151
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Zhou Z, Yi Q, Liu L, Liu X, Liu Q. Influence of Degradation of Poly-L-lactide on Mass Loss, Mechanical Properties, and Crystallinity in Phosphate-Buffered Solution. J MACROMOL SCI B 2009. [DOI: 10.1080/00222340802679755] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Zhihua Zhou
- a College of Chemistry and Chemical Engineering , Hunan University of Science and Technology , Xiangtan, P. R. China
| | - Qingfeng Yi
- a College of Chemistry and Chemical Engineering , Hunan University of Science and Technology , Xiangtan, P. R. China
| | - Lihua Liu
- a College of Chemistry and Chemical Engineering , Hunan University of Science and Technology , Xiangtan, P. R. China
| | - Xiaoping Liu
- a College of Chemistry and Chemical Engineering , Hunan University of Science and Technology , Xiangtan, P. R. China
| | - Qingquan Liu
- a College of Chemistry and Chemical Engineering , Hunan University of Science and Technology , Xiangtan, P. R. China
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152
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Benny O, Menon LG, Ariel G, Goren E, Kim SK, Stewman C, Black PM, Carroll RS, Machluf M. Local Delivery of Poly Lactic-co-glycolic Acid Microspheres Containing Imatinib Mesylate Inhibits Intracranial Xenograft Glioma Growth. Clin Cancer Res 2009; 15:1222-31. [DOI: 10.1158/1078-0432.ccr-08-1316] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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153
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Zhang H, Annunziata O. Macromolecular hydration compared with preferential hydration and their role on macromolecule-osmolyte coupled diffusion. Phys Chem Chem Phys 2009; 11:8923-32. [DOI: 10.1039/b910152g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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154
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Vera M, Puiggalí J, Coudane J. Microspheres from new biodegradable poly(ester amide)s with different ratios ofL- andD-alanine for controlled drug delivery. J Microencapsul 2008; 23:686-97. [PMID: 17118884 DOI: 10.1080/02652040600787942] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
A series of biodegradable poly (ester amide)s composed of sebacic acid, dodecanediol and different ratios of the stereoisomers of L- and D-alanine were synthesized for applications in drug delivery systems. Microspheres loaded with diclofenac sodium salt, triclosan and clofazimine were prepared with the solvent evaporation technique. No influence of polymer constitution in the drug release rate was found in vitro and no degradation occurred during the period of drug release. It was shown that a sustained delivery of the hydrophilic diclofenac sodium salt in Sörensen media occurred and it was controlled by diffusion. However, exhaustion of microspheres was feasible only from the most porous matrices where channelling had an important contribution.
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Affiliation(s)
- M Vera
- Departament d'Enginyeria Química, Universitat Politècnica de Catalunya, Barcelona, Spain.
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155
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Chausson M, Fluchère AS, Landreau E, Aguni Y, Chevalier Y, Hamaide T, Abdul-Malak N, Bonnet I. Block copolymers of the type poly(caprolactone)-b-poly(ethylene oxide) for the preparation and stabilization of nanoemulsions. Int J Pharm 2008; 362:153-62. [DOI: 10.1016/j.ijpharm.2008.06.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2008] [Revised: 06/04/2008] [Accepted: 06/07/2008] [Indexed: 11/25/2022]
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156
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Ho J, Wang H, Forde GM. Process considerations related to the microencapsulation of plasmid DNA via ultrasonic atomization. Biotechnol Bioeng 2008; 101:172-81. [PMID: 18646229 DOI: 10.1002/bit.21876] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
An effective means of facilitating DNA vaccine delivery to antigen presenting cells is through biodegradable microspheres. Microspheres offer distinct advantages over other delivery technologies by providing release of DNA vaccine in its bioactive form in a controlled fashion. In this study, biodegradable poly(D,L-lactide-co-glycolide) (PLGA) microspheres containing polyethylenimine (PEI) condensed plasmid DNA (pDNA) were prepared using a 40 kHz ultrasonic atomization system. Process synthesis parameters, which are important to the scale-up of microspheres that are suitable for nasal delivery (i.e., less than 20 microm), were studied. These parameters include polymer concentration; feed flowrate; volumetric ratio of polymer and pDNA-PEI (plasmid DNA-polyethylenimine) complexes; and nitrogen to phosphorous (N/P) ratio. PDNA encapsulation efficiencies were predominantly in the range 82-96%, and the mean sizes of the particle were between 6 and 15 microm. The ultrasonic synthesis method was shown to have excellent reproducibility. PEI affected morphology of the microspheres, as it induced the formation of porous particles that accelerate the release rate of pDNA. The PLGA microspheres displayed an in vitro release of pDNA of 95-99% within 30 days and demonstrated zero order release kinetics without an initial spike of pDNA. Agarose electrophoresis confirmed conservation of the supercoiled form of pDNA throughout the synthesis and in vitro release stages. It was concluded that ultrasonic atomization is an efficient technique to overcome the key obstacles in scaling-up the manufacture of encapsulated vaccine for clinical trials and ultimately, commercial applications.
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Affiliation(s)
- Jenny Ho
- Department of Chemical Engineering, Monash University, Clayton, 3800 VIC, Australia.
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157
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Thompson CJ, Hansford D, Munday DL, Higgins S, Rostron C, Hutcheon GA. Synthesis and evaluation of novel polyester-ibuprofen conjugates for modified drug release. Drug Dev Ind Pharm 2008; 34:877-84. [PMID: 18622877 DOI: 10.1080/03639040801929075] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Ibuprofen was conjugated at different levels to a novel polyester, poly(glycerol-adipate-co-omega-pentadecalactone) (PGA-co-PL), via an ester linkage to form a prodrug. The conjugates were characterized by differential scanning calorimetry (DSC), nuclear magnetic resonance (NMR), infrared (IR), gel permeation chromatography (GPC), ultraviolet (UV), and high-performance liquid chromatography (HPLC). The conjugates had a molecular weight between 18 and 24 kDa, and there was a suppression of the free hydroxyl groups within the conjugated polymer. DSC scans showed a lowering of the melting point (T(m)) when compared with the polyester alone and a difference in the number and area of T(m) peaks. Drug release studies showed an initial burst release (13-18%) followed thereafter by very slow release (maximum 35% after 18 days). Continuous work may produce ester-linked conjugates that are sufficiently labile to allow for complete release of ibuprofen over the time period studied.
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Affiliation(s)
- C J Thompson
- School of Pharmacy, The Robert Gordon University, Aberdeen, Scotland
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158
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Huang MJ, Gou ML, Qian ZY, Dai M, Li XY, Cao M, Wang K, Zhao J, Yang JL, Lu Y, Tu MJ, Wei YQ. One-step preparation of poly(ϵ-caprolactone)-poly(ethylene glycol)-poly(ε-caprolactone) nanoparticles for plasmid DNA delivery. J Biomed Mater Res A 2008; 86:979-86. [DOI: 10.1002/jbm.a.31704] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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159
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Wang KH, Wu TM, Shih YF, Huang CM. Water bamboo husk reinforced poly(lactic acid) green composites. POLYM ENG SCI 2008. [DOI: 10.1002/pen.21151] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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160
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Lin Y, Liu X, Dong Z, Li B, Chen X, Li YS. Amphiphilic Core−Shell Nanocarriers Based On Hyperbranched Poly(ester amide)-star-PCL: Synthesis, Characterization, and Potential as Efficient Phase Transfer Agent. Biomacromolecules 2008; 9:2629-36. [DOI: 10.1021/bm800607a] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ying Lin
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China, and Graduate School of the Chinese Academy of Sciences, Changchun Branch, Changchun 130022, China
| | - Xiaohui Liu
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China, and Graduate School of the Chinese Academy of Sciences, Changchun Branch, Changchun 130022, China
| | - Zhongmin Dong
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China, and Graduate School of the Chinese Academy of Sciences, Changchun Branch, Changchun 130022, China
| | - Baixiang Li
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China, and Graduate School of the Chinese Academy of Sciences, Changchun Branch, Changchun 130022, China
| | - Xuesi Chen
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China, and Graduate School of the Chinese Academy of Sciences, Changchun Branch, Changchun 130022, China
| | - Yue-Sheng Li
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China, and Graduate School of the Chinese Academy of Sciences, Changchun Branch, Changchun 130022, China
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161
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Nkansah MK, Tzeng SY, Holdt AM, Lavik EB. Poly(lactic-co-glycolic acid) nanospheres and microspheres for short- and long-term delivery of bioactive ciliary neurotrophic factor. Biotechnol Bioeng 2008; 100:1010-9. [PMID: 18431801 DOI: 10.1002/bit.21822] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Ciliary neurotrophic factor (CNTF) has been shown to be neuroprotective in the central nervous system (CNS). However, systemic administration and bolus injections have shown significant side effects and limited efficacy. Sustained, local delivery may lead to effective neuroprotection and avoid or limit adverse side effects, but sustained CNTF delivery has proven difficult to achieve and control. For controlled, sustained delivery, we investigated several processing variables in making poly(DL-lactic-co-glycolic acid) (PLGA) nano- and microspheres to optimize CNTF encapsulation and release. Nano- and microspheres were 314.9 +/- 24.9 nm and 11.69 +/- 8.16 microm in diameter, respectively. CNTF delivery from nanospheres was sustained over 14 days, and delivery from microspheres continued over more than 70 days. To assess protein bioactivity after encapsulation, neural stem cells (NSCs) were treated with CNTF released from nanospheres and compared to those treated with unencapsulated CNTF as a control. NSCs treated with CNTF expressed markers specific to mature cells, notably astrocytes; some increase in oligodendrocytic and neuronal marker expression was also observed. Significantly, cells treated with CNTF released by nanospheres exhibited a similar degree of differentiation when compared to those treated with control CNTF of equivalent concentration, showing that the process of protein encapsulation did not reduce its potency.
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Affiliation(s)
- Michael K Nkansah
- Department of Biomedical Engineering, Yale University, 55 Prospect Street, New Haven, Connecticut 06511, USA
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162
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Benny O, Fainaru O, Adini A, Cassiola F, Bazinet L, Adini I, Pravda E, Nahmias Y, Koirala S, Corfas G, D'Amato RJ, Folkman J. An orally delivered small-molecule formulation with antiangiogenic and anticancer activity. Nat Biotechnol 2008; 26:799-807. [PMID: 18587385 PMCID: PMC2803109 DOI: 10.1038/nbt1415] [Citation(s) in RCA: 128] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2008] [Accepted: 06/03/2008] [Indexed: 01/15/2023]
Abstract
Targeting angiogenesis, the formation of blood vessels, is an important modality for cancer therapy. TNP-470, a fumagillin analog, is among the most potent and broad-spectrum angiogenesis inhibitors. However, a major clinical limitation is its poor oral availability and short half-life, necessitating frequent, continuous parenteral administration. We have addressed these issues and report an oral formulation of TNP-470, named Lodamin. TNP-470 was conjugated to monomethoxy-polyethylene glycol-polylactic acid to form nanopolymeric micelles. This conjugate can be absorbed by the intestine and selectively accumulates in tumors. Lodamin significantly inhibits tumor growth, without causing neurological impairment in tumor-bearing mice. Using the oral route of administration, it first reaches the liver, making it especially efficient in preventing the development of liver metastasis in mice. We show that Lodamin is an oral nontoxic antiangiogenic drug that can be chronically administered for cancer therapy or metastasis prevention.
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Affiliation(s)
- Ofra Benny
- Vascular Biology Program and Department of Surgery, Children's Hospital Boston, Harvard Medical School, 1 Blackfan Circle, St. Karp Research Building, Boston, Massachusetts 02215, USA.
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163
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Takwa M, Hult K, Martinelle M. Single-Step, Solvent-Free Enzymatic Route to α,ω-Functionalized Polypentadecalactone Macromonomers. Macromolecules 2008. [DOI: 10.1021/ma800074a] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mohamad Takwa
- Royal Institute of Technology, School of Biotechnology, Department of Biochemistry, AlbaNova University Center, SE-106 91 Stockholm, Sweden
| | - Karl Hult
- Royal Institute of Technology, School of Biotechnology, Department of Biochemistry, AlbaNova University Center, SE-106 91 Stockholm, Sweden
| | - Mats Martinelle
- Royal Institute of Technology, School of Biotechnology, Department of Biochemistry, AlbaNova University Center, SE-106 91 Stockholm, Sweden
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164
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Fan J, Li Y, Jiang H, Tang G, Wang L. In vivo Degradation and histocompatibility of a novel class of fluorescent copolyanhydrides, poly{[di(p-carboxyphenyl) succinate]-co-(sebacic anhydride)}. Macromol Biosci 2008; 8:384-92. [PMID: 18383480 DOI: 10.1002/mabi.200700280] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
In this work, the in vivo degradation and tissue compatibility of a novel class of inherently fluorescent copolyanhydrides, P(dCPS:SA), were investigated. It was found that the degradation of the copolyanhydrides increased with the increase of SA content in the copolymers. The in vivo degradation rate of the copolymers was slower than that studied in vitro. A surface erosion characteristic of the copolyanhydrides was revealed by SEM and fluorescent microscopy. Mild inflammatory reactions were observed on days 6 and 10 after implantation for all the studied copolymers. By the end of 30 d, there were almost no inflammation reactions taking place.
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Affiliation(s)
- Jun Fan
- Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
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165
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Azouz SM, Walpole J, Amirifeli S, Taylor KN, Grinstaff MW, Colson YL. Prevention of local tumor growth with paclitaxel-loaded microspheres. J Thorac Cardiovasc Surg 2008; 135:1014-21. [DOI: 10.1016/j.jtcvs.2007.12.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2007] [Revised: 12/18/2007] [Accepted: 12/22/2007] [Indexed: 11/24/2022]
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166
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Jovanović I, Jordović B, Petković M, Ignjatović N, Uskoković D. Preparation of smallest microparticles of poly-D,L-lactide by modified precipitation method: influence of the process parameters. Microsc Res Tech 2008; 71:86-92. [PMID: 17937390 DOI: 10.1002/jemt.20529] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Biodegradable microspheres such as those made of poly-D,L-lactide (PDLLA) are widely investigated delivery systems for drugs or antigens. The aim of this study was to examine experimental conditions in order to produce PDLLA microspheres with the best properties for controlled and sustained drug delivery by the modified precipitation method. For this purpose, the following parameters were varied: co-solvent (methanol or ethanol), the concentration of stabilizer polyvinyl alcohol (PVA), chloroform-to-water ratio and the speed and time of homogenization. Scanning electron microscopy (SEM) and stereological analysis were used to characterize the particles. The average size and morphology of the microspheres varied substantially with preparation conditions from 8.44-1.25 microm. Results showed that the smallest particles were obtained with methanol, 1% PVA and with 10 min of homogenization at 21,000 rpm.
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Affiliation(s)
- Ivana Jovanović
- Institute of Technical Sciences of the Serbian Academy of Sciences and Arts, Belgrade, Serbia
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167
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Guo R, Zhang L, Zhu Z, Jiang X. Direct facile approach to the fabrication of chitosan-gold hybrid nanospheres. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:3459-3464. [PMID: 18290681 DOI: 10.1021/la703080j] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Chitosan-gold hybrid nanospheres were prepared through a direct facile approach that utilized cross-linked composite nanospheres consisting of low-molecular-weight chitosan (LWCS) and ethylenediaminetetraacetic acid (EDTA) as a precursor reaction system. EDTA was employed not only to construct the counterion interaction-based composite nanospheres with the cationic chitosan but also as the reductant for subsequent in situ gold salt reduction within the LWCS-EDTA composite nanospheres. This approach elegantly ensured that each and every nanosphere was loaded with gold nanoparticles and no nonembedded free gold nanoparticles would exist in the dispersing medium. Moreover, becauseof the noncovalent interaction between LWCS and EDTA, the EDTA reductant can be easily removed from the cross-linked nanospheres, and "pure" chitosan-gold hybrid nanospheres can be obtained. The obtained chitosan-gold hybrid nanospheres were found to have a tunable size and good dispersing stability within a wide pH range. The embedded gold nanoparticles were in the range from several to several tens of nanometers, which may be useful for sensing and imaging. Morphology studies indicated that most of the loaded gold nanoparticles were located in the interior of the hybrid nanospheres. Taking into account the good biocompatibilities of LWCS, abundant functional (amino) groups in chitosan, and the mild preparation conditions, we find that the chitosan-gold hybrid nanospheres prepared here may have tremendous potential in advanced biomedical applications.
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Affiliation(s)
- Rui Guo
- Laboratory of Mesoscopic Chemistry and Department of Polymer Science & Engineering, College of Chemistry & Chemical Engineering, and Jiangsu Provincial Laboratory for Nanotechnology, Nanjing University, Nanjing, 210093, PR China
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168
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Abstract
Hydrogel microspheres were prepared from the major softwood hemicellulose polysaccharide acetylated galactoglucomannan. The dry and swollen morphology was assessed by scanning electron microscopy. The microspheres were loaded with either a small hydrophilic substance (caffeine) or a macromolecular model protein (bovine serum albumin) and afforded diffusion controlled release in vitro. Statistical multivariate analysis was used to systematically determine the influence and significance of the hydrogel composition, the crosslinking density, and the dimensions of the incorporated substance on the microsphere size and release rate.
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Affiliation(s)
- U. Edlund
- Fibre and Polymer Technology, School of Chemical Science and Engineering Royal Institute of Technology (KTH), SE-100 44 Stockholm, Sweden
| | - A.-C. Albertsson
- Fibre and Polymer Technology, School of Chemical Science and Engineering Royal Institute of Technology (KTH), SE-100 44 Stockholm, Sweden,
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169
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Ražem D, Katušin-Ražem B. The effects of irradiation on controlled drug delivery/controlled drug release systems. Radiat Phys Chem Oxf Engl 1993 2008. [DOI: 10.1016/j.radphyschem.2007.06.006] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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170
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Xiao Y, Cummins D, Palmans ARA, Koning CE, Heise A. Synthesis of biodegradable chiral polyesters by asymmetric enzymatic polymerization and their formulation into microspheres. SOFT MATTER 2008; 4:593-599. [PMID: 32907226 DOI: 10.1039/b717059a] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Materials with selective bio-responsiveness could have potential in medical applications. Here we report the synthesis of chiral microspheres obtained from non-crystalline aliphatic polyesters, with the aim to use chirality to program polymer microsphere degradation. By enzymatic enantioselective kinetic resolution polymerization from racemic monomers, hydroxyl-terminated (R)-, (S)- and racemic poly-(4-methylcaprolatone) (PMCL) were successfully synthesized. Preliminary degradation experiments with Candida Antarctica Lipase B show that the degradation rate can be tuned by the polymer chirality. Chiral microspheres around 40 microns were obtained after acrylation of the polymers and subsequent in situ cross-linking in an oil-in-water (O-W) emulsion evaporation approach.
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Affiliation(s)
- Yan Xiao
- Department of Polymer Chemistry, Technische Universiteit Eindhoven, Den Dolech 2, P.O. Box 513, Eindhoven, 5600 MB, The Netherlands.
| | - David Cummins
- Department of Polymer Chemistry, Technische Universiteit Eindhoven, Den Dolech 2, P.O. Box 513, Eindhoven, 5600 MB, The Netherlands.
| | - Anja R A Palmans
- Department of Macromolecular and Organic Chemistry, Technische Universiteit Eindhoven, Den Dolech 2, P.O. Box 513, Eindhoven, 5600 MB, The Netherlands
| | - Cor E Koning
- Department of Polymer Chemistry, Technische Universiteit Eindhoven, Den Dolech 2, P.O. Box 513, Eindhoven, 5600 MB, The Netherlands.
| | - Andreas Heise
- Department of Polymer Chemistry, Technische Universiteit Eindhoven, Den Dolech 2, P.O. Box 513, Eindhoven, 5600 MB, The Netherlands.
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171
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Henry GRP, Heise A, Bottai D, Formenti A, Gorio A, Di Giulio AM, Koning CE. Acrylate End-Capped Poly(ester-carbonate) and Poly(ether-ester)s for Polymer-on-Multielectrode Array Devices: Synthesis, Photocuring, and Biocompatibility. Biomacromolecules 2008; 9:867-78. [DOI: 10.1021/bm701191e] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Gaëtan R. P. Henry
- Laboratory of Polymer Chemistry, Eindhoven University of Technology Technology (TU/e), P.O. Box 513, 5600 MB Eindhoven, The Netherlands, DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands, Dipartimento di Medicina, Chirurgia e Odontoiatria Ospedale S. Paolo, Università di Milano, Via Di Rudinì 8, Milan I-20142, Italy, and Instituto di Fisiologia Umana II, Università di Milano, Via Mangiagalli 32, Milan I-20133, Italy
| | - Andreas Heise
- Laboratory of Polymer Chemistry, Eindhoven University of Technology Technology (TU/e), P.O. Box 513, 5600 MB Eindhoven, The Netherlands, DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands, Dipartimento di Medicina, Chirurgia e Odontoiatria Ospedale S. Paolo, Università di Milano, Via Di Rudinì 8, Milan I-20142, Italy, and Instituto di Fisiologia Umana II, Università di Milano, Via Mangiagalli 32, Milan I-20133, Italy
| | - Daniele Bottai
- Laboratory of Polymer Chemistry, Eindhoven University of Technology Technology (TU/e), P.O. Box 513, 5600 MB Eindhoven, The Netherlands, DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands, Dipartimento di Medicina, Chirurgia e Odontoiatria Ospedale S. Paolo, Università di Milano, Via Di Rudinì 8, Milan I-20142, Italy, and Instituto di Fisiologia Umana II, Università di Milano, Via Mangiagalli 32, Milan I-20133, Italy
| | - Alessandro Formenti
- Laboratory of Polymer Chemistry, Eindhoven University of Technology Technology (TU/e), P.O. Box 513, 5600 MB Eindhoven, The Netherlands, DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands, Dipartimento di Medicina, Chirurgia e Odontoiatria Ospedale S. Paolo, Università di Milano, Via Di Rudinì 8, Milan I-20142, Italy, and Instituto di Fisiologia Umana II, Università di Milano, Via Mangiagalli 32, Milan I-20133, Italy
| | - Alfredo Gorio
- Laboratory of Polymer Chemistry, Eindhoven University of Technology Technology (TU/e), P.O. Box 513, 5600 MB Eindhoven, The Netherlands, DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands, Dipartimento di Medicina, Chirurgia e Odontoiatria Ospedale S. Paolo, Università di Milano, Via Di Rudinì 8, Milan I-20142, Italy, and Instituto di Fisiologia Umana II, Università di Milano, Via Mangiagalli 32, Milan I-20133, Italy
| | - Anna Maria Di Giulio
- Laboratory of Polymer Chemistry, Eindhoven University of Technology Technology (TU/e), P.O. Box 513, 5600 MB Eindhoven, The Netherlands, DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands, Dipartimento di Medicina, Chirurgia e Odontoiatria Ospedale S. Paolo, Università di Milano, Via Di Rudinì 8, Milan I-20142, Italy, and Instituto di Fisiologia Umana II, Università di Milano, Via Mangiagalli 32, Milan I-20133, Italy
| | - Cor E. Koning
- Laboratory of Polymer Chemistry, Eindhoven University of Technology Technology (TU/e), P.O. Box 513, 5600 MB Eindhoven, The Netherlands, DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands, Dipartimento di Medicina, Chirurgia e Odontoiatria Ospedale S. Paolo, Università di Milano, Via Di Rudinì 8, Milan I-20142, Italy, and Instituto di Fisiologia Umana II, Università di Milano, Via Mangiagalli 32, Milan I-20133, Italy
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172
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Takwa M, Xiao Y, Simpson N, Malmström E, Hult K, Koning CE, Heise A, Martinelle M. Lipase Catalyzed HEMA Initiated Ring-Opening Polymerization: In Situ Formation of Mixed Polyester Methacrylates by Transesterification. Biomacromolecules 2008; 9:704-10. [DOI: 10.1021/bm7010449] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mohamad Takwa
- School of Biotechnology, Department of Biochemistry, AlbaNova University Center, Royal Institute of Technology, SE-106 91 Stockholm, Sweden, School of Chemical Science and Engineering, Department of Fiber and Polymer Technology, Teknikringen 56-58, Royal Institute of Technology, SE-100 44 Stockholm, Sweden, and Department of Polymer Chemistry, PO Box 513, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Yan Xiao
- School of Biotechnology, Department of Biochemistry, AlbaNova University Center, Royal Institute of Technology, SE-106 91 Stockholm, Sweden, School of Chemical Science and Engineering, Department of Fiber and Polymer Technology, Teknikringen 56-58, Royal Institute of Technology, SE-100 44 Stockholm, Sweden, and Department of Polymer Chemistry, PO Box 513, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Neil Simpson
- School of Biotechnology, Department of Biochemistry, AlbaNova University Center, Royal Institute of Technology, SE-106 91 Stockholm, Sweden, School of Chemical Science and Engineering, Department of Fiber and Polymer Technology, Teknikringen 56-58, Royal Institute of Technology, SE-100 44 Stockholm, Sweden, and Department of Polymer Chemistry, PO Box 513, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Eva Malmström
- School of Biotechnology, Department of Biochemistry, AlbaNova University Center, Royal Institute of Technology, SE-106 91 Stockholm, Sweden, School of Chemical Science and Engineering, Department of Fiber and Polymer Technology, Teknikringen 56-58, Royal Institute of Technology, SE-100 44 Stockholm, Sweden, and Department of Polymer Chemistry, PO Box 513, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Karl Hult
- School of Biotechnology, Department of Biochemistry, AlbaNova University Center, Royal Institute of Technology, SE-106 91 Stockholm, Sweden, School of Chemical Science and Engineering, Department of Fiber and Polymer Technology, Teknikringen 56-58, Royal Institute of Technology, SE-100 44 Stockholm, Sweden, and Department of Polymer Chemistry, PO Box 513, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Cor E. Koning
- School of Biotechnology, Department of Biochemistry, AlbaNova University Center, Royal Institute of Technology, SE-106 91 Stockholm, Sweden, School of Chemical Science and Engineering, Department of Fiber and Polymer Technology, Teknikringen 56-58, Royal Institute of Technology, SE-100 44 Stockholm, Sweden, and Department of Polymer Chemistry, PO Box 513, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Andreas Heise
- School of Biotechnology, Department of Biochemistry, AlbaNova University Center, Royal Institute of Technology, SE-106 91 Stockholm, Sweden, School of Chemical Science and Engineering, Department of Fiber and Polymer Technology, Teknikringen 56-58, Royal Institute of Technology, SE-100 44 Stockholm, Sweden, and Department of Polymer Chemistry, PO Box 513, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
| | - Mats Martinelle
- School of Biotechnology, Department of Biochemistry, AlbaNova University Center, Royal Institute of Technology, SE-106 91 Stockholm, Sweden, School of Chemical Science and Engineering, Department of Fiber and Polymer Technology, Teknikringen 56-58, Royal Institute of Technology, SE-100 44 Stockholm, Sweden, and Department of Polymer Chemistry, PO Box 513, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands
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173
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Geus MD, Peters R, Koning CE, Heise A. Insights into the Initiation Process of Enzymatic Ring-Opening Polymerization from Monofunctional Alcohols Using Liquid Chromatography under Critical Conditions. Biomacromolecules 2008; 9:752-7. [DOI: 10.1021/bm701158y] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthijs de Geus
- Department of Polymer Chemistry, Technische Universiteit Eindhoven, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands, and DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands
| | - Ron Peters
- Department of Polymer Chemistry, Technische Universiteit Eindhoven, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands, and DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands
| | - Cor E. Koning
- Department of Polymer Chemistry, Technische Universiteit Eindhoven, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands, and DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands
| | - Andreas Heise
- Department of Polymer Chemistry, Technische Universiteit Eindhoven, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands, and DSM Research, P.O. Box 18, 6160 MD Geleen, The Netherlands
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174
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Preparation of biodegradable porous poly(butylene succinate) microspheres. HEMIJSKA INDUSTRIJA 2008. [DOI: 10.2298/hemind0806329p] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The aim of this study was to determine the optimal conditions for the fabrication of porous microspheres based on poly(butylene succinate), PBS. The biodegradable non-porous PBS microspheres were prepared by the oil-in-water (o/w) emulsion solvent evaporation method using poly(vinyl alcohol), PVA, as the surfactant. Fabrication conditions, such as stirring rate, organic/aqueous ratio, PBS concentration and surfactant (PVA) concentration, which have an important influence on both the particle size and the morphology of the microspheres, were varied. Scanning electron microscopy, SEM, observations confirmed the size, size distribution and surface morphology of the microspheres. The optimal conditions for the preparation of the non-porous microspheres were found to be: concentration the PBS solution, 10 mass%; PVA concentration, 1 mass%; the organic/ aqueous ratio CHCl3/H2O = 1/20 and stirring rate 800 rpm. Porous PBS microspheres were fabricated under the optimal conditions using various amounts of hexane and poly(ethylene oxide), PEO, as porogens. The influence of the amount of porogen on the pore size and the particle size was investigated using SEM and the apparent density. The microspheres exhibited various porosities and the pore sizes. The average particle size of the microspheres with PEO as the porogen was from 100 to 122?m and that of the microspheres with hexane as the porogen was from 87 to 97?m. The apparent density of the porous microspheres with PEO as the porogen, from 0.16 to 0.23 g/cm3, was much smaller than the non-porous microspheres, 0.40 g/cm3. In the in vitro degradation experiments, the porous microspheres were incubated in phosphate buffer solution (pH 7) at 37?C. After incubating for one month, the microspheres showed significant extent of the hydrolytic degradation of the porous PBS microspheres.
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175
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Niu X, Luo Y, Li Y, Fu C, Chen J, Wang Y. Design of bioinspired polymeric materials based on poly(D,L-lactic acid) modifications towards improving its cytocompatibility. J Biomed Mater Res A 2008; 84:908-16. [PMID: 17647223 DOI: 10.1002/jbm.a.31360] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
To design novel bioinspired polymeric material, poly(D,L-lactic acid) (DL-PLA) was on the base and modified in the bulk. Firstly, maleic anhydride (MA) groups were introduced to the side chain of DL-PLA by the way of melting free radical copolymerization using benzoyl peroxide as an initiator. Then, to neutralize the acid generated during DL-PLA degradation, aliphatic diamine was immobilized by the N-acylation of anhydrides with butanediamine. As the following stage, adhesive peptides Arg-Gly-Asp-Ser (RGDS) were grafted into the backbone of DL-PLA by using carbodiimide as a coupling agent, in order to endow DL-PLA with bioactivity and biospecificity. The characterizations of the obtained polymers were by the means of GPC-MALLS, FTIR, (13)C NMR and XPS to explore the structures and rhodamine-carboxyl interaction method, ninhydrin reaction and amino acid analyzer to determine the content of MA, butanediamine, and RGDS, respectively, followed the test of pH changes during degradation in distilled water (pH = 6.45). Finally, the osteoblast behavior on different DL-PLA based films was investigated and the results indicated that the introduction of diamine could promote cell attachment and viability, and the incorporation of RGDS further improved its cytocompatibility. The synthetic DL-PLA based bioinspired material may have potentials for tissue engineering and other biomedical applications.
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Affiliation(s)
- Xufeng Niu
- Research Center of Bioinspire Material Science and Engineering, Department of Bioengineering, Chongqing University, Chongqing 400030, People's Republic of China
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176
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An assessment of the interactions between diclofenac sodium and ammonio methacrylate copolymer using thermal analysis and Raman spectroscopy. J Pharm Biomed Anal 2008; 46:288-94. [DOI: 10.1016/j.jpba.2007.10.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2007] [Revised: 10/04/2007] [Accepted: 10/06/2007] [Indexed: 11/18/2022]
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177
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Wan WK, Yang L, Padavan DT. Use of degradable and nondegradable nanomaterials for controlled release. Nanomedicine (Lond) 2007; 2:483-509. [PMID: 17716133 DOI: 10.2217/17435889.2.4.483] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Drug-delivery devices are fundamentally important in improving the pharmacological profiles of therapeutic molecules. Nanocontrolled-release systems are attracting a lot of attention currently owing to their large surface area and their ability to target delivery to specific sites in the human body. In addition, they can penetrate the cell membrane for gene, nucleic acid and bioactive peptide/protein delivery. Representative applications of nanodrug-delivery systems include controlled-release wound dressings, controlled-release scaffolds for tissue regeneration and implantable biodegradable nanomaterial-based medical devices integrated with drug-delivery functions. We review the present status and future perspectives of various types of nanocontrolled-release systems. Although many of the well-established degradable and nondegradable controlled-release vehicles are being investigated for their processing into nanocarriers, several new emerging nanomaterials are being studied for their controlled-release properties. The release of multiple bioactive agents, each with its own kinetic profile, is becoming possible. In addition, integration of the nanocontrolled-release systems with other desirable functions to create new, cross-discipline applications can also be realized.
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Affiliation(s)
- W K Wan
- University of Western Ontario, Biomedical Engineering Graduate Program, London, Ontario, Canada.
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178
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Benny O, Kim SK, Gvili K, Radzishevsky IS, Mor A, Verduzco L, Menon LG, Black PM, Machluf M, Carroll RS. In vivo
fate and therapeutic efficacy of PF‐4/CTF microspheres in an orthotopic human glioblastoma model. FASEB J 2007; 22:488-99. [PMID: 17873103 DOI: 10.1096/fj.07-8801com] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The correlation between glioma grade and angiogenesis suggests that antiangiogenic therapies are potentially therapeutically effective for these tumors. However, to achieve tumor suppression, antiangiogenic therapies need to be administered daily using high systemic quantities. We designed a biodegradable polymeric device that overcomes those barriers by providing sustained local delivery of a C-terminal fragment of platelet factor 4 (PF-4/CTF), an antiangiogenic agent. Fluorescent-labeled microspheres composed of poly lactic-coglycolic acid (PLGA) were loaded with rhodamine-labeled PF-4/CTF and formulated to release their contents over time. Fluorescent labeling enabled the correlation between the in vitro to the in vivo kinetic and release studies. PF-4/CTF microspheres were injected into established intracranial human glioma tumors in nude mice. Noninvasive magnetic resonance imaging (MRI) was used to assess the therapeutic response. Tumor size, microvessel density, proliferation, and apoptosis rate were measured by histological analysis. Intracranially, the microspheres were located throughout the tumor bed and continuously released PF-4/CTF during the entire experimental period. MRI and histological studies showed that a single injection of microspheres containing PF-4/CTF caused a 65.2% and 72% reduction in tumor volume, respectively, with a significant decrease in angiogenesis and an increase in apoptosis. Our data demonstrate that polymeric microspheres are an effective therapeutic approach for delivering antiangiogenic agents that result in the inhibition of glioma tumor growth.
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Affiliation(s)
- Ofra Benny
- M.M., Department of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, Israel
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179
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Peng D, Huang K, Liu Y, Liu S. Preparation of novel polymeric microspheres for controlled release of finasteride. Int J Pharm 2007; 342:82-6. [PMID: 17580108 DOI: 10.1016/j.ijpharm.2007.05.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2006] [Revised: 04/24/2007] [Accepted: 05/03/2007] [Indexed: 10/23/2022]
Abstract
The utility of the novel polycarbonate, poly(propylene carbonate maleate) (PPCM) to encapsulate and control the release of finasteride, via microspheres, was investigated. The PPCM microspheres loaded with finasteride were elaborated by a simple oil-in-water (O/W) emulsion-solvent evaporation method. Various manufacturing parameters, including the concentration of polymer in dichloromethane (DCM) and the polymer:finasteride ratios were altered to optimize process variables during the microspheres production. The effects of these changes on the characteristics of the microspheres were examined. The structure and morphology were characterized by wide-angle X-ray diffraction (WXRD) and scanning electron microscopy (SEM). The results showed that the mean diameter of microspheres was approximately 2mum, and had both smooth and spherical surfaces. Greater encapsulation efficiency was obtained by increasing the ratios of polymer:finasteride and the concentration of PPCM in DCM. In vitro drug release of these microcapsules was performed in a pH 7.4 phosphate-buffered solution. The release profiles of finasteride from PPCM microcapsules were found to be biphasic with a burst release followed by a gradual release phase. A prolonged in vitro drug release profile was observed. After an initial burst, a continuous drug release was observed for up to 5-6 weeks.
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Affiliation(s)
- Dongming Peng
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China
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180
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Luo Y, Wang Y, Niu X, Fu C, Wang S. Synthesis, characterization and biodegradation of butanediamine-grafted poly(dl-lactic acid). Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2007.06.022] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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181
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Goh YK, Whittaker AK, Monteiro MJ. Versatile synthetic approach to reversible crosslinked polystyrene networks via RAFT polymerization. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.22162] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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182
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Gottschalk C, Wolf F, Frey H. Multi-Arm Star Poly(L-lactide) with Hyperbranched Polyglycerol Core. MACROMOL CHEM PHYS 2007. [DOI: 10.1002/macp.200700168] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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183
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Höglund A, Hakkarainen M, Albertsson A. Degradation Profile of Poly(ϵ‐caprolactone)–the Influence of Macroscopic and Macromolecular Biomaterial Design. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2007. [DOI: 10.1080/10601320701424487] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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184
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Shen Q, Liu DS. Cellulose/poly(ethylene glycol) blend and its controllable drug release behaviors in vitro. Carbohydr Polym 2007. [DOI: 10.1016/j.carbpol.2006.10.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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185
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Wang C, Ye W, Zheng Y, Liu X, Tong Z. Fabrication of drug-loaded biodegradable microcapsules for controlled release by combination of solvent evaporation and layer-by-layer self-assembly. Int J Pharm 2007; 338:165-73. [PMID: 17324539 DOI: 10.1016/j.ijpharm.2007.01.049] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2006] [Revised: 01/16/2007] [Accepted: 01/28/2007] [Indexed: 11/21/2022]
Abstract
The initial burst release of drug from polymer microparticles remains an unsolved problem. Here, we deposited polysaccharides on drug-loaded microspheres using layer-by-layer self-assembly to produce core-shell microparticles for sustained drug release. The ibuprofen (IBU)-loaded poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) microparticles were fabricated by conventional solvent evaporation. The processing parameters, such as pH of water phase, drug/polymer ratio, polymer type, and emulsifier concentration, were optimized according to the encapsulation efficiency and drug loading as pH 4.0, drug/polymer ratio=10/50 (wt), HV in PHBV=6wt.%, and PVA concentration=1% (w/v). The multilayer shells of chitosan (CHI)/sodium alginate (ALG) and poly(diallyldimethylammonium chloride) (PD)/sodium poly(styrenesulfonate) (PSS) were formed on the IBU-loaded PHBV microparticles using layer-by-layer self-assembly. The in vitro release experiments revealed that, as for the microparticles with three CHI/ALG bilayer shells, the initial burst release of IBU from the microparticles was significantly suppressed and the half release time was prolonged to 62h from 1h for the microparticles without coverage. The compact CHI/ALG multilayer film was observed with an atomic force microscopy (AFM) due to the matched distance of charges along the CHI chain and those along the ALG chains. The present combination for encapsulating drug-loaded microparticles demonstrates an effective way to prolong the drug release with reduced initial burst.
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Affiliation(s)
- Chaoyang Wang
- Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, China
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186
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Tsarevsky NV, Matyjaszewski K. “Green” Atom Transfer Radical Polymerization: From Process Design to Preparation of Well-Defined Environmentally Friendly Polymeric Materials. Chem Rev 2007; 107:2270-99. [PMID: 17530906 DOI: 10.1021/cr050947p] [Citation(s) in RCA: 1017] [Impact Index Per Article: 59.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Nicolay V Tsarevsky
- Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, USA
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187
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Chen F, Zhu WP, Shen ZQ. Homopolymerization and Copolymerization of Adipic Anhydride withɛ-Caprolactone Catalyzed by Rare Earth Trisphenolate. CHINESE J CHEM 2007. [DOI: 10.1002/cjoc.200790076] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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188
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Ren L, Agarwal S. Synthesis, Characterization, and Properties Evaluation of Poly[(N-isopropylacrylamide)-co-ester]s. MACROMOL CHEM PHYS 2007. [DOI: 10.1002/macp.200600484] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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189
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Liu Y, Huang K, Peng D, Liu S, Wu H. Preparation of poly(butylene-co-ɛ-caprolactone carbonate) and their use as drug carriers for a controlled delivery system. ACTA ACUST UNITED AC 2007. [DOI: 10.1002/pola.21981] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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190
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Saatchi K, Häfeli UO. One-pot syntheses, coordination, and characterization of application-specific biodegradable ligand-polymers. Dalton Trans 2007:4439-45. [PMID: 17909655 DOI: 10.1039/b708177d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Syntheses and chelation of tailored biodegradable polymers to rhenium for medicinal applications are described. A group of bifunctional ligand-initiators consisting of a chelating end for metal complexation and a hydroxyl end suitable to initiate polymerization was utilized in the ring-opening polymerization of l-lactide. The resulting biodegradable ligand-polymers were equipped with a tridentate donor set to coordinate specific metal ions. All synthesized compounds were characterized by IR spectroscopy, 1D/2D NMR spectroscopy and MALDI-TOF mass spectrometry, confirming successful polymerization and coordination to the [Re(CO)(3)](+) core. The pliability of designing application-specific polymers with respect to the nature of the metal ion facilitates extending the application of these biodegradable polymers to early detection of diseases (imaging) and radiotherapy of cancers.
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Affiliation(s)
- Katayoun Saatchi
- Faculty of Pharmaceutical Sciences, University of British Columbia, 2146 East Mall, Vancouver, British Columbia V6T 1Z3, Canada
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191
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Synthesis, characterization and hydrolysis of an aliphatic polycarbonate by terpolymerization of carbon dioxide, propylene oxide and maleic anhydride. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.10.024] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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192
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Williams HE, Huxley J, Claybourn M, Booth J, Hobbs M, Meehan E, Clark B. The effect of γ-irradiation and polymer composition on the stability of PLG polymer and microspheres. Polym Degrad Stab 2006. [DOI: 10.1016/j.polymdegradstab.2006.01.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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193
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Wu TM, Wu CY. Biodegradable poly(lactic acid)/chitosan-modified montmorillonite nanocomposites: Preparation and characterization. Polym Degrad Stab 2006. [DOI: 10.1016/j.polymdegradstab.2006.01.004] [Citation(s) in RCA: 157] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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194
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Coulembier O, Degée P, Hedrick JL, Dubois P. From controlled ring-opening polymerization to biodegradable aliphatic polyester: Especially poly(β-malic acid) derivatives. Prog Polym Sci 2006. [DOI: 10.1016/j.progpolymsci.2006.08.004] [Citation(s) in RCA: 251] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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195
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Ray SS, Bousmina M. Crystallization Behavior of Poly[(butylene succinate)-co-adipate] Nanocomposite. MACROMOL CHEM PHYS 2006. [DOI: 10.1002/macp.200600163] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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196
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Sosnowski S, Woźniak P, Lewandowska-Szumieł M. Polyester Scaffolds with Bimodal Pore Size Distribution for Tissue Engineering. Macromol Biosci 2006; 6:425-34. [PMID: 16761274 DOI: 10.1002/mabi.200600003] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This paper presents a method for the preparation of porous poly(L-lactide)/poly[(L-lactide)-co-glycolide] scaffolds for tissue engineering. Scaffolds were prepared by a mold pressing-salt leaching technique from structured microparticles. The total porosity was in the range 70-85%. The pore size distribution was bimodal. Large pores, susceptible for osteoblasts growth and proliferation had the dimensions 50-400 microm. Small pores, dedicated to the diffusion of nutrients or/and metabolites of bone forming cells, as well as the products of hydrolysis of polyesters from the walls of the scaffold, had sizes in the range 2 nm-5 microm. The scaffolds had good mechanical strength (compressive modulus equal to 41 MPa and a strength of 1.64 MPa for 74% porosity). Scaffolds were tested in vitro with human osteoblast-like cells (MG-63). It was found that the viability of cells seeded within the scaffolds obtained using the mold pressing-salt leaching technique from structured microparticles was better when compared to cells cultured in scaffolds obtained by traditional methods. After 34 d of culture, cells within the tested scaffolds were organized in a tissue-like structure. Photos of section of macro- and mesoporous PLLA/PLGA scaffold containing 50 wt.-% of PLGA microspheres after 34 d of culture. Dark spots mark MG-63 cells, white areas belong to the scaffold. The specimen was stained with haematoxylin/eosin. Bar = 100 microm.
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Affiliation(s)
- Stanislaw Sosnowski
- Center of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, 90-363 Lodz, Poland.
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197
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Leo E, Ruozi B, Tosi G, Vandelli MA. PLA-microparticles formulated by means a thermoreversible gel able to modify protein encapsulation and release without being co-encapsulated. Int J Pharm 2006; 323:131-8. [PMID: 16815657 DOI: 10.1016/j.ijpharm.2006.05.047] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2006] [Revised: 05/18/2006] [Accepted: 05/24/2006] [Indexed: 11/27/2022]
Abstract
The aim of this work was to develop a novel strategy for the formulation of biodegradable PLA microspheres as delivery systems for proteins or peptides. The strategy is based on the exploitation of the gel-sol transition of the thermoreversible Pluronic F127 gel. The gel allows the formation of the particles without be co-entrapped in the matrix. The microspheres prepared using the novel technique (TG-Ms, or thermoreversible gel-method microspheres) were characterized in vitro (as concerns the size, the morphology, the protein encapsulation, the release and the protein distribution in the polymer matrix), in comparison with microspheres prepared using the classical double emulsion/solvent evaporation method (w/o/w-Ms). Two types of bovine serum albumin (BSA), with different water solubility, were used as model proteins. TG-Ms exhibited small size (7-50 m) and high protein content (8.6%, w/w) regardless of the BSA water solubility, in contrast with w/o/w-Ms, which revealed a size range of 100-130 microm and a protein content related to the BSA water solubility. TG-Ms, in spite of their smaller size respect of the w/o/w-Ms, displayed a reduced initial burst effect and a higher rate in the second release phase that resulted in a quasi-constant profile. The release behavior of the TG-Ms may be attributable to both the localization of the protein in the particle core, as shown by the confocal laser scanning microscopy analysis on labeled-BSA loaded microspheres, and the few pores in the matrix, as shown by the scanning electron microscopy. A working hypothesis about the mechanism of the particle formation was also discussed.
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Affiliation(s)
- Eliana Leo
- Department of Pharmaceutical Science, University of Modena and Reggio Emilia, Via Campi, 183, Modena 41100, Italy
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198
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Xu XJ, Sy JC, Prasad Shastri V. Towards developing surface eroding poly(alpha-hydroxy acids). Biomaterials 2006; 27:3021-30. [PMID: 16455136 DOI: 10.1016/j.biomaterials.2005.12.006] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2005] [Accepted: 12/07/2005] [Indexed: 10/25/2022]
Abstract
We have prepared a library of biodegradable polyesters derived from poly(alpha-hydroxy acids) (PHAs) that appear to primarily exhibit surface erosion behavior. This was achieved by increasing the hydrophobicity of the polymers in two distinct steps, namely: macromer formation and a coupling step. In the first step, macromerdiols (MDs) with varying lipophilicities were prepared by polymerization of L-lactide or mixture of L-lactide and glycolide (3/1 by mole) to various lengths (n = 10, 20, 30, and 40) using alkanediols of increasing C-chain length (C6, C8, and C12) as initiators in the presence of Tin(II) catalyst. In the second step, the macromer diols were linked together with diacid dichlorides of varying C-chain lengths (C6, C8, C10, and C12) to yield polyesters ranging in molecular weight (Mw) from 20 to 130 KDa and polydispersity of 1.5-6. These polyesters exhibited different thermal behavior from pure PHAs that can be tuned by changing the initiator core, the lactide/glycolide chain length, and diacid dichloride type. In addition, all these polymers showed solubility in tetrahydrofuran unlike poly(L-lactic acid) (PLLA) and poly(lactide-co-glycolide) (PLGA). In contrast to PLLA and PLGA, the degradation behavior of these novel polyesters exhibited linear profiles consistent with a surface erosion behavior. Release studies using Congo red as a model drug from microspheres prepared from these polyesters showed linear release profiles with correlation constants of least-square fits approaching a value of unity. Degradable polyesters with tunable thermal and degradation behavior may find applications in drug delivery and tissue engineering, where control over these parameters is critical to ensure predictable outcomes.
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Affiliation(s)
- Xiao-Jun Xu
- Department of Materials Science and Engineering, University of Pennsylvania, 3231 Walnut Street, Philadelphia, Pennsylvania 19104, USA
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Miao ZM, Cheng SX, Zhang XZ, Zhuo RX. Study on Drug Release Behaviors of Poly-α,β-[N-(2-hydroxyethyl)-l-aspartamide]-g-poly(ε-caprolactone) Nano- and Microparticles. Biomacromolecules 2006; 7:2020-6. [PMID: 16768428 DOI: 10.1021/bm060200o] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Biodegradable amphiphilic graft copolymers poly-alpha,beta-[N-(2-hydroxyethyl)-L-aspartamide]-g-poly(epsilon-caprolactone) (PHEA-g-PCL) with different branch lengths were synthesized through the ring-opening polymerization of epsilon-caprolactone initiated by the macroinitiator PHEA bearing hydroxyl groups. With use of the graft copolymers with different compositions, nanoparticle drug delivery systems with sizes smaller than 100 nm were prepared by a dialysis method, and microparticle drug delivery systems with sizes smaller than 5 microm were fabricated by a melting-emulsion method. The regularly spherical shapes of the drug-loaded nano- and microparticles were verified by transmission electron microscopy and scanning electron microscopy. In vitro drug release properties of nano- and microparticle drug delivery systems were investigated, with the emphasis on the effects of polymer composition, particle size, and drug-loading content on the release behaviors.
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Affiliation(s)
- Zhi-Mei Miao
- Key Laboratory of Biomedical Polymers of Ministry of Education, Department of Chemistry, Wuhan University, Wuhan 430072, PR China
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