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Heydari-Majd M, Ghanbarzadeh B, Shahidi-Noghabi M, Najafi MA, Hosseini M. A new active nanocomposite film based on PLA/ZnO nanoparticle/essential oils for the preservation of refrigerated Otolithes ruber fillets. Food Packag Shelf Life 2019. [DOI: 10.1016/j.fpsl.2018.12.002] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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2
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Yu B, Meng L, Fu S, Zhao Z, Liu Y, Wang K, Fu Q. Morphology and internal structure control over PLA microspheres by compounding PLLA and PDLA and effects on drug release behavior. Colloids Surf B Biointerfaces 2018; 172:105-112. [PMID: 30142528 DOI: 10.1016/j.colsurfb.2018.08.037] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2018] [Revised: 08/10/2018] [Accepted: 08/17/2018] [Indexed: 12/15/2022]
Abstract
The applications of Polylactide (PLA) microspheres in biomedical areas are greatly determined by the size, morphology and internal structure. Taking advantage of the formation of stereocomplex (SC) crystallites between poly(L-lactide) (PLLA) and poly(D-lactide) (PDLA), we propose a facile strategy to prepare PLA microspheres with tunable morphology and crystalline structure by compounding PLLA and PDLA. With increasing PDLA content, the crystallinity of SC-PLA rose gradually until the ratio of PLLA and PDLA reached 1:1 and then fell. Correspondingly, the morphology of the microspheres were varied (smooth, porous, golf-ball like, guava like) and higher crystallinity of SC-PLA would lead to a more coarse and porous structure. Finally, three typical kinds of Rifampicin-loaded microspheres with different ratio of PLLA and PDLA (7:3, 3:7, 10:0, sorted by porosity from high to low) were prepared and the release behavior was compared. At 30 h, the cumulative release of 7:3, 3:7 and 10:0 microspheres were 32.6%, 17.8% and 6.0% respectively, indicating that the release profiles were generally determined by the porosity of the microspheres. Our findings not only provide a new strategy to prepare PLA microspheres with controllable morphology but offer additional possibilities for the applications of SC-PLA products in biomedical area.
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Affiliation(s)
- Bowen Yu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China
| | - Lu Meng
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China
| | - Sirui Fu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China
| | - Zhiyu Zhao
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China
| | - Yuhang Liu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China
| | - Ke Wang
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China
| | - Qiang Fu
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, 610065, China.
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3
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Wojtczak E, Gadzinowski M, Makowski T, Maresz K, Kubisa P, Bednarek M, Pluta M. Encapsulation of hydrophobic vitamins by polylactide stereocomplexation and their release study. POLYM INT 2018. [DOI: 10.1002/pi.5674] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Edyta Wojtczak
- Centre of Molecular and Macromolecular Studies; Polish Academy of Sciences; Lodz Poland
| | - Mariusz Gadzinowski
- Centre of Molecular and Macromolecular Studies; Polish Academy of Sciences; Lodz Poland
| | - Tomasz Makowski
- Centre of Molecular and Macromolecular Studies; Polish Academy of Sciences; Lodz Poland
| | - Katarzyna Maresz
- Institute of Chemical Engineering Polish Academy of Sciences; Gliwice Poland
| | - Przemysław Kubisa
- Centre of Molecular and Macromolecular Studies; Polish Academy of Sciences; Lodz Poland
| | - Melania Bednarek
- Centre of Molecular and Macromolecular Studies; Polish Academy of Sciences; Lodz Poland
| | - Mirosław Pluta
- Centre of Molecular and Macromolecular Studies; Polish Academy of Sciences; Lodz Poland
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4
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Wojtczak E, Biedroń T, Bednarek M. Hydrolytic stability of polylactide stereocomplex microparticles containing metal ions. Polym Bull (Berl) 2018. [DOI: 10.1007/s00289-018-2432-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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5
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Gardella L, Mincheva R, De Winter J, Tachibana Y, Raquez JM, Dubois P, Monticelli O. Synthesis, characterization and stereocomplexation of polyamide 11/polylactide diblock copolymers. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2017.11.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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6
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Fan X, Cao M, Zhang X, Li Z. Synthesis of star-like hybrid POSS-(PDMAEMA-b-PDLA)8 copolymer and its stereocomplex properties with PLLA. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 76:211-216. [DOI: 10.1016/j.msec.2017.03.108] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Revised: 03/09/2017] [Accepted: 03/13/2017] [Indexed: 01/27/2023]
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7
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Stereocomplex poly(lactic acid) nanocoated chitosan microparticles for the sustained release of hydrophilic drugs. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 76:1129-1135. [DOI: 10.1016/j.msec.2017.03.170] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 03/10/2017] [Accepted: 03/20/2017] [Indexed: 12/17/2022]
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8
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Li Z, Tan BH, Lin T, He C. Recent advances in stereocomplexation of enantiomeric PLA-based copolymers and applications. Prog Polym Sci 2016. [DOI: 10.1016/j.progpolymsci.2016.05.003] [Citation(s) in RCA: 190] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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9
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Bednarek M, Wojtczak E, Pluta M. Spontaneous formation of polylactide stereocomplex microspheres containing metal ions. POLYM INT 2016. [DOI: 10.1002/pi.5251] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Melania Bednarek
- Centre of Molecular and Macromolecular Studies; Polish Academy of Sciences; Sienkiewicza 112 90-362 Lodz Poland
| | - Edyta Wojtczak
- Centre of Molecular and Macromolecular Studies; Polish Academy of Sciences; Sienkiewicza 112 90-362 Lodz Poland
| | - Mirosław Pluta
- Centre of Molecular and Macromolecular Studies; Polish Academy of Sciences; Sienkiewicza 112 90-362 Lodz Poland
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10
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Li Z, Yuan D, Jin G, Tan BH, He C. Facile Layer-by-Layer Self-Assembly toward Enantiomeric Poly(lactide) Stereocomplex Coated Magnetite Nanocarrier for Highly Tunable Drug Deliveries. ACS APPLIED MATERIALS & INTERFACES 2016; 8:1842-53. [PMID: 26717323 DOI: 10.1021/acsami.5b09822] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
A highly tunable nanoparticle (NP) system with multifunctionalities was developed as drug nanocarrier via a facile layer-by-layer (LbL) stereocomplex (SC) self-assembly of enantiomeric poly(l-lactic acid) (PLLA) and poly(d-lactic acid) (PDLA) in solution using silica-coated magnetite (Fe3O4@SiO2) as template. The poly(lactide) (PLA) SC coated NPs (Fe3O4@SiO2@-SC) were further endowed with different stimuli-responsiveness by controlling the outermost layer coatings with respective pH-sensitive poly(lactic acid)-poly(2-dimethylaminoethyl methacrylate) (PLA-D) and temperature-sensitive poly(lactic acid)-poly(N-isopropylacrylamide) (PLA-N) diblock copolymers to yield Fe3O4@SiO2@SC-D and Fe3O4@SiO2@SC-N NPs, respectively, while the superparamagnetic properties of Fe3O4 were maintained. TEM images show a clearly resolved core-shell structure with a silica layer and sequential PLA SC co/polymer coating layers in the respective NPs. The well-designed NPs possess a size distribution in a range of 220-270 nm and high magnetization of 70.8-72.1 emu/g [Fe3O4]. More importantly, a drug release study from the as-constructed stimuli-responsive NPs exhibited sustained release profiles and the rates of release can be tuned by variation of external environments. Further cytotoxicity and cell culture studies revealed that PLA SC coated NPs possessed good cell biocompatibility and the doxorubicin (DOX)-loaded NPs showed enhanced drug delivery efficiency toward MCF-7 cancer cells. Together with the strong magnetic sensitivity, the developed hybrid NPs demonstrate a great potential of control over the drug release at a targeted site. The developed coating method can be further optimized to finely tune the nanocarrier size and operating range of pHs and temperatures for in vivo applications.
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Affiliation(s)
- Zibiao Li
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Singapore
| | - Du Yuan
- Department of Materials Science and Engineering, National University of Singapore , Singapore 117574, Singapore
| | - Guorui Jin
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Singapore
| | - Beng H Tan
- Department of Materials Science and Engineering, National University of Singapore , Singapore 117574, Singapore
| | - Chaobin He
- Department of Materials Science and Engineering, National University of Singapore , Singapore 117574, Singapore
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, Singapore 117602, Singapore
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11
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Brzeziński M, Biela T. Micro- and nanostructures of polylactide stereocomplexes and their biomedical applications. POLYM INT 2015. [DOI: 10.1002/pi.4961] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Marek Brzeziński
- Department of Polymer Chemistry Centre of Molecular and Macromolecular Studies; Polish Academy of Sciences; Sienkiewicza 112 90-363 Lodz Poland
| | - Tadeusz Biela
- Department of Polymer Chemistry Centre of Molecular and Macromolecular Studies; Polish Academy of Sciences; Sienkiewicza 112 90-363 Lodz Poland
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12
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Yang M, Yu T, Wood J, Wang YY, Tang BC, Zeng Q, Simons BW, Fu J, Chuang CM, Lai SK, Wu TC, Hung CF, Hanes J. Intraperitoneal delivery of paclitaxel by poly(ether-anhydride) microspheres effectively suppresses tumor growth in a murine metastatic ovarian cancer model. Drug Deliv Transl Res 2015; 4:203-9. [PMID: 24816829 DOI: 10.1007/s13346-013-0190-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Intraperitoneal (IP) chemotherapy is more effective than systemic chemotherapy for treating advanced ovarian cancer, but is typically associated with severe complications due to high dose, frequent administration schedule, and use of non-biocompatible excipients/delivery vehicles. Here, we developed paclitaxel (PTX)-loaded microspheres composed of di-block copolymers of poly(ethylene glycol) and poly(sebacic acid) (PEG-PSA) for safe and sustained IP chemotherapy. PEG-PSA microspheres provided efficient loading (~ 13% w/w) and prolonged release (~ 13 days) of PTX. In a murine ovarian cancer model, a single dose of IP PTX/PEG-PSA particles effectively suppressed tumor growth for more than 40 days and extended the median survival time to 75 days compared to treatments with Taxol(®) (47 days) or IP placebo particles (34 days). IP PTX/PEG-PSA was well tolerated, with only minimal to mild inflammation. Our findings support PTX/PEG-PSA microspheres as a promising drug delivery platform for IP therapy of ovarian cancer, and potentially other metastatic peritoneal cancers.
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Affiliation(s)
- Ming Yang
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, 720 Rutland Avenue, Baltimore, MD 21205 (USA) ; Center for Nanomedicine, Johns Hopkins University School of Medicine, 400 N Broadway, Baltimore, MD 21287 (USA)
| | - Tao Yu
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, 720 Rutland Avenue, Baltimore, MD 21205 (USA) ; Center for Nanomedicine, Johns Hopkins University School of Medicine, 400 N Broadway, Baltimore, MD 21287 (USA)
| | - Joseph Wood
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, 720 Rutland Avenue, Baltimore, MD 21205 (USA)
| | - Ying-Ying Wang
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, 720 Rutland Avenue, Baltimore, MD 21205 (USA) ; Center for Nanomedicine, Johns Hopkins University School of Medicine, 400 N Broadway, Baltimore, MD 21287 (USA)
| | - Benjamin C Tang
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, 3400 N Charles Street, Baltimore, MD 21218 (USA) ; Center for Nanomedicine, Johns Hopkins University School of Medicine, 400 N Broadway, Baltimore, MD 21287 (USA)
| | - Qi Zeng
- Department of Pathology, Johns Hopkins University School of Medicine, 600 N Wolfe Street, Baltimore, MD 21287 (USA)
| | - Brian W Simons
- Department of Molecular and Comparative Pathobiology, Johns Hopkins University School of Medicine, 1550 Orleans Street, Baltimore, MD, 21231 (USA)
| | - Jie Fu
- Department of Ophthalmology, The Wilmer Eye Institute, Johns Hopkins University School of Medicine, 400 N Broadway, Baltimore, MD 21287 (USA) ; Center for Nanomedicine, Johns Hopkins University School of Medicine, 400 N Broadway, Baltimore, MD 21287 (USA)
| | - Chi-Mu Chuang
- Department of Pathology, Johns Hopkins University School of Medicine, 600 N Wolfe Street, Baltimore, MD 21287 (USA)
| | - Samuel K Lai
- Department of Chemical and Biomolecular Engineering, Johns Hopkins University, 3400 N Charles Street, Baltimore, MD 21218 (USA)
| | - T-C Wu
- Department of Pathology, Johns Hopkins University School of Medicine, 600 N Wolfe Street, Baltimore, MD 21287 (USA) ; Department of Obstetrics and Gynecology, Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD 21287 (USA) ; Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD 21287 (USA)
| | - Chien-Fu Hung
- Department of Pathology, Johns Hopkins University School of Medicine, 600 N Wolfe Street, Baltimore, MD 21287 (USA) ; Department of Obstetrics and Gynecology, Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD 21287 (USA) ; Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD 21287 (USA)
| | - Justin Hanes
- Department of Biomedical Engineering, Johns Hopkins University School of Medicine, 720 Rutland Avenue, Baltimore, MD 21205 (USA) ; Department of Chemical and Biomolecular Engineering, Johns Hopkins University, 3400 N Charles Street, Baltimore, MD 21218 (USA) ; Department of Ophthalmology, The Wilmer Eye Institute, Johns Hopkins University School of Medicine, 400 N Broadway, Baltimore, MD 21287 (USA) ; Department of Oncology, Sidney Kimmel Comprehensive Cancer Center, Johns Hopkins University School of Medicine, 600 N. Wolfe Street, Baltimore, MD 21287 (USA) ; Center for Cancer Nanotechnology Excellence, Institute for NanoBioTechnology, Johns Hopkins University, 3400 N Charles Street, Baltimore, MD 21218 (USA) ; Center for Nanomedicine, Johns Hopkins University School of Medicine, 400 N Broadway, Baltimore, MD 21287 (USA)
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13
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Kobayashi K, Kanmuri S, Kimura Y, Masutani K. Synthesis and properties of stereo mixtures of enantiomeric block copolymers of polylactide and aliphatic polycarbonate. POLYM INT 2014. [DOI: 10.1002/pi.4839] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Koji Kobayashi
- Department of Biobased Materials Science; Kyoto Institute of Technology; Matsugasaki Kyoto 606-8585 Japan
| | - Shuhei Kanmuri
- Department of Biobased Materials Science; Kyoto Institute of Technology; Matsugasaki Kyoto 606-8585 Japan
| | - Yoshiharu Kimura
- Department of Biobased Materials Science; Kyoto Institute of Technology; Matsugasaki Kyoto 606-8585 Japan
| | - Kazunari Masutani
- Department of Biobased Materials Science; Kyoto Institute of Technology; Matsugasaki Kyoto 606-8585 Japan
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14
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Arias V, Odelius K, Albertsson AC. Nano-stereocomplexation of polylactide (PLA) spheres by spray droplet atomization. Macromol Rapid Commun 2014; 35:1949-53. [PMID: 25262929 PMCID: PMC4283727 DOI: 10.1002/marc.201400374] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Revised: 08/04/2014] [Indexed: 11/30/2022]
Abstract
A direct, efficient, and scalable method to prepare stereocomplexed polylactide (PLA)-based nanoparticles (NPs) is achieved. By an appropriate combination of fabrication parameters, NPs with controlled shape and crystalline morphology are obtained and even pure PLA stereocomplexes (PLASC) are successfully prepared using the spray-drying technology. The formed particles of varying D- and L-LA content have an average size of ≈400 nm, where the smallest size is obtained for PLA50, which has an equimolar composition of PLLA and PDLA in solution. Raman spectra of the particles show the typical shifts for PLASC in PLA50, and thermal analysis indicates the presence of pure stereocomplexation, with only one melting peak at 226 °C. Topographic images of the particles exhibit a single phase with different surface roughness in correlation with the thermal analysis. A high yield of spherically shaped particles is obtained. The results clearly provide a proficient method for achieving PLASC NPs that are expected to function as renewable materials in PLA-based nanocomposites and potentially as more stable drug delivery carriers.
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Affiliation(s)
- Veluska Arias
- Department of Fibre and Polymer Technology, KTH Royal Institute of TechnologySE-100 44, Stockholm, Sweden
| | - Karin Odelius
- Department of Fibre and Polymer Technology, KTH Royal Institute of TechnologySE-100 44, Stockholm, Sweden
| | - Ann-Christine Albertsson
- Department of Fibre and Polymer Technology, KTH Royal Institute of TechnologySE-100 44, Stockholm, Sweden
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Soleymani Abyaneh H, Vakili MR, Lavasanifar A. The Effect of Polymerization Method in Stereo-active Block Copolymers on the Stability of Polymeric Micelles and their Drug Release Profile. Pharm Res 2014; 31:1485-500. [DOI: 10.1007/s11095-013-1255-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 12/05/2013] [Indexed: 01/15/2023]
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16
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Properties of poly(lactic acid) and poly(ethylene oxide) solvent polymer mixtures and nanofibers made by solution blow spinning. J Appl Polym Sci 2013. [DOI: 10.1002/app.39061] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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17
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Tsai PF, Hung WC, Chang JK, Shau MD. A new cationic poly(ester-anhydride): Synthesis, structure characterization, and biological properties. POLYMER SCIENCE SERIES B 2012. [DOI: 10.1134/s1560090412080040] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Sasaki C, Okumura R, Asakawa A, Asada C, Nakamura Y. Production of D-lactic acid from sugarcane bagasse using steam-explosion. ACTA ACUST UNITED AC 2012. [DOI: 10.1088/1742-6596/352/1/012054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Salgado CL, Sanchez EMS, Zavaglia CAC, Granja PL. Biocompatibility and biodegradation of polycaprolactone-sebacic acid blended gels. J Biomed Mater Res A 2011; 100:243-51. [DOI: 10.1002/jbm.a.33272] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2011] [Revised: 08/05/2011] [Accepted: 09/12/2011] [Indexed: 11/07/2022]
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21
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Inkinen S, Hakkarainen M, Albertsson AC, Södergård A. From Lactic Acid to Poly(lactic acid) (PLA): Characterization and Analysis of PLA and Its Precursors. Biomacromolecules 2011; 12:523-32. [DOI: 10.1021/bm101302t] [Citation(s) in RCA: 495] [Impact Index Per Article: 38.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Saara Inkinen
- Laboratory of Polymer Technology, Center for Functional Materials (FUNMAT), Åbo Akademi University, Piispankatu 8, 20100 Turku, Finland
| | - Minna Hakkarainen
- The Royal Institute of Technology (KTH), Department of Fibre and Polymer Technology, Teknikringen 56-58, 10044 Stockholm, Sweden
| | - Ann-Christine Albertsson
- The Royal Institute of Technology (KTH), Department of Fibre and Polymer Technology, Teknikringen 56-58, 10044 Stockholm, Sweden
| | - Anders Södergård
- Laboratory of Polymer Technology, Center for Functional Materials (FUNMAT), Åbo Akademi University, Piispankatu 8, 20100 Turku, Finland
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Liang Y, Xiao L, Li Y, Zhai Y, Xie C, Deng L, Dong A. Poly(ester anhydride)/mPEG amphiphilic block co-polymer nanoparticles as delivery devices for paclitaxel. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2010; 22:701-15. [PMID: 20566053 DOI: 10.1163/092050610x490158] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
This work focused on the preparation and characterization of a novel amphiphilic block co-polymer and paclitaxel-loaded co-polymer nanoparticles (NPs) and in vitro evaluation of the release of paclitaxel and cytotoxicity of NPs. mPEG-b-P(OA-DLLA)-b-mPEG was prepared via melt polycondensation of methoxy poly(ethylene glycol) (mPEG), octadecanedioic acid (OA) and D,L-lactic acid (DLLA) and characterized by FT-IR, (1)H-NMR, (13)C-NMR, GPC, DSC and XRD. The paclitaxel-loaded mPEG-b-P(OA-DLLA)-b-mPEG NPs were prepared by nanoprecipitation and then characterized by LPSA, TEM and (1)H-NMR. In vitro release behaviors of the paclitaxel-loaded NPs were investigated by HPLC. In vitro cytotoxicity of NPs was evaluated by MTT assay with normal mouse lung fibroblast cells (L929) as model cells. The composition of mPEG-b-P(OA-DLLA)-b-mPEG is consistent with that of the designed co-polymer. The paclitaxel-loaded NPs are of spherical shape with core/shell structure and size smaller than 300 nm. Paclitaxel can be continuously released from the paclitaxel-loaded NPs and the in vitro release rate of paclitaxel decreases with increasing the content of the P(OA-DLLA) segments in the co-polymer. The mPEG-b-P(OA-DLLA)-b-mPEG NPs are non-toxic to L929. The results suggest that mPEG-b-P(OA-DLLA)-b-mPEG NPs are a potential candidate carrier material for the controlled delivery of paclitaxel and other hydrophobic compounds.
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Affiliation(s)
- Yanqin Liang
- School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
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23
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Inkinen S, Stolt M, Södergård A. Readily Controllable Step-Growth Polymerization Method for Poly(lactic acid) Copolymers Having a High Glass Transition Temperature. Biomacromolecules 2010; 11:1196-201. [DOI: 10.1021/bm901338n] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Saara Inkinen
- Tate and Lyle Finland Oy, Tykistökatu 4 D, FIN-20520 Turku, Finland
| | - Mikael Stolt
- Tate and Lyle Finland Oy, Tykistökatu 4 D, FIN-20520 Turku, Finland
| | - Anders Södergård
- Tate and Lyle Finland Oy, Tykistökatu 4 D, FIN-20520 Turku, Finland
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24
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Wanamaker CL, Bluemle MJ, Pitet LM, O'Leary LE, Tolman WB, Hillmyer MA. Consequences of polylactide stereochemistry on the properties of polylactide-polymenthide-polylactide thermoplastic elastomers. Biomacromolecules 2010; 10:2904-11. [PMID: 19775147 DOI: 10.1021/bm900721p] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A series of polylactide-polymenthide-polylactide triblock copolymers containing either amorphous poly(D,L-lactide) or semicrystalline, enantiopure poly(L-lactide) or poly(D-lactide) end segments were synthesized. Small-angle X-ray scattering and differential scanning calorimetry data were consistent with microphase separation of these materials. The Young's moduli and ultimate tensile strengths of the semicrystalline triblock copolymers were 2- and 3-fold greater, respectively, than their amorphous analogs. Symmetric (50:50) and asymmetric (95:5) blends of the triblock copolymers containing two different enantomeric forms of the polylactide segments formed stereocomplex crystallites, as revealed by wide-angle X-ray scattering and differential scanning calorimetry. Compared to the enantiopure analogs, these blends exhibited similar ultimate elongations and tensile strengths, but significantly increased Young's moduli. Collectively, these results demonstrate that the properties of these new biorenewable thermoplastic elastomers can be systematically modulated by changing the stereochemistry of the polylactide end blocks.
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Affiliation(s)
- Carolyn L Wanamaker
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, USA
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25
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Wanamaker CL, Tolman WB, Hillmyer MA. Hydrolytic Degradation Behavior of a Renewable Thermoplastic Elastomer. Biomacromolecules 2009; 10:443-8. [DOI: 10.1021/bm801292v] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Carolyn L. Wanamaker
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431
| | - William B. Tolman
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431
| | - Marc A. Hillmyer
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455-0431
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Nagahama K, Fujiura K, Enami S, Ouchi T, Ohya Y. Irreversible temperature-responsive formation of high-strength hydrogel from an enantiomeric mixture of starburst triblock copolymers consisting of 8-arm PEG and PLLA or PDLA. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22943] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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27
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Jain JP, Chitkara D, Kumar N. Polyanhydrides as localized drug delivery carrier: an update. Expert Opin Drug Deliv 2008; 5:889-907. [DOI: 10.1517/17425247.5.8.889] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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28
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Nagahama K, Mori Y, Ohya Y, Ouchi T. Biodegradable nanogel formation of polylactide-grafted dextran copolymer in dilute aqueous solution and enhancement of its stability by stereocomplexation. Biomacromolecules 2007; 8:2135-41. [PMID: 17559263 DOI: 10.1021/bm070206t] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Monodisperse stereocomplex nanogels were obtained through the self-assembly of an equimolar mixture of dextran-graft-poly(L-lactide) (Dex-g-PLLA) and dextran-graft-poly(D-lactide) (Dex-g-PDLA) amphiphilic copolymers with well-defined composition in a dilute aqueous solution. The stereocomplex nanogel possessed partially crystallized cores of hydrophobic polylactide (PLA) and the hydrophilic dextran skeleton by intra- and/or intermolecular self-assembly between PLLA and PDLA chains. The stereocomplex nanogels exhibited significantly lower critical aggregation concentration (CAC) value as well as stronger thermodynamic stability compared with those of the corresponding L- or D-isomer nanogels. The mean diameter of the stereocomplex nanogels was 70 nm with narrow size distribution, implying they were well-defined and presumably nanogels. Furthermore, stereocomplex nanogel exhibited strong kinetic stability. The tunable degradation properties of Dex-g-PLA nanogels were achieved by varying the number of grafted PLA chains as well as applying stereocomplexation. This study demonstrates the advantage of stereocomplexation in the design of biodegradable nanogels with enhanced stability.
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Affiliation(s)
- Koji Nagahama
- Department of Applied Chemistry, Faculty of Engineering and High Technology Research Center, Kansai University, Suita, Osaka, Japan
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29
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Faÿ F, Linossier I, Langlois V, Vallée-Rehel K. Biodegradable Poly(ester-anhydride) for New Antifouling Coating. Biomacromolecules 2007; 8:1751-8. [PMID: 17425364 DOI: 10.1021/bm061013t] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fabienne Faÿ
- Laboratoire de Biotechnologie et Chimie Marines, EA 3884, Université de Bretagne-Sud, BP 92116, 56321 Lorient Cedex, France.
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30
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Nagahama K, Nishimura Y, Ohya Y, Ouchi T. Impacts of stereoregularity and stereocomplex formation on physicochemical, protein adsorption and cell adhesion behaviors of star-shaped 8-arms poly(ethylene glycol)–poly(lactide) block copolymer films. POLYMER 2007. [DOI: 10.1016/j.polymer.2007.03.017] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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31
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Miao H, Fan Y, Liu Y, Liu Y, Hao J, Deng X. Biodegradable poly(sebacic anhydride-co-caprolactone) multi-block copolymers: Synthesis, characterization, crystallinity and crystalline morphology. Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2006.12.013] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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32
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Synthesis, crystallinity and degradation properties of biodegradable poly[(sebacic anhydride)-co-caprolactone] triblock copolymers. POLYM INT 2007. [DOI: 10.1002/pi.2349] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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33
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Korhonen H, Hakala RA, Helminen AO, Seppälä JV. Synthesis and Hydrolysis Behaviour of Poly(ester anhydrides) from Polylactone Precursors Containing Alkenyl Moieties. Macromol Biosci 2006; 6:496-505. [PMID: 16921537 DOI: 10.1002/mabi.200600060] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Hydroxyl-group functional polylactones were prepared and converted to acid- terminated polyesters in a reaction with a series of alkenylsuccinic anhydrides containing 8, 12, or 18 carbons in their alkenyl chains. These polyester precursors were then linked into higher molecular weight poly(ester anhydrides) containing alkenyl moieties in their polyester blocks. The hydrolysis behaviour of the poly(ester anhydrides) was found to depend on the thermal properties of the polyester precursors. For poly(ester anhydrides) prepared from low molecular weight prepolymers with thermal transitions below 37 degrees C, the presence of hydrophobic alkenyl chains in the polyester precursors slowed the rate of weight loss. Poly(ester anhydrides) prepared from higher molecular weight prepolymers showed the opposite weight-loss behaviour; i.e., the crystallinity and thermal transitions of the alkenyl chain-containing poly(ester anhydrides) were low, and the weight loss was faster than for poly(ester anhydrides) without the alkenyl chains. The differences in length of the alkenyl chain, as such, had little effect on the hydrolysis behaviour and thermal properties of the poly(ester anhydrides).
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Affiliation(s)
- Harri Korhonen
- Helsinki University of Technology, Department of Chemical Technology, Laboratory of Polymer Technology, P.O. Box 6100, FIN-02015 HUT, Finland
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34
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Fukushima K, Kimura Y. Stereocomplexed polylactides (Neo-PLA) as high-performance bio-based polymers: their formation, properties, and application. POLYM INT 2006. [DOI: 10.1002/pi.2010] [Citation(s) in RCA: 365] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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35
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Hu J, Tang Z, Qiu X, Han Y, Du Q, Chen X, Jing X. Effects of Stereoregularity of Multiblock Copoly(rac-lactide)s on Stereocomplex Microparticles and Their Insulin Delivery. Macromol Biosci 2005; 5:1193-9. [PMID: 16308890 DOI: 10.1002/mabi.200500157] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Uniform stereo-complex microparticles ranging from nanometer to micrometer size are prepared by using stereo multiblock co-poly(rac-lactide)s (smb-PLAs) with different stereo-regularity. At comparable molecular weights, as the smb-PLA stereo-regularity decreases from 88% to 76%, the crystallinity of the microparticles decreases noticeably, as proved by DSC and WAXD. At the same time, the shape of the microparticles varies from the flower shape to the sphere shape and the particle size increases markedly from 700-2700 nm as shown by SEM. However, all insulin-loaded microparticles are of cake-shape and their sizes depend on the stereo-regularity. The crystallization of smb-PLAs facilitated by insulin is evidenced by the increase of T(m) and DeltaH(f) in DSC. The highest insulin-loading content of 14.2% and -entrapment efficiency of 82.8% are obtained from the smb-PLA with the highest stereo-regularity of 88%. Release studies in vitro show the least first-day release at about 25% followed by continuous release of another 70% of insulin over one month. Stereo-complex microparticles of smb-PLAs with lower stereo-regularity resulted in a relatively lower insulin-entrapment efficiency and -loading content, a larger first-day release, and also complete release of 90% of the total amount within one month. The release system follows a diffusion mechanism. By contrast, atactic PLA shows a very low entrapment efficiency of 16.7%. Structure of a stereo multiblock co-poly(rac-lactide).
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Affiliation(s)
- Junli Hu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
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Pfeifer BA, Burdick JA, Little SR, Langer R. Poly(ester-anhydride):poly(beta-amino ester) micro- and nanospheres: DNA encapsulation and cellular transfection. Int J Pharm 2005; 304:210-9. [PMID: 16174553 DOI: 10.1016/j.ijpharm.2005.08.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2005] [Revised: 08/02/2005] [Accepted: 08/02/2005] [Indexed: 11/19/2022]
Abstract
Poly(ester-anhydride) delivery devices allow flexibility regarding carrier dimensions (micro- versus nanospheres), degradation rate (anhydride versus ester hydrolysis), and surface labeling (through the anhydride functional unit), and were therefore tested for DNA encapsulation and transfection of a macrophage P388D1 cell line. Poly(l-lactic acid-co-sebacic anhydride) and poly(l-lactic acid-co-adipic anhydride) were synthesized through melt condensation, mixed with 25 wt.% poly(beta-amino ester), and formulated with plasmid DNA (encoding firefly luciferase) into micro- and nanospheres using a double emulsion/solvent evaporation technique. The micro- and nanospheres were then characterized (size, morphology, zeta potential, DNA release) and assayed for DNA encapsulation and cellular transfection over a range of poly(ester-anhydride) copolymer ratios. Poly(ester-anhydride):poly(beta-amino ester) composite microspheres (6-12 microm) and nanospheres (449-1031 nm), generated with copolymers containing between 0 and 25% total polyanhydride content, encapsulated plasmid DNA (>or=20% encapsulation efficiency). Within this polyanhydride range, poly(adipic anhydride) copolymers provided DNA encapsulation at an increased anhydride content (10%, microspheres; 10-25%, nanospheres) compared to poly(sebacic anhydride) copolymers (1%, microspheres and nanospheres) with cellular transfection correlating with the observed DNA encapsulation.
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Affiliation(s)
- Blaine A Pfeifer
- Department of Chemical and Biological Engineering, Tufts University, Medford, MA 02155, USA.
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37
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Copolymerization of trimethylene carbonate and 2,2-dimethyltrimethylene carbonate by rare earth calixarene complexes. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.07.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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38
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Modi S, Jain JP, Kumar N. Synthesis, characterization, and degradation of poly(ester-anhydride) for particulate delivery. Isr J Chem 2005. [DOI: 10.1560/0m15-cnaq-bdr7-xfcm] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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39
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Hu J, Tang Z, Qiu X, Pang X, Yang Y, Chen X, Jing X. Formation of Flower- or Cake-Shaped Stereocomplex Particles from the Stereo Multiblock Copoly(rac-lactide)s. Biomacromolecules 2005; 6:2843-50. [PMID: 16153126 DOI: 10.1021/bm050340i] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Flower- or cake-shaped particles with uniform particle size ranging from nanometers to micrometers were prepared from the stereo multiblock copoly(rac-lactide)s (smb-PLAs) by precipitating the polymer from its solution in methylene chloride/ethanol via three different methods: slowly lowering the solution temperature, slowly evaporating the solvent, and slowly adding a nonsolvent. Under the same condition, sheet-shaped crystals in 10 mum size but not particles were obtained from the pure PLLA with almost the same molecular weight. Electron diffraction and WAXD data demonstrated that the stereocomplex particles belonged to the monoclinic system. All three methods resulted in particles with identical morphology and almost the same particle size. At a given stereoregularity of 88%, as the molecular weight of the polymer increased from 8700 to 23,200 Da, the crystallinity decreased, the particle morphology changed from flower-shaped to cake-shaped, and the diameter and height of the particles increased from 0.8 and 0.45 to 3.6 microm and 2.0 microm, respectively. The initial concentration of the polymer solution influenced the particle size slightly but affected the morphology markedly. On the basis of the above experimental observations, it was proposed that the smb-PLA particles of flower- or cake-shape were formed in four steps: (1) complexation in solution of the smb-PLA chains; (2) particle nucleation; (3) particle growth in the width direction; and (4) particle growth in the height direction. The curvature of the paired smb-PLA chains and the inner stress governed the particle size, and the interconnection between the neighboring particles determined the layered structure and the package density of the particles formed.
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Affiliation(s)
- Junli Hu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
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40
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Tsuji H. Poly(lactide) Stereocomplexes: Formation, Structure, Properties, Degradation, and Applications. Macromol Biosci 2005; 5:569-97. [PMID: 15997437 DOI: 10.1002/mabi.200500062] [Citation(s) in RCA: 875] [Impact Index Per Article: 46.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Poly(lactide)s [i.e. poly(lactic acid) (PLA)] and lactide copolymers are biodegradable, compostable, producible from renewable resources, and nontoxic to the human body and the environment. They have been used as biomedical materials for tissue regeneration, matrices for drug delivery systems, and alternatives for commercial polymeric materials to reduce the impact on the environment. Since stereocomplexation or stereocomplex formation between enantiomeric PLA, poly(L-lactide) [i.e. poly(L-lactic acid) (PLLA)] and poly(D-lactide) [i.e. poly(D-lactic acid) (PDLA)] was reported in 1987, numerous studies have been carried out with respect to the formation, structure, properties, degradation, and applications of the PLA stereocomplexes. Stereocomplexation enhances the mechanical properties, the thermal-resistance, and the hydrolysis-resistance of PLA-based materials. These improvements arise from a peculiarly strong interaction between L-lactyl unit sequences and D-lactyl unit sequences, and stereocomplexation opens a new way for the preparation of biomaterials such as hydrogels and particles for drug delivery systems. It was revealed that the crucial parameters affecting stereocomplexation are the mixing ratio and the molecular weight of L-lactyl and D-lactyl unit sequences. On the other hand, PDLA was found to form a stereocomplex with L-configured polypeptides in 2001. This kind of stereocomplexation is called "hetero-stereocomplexation" and differentiated from "homo-stereocomplexation" between L-lactyl and D-lactyl unit sequences. This paper reviews the methods for tracing PLA stereocomplexation, the methods for inducing PLA stereocompelxation, the parameters affecting PLA stereocomplexation, and the structure, properties, degradation, and applications of a variety of stereocomplexed PLA materials.
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Affiliation(s)
- Hideto Tsuji
- Department of Ecological Engineering, Faculty of Engineering, Toyohashi University of Technology, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan.
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41
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Jia L, Yin L, Li Y, Li Q, Yang J, Yu J, Shi Z, Fang Q, Cao A. New Enantiomeric Polylactide-block-Poly(butylene succinate)-block-Polylactides: Syntheses, Characterization and in situ Self-Assembly. Macromol Biosci 2005; 5:526-38. [PMID: 15948230 DOI: 10.1002/mabi.200400227] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In situ self-assemblies of new biodegradable triblock PLLA-b-PBS-b-PLLA and PDLA-b-PBS-b-PDLA have been investigated in acetonitrile solution. At first, two series of PLLA-b-PBS-b-PLLA and PDLA-b-PBS-b-PDLA, respectively denoted as the P and Q triblock copolyester series, were prepared with fixed PBS block ((overline) M(n,NMR) = 6.9 kDa) and diverse enantiomeric PLLA/PDLA blocks. Further, their chemical structures and thermal properties were characterized by means of titration, nuclear magnetic resonance spectroscopy (NMR), gel permeation chromatography (GPC), polarimeter, wide-angle X-ray diffraction (WAXD) and thermal analytical instruments. When mixing the synthesized enantiomeric copolyester pairs denoted as P(1)/Q(1) - P(8)/Q(8) in acetonitrile solution at 60 degrees C, in situ self-assemblies were found to happen for the P(4)/Q(4) to P(8)/Q(8) pairs, bearing longer enantiomeric PLA block lengths. DSC and WAXD analysis of the self-assembled microparticles demonstrated that PLLA/PDLA racemic crystals were formed for the P(5)/Q(5) - P(8)/Q(8) systems, as evidenced by their melting points over 200 degrees C, and a new X-ray diffraction peak detected at 2theta = 11.8 degrees . Moreover, morphological studies by scanning electron microscopy (SEM) indicated the formation of disk- or platelet-like microparticles. It was noted that the diameters of the microparticles self-assembled in situ decreased from 1.28-1.50 mum down to 480-660 nm, through tailoring the enantiomeric PLA block length. Other factors, such as a central PBS block, the enantiomeric block length and the preparation conditions were suggested to play important roles in the in situ self-assembly of these enantiomeric triblock copolyesters. These results provide a facile way to self-assemble hydrophobic, biodegradable microparticles, through tuning the important van der Waals stereocomplexation interactions between two enantiomeric blocks in solution.
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Affiliation(s)
- Lin Jia
- Department of Chemistry, Northwest University, 229 North Taibai Road, Xi'an, Shanxi 710069, China
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42
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Wang CH, Fan KR, Hsiue GH. Enzymatic degradation of PLLA-PEOz-PLLA triblock copolymers. Biomaterials 2005; 26:2803-11. [PMID: 15603776 DOI: 10.1016/j.biomaterials.2004.07.064] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2004] [Accepted: 07/30/2004] [Indexed: 11/26/2022]
Abstract
The enzymatic degradation of poly(L-lactide)-block- poly(2-ethyl-2-oxazoline)-block-poly(L-lactide) triblock copolymer (PLLA-PEOz-PLLA) was investigated using efficient enzyme proteinase K. PLLA-PEOz-PLLA solution-cast film lost a considerable amount of hydrophilic copolymers in the first 2 h, and the degradation after 2 h proceeded predominantly by surface erosion. The two faces of the hydrolyzed film exhibited different morphologies following enzymatic degradation. The lower face showed many spherulites, which are the superstructural morphology of polymer crystals. Porous spheres based on crystalline PLLA were observed on the upper face, because they were more resistant to enzymatic attack. The crystallinity of the films increased monotonously with the hydrolysis time, thus, the absorption of water gradually decreased. The analysis of degradation residues revealed that many colloids of poly(2-ethyl-2-oxazoline)-co-polyethylenimine (PEOz-co-PEI) copolymers were dispersed in the buffer solution. The average diameter, 1 microm, of the colloids was reduced to 200 nm by advanced degradation. The proteinase K exhibited remarkable hydrolysis not only at the ester bond but also the amide bond.
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Affiliation(s)
- Chau-Hui Wang
- Department of Chemical Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
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43
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Bos GW, Hennink WE, Brouwer LA, den Otter W, Veldhuis TFJ, van Nostrum CF, van Luyn MJA. Tissue reactions of in situ formed dextran hydrogels crosslinked by stereocomplex formation after subcutaneous implantation in rats. Biomaterials 2005; 26:3901-9. [PMID: 15626437 DOI: 10.1016/j.biomaterials.2004.10.008] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2004] [Accepted: 10/18/2004] [Indexed: 11/27/2022]
Abstract
In this study, the in vivo biocompatibility of physically crosslinked dextran hydrogels was investigated. These hydrogels were obtained by mixing aqueous solutions of dextran grafted with L-lactic acid oligomers and dextran grafted with D-lactic acid oligomers. Gelation occurs due to stereocomplex formation of the lactic acid oligomers of opposite chirality. Since gelation takes some time, in situ gel formation is possible with this system. A number of sterilization methods was evaluated for their effect on the chemical and physical properties of the hydrogel. It was shown that of the investigated options (filtration, gamma irradiation, dry-heat and autoclaving) dry-heat sterilization was the preferred method to prepare sterile gels suitable for in vivo evaluations. Two types of stereocomplex gels were prepared and implanted subcutaneously in rats. The tissue reaction was evaluated over a period of 30 days. A mild ongoing foreign body reaction was observed characterized by infiltration of macrophages. Giant cells were only scarcely formed and the low numbers of lymphocytes showed that priming of the immune system is hardly involved. Importantly, the gels fully degraded in vivo within 15 days, which is in good agreement with the in vitro degradation behaviour of these gels. In conclusion, stereocomplexed dextran-oligolactic gels showed good biocompatibility which makes them suitable candidates for the design of controlled release devices for pharmaceutically active proteins.
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Affiliation(s)
- Gert W Bos
- Department of Pharmaceutics, Utrecht Institute for Pharmaceutical Sciences (UIPS), Utrecht University, P.O. Box 80 082, 3508 TB Utrecht, The Netherlands
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44
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Jain JP, Modi S, Domb AJ, Kumar N. Role of polyanhydrides as localized drug carriers. J Control Release 2005; 103:541-63. [PMID: 15820403 DOI: 10.1016/j.jconrel.2004.12.021] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2004] [Accepted: 12/13/2004] [Indexed: 10/25/2022]
Abstract
Many drugs that are administered in an unmodified form by conventional systemic routes fail to reach target organs in an effective concentration, or are not effective over a length of time due to a facile metabolism. Various types of targeting delivery systems and devices have been tried over a long period of time to overcome these problems. Targeted delivery or localized drug delivery offers an advantage of reduced body burden and systemic toxicity of the drugs, especially useful for highly toxic drugs like anticancer agents. Local drug delivery via polymer is a simple approach and hypothesized to avoid the above stated problems. Polyanhydrides are a unique class of polymer for drug delivery because some of them demonstrate a near zero order drug release and relatively rapid biodegradation in vivo. Further, the release rate of polyanhydride fabricated device can be altered over a thousand fold by simple changes in the polymer backbone. Hence, these are one of the best-suited polymers for drug delivery, with biodegradability and biocompatibility. The review focuses on the advantages of polyanhydride carriers in localized drug delivery along with their degradability behavior, toxicological profile and role in various disease conditions.
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Affiliation(s)
- Jay Prakash Jain
- Department of Pharmaceutics, National Institute of Pharmaceutical Education and Research, Sec. 67, SAS Nagar (Mohalali) Punjab-160062, India
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45
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Pfeifer BA, Burdick JA, Langer R. Formulation and surface modification of poly(ester-anhydride) micro- and nanospheres. Biomaterials 2005; 26:117-24. [PMID: 15207458 DOI: 10.1016/j.biomaterials.2004.02.015] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2003] [Accepted: 02/03/2004] [Indexed: 11/24/2022]
Abstract
This report presents the formulation and surface modification of poly(ester-anhydride) copolymers. Two synthetic schemes were used to generate a variety of copolymers with varying compositions and molecular weights. These polymers were formulated into both micro- and nanospheres using a water-in-oil-in-water double emulsion technique. Microspheres were between 3 and 10 microm in diameter; whereas, nanospheres were between 300 and 500 nm. Finally, both micro- and nanospheres were surface modified using cystamine and quantified, following cystamine reduction, with DTNB (Ellman's reagent). Surface labeling was observed at 0.20-35 micromol/g for microspheres and 0.6-100 micromol/g for nanospheres and followed the expected trend of increased labeling with increased polyanhydride content.
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Affiliation(s)
- Blaine A Pfeifer
- Division of Biological Engineering, Department of Chemical Engineering, Massachusetts Institute of Technology, 45 Carleton Street, E25-342, Cambridge, MA 02142, USA
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46
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Tang Z, Chen X, Yang Y, Pang X, Sun J, Zhang X, Jing X. Stereoselective polymerization ofrac-lactide with a bulky aluminum/Schiff base complex. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/pola.20429] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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47
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Slager J, Domb AJ. Hetero-stereocomplexes of d-poly(lactic acid) and the LHRH analogue leuprolide. Application in controlled release. Eur J Pharm Biopharm 2004; 58:461-9. [PMID: 15451519 DOI: 10.1016/j.ejpb.2004.04.017] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2003] [Revised: 04/28/2004] [Accepted: 04/28/2004] [Indexed: 11/22/2022]
Abstract
Reversible hetero-stereoselective complexes were obtained by mixing acetonitrile solutions of enantiomeric D-poly(lactic acid) (d-PLA) and leuprolide, an L-configured nonapeptide LHRH analogue. The complex spontaneously aggregated and precipitated in high yields (95%) from acetonitrile solutions, forming uniform, porous microparticles with a mean unweighed particle size of 1.7 microm. The complexation of L-configured peptide occurred only with D-PLA, and not with L-PLA or racemic D,L-PLA. Various factors affecting the release pattern of leuprolide from the hetero-stereocomplexes were investigated. Complexes with D-PLA of low molecular weight (< 10,000 Da) displayed lower release rates of leuprolide than high molecular weight D-PLA (> 50,000 Da). Changing the leuprolide: D-PLA ratio from 1:50 to 1:10 (w/w) in the stereocomplex, resulted in a faster release of leuprolide. Similarly, the release rate of leuprolide was twice as fast when adding poly(ethylene glycol) to the acetonitrile complexation solution. Leuprolide was released from most of the formulations in a first order pattern, with only a small burst release during the first 24 h. Addition of water to the complexation solution significantly increased the initial release of the peptide. Low testosterone levels for over 25 days were observed in an in vivo release study of leuprolide from a hetero-stereocomplex formulation, monitoring testosterone levels in the blood of rats after sub cutaneous injection.
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Affiliation(s)
- Joram Slager
- Department of Medicinal Chemistry and Natural Products, Faculty of Medicine, School of Pharmacy, Hebrew University of Jerusalem, Jerusalem, Israel
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Tang Z, Chen X, Pang X, Yang Y, Zhang X, Jing X. Stereoselective Polymerization of rac-Lactide Using a Monoethylaluminum Schiff Base Complex. Biomacromolecules 2004; 5:965-70. [PMID: 15132688 DOI: 10.1021/bm034467o] [Citation(s) in RCA: 176] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A monoethylaluminum Schiff base complex (2) with formula LAlEt (L = N,N'-(2,2-dimethylpropylene)bis(3,5-di-tert-butylsalicylideneimine) was synthesized and employed for the stereoselective ring-opening polymerization of rac-lactide (rac-LA). The complex 2 was characterized by nuclear magnetic resonance, crystal structure, and elemental analysis. It contains a five-coordinate aluminum atom with distorted trigonal bipyramidal geometry in the solid state. In the presence of 2-propanol, 2 showed high stereoselectivity for the polymerization of rac-LA. The polymerization yielded crystalline poly(rac-LA) with a high melting temperature (193-201 degrees C). NMR, differential scanning calorimetry, and wide-angle X-ray diffraction indicated that the poly(rac-LA) was highly isotactic, and a stereocomplex was formed between poly-l- and poly-d-lactide block sequences. By the analysis of electrospray-ionization mass spectrometry and (1)H NMR, the polymer was demonstrated to be endcapped in both terminals with an isopropyl ester and a hydroxy group, respectively. The polymerization was of first order in rac-LA concentration. The relationship between the rac-LA conversion and molecular weights of the polymer was linear so that the polymerization could be well controlled.
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Affiliation(s)
- Zhaohui Tang
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China
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SURFACE-ERODIBLE BIOMATERIALS FOR DRUG DELIVERY. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/s0065-2377(03)29006-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Crosslinked poly(ester anhydride)s based on poly(ε-caprolactone) and polylactide oligomers. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/pola.10951] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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