pesonen M, Lindfors T. Reduced graphene oxide as a water, carbon dioxide and oxygen barrier in plasticized poly(vinyl chloride) films. RSC Adv 2018; 8:17645-17655. [PMID: 35542063 PMCID: PMC9080506 DOI: 10.1039/c8ra03080d] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 04/30/2018] [Indexed: 12/28/2022] Open
Abstract
Herein, we report the incorporation of a 10 μm thick reduced graphene oxide (RGO) barrier layer in a plasticized poly(vinyl chloride) (PVC) film as the main constituent in ion-selective membranes used in potentiometric solid-contact ion-selective electrodes (SCISE). Fourier transform infrared attenuated total reflection (FTIR-ATR) and oxygen transmission rate (OTR) measurements showed that the embedded RGO barrier efficiently impedes the diffusion of liquid water, carbon dioxide and oxygen (O2) through the 400 μm thick PVC film, which causes potential instability and irreproducibility of the SCISEs. The measurements revealed that the RGO layer completely blocks the carbon dioxide diffusion, while it fully blocks the water diffusion for 16 h and reduced the OTR by 85% on average. The μm-thick RGO films used in this study were easier to handle and incorporate into host polymers, and form more efficient and robust barriers compared to the mono-, few- and multilayer graphene commonly applied as barrier layers for liquids and gases. We also demonstrated that the FTIR-ATR technique employed in the permeability measurements is a versatile and very sensitive technique for studying the diffusion of small amounts of water and carbon dioxide through graphene-based thin films. A 10 μm-thick reduced graphene oxide barrier layer efficiently blocks water, carbon dioxide and oxygen diffusion through plasticized PVC.![]()
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Affiliation(s)
- Ngoc Minh Nguyen Huynh
- Åbo Akademi University
- Faculty of Science and Engineering
- Laboratory of Analytical Chemistry
- (Johan Gadolin Process Chemistry Centre, PCC)
- 20500 Åbo
| | - Zhanna A. Boeva
- Åbo Akademi University
- Faculty of Science and Engineering
- Laboratory of Analytical Chemistry
- (Johan Gadolin Process Chemistry Centre, PCC)
- 20500 Åbo
| | - Jan-Henrik Smått
- Åbo Akademi University
- Faculty of Science and Engineering
- Laboratory of Physical Chemistry (Center for Functional Materials, FUNMAT)
- 20500 Åbo
- Finland
| | - Markus Pesonen
- Åbo Akademi University
- Faculty of Science and Engineering
- Physics (Center for Functional Materials, FUNMAT)
- 20500 Åbo
- Finland
| | - Tom Lindfors
- Åbo Akademi University
- Faculty of Science and Engineering
- Laboratory of Analytical Chemistry
- (Johan Gadolin Process Chemistry Centre, PCC)
- 20500 Åbo
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7
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He L, Xu W, Wang X, Wang C, Ding J, Chen X. Polymer micro/nanocarrier-assisted synergistic chemohormonal therapy for prostate cancer. Biomater Sci 2018; 6:1433-1444. [PMID: 29620095 DOI: 10.1039/c8bm00190a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polymer micro/nanocarrier-assisted chemohormonal therapy upregulates chemotherapy efficacy and down-regulates hormone level, effectively inhibiting the progression of prostate cancer.
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Affiliation(s)
- Liang He
- Department of Urology
- the First Hospital of Jilin University
- Changchun 130021
- People's Republic of China
- Key Laboratory of Polymer Ecomaterials
| | - Weiguo Xu
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- People's Republic of China
| | - Xiaoqing Wang
- Department of Urology
- the First Hospital of Jilin University
- Changchun 130021
- People's Republic of China
| | - Chunxi Wang
- Department of Urology
- the First Hospital of Jilin University
- Changchun 130021
- People's Republic of China
| | - Jianxun Ding
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- People's Republic of China
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- People's Republic of China
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8
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Dorati R, De Trizio A, Marconi S, Ferrara A, Auricchio F, Genta I, Modena T, Benazzo M, Benazzo A, Volpato G, Conti B. Design of a Bioabsorbable Multilayered Patch for Esophagus Tissue Engineering. Macromol Biosci 2017; 17. [PMID: 28128890 DOI: 10.1002/mabi.201600426] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 12/22/2016] [Indexed: 12/18/2022]
Abstract
A gold standard for esophagus reconstruction is not still available. The present work aims to design a polymer patch combining synthetic polylactide-co-polycaprolacton and chitosan biopolymers, tailoring patch properties to esophageal tissue characteristics by a temperature-induced precipitation method, to get multilayered patches (1L, 2L, and 3L). Characterization shows stable multilayered patches (1L and 2L) by selection of copolymer type, and their M w . In vitro investigation of the functional patch properties in simulated physiologic and pathologic conditions demonstrates that the chitosan layer (patch 3L) decreases patch stability and cell adhesion, while improves cell proliferation. Patches 2L and 3L comply with physiological esophageal pressure (3-5 kPa) and elongation (20%).
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Affiliation(s)
- Rossella Dorati
- Department of Drug Sciences, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Antonella De Trizio
- Department of Drug Sciences, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Stefania Marconi
- Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 1, 27100, Pavia, Italy
| | - Anna Ferrara
- Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 1, 27100, Pavia, Italy
| | - Ferdinando Auricchio
- Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 1, 27100, Pavia, Italy
| | - Ida Genta
- Department of Drug Sciences, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Tiziana Modena
- Department of Drug Sciences, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Marco Benazzo
- Department of Otolaryngology/Head and Neck Surgery, University of Pavia, I.R.C.C.S. Policlinico S. Matteo, 27100, Pavia, Italy
| | - Alberto Benazzo
- Department of Thoracic Surgery, Medical University of Vienna, 1090, Vienna, Austria
| | - Gino Volpato
- Department of Otolaryngology/Head and Neck Surgery, University of Pavia, I.R.C.C.S. Policlinico S. Matteo, 27100, Pavia, Italy
| | - Bice Conti
- Department of Drug Sciences, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
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9
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du Toit LC, Choonara YE, Kumar P, Pillay V. Polymeric networks for controlled release of drugs: a patent review. Expert Opin Ther Pat 2016; 26:703-17. [DOI: 10.1080/13543776.2016.1178720] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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10
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Chen BY, Jing X, Mi HY, Zhao H, Zhang WH, Peng XF, Turng LS. Fabrication of polylactic acid/polyethylene glycol (PLA/PEG) porous scaffold by supercritical CO2
foaming and particle leaching. POLYM ENG SCI 2015. [DOI: 10.1002/pen.24073] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Bin-Yi Chen
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology; Guangzhou 510640 China
| | - Xin Jing
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology; Guangzhou 510640 China
- Department of Mechanical Engineering; University of Wisconsin-Madison; Madison Wisconsin 53706
| | - Hao-Yang Mi
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology; Guangzhou 510640 China
| | - Haibin Zhao
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology; Guangzhou 510640 China
- School of Materials Science and Engineering, Shandong University; Jinan Shandong 250061 China
| | - Wen-Hao Zhang
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology; Guangzhou 510640 China
| | - Xiang-Fang Peng
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology; Guangzhou 510640 China
| | - Lih-Sheng Turng
- Department of Mechanical Engineering; University of Wisconsin-Madison; Madison Wisconsin 53706
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11
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Electrospun antibacterial nanofibrous polyvinylpyrrolidone/cetyltrimethylammonium bromide membranes for biomedical applications. J BIOACT COMPAT POL 2014. [DOI: 10.1177/0883911514535153] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Nanoscale structures with large surface area-to-volume ratios are used as biomaterial scaffolds for vascular grafts, wound dressings, and air purifying filters. Using electrospinning, nanofibers containing an antibacterial agent, cetyltrimethylammonium bromide, were prepared for wound healing application. Polyvinylpyrrolidone, known as a biocompatible additive in food and drug industries, has been used as fiber processing agent with the organic active ingredient, cetyltrimethylammonium bromide. A series of samples with different polyvinylpyrrolidone/ cetyltrimethylammonium bromide ratios were successfully prepared by this method. The morphology and electroactive characteristics of nanofibers were investigated using scanning electron microscopy, atomic force microscopy, and electrochemical impedance spectroscopy. Fiber diameters and charge transfer resistances were found to decrease with salt content, while the double-layer capacitance increased with no apparent effect on the specific capacitance providing favorable conditions for the fabrication of biomaterials. In addition, the quaternary ammonium compound (cetyltrimethylammonium bromide) with a minimum ratio of 2.5 wt% showed reduction in bacterial activity of Klebsiella pneumonia, Staphylococcus aureus, and Escherichia coli.
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12
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Santos A, Sinn Aw M, Bariana M, Kumeria T, Wang Y, Losic D. Drug-releasing implants: current progress, challenges and perspectives. J Mater Chem B 2014; 2:6157-6182. [DOI: 10.1039/c4tb00548a] [Citation(s) in RCA: 91] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
This review presents the different types and concepts of drug-releasing implants using new nanomaterials and nanotechnology-based devices.
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Affiliation(s)
- Abel Santos
- School of Chemical Engineering
- The University of Adelaide
- 5005 Adelaide, Australia
| | - Moom Sinn Aw
- School of Chemical Engineering
- The University of Adelaide
- 5005 Adelaide, Australia
| | - Manpreet Bariana
- School of Chemical Engineering
- The University of Adelaide
- 5005 Adelaide, Australia
- School of Dentistry
- The University of Adelaide
| | - Tushar Kumeria
- School of Chemical Engineering
- The University of Adelaide
- 5005 Adelaide, Australia
| | - Ye Wang
- School of Chemical Engineering
- The University of Adelaide
- 5005 Adelaide, Australia
| | - Dusan Losic
- School of Chemical Engineering
- The University of Adelaide
- 5005 Adelaide, Australia
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13
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Bhushan B, Schricker SR. A review of block copolymer-based biomaterials that control protein and cell interactions. J Biomed Mater Res A 2013; 102:2467-80. [PMID: 23893878 DOI: 10.1002/jbm.a.34887] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 07/11/2013] [Accepted: 07/17/2013] [Indexed: 11/07/2022]
Abstract
Block copolymers posses the ability to phase separate into micro and nanoscale patterns resulting in nonhomogeneous surfaces and solids. This nonhomogeneity has been harnessed to improve mechanical properties, control degradation, and add functionality to biomaterials. The ability of block copolymers to generate a wide variety of surface chemistries and morphologies can also be harnessed to control protein adsorption, protein conformation, and cell adhesion. Proteins and cells will respond to periodically structured surfaces, so block copolymers have a great deal of potential as biomaterials. This review will explore the ability of block copolymers to control specific biological responses such as cell adhesion, protein adsorption and conformation, parameters that govern the overall host response to a material. In addition, some of the specific applications of block copolymer, antithrombogenic materials and their ability to pattern proteins, will be discussed.
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Affiliation(s)
- Bharat Bhushan
- Nanoprobe Laboratory for Bio- and Nanotechnology and Biomimetics, The Ohio State University, Columbus, Ohio, 43210
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14
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Chen F, Yin G, Liao X, Yang Y, Huang Z, Gu J, Yao Y, Chen X, Gao H. Preparation, characterization and in vitro release properties of morphine-loaded PLLA-PEG-PLLA microparticles via solution enhanced dispersion by supercritical fluids. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2013; 24:1693-1705. [PMID: 23625317 DOI: 10.1007/s10856-013-4926-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Accepted: 04/04/2013] [Indexed: 06/02/2023]
Abstract
Morphine-loaded poly(L-lactide)-poly(ethylene glycol)-poly(L-lactide) (PLLA-PEG-PLLA) microparticles were prepared using solution enhanced dispersion by supercritical CO2 (SEDS). The effects of process variables on the morphology, particles size, drug loading (DL), encapsulation efficiency and release properties of the microparticles were investigated. All particles showed spherical or ellipsoidal shape with the mean diameter of 2.04-5.73 μm. The highest DL of 17.92 % was obtained when the dosage ratio of morphine to PLLA-PEG-PLLA reached 1:5, and the encapsulation efficiency can be as high as 87.31 % under appropriate conditions. Morphine-loaded PLLA-PEG-PLLA microparticles displayed short-term release with burst release followed by sustained release within days or long-term release lasted for weeks. The degradation test of the particles showed that the degradation rate of PLLA-PEG-PLLA microparticles was faster than that of PLLA microparticles. The results collectively suggest that PLLA-PEG-PLLA can be a promising candidate polymer for the controlled release system.
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Affiliation(s)
- Fu Chen
- College of Materials Science and Engineering, Sichuan University, No.24, South 1st Section, 1st Ring Road, Chengdu, 610065, Sichuan, People's Republic of China
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15
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Zhang W, Chen B, Zhao H, Yu P, Fu D, Wen J, Peng X. Processing and characterization of supercritical CO2batch foamed poly(lactic acid)/poly(ethylene glycol) scaffold for tissue engineering application. J Appl Polym Sci 2013. [DOI: 10.1002/app.39523] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Wenhao Zhang
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing; South China University of Technology; Guangzhou; 510640; China
| | - Binyi Chen
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing; South China University of Technology; Guangzhou; 510640; China
| | - Haibin Zhao
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing; South China University of Technology; Guangzhou; 510640; China
| | - Peng Yu
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing; South China University of Technology; Guangzhou; 510640; China
| | - Dajiong Fu
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing; South China University of Technology; Guangzhou; 510640; China
| | - Jinsong Wen
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing; South China University of Technology; Guangzhou; 510640; China
| | - Xiangfang Peng
- The Key Laboratory of Polymer Processing Engineering of Ministry of Education; National Engineering Research Center of Novel Equipment for Polymer Processing; South China University of Technology; Guangzhou; 510640; China
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16
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Gaignaux A, Réeff J, De Vriese C, Goole J, Amighi K. Evaluation of the degradation of clonidine-loaded PLGA microspheres. J Microencapsul 2013; 30:681-91. [PMID: 23544878 DOI: 10.3109/02652048.2013.778905] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONTEXT The release of an encapsulated drug is dependent on diffusion and/or degradation/erosion processes. OBJECTIVE This work aimed to better understand the degradation mechanism of clonidine-loaded microparticles. METHODS Gel permeation chromatography was used to evaluate the degradation of the polymer. The water-uptake and the weight loss were determined gravimetrically. The swelling behaviour and the morphological changes of the formulations were observed by microscopy. The glass transition temperature and the crystallinity were also determined by differential scanning calorimetry and X-ray diffraction, respectively. The pH of the medium and inside the microspheres was assessed. RESULTS The microspheres captured a large amount of water, allowing a decrease in the molecular weight of the polymer. The pH of the medium decreased after release of the degradation products and the pH inside the microparticles remained constant due to the neutralization of these acidic products. CONCLUSION Clonidine and buffers both had an action on the degradation.
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Affiliation(s)
- Amélie Gaignaux
- Laboratory of Pharmaceutics and Biopharmaceutics, Université Libre de Bruxelles , City of Brussels , Belgium
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17
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Ye L, Guan X, Tian J, Zhang J, Du G, Yu X, Yu P, Cen X, Liu W, Li Y. Three-month subchronic intramuscular toxicity study of rotigotine-loaded microspheres in SD rats. Food Chem Toxicol 2013; 56:81-92. [PMID: 23454207 DOI: 10.1016/j.fct.2013.02.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2012] [Revised: 10/10/2012] [Accepted: 02/10/2013] [Indexed: 12/18/2022]
Abstract
Continuous dopaminergic stimulation (CDS) has been an important strategy of drug development for the treatment of Parkinson's disease (PD). Rotigotine is a non-ergoline D3/D2/D1 dopamine agonist for treating PD. As a new treatment option for CDS, rotigotine-loaded microspheres (RoMS), a long-acting sustained-release microspheres for injection with poly(lactide-co-glycolide) as drug carrier, are now being evaluated in clinical trial. In this study, subchronic toxicity of RoMS in SD rats has been characterized via intramuscular administration with RoMS (0-240 mg/kg/week) on a consecutive weekly dosing schedule for 3 months followed by 1-month recovery period. The No Observed Adverse Effect Level (NOAEL) was 45 mg/kg/week. One male at 240 mg/kg died from an extensive pulmonary embolism. The major toxicological effects were associated with the dopamine agonist-related pharmacodynamic properties of rotigotine (e.g. hyperactivity and stereotype, enlarged ovary, sporadic gastric mucous membrane lesions, decreased body weight, food consumption and prolactin, and increased mononuclear cell, neutrophil granulocyte, aspartate aminotransferase and alanine aminotransferase) and foreign body removal reaction induced by poly(lactide-co-glycolide) and carboxymethycellulose sodium. At the end of recovery period, all findings had recovered to a normal level or to a certain degree except foreign body reaction at injection sites. RoMS has exhibited high safety on SD rats.
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Affiliation(s)
- Liang Ye
- School of Pharmacy, Yantai University & State Key Laboratory of Long-acting and Targeting Drug Delivery Technologies, Yantai, Shandong 264003, PR China.
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Bazzo GC, Macedo ATD, Crenca JP, Silva VE, Pereira EM, Zétola M, Pezzini BR. Microspheres prepared with biodegradable PHBV and PLA polymers as prolonged-release system for ibuprofen: in vitro drug release and in vivo evaluation. BRAZ J PHARM SCI 2012. [DOI: 10.1590/s1984-82502012000400021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
In this study, poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) and poly(l-lactide) (PLA) microspheres containing ibuprofen were prepared with the aim of prolonging the drug release. The oil-in-water (O/W) emulsion solvent evaporation technique was used, varying the polymer ratio. All formulations provided spherical particles with drug crystals on the surface and a porous and rough polymeric matrix when PHBV was used and smooth external surface when prepared with PLA. The in vitro dissolution profiles show that the formulation containing PHBV/PLA at the proportion of 30/70 presented the best results in terms of prolonging the ibuprofen release. The analysis of the concentration of ibuprofen in the blood of rats showed that maximum levels were achieved at between one and two hours after administration of the immediate-release form (pure drug), while the prolonged microspheres led to a small amount of the drug being released within the first two hours and reached the maximum level after six hours of administration. It was concluded that it is possible to prolong the release of ibuprofen through its incorporation into PHBV/PLA microspheres.
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Tian J, Du G, Ye L, Yu X, Zhang J, Wang H, Yu P, Fu F, Liu W, Li Y, Cen X, Guan X. Three-month subchronic intramuscular toxicity study of rotigotine-loaded microspheres in Cynomolgus monkeys. Food Chem Toxicol 2012; 52:143-52. [PMID: 23165154 DOI: 10.1016/j.fct.2012.11.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Revised: 11/03/2012] [Accepted: 11/07/2012] [Indexed: 10/27/2022]
Abstract
Continuous dopaminergic stimulation (CDS) is an important drug development strategy in the treatment of Parkinson's disease (PD). Rotigotine is a non-ergoline D(3)/D(2)/D(1) dopamine receptor agonist for treating PD. As a new treatment option for CDS, rotigotine-loaded microspheres (RoMS), long-acting sustained-release microspheres with poly(lactide-co-glycolide) as drug carrier, are now being evaluated in clinical trial. In the present study, the subchronic toxicity in Cynomolgus monkeys has been characterized via intramuscular administration with RoMS at 0, 10, 40 and 160 mg/kg, weekly for 3 months with a 1-month recovery period. The NOAEL was 10 mg/kg/week. One male at 160 mg/kg died from an extensive pulmonary embolism. The major toxicological effects were associated with dopamine agonist-related pharmacodynamic properties of rotigotine (e.g., hyperactivity and stereotype, decreased serum prolactin level) and foreign body removal reaction induced by poly(lactide-co-glycolide) and carboxymethycellulose sodium (e.g., increased mononuclear cells and neutrophils, thymus atrophy and vacuolar degeneration of adrenal cortex, foreign body granuloma with foam cells accumulation at injection sites and foam cells accumulation in spleen and multiple lymph sinuses). At the end of recovery period, above findings recovered to a normal level or to a certain degree except vacuolar degeneration of adrenal gland. RoMS has exhibited high safety on monkeys.
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Affiliation(s)
- Jingwei Tian
- School of Pharmacy, Yantai University & State Key Laboratory of Long-acting and Targeting Drug Delivery Technologies, Yantai, Shandong 264003, PR China.
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20
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BIOMINERALIZATION ON COPOLYMERIC MICROSPHERES SURFACE WITH DIFFERENT FUNCTIONAL GROUPS AND COMPOSITION. ACTA POLYM SIN 2012. [DOI: 10.3724/sp.j.1105.2012.12132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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21
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Li X, Murthy NS, Latour RA. The Structure of Hydrated Poly (D, L - Lactic Acid) Studied With X-Ray Diffraction and Molecular Simulation Methods. Macromolecules 2012; 45:4896-4906. [PMID: 22707795 PMCID: PMC3374654 DOI: 10.1021/ma3004778] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effect of hydration on the molecular structure of amorphous poly (D, L-lactic acid) (PDLLA) with 50:50 L-to-D ratio has been studied by combining experiments with molecular simulations. X-ray diffraction measurements revealed significant changes upon hydration in the structure functions of the copolymer. Large changes in the structure functions at ~ 10 days of incubation coincided with the large increase in the water uptake from ~1 to ~40% and the formation of voids in the film. Computer modeling based on the recently developed TIGER2/TIGER3 mixed sampling scheme was used to interpret these changes by efficiently equilibrating both dry and hydrated models of PDLLA. Realistic models of bulk amorphous PDLLA structure were generated as demonstrated by close agreement between the calculated and the experimental structure functions. These molecular simulations were used to identify the interactions between water and the polymer at the atomic level including the change of positional order between atoms in the polymer due to hydration. Changes in the partial O-O structure functions, about 95% of which were due to water-polymer interactions, were apparent in the radial distribution functions. These changes, and somewhat smaller changes in the C-C and C-O partial structure functions, clearly demonstrated the ability of the model to capture the hydrogen bonding interactions between water and the polymer, with the probability of water forming hydrogen bonds with the carbonyl oxygen of the ester group being about four times higher than with its ether oxygen.
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Affiliation(s)
- Xianfeng Li
- Department of Bioengineering, Clemson University, Clemson, South Carolina 29634, United States
| | - N. Sanjeeva Murthy
- New Jersey Center for Biomaterials, Rutgers University, Piscataway, New Jersey 08854, United States
| | - Robert A. Latour
- Department of Bioengineering, Clemson University, Clemson, South Carolina 29634, United States
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Luk A, Murthy N, Wang W, Rojas R, Kohn J. Study of nanoscale structures in hydrated biomaterials using small-angle neutron scattering. Acta Biomater 2012; 8:1459-68. [PMID: 22227373 DOI: 10.1016/j.actbio.2011.12.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Revised: 12/15/2011] [Accepted: 12/18/2011] [Indexed: 10/14/2022]
Abstract
Distribution of water in three classes of biomedically relevant and degradable polymers was investigated using small-angle neutron scattering. In semicrystalline polymers, such as poly(lactic acid) and poly(glycolic acid), water was found to diffuse preferentially into the non-crystalline regions. In amorphous polymers, such as poly(d,l-lactic acid) and poly(lactic-co-glycolic acid), the scattering after 7 days of incubation was attributed to water in microvoids that form following the hydrolytic degradation of the polymer. In amorphous copolymers containing hydrophobic segments (desaminotyrosyl-tyrosine ethyl ester) and hydrophilic blocks (poly(ethylene glycol) (PEG)), a sequence of distinct regimes of hydration were observed: homogeneous distribution (∼10Å length scales) at <13 wt.% PEG (∼1 water per EG), clusters of hydrated domains (∼50Å radius) separated at 24 wt.% PEG (1-2 water per EG), uniformly distributed hydrated domains at 41 wt.% PEG (∼4 water per EG) and phase inversion at >50 wt.% PEG (>6 water per EG). Increasing the PEG content increased the number of these domains with only a small decrease in distance between the domains. These discrete domains appeared to coalesce to form submicron droplets at ∼60°C, above the melting temperature of crystalline PEG. The significance of such observations on the evolution of micrometer-size channels that form during hydrolytic erosion is discussed.
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Jamshidian M, Arab Tehrany E, Cleymand F, Leconte S, Falher T, Desobry S. Effects of synthetic phenolic antioxidants on physical, structural, mechanical and barrier properties of poly lactic acid film. Carbohydr Polym 2012. [DOI: 10.1016/j.carbpol.2011.09.089] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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24
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Murthy NS, Wang W, Kohn J. Microphase separation in copolymers of hydrophilic PEG blocks and hydrophobic tyrosine-derived segments using simultaneous SAXS/WAXS/DSC. POLYMER 2010; 51:3978-3988. [PMID: 20802835 PMCID: PMC2927231 DOI: 10.1016/j.polymer.2010.06.024] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Hydration- and temperature-induced microphase separations were investigated by simultaneous small- and wide-angle X-ray scattering (SAXS and WAXS) and differential scanning calorimetry (DSC) in a family of copolymers in which hydrophilic poly(ethylene glycol) (PEG) blocks are inserted randomly into a hydrophobic polymer made of either desaminotyrosyl-tyrosine ethyl ester (DTE) or iodinated I(2)DTE segments. Iodination of the tyrosine rings in I(2)DTE increased the X-ray contrast between the hydrophobic and hydrophilic segments in addition to facilitating the study of the effect of iodination on microphase separation. The formation of phase-separated, hydrated PEG domains is of considerable significance as it profoundly affects the polymer properties. The copolymers of DTE (or I(2)DTE) and PEG are a useful model system and the findings presented here may be applicable to other PEG-containing random copolymers as well. In copolymers of PEG and DTE and I(2)DTE, the presence of PEG depressed the glass transition temperature (T(g)) of the copolymer relative to the homopolymer, poly(DTE carbonate), and the DTE/ I(2)DTE segments hindered the crystallization of the PEG segments. In the dry state, at large PEG fractions (> 70 vol%), the PEG domains self-assembled into an ordered structure with 14-18 nm distance between the domains. These domains gave rise to a SAXS peak at all temperatures in the iodinated polymers, but only above the T(g) in non-iodinated polymers, due to the unexpected contrast- match between the crystalline PEG domains and the glassy DTE segments. Irrespective of whether PEG was crystalline or not, immersion of these copolymers in water resulted in the formation of hydrated PEG domains that were 10-20 nm apart. Since both water and the polymer chains must be mobile for the phase separation to occur, the PEG domains disappeared when the water froze, and reappeared as the ice began to melt. This transformation was reversible, and showed hysteresis as did the melting of ice and freezing of the water incorporated into the polymer. PEG-water complexes and PEG-water eutectics were observed in WAXS and DSC scans, respectively.
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Affiliation(s)
- N S Murthy
- New Jersey Center for Biomaterials, Rutgers University, Piscataway, NJ 08854
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Fu Y, Kao WJ. Drug release kinetics and transport mechanisms of non-degradable and degradable polymeric delivery systems. Expert Opin Drug Deliv 2010; 7:429-44. [PMID: 20331353 DOI: 10.1517/17425241003602259] [Citation(s) in RCA: 719] [Impact Index Per Article: 51.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
IMPORTANCE OF THE FIELD The advancement in material design and engineering has led to the rapid development of new materials with increasing complexity and functions. Both non-degradable and degradable polymers have found wide applications in the controlled delivery field. Studies on drug release kinetics provide important information into the function of material systems. To elucidate the detailed transport mechanism and the structure-function relationship of a material system, it is critical to bridge the gap between the macroscopic data and the transport behavior at the molecular level. AREAS COVERED IN THIS REVIEW The structure and function information of selected non-degradable and degradable polymers have been collected and summarized from literature published after the 1990s. The release kinetics of selected drug compounds from various material systems is discussed in case studies. Recent progress in the mathematical models based on different transport mechanisms is highlighted. WHAT THE READER WILL GAIN This article aims to provide an overview of structure-function relationships of selected non-degradable and degradable polymers as drug delivery matrices. TAKE HOME MESSAGE Understanding the structure-function relationship of the material system is key to the successful design of a delivery system for a particular application. Moreover, developing complex polymeric matrices requires more robust mathematical models to elucidate the solute transport mechanisms.
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Affiliation(s)
- Yao Fu
- University of Wisconsin-Madison, School of Pharmacy, 777 Highland Avenue, Madison, WI 53705, USA
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Effect of porogen on the physico-chemical properties and degradation performance of PLGA scaffolds. Polym Degrad Stab 2010. [DOI: 10.1016/j.polymdegradstab.2009.11.039] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Zhang Y, Sun P, Gan Z. Biodegradable amphiphilic block copolymers containing functionalized PEO blocks: Controlled synthesis and biomedical potentials. Sci China Chem 2010. [DOI: 10.1007/s11426-010-0095-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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28
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Shi D, Matsusaki M, Akashi M. Unique size-change behavior of photo-crosslinked cinnamic acid derivative nanoparticles during hydrolytic degradation. Macromol Biosci 2009; 9:248-55. [PMID: 18989848 DOI: 10.1002/mabi.200800171] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
A unique size change of photo-crosslinkable poly[(3,4-dihydroxycinnamic acid)-co-(4-hydroxycinnamic acid)] nanoparticles was observed during hydrolytic degradation depending on the crosslinking degree. The diameter of uncrosslinked nanoparticles decreased from 850 to 300 nm during hydrolysis, whereas that of 75% crosslinked nanoparticles increased from 700 to 950 nm. The diameter changes of crosslinked nanoparticles during hydrolysis might be induced by swelling of the crosslinked networks depending on the crosslinking degree. Moreover, the diameter of the uncrosslinked nanoparticle recovered by additional UV irradiation during hydrolysis. These results suggested that the diameter of the nanoparticles could be controlled even during hydrolysis by UV irradiation.
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Affiliation(s)
- Dongjian Shi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan
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29
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Wang Y, Tan Y, Huang X, Che Y, Du X. Synthesis of biodegradable amphiphilic thermo-responsive multiblock polycarbonate and its self-aggregation behavior in aqueous solution. J Appl Polym Sci 2009. [DOI: 10.1002/app.29512] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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30
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In vitro degradation and release behavior of porous poly(lactic acid) scaffolds containing chitosan microspheres as a carrier for BMP-2-derived synthetic peptide. Polym Degrad Stab 2009. [DOI: 10.1016/j.polymdegradstab.2008.11.008] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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31
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Effects of ionizing radiation sterilization on microparticulate drug delivery systems based on poly-α-hydroxyacids: an overview. J Drug Deliv Sci Technol 2009. [DOI: 10.1016/s1773-2247(09)50017-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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32
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Rothstein SN, Federspiel WJ, Little SR. A unified mathematical model for the prediction of controlled release from surface and bulk eroding polymer matrices. Biomaterials 2008; 30:1657-64. [PMID: 19101031 DOI: 10.1016/j.biomaterials.2008.12.002] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2008] [Accepted: 12/01/2008] [Indexed: 10/21/2022]
Abstract
A unified model has been developed to predict release not only from bulk eroding and surface eroding systems but also from matrices that transition from surface eroding to bulk eroding behavior during the course of degradation. This broad applicability is afforded by fundamental diffusion/reaction equations that can describe a wide variety of scenarios including hydration of and mass loss from a hydrolysable polymer matrix. Together, these equations naturally account for spatial distributions of polymer degradation rate. In this model paradigm, the theoretical minimal size required for a matrix to exhibit degradation under surface eroding conditions was calculated for various polymer types and then verified by empirical data from the literature. An additional set of equations accounts for dissolution- and/or degradation-based release, which are dependent upon hydration of the matrix and erosion of the polymer. To test the model's accuracy, predictions for agent egress were compared to experimental data from polyanhydride and polyorthoester implants that were postulated to undergo either dissolution-limited or degradation-controlled release. Because these predictions are calculated solely from readily attainable design parameters, it seems likely that this model could be used to guide the design controlled release formulations that produce a broad array of custom release profiles.
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Affiliation(s)
- Sam N Rothstein
- Department of Chemical Engineering, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA 15203, USA
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Shi D, Matsusaki M, Kaneko T, Akashi M. Photo-Cross-Linking and Cleavage Induced Reversible Size Change of Bio-Based Nanoparticles. Macromolecules 2008. [DOI: 10.1021/ma800648e] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Dongjian Shi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan
| | - Michiya Matsusaki
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan
| | - Tatsuo Kaneko
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan
| | - Mitsuru Akashi
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamada-oka, Suita 565-0871, Japan
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Wu CB, Hao JY, Deng XM, Li XH. Copolymer of tetraethylenepentamine and ethylene glycol diacrylate: Synthesis and degradation. Polym Degrad Stab 2008. [DOI: 10.1016/j.polymdegradstab.2008.01.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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35
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Fan YB, Li P, Zeng L, Huang XJ. Effects of mechanical load on the degradation of poly(d,l-lactic acid) foam. Polym Degrad Stab 2008. [DOI: 10.1016/j.polymdegradstab.2007.12.015] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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