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Szymusiak M, Kalkowski J, Luo H, Donovan AJ, Zhang P, Liu C, Shang W, Irving T, Herrera-Alonso M, Liu Y. Core-shell Structure and Aggregation Number of Micelles Composed of Amphiphilic Block Copolymers and Amphiphilic Heterografted Polymer Brushes Determined by Small-Angle X-ray Scattering. ACS Macro Lett 2017; 6:1005-1012. [PMID: 29308298 DOI: 10.1021/acsmacrolett.7b00490] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A large group of functional nanomaterials employed in biomedical applications, including targeted drug delivery, relies on amphiphilic polymers to encapsulate therapeutic payloads via self-assembly processes. Knowledge of the micelle structures will provide critical insights into design of polymeric drug delivery systems. Core-shell micelles composed of linear diblock copolymers poly(ethylene glycol)-b-poly(caprolactone) (PEG-b-PCL), poly(ethylene oxide)-b-poly(lactic acid) (PEG-b-PLA), as well as a heterografted brush consisting of a poly(glycidyl methacrylate) backbone with PEG and PLA branches (PGMA-g-PEG/PLA) were characterized by dynamic light scattering (DLS) and small angle X-ray scattering (SAXS) measurements to gain structural information regarding the particle morphology, core-shell size, and aggregation number. The structural information at this quasi-equilibrium state can also be used as a reference when studying the kinetics of polymer micellization.
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Affiliation(s)
- Magdalena Szymusiak
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Joseph Kalkowski
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Hanying Luo
- Department
of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Alexander J. Donovan
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Pin Zhang
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Chang Liu
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
| | - Weifeng Shang
- Department
of Biological Sciences, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | - Thomas Irving
- Department
of Biological Sciences, Illinois Institute of Technology, Chicago, Illinois 60616, United States
| | - Margarita Herrera-Alonso
- Department
of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, United States
| | - Ying Liu
- Department
of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, United States
- Department
of Biopharmaceutical Sciences, University of Illinois at Chicago, Chicago, Illinois 60612, United States
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2
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Kidd BE, Li X, Piemonte RC, Cooksey TJ, Singh A, Robertson ML, Madsen LA. Tuning Biocompatible Block Copolymer Micelles by Varying Solvent Composition: Dynamics and Populations of Micelles and Unimers. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02579] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Bryce E. Kidd
- Department
of Chemistry and Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Xiuli Li
- Department
of Chemistry and Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Rachele C. Piemonte
- Department
of Chemistry and Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Tyler J. Cooksey
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77004, United States
| | - Avantika Singh
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77004, United States
| | - Megan L. Robertson
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77004, United States
| | - Louis A. Madsen
- Department
of Chemistry and Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
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3
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Cooksey TJ, Singh A, Le KM, Wang S, Kelley EG, He L, Vajjala Kesava S, Gomez ED, Kidd BE, Madsen LA, Robertson ML. Tuning Biocompatible Block Copolymer Micelles by Varying Solvent Composition: Core/Corona Structure and Solvent Uptake. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02580] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Tyler J. Cooksey
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Avantika Singh
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Kim Mai Le
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Shu Wang
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
| | - Elizabeth G. Kelley
- Department
of Chemical Engineering, University of Delaware, Newark, Delaware 19716, United States
- National
Institute
of Standards and Technology Center for Neutron Research, Gaithersburg, Maryland 20899-6100, United States
| | - Lilin He
- Biology
and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, United States
| | - Sameer Vajjala Kesava
- Department
of Chemical Engineering and the Materials Research Institute, The Pennsylvania State University, State College, Pennsylvania 16801, United States
| | - Enrique D. Gomez
- Department
of Chemical Engineering and the Materials Research Institute, The Pennsylvania State University, State College, Pennsylvania 16801, United States
| | - Bryce E. Kidd
- Department
of Chemistry and Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Louis A. Madsen
- Department
of Chemistry and Macromolecules Innovation Institute, Virginia Tech, Blacksburg, Virginia 24061, United States
| | - Megan L. Robertson
- Department
of Chemical and Biomolecular Engineering, University of Houston, Houston, Texas 77204-4004, United States
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4
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Xie M, Wang S, Singh A, Cooksey TJ, Marquez MD, Bhattarai A, Kourentzi K, Robertson ML. Fluorophore exchange kinetics in block copolymer micelles with varying solvent-fluorophore and solvent-polymer interactions. SOFT MATTER 2016; 12:6196-205. [PMID: 27383924 PMCID: PMC4973472 DOI: 10.1039/c6sm00297h] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Fluorescence spectroscopy was employed to characterize the kinetics of guest exchange in diblock copolymer micelles composed of poly(ethylene oxide-b-ε-caprolactone) (PEO-PCL) diblock copolymers in water/tetrahydrofuran (THF) mixtures which encapsulated fluorophores. The solvent composition (THF content) of the micelle solution was varied as a means of modulating the strength of interactions between the fluorophore and solvent as well as between the micelle core and solvent. A donor-acceptor fluorophore pair was employed consisting of 3,3'-dioctadecyloxacarbocyanine perchlorate (DiO, the donor) and 1,1'-dioctadecyl-3,3,3',3'-tetramethylindocarbocyanine perchlorate (DiI, the acceptor). Through the process of Förster resonance energy transfer (FRET), energy was transferred from the donor to acceptor when the fluorophores were in close proximity. A micelle solution containing DiO was mixed with a micelle solution containing DiI at t = 0, and the emission spectra of the mixed solution were monitored over time (at an excitation wavelength optimized for the donor). In micelle solutions containing 5 and 10 vol% THF in the bulk solvent, an increase in the acceptor peak intensity maximum occurred over time in the post-mixed solution, accompanied by a decrease in the donor peak intensity maximum, indicating the presence of energy transfer from the donor to the acceptor. At long times, the FRET ratios (acceptor peak intensity divided by the sum of the acceptor and donor peak intensities) were indistinguishable from that determined from pre-mixed micelle solutions of the same THF content (in pre-mixed solutions, DiO and DiI were encapsulated within the same micelle cores). In the micelle solution containing 20 vol% THF, the fluorophore exchange process occurred too quickly to be observed (the FRET ratios measured from the solutions mixed at t = 0 were commensurate to that measured from the pre-mixed solution). A time constant describing the guest exchange process was extracted from the time-dependence of the FRET ratio through fit of an exponential decay. An increase in the THF content in the micelle solution resulted in a decrease in the time constant, and the time constant varied over five orders of magnitude as the THF content was varied from 5-20 vol%.
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Affiliation(s)
- Michelle Xie
- Department of Chemical and Biomolecular Engineering, University of Houston, 4726 Calhoun Road, S222 Engineering Building 1, Houston, TX 77204-4004, USA.
| | - Shu Wang
- Department of Chemical and Biomolecular Engineering, University of Houston, 4726 Calhoun Road, S222 Engineering Building 1, Houston, TX 77204-4004, USA.
| | - Avantika Singh
- Department of Chemical and Biomolecular Engineering, University of Houston, 4726 Calhoun Road, S222 Engineering Building 1, Houston, TX 77204-4004, USA.
| | - Tyler J Cooksey
- Department of Chemical and Biomolecular Engineering, University of Houston, 4726 Calhoun Road, S222 Engineering Building 1, Houston, TX 77204-4004, USA.
| | - Maria D Marquez
- Department of Chemical and Biomolecular Engineering, University of Houston, 4726 Calhoun Road, S222 Engineering Building 1, Houston, TX 77204-4004, USA.
| | - Ashish Bhattarai
- Department of Chemical and Biomolecular Engineering, University of Houston, 4726 Calhoun Road, S222 Engineering Building 1, Houston, TX 77204-4004, USA.
| | - Katerina Kourentzi
- Department of Chemical and Biomolecular Engineering, University of Houston, 4726 Calhoun Road, S222 Engineering Building 1, Houston, TX 77204-4004, USA.
| | - Megan L Robertson
- Department of Chemical and Biomolecular Engineering, University of Houston, 4726 Calhoun Road, S222 Engineering Building 1, Houston, TX 77204-4004, USA.
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5
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Manova A, Viktorova J, Köhler J, Theiler S, Keul H, Piryazev AA, Ivanov DA, Tsarkova L, Möller M. Multilamellar Thermoresponsive Emulsions Stabilized with Biocompatible Semicrystalline Block Copolymers. ACS Macro Lett 2016; 5:163-167. [PMID: 35614692 DOI: 10.1021/acsmacrolett.5b00743] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We demonstrate specific interface-templated crystallization behavior of biocompatible amphiphilic poly(ethylene oxide)-b-poly(ε-caprolactone) (PEO-b-PCL) block copolymers enabling triggered shaping of the curvature of the oil/water interface and controlled phase inversion, including the formation of stable multiple emulsions. Water-born anisotropic micelles of PEO-b-PCL block copolymers self-assemble at the oil-water interface in a multilayer form and undergo conformational rearrangements into unique semicrystalline multilamellar shells, for which curvature (type of emulsion) can be tuned by the molecular architecture (volume fractions of the blocks) and/or by the temperature. The latter trigger affects both the solubility of the PEO block in water and the semicrystalline state of the PCL block. Remarkably, multilamellar semicrystalline shells provide both long-term stability and enhanced barrier properties of toluene-water emulsions, as well as the fast change of the bending, leading to thermo-induced phase inversion. These findings signify the development of novel practical mechanisms for controlled triggered encapsulation and release systems.
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Affiliation(s)
- Anna Manova
- DWI − Leibniz-Institut für Interaktive Materialien, 52056 Aachen, Germany
| | | | - Jens Köhler
- DWI − Leibniz-Institut für Interaktive Materialien, 52056 Aachen, Germany
| | | | - Helmut Keul
- DWI − Leibniz-Institut für Interaktive Materialien, 52056 Aachen, Germany
| | - Alexey A. Piryazev
- Faculty
of Fundamental Physical and Chemical Engineering, Moscow State University, Moscow, Russia
| | - Dimitri A. Ivanov
- Faculty
of Fundamental Physical and Chemical Engineering, Moscow State University, Moscow, Russia
- Institut de Sciences des Matériaux de Mulhouse, (IS2M), CNRS UMR 7361, F-68057 Mulhouse, France
| | | | - Martin Möller
- DWI − Leibniz-Institut für Interaktive Materialien, 52056 Aachen, Germany
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6
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Silva JM, Vandermeulen G, Oliveira VG, Pinto SN, Rodrigues C, Salgado A, Afonso CA, Viana AS, Jérôme C, Silva LC, Graca L, Préat V, Florindo HF. Development of functionalized nanoparticles for vaccine delivery to dendritic cells: a mechanistic approach. Nanomedicine (Lond) 2015; 9:2639-56. [PMID: 25529568 DOI: 10.2217/nnm.14.135] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
AIM Produce biodegradable nanoparticles to target antigen-presenting cells (APCs) and evaluate their potential to be used as a vaccine delivery system. MATERIALS & METHODS Untargeted PEGylated poly(d,l-lactic-co-glycolide)-based nanoparticles and mannose-grafted nanoparticles were formulated and physicochemically characterized. Immortalized and primary APCs were used to study nanoparticle internalization patterns. The endocytic pathways and intracellular trafficking followed by nanoparticles were also investigated. RESULTS & DISCUSSION Nanoparticles displayed mannose residues available for binding at the nanoparticle surface. Different nanoparticle internalization patterns by immortalized and primary APCs were verified. Macropinocytosis, clathrin-mediated endocytosis, caveolin- and lipid raft-dependent endocytosis are involved in nanoparticles internalization. Nanoparticles demonstrate both endolysosomal and cytosolic localizations and a tendency to accumulate nearby the endoplasmic reticulum. CONCLUSION The developed nanoparticles might drive antigens to be presented through MHC class I and II molecules to both CD8(+) and CD4(+) T cells, favoring a complete and coordinated immune response.
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Affiliation(s)
- Joana M Silva
- Faculdade de Farmácia, Universidade de Lisboa, Instituto de Investigação do Medicamento (iMed.ULisboa), Lisbon, Portugal
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7
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Vanslambrouck S, Clément B, Riva R, Koole LH, Molin DGM, Broze G, Lecomte P, Jérôme C. Synthesis and tensioactive properties of PEO-b-polyphosphate copolymers. RSC Adv 2015. [DOI: 10.1039/c5ra02205c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Investigation of the micellization of degradable polyphosphoester based surfactants following a solvent-free process: the role of the pendent chain.
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Affiliation(s)
- S. Vanslambrouck
- Center for Education and Research on Macromolecules
- University of Liege
- Chemistry Department
- B-4000 Liege
- Belgium
| | - B. Clément
- Center for Education and Research on Macromolecules
- University of Liege
- Chemistry Department
- B-4000 Liege
- Belgium
| | - R. Riva
- Center for Education and Research on Macromolecules
- University of Liege
- Chemistry Department
- B-4000 Liege
- Belgium
| | - L. H. Koole
- Faculty of Health
- Medicine and Life Science
- Department of Biomedical Engineering/Biomaterials Sciences
- Maastricht University
- Maastricht
| | - D. G. M. Molin
- BioMIMedics
- Interred EMR IV-A Consortium: Lead Partner Maastricht University
- 6229ER Maastricht
- The Netherlands
| | - G. Broze
- Center for Education and Research on Macromolecules
- University of Liege
- Chemistry Department
- B-4000 Liege
- Belgium
| | - P. Lecomte
- Center for Education and Research on Macromolecules
- University of Liege
- Chemistry Department
- B-4000 Liege
- Belgium
| | - C. Jérôme
- Center for Education and Research on Macromolecules
- University of Liege
- Chemistry Department
- B-4000 Liege
- Belgium
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8
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Silva JM, Zupancic E, Vandermeulen G, Oliveira VG, Salgado A, Videira M, Gaspar M, Graca L, Préat V, Florindo HF. In vivo delivery of peptides and Toll-like receptor ligands by mannose-functionalized polymeric nanoparticles induces prophylactic and therapeutic anti-tumor immune responses in a melanoma model. J Control Release 2014; 198:91-103. [PMID: 25483429 DOI: 10.1016/j.jconrel.2014.11.033] [Citation(s) in RCA: 103] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 11/24/2014] [Accepted: 11/26/2014] [Indexed: 10/24/2022]
Abstract
We hypothesized that the co-entrapment of melanoma-associated antigens and the Toll-like receptor (TLR) ligands Poly(I:C) and CpG, known to be Th1-immunopotentiators, in mannose-functionalized aliphatic polyester-based nanoparticles (NPs) could be targeted to mannose receptors on antigen-presenting cells and induce anti-tumor immune responses. High entrapment efficiencies of antigens and immunopotentiators in 150nm NPs were obtained. The co-entrapment of the model antigen ovalbumin and the TLR ligands was crucial to induce high IgG2c/IgG1 ratios and high levels of IFN-γ and IL-2. Mannose-functionalization of NPs potentiated the Th1 immune response. The nanoparticulate vaccines decreased the growth rate of murine B16F10 melanoma tumors in therapeutic and prophylatic settings. The combination of mannose-functionalized NPs containing MHC class I- or class II-restricted melanoma antigens and the TLR ligands induced the highest tumor growth delay. Overall, we demonstrate that the multifunctional properties of NPs in terms of targeting and antigen/adjuvant delivery have high cancer immunotherapeutic potential.
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Affiliation(s)
- Joana M Silva
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003 Lisbon, Portugal; Louvain Drug Research Institute, Advanced Drug Delivery & Biomaterials, Université Catholique de Louvain, 1200 Brussels, Belgium
| | - Eva Zupancic
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003 Lisbon, Portugal
| | - Gaëlle Vandermeulen
- Louvain Drug Research Institute, Advanced Drug Delivery & Biomaterials, Université Catholique de Louvain, 1200 Brussels, Belgium
| | - Vanessa G Oliveira
- Instituto de Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa, 1649-025 Lisbon, Portugal
| | - Ana Salgado
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003 Lisbon, Portugal
| | - Mafalda Videira
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003 Lisbon, Portugal
| | - Manuela Gaspar
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003 Lisbon, Portugal
| | - Luis Graca
- Instituto de Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa, 1649-025 Lisbon, Portugal
| | - Véronique Préat
- Louvain Drug Research Institute, Advanced Drug Delivery & Biomaterials, Université Catholique de Louvain, 1200 Brussels, Belgium.
| | - Helena F Florindo
- Instituto de Investigação do Medicamento (iMed.ULisboa), Faculdade de Farmácia, Universidade de Lisboa, 1649-003 Lisbon, Portugal.
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9
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Rizis G, van de Ven TGM, Eisenberg A. Crystallinity-driven morphological ripening processes for poly(ethylene oxide)-block-polycaprolactone micelles in water. SOFT MATTER 2014; 10:2825-2835. [PMID: 24668142 DOI: 10.1039/c3sm52950a] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A set of morphological transformations induced by core crystallization within spherical micelle-like aggregates of poly(ethylene oxide)-block-polycaprolactone (PEO-b-PCL) is described in the present article. The initial self-assembly step, in which individual copolymer chains associate to form the spheres, can be performed reproducibly; the stability of these spheres, however, seems to be limited, as both transmission electron microscopy and light scattering data suggest that the primary spheres transform slowly into elongated rod-like or ribbon-like aggregates when suspended in deionized water at room temperature. Although the sphere-to-rod transition takes place typically over a time scale of several days, the formation of individual rods from spheres is very rapid, as evidenced by the progressive increase in the number of long rods and the conspicuous absence of short rods.
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Affiliation(s)
- Georgios Rizis
- Department of Chemistry and Centre for Self-Assembled Chemical Structures (CSACS), McGill University, 801 Sherbrooke Street West, H3A 2K6, Montreal, Canada.
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10
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Petersen MA, Hillmyer MA, Kokkoli E. Bioresorbable polymersomes for targeted delivery of cisplatin. Bioconjug Chem 2013; 24:533-43. [PMID: 23521104 DOI: 10.1021/bc3003259] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nontoxic bioresorbable polymersomes have been developed that efficiently and site-selectively tether targeting peptides under mild conditions with no toxic catalysts. The binding and release properties of these polymersomes have been evaluated when targeting DLD-1 human colon cancer cells overexpressing the α(5)β(1) integrin. The delivery efficacy to these cells is markedly improved over commonly used RGD targeting peptides by use of an α(5)β(1)-specific targeting peptide, PR_b. Release profiles in buffered solution from pH 7.4 to 4.5 were evaluated and compared to release after binding to cells, and enzymatic degradation was identified as a major cause of rapid payload release in the cell. Intracellular trafficking and release were imaged via confocal microscopy in live cells and colocalization with organelles was evaluated quantitatively over time. Finally, the anticancer drug cisplatin was encapsulated in the PR_b functionalized polymersomes and the presence of PR_b greatly improved delivery efficacy, with increased cisplatin-induced losses to targeted DLD-1 colon cancer cell viability. When delivered to CACO-2 model human epithelial cells expressing low levels of α(5)β(1) integrin, low toxicity was maintained, suggesting that targeting was specific to α(5)β(1) overexpressing cells. These results demonstrate that PR_b-functionalized bioresorbable polymersomes may be an attractive route to minimizing the dose-limiting side effects associated with existing approaches to cisplatin chemotherapy.
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Affiliation(s)
- Matthew A Petersen
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455, USA
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11
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Zhou D, Zhang G, Gan Z. c(RGDfK) decorated micellar drug delivery system for intravesical instilled chemotherapy of superficial bladder cancer. J Control Release 2013; 169:204-10. [PMID: 23388072 DOI: 10.1016/j.jconrel.2013.01.025] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2012] [Revised: 12/25/2012] [Accepted: 01/18/2013] [Indexed: 01/17/2023]
Abstract
The aim of this work was to develop a targeted drug delivery system with potentials for intravesical instilled chemotherapy of superficial bladder cancer. The amphiphilic diblock copolymer poly(ε-caprolactone)-b-poly(ethylene oxide) (PCL-b-PEO) was first conjugated with the cyclic (Arginine-Glycine-Aspartic acid-d-Phenylalanine-Lysine) (c(RGDfK)) and fluorescein isothiocyannate (FITC) via the functional terminal groups of hydrophilic block, and then assembled into micelles. The interaction between micelles and various model cells was well studied by means of confocal laser scanning microscopy and flow cytometry. The c(RGDfK) on the surface of the micelle was confirmed by (1)H NMR analysis and cell affinity with human glioblastoma-astrocytoma cells (U87MG). The cell viability of bladder cancer cells (T-24 cells) after incubation with doxorubicin (DOX) loaded polymeric micelles was evaluated by in vitro cytotoxicity assay. The results revealed that c(RGDfK) modified micelles showed strong affinity to T-24 cells and strong inhibitory effect on the proliferation of T-24 cells when doxorubicin drug was loaded, indicating the high affinity of c(RGDfK) to bladder cancer cells. The c(RGDfK) modified micelles assembled from PCL-b-PEO diblock copolymers developed in this study are of great potentials as nano-scaled drug delivery system for intravesical instilled chemotherapy of superficial bladder cancer.
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Affiliation(s)
- Danhua Zhou
- CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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12
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Drug delivery to inflamed colon by nanoparticles: comparison of different strategies. Int J Pharm 2012; 440:3-12. [PMID: 22820482 DOI: 10.1016/j.ijpharm.2012.07.017] [Citation(s) in RCA: 123] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2012] [Revised: 07/10/2012] [Accepted: 07/11/2012] [Indexed: 12/12/2022]
Abstract
For inflammatory bowel disease (IBD) treatment, local delivery of molecules loaded in nanoparticles to the inflamed colon could be a promising strategy. The aim of this study was to investigate how drug-loaded polymeric nanoparticles target the site of inflammation and to analyse the influence of different colon-specific delivery strategies. Three different polymeric nanoparticles were formulated using ovalbumin (OVA) as a model drug. pH-sensitive nanoparticles were made with Eudragit(®) S100. Mucoadhesive nanoparticles were created with trimethylchitosan (TMC). A mix of polymers, PLGA, PEG-PLGA and PEG-PCL, were used to obtain a sustained drug delivery. Furthermore, ligands targeting immune cells (i.e. mannose) or the inflamed colon (i.e. a specific peptide) were grafted on the PEG chain of PCL. Interaction of nanoparticles with the intestinal epithelium was explored using Caco-2 monolayers designed to mimic an inflamed epithelium and then visualized using confocal laser microscopy. TMC nanoparticles had the highest apparent permeability for OVA in the untreated model. However, in the inflamed model, there were no difference between TMC, PLGA-based and Eudragit(®) nanoparticles. The uptake of nanoparticles in the inflamed mouse colon was assessed in a horizontal diffusion chamber. Mannose-grafted PLGA nanoparticles showed the highest accumulation of OVA in inflamed colon. Based on these results, active targeting of macrophages and dendritic cells may be a promising approach for targeting the colon in IBD.
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13
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Zhang X, Xiao Y, Lang M. Synthesis and Self-Assembly Behaviors of Four-Arm Star Block Copolymers Poly(ϵ-caprolactone)-b-poly(2- (diethylamino) ethyl methacrylate)) in Aqueous Solution. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2012. [DOI: 10.1080/10601325.2012.641907] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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14
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Talom RM, Fuks G, Kaps L, Oberdisse J, Cerclier C, Gaillard C, Mingotaud C, Gauffre F. DNA-polymer micelles as nanoparticles with recognition ability. Chemistry 2011; 17:13495-501. [PMID: 22025327 DOI: 10.1002/chem.201101561] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2011] [Revised: 07/25/2011] [Indexed: 01/01/2023]
Abstract
The Watson-Crick binding of DNA single strands is a powerful tool for the assembly of nanostructures. Our objective is to develop polymer nanoparticles equipped with DNA strands for surface-patterning applications, taking advantage of the DNA technology, in particular, recognition and reversibility. A hybrid DNA copolymer is synthesized through the conjugation of a ssDNA (22-mer) with a poly(ethylene oxide)-poly(caprolactone) diblock copolymer (PEO-b-PCl). It is shown that, in water, the PEO-b-PCl-ssDNA(22) polymer forms micelles with a PCl hydrophobic core and a hydrophilic corona made of PEO and DNA. The micelles are thoroughly characterized using electron microscopy (TEM and cryoTEM) and small-angle neutron scattering. The binding of these DNA micelles to a surface through DNA recognition is monitored using a quartz crystal microbalance and imaged by atomic force microscopy. The micelles can be released from the surface by a competitive displacement event.
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Affiliation(s)
- Renée Mayap Talom
- Université de Toulouse, CNRS, Laboratoire des IMRCP, UMR 5623, 118 route de Narbonne, 31062 Toulouse Cedex 9, France
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15
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El Fagui A, Dalmas F, Lorthioir C, Wintgens V, Volet G, Amiel C. Well-defined core-shell nanoparticles containing cyclodextrin in the shell: A comprehensive study. POLYMER 2011. [DOI: 10.1016/j.polymer.2011.06.043] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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16
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Braun J, Bruns N, Pfohl T, Meier W. Phase Behavior of Vesicle-Forming Block Copolymers in Aqueous Solutions. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201100012] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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17
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Nazemi A, Amos RC, Bonduelle CV, Gillies ER. Dendritic surface functionalization of biodegradable polymer assemblies. ACTA ACUST UNITED AC 2011. [DOI: 10.1002/pola.24686] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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18
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Matter Y, Enea R, Casse O, Lee CC, Baryza J, Meier W. Amphiphilic PEG-b-
PMCL-b-
PDMAEMA Triblock Copolymers: From Synthesis to Physico-Chemistry of Self-Assembled Structures. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201000661] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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19
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Liu GY, Lv LP, Chen CJ, Hu XF, Ji J. Biocompatible Poly(D
,L
-lactide)-block-
Poly(2-methacryloyloxyethylphosphorylcholine) Micelles for Drug Delivery. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201000735] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Liu G, Hu X, Chen C, Jin Q, Ji J. Self-assembly and degradation of poly[(2-methacryloyloxyethyl phosphorylcholine)-
block
-(D
,L
-lactide)] diblock copolymers: large compound micelles to vesicles. POLYM INT 2010. [DOI: 10.1002/pi.2981] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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21
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Raynaud J, Absalon C, Gnanou Y, Taton D. N-heterocyclic carbene-induced zwitterionic ring-opening polymerization of ethylene oxide and direct synthesis of alpha,omega-difunctionalized poly(ethylene oxide)s and poly(ethylene oxide)-b-poly(epsilon-caprolactone) block copolymers. J Am Chem Soc 2010; 131:3201-9. [PMID: 19209910 DOI: 10.1021/ja809246f] [Citation(s) in RCA: 145] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An N-heterocyclic carbene (NHC), namely, 1,3-bis-(diisopropyl)imidazol-2-ylidene (1), was demonstrated to bring about the metal-free ring-opening polymerization of ethylene oxide at 50 degrees C in dimethyl sulfoxide, in absence of any other reagents. Poly(ethylene oxide) (PEO) of polydispersities <1.2 and molar masses perfectly matching the [monomer]/[(1)] ratio could thus be obtained in quantitative yields, attesting to the controlled/living character of such carbene-initiated polymerizations. It is argued that (1) adds to ethylene oxide to form a zwitterionic species, namely 1,3-bis-(diisopropyl)imidazol-2-ylidinium alkoxide, that further propagates by a zwitterionic ring-opening polymerization (ZROP) mechanism. Through an appropriate choice of terminating agent NuH or NuSiMe(3) at the completion of the polymerization, a variety of end-functionalized PEO chains could be generated. In particular, alpha,omega-bis(hydroxy)-telechelic PEO, alpha-benzyl,omega-hydroxy, and alpha-azido,omega-hydroxy-difunctionalized PEOs were synthesized by NHC (1)-initiated ZROP, using H(2)O, PhCH(2)OH, and N(3)SiMe(3) as terminating agent, respectively. Characterization of these alpha,omega-difunctionalized PEOs by techniques such as (1)H NMR spectroscopy, MALDI-TOF spectrometry, and size exclusion chromatography confirmed the quantitative introduction of functional groups at both alpha and omega positions of the PEO chains and the formation of very narrow molar mass polymers. Finally, the synthesis of a poly(ethylene oxide)-b-poly(epsilon-caprolactone) diblock copolymer by sequential ZROP of the corresponding monomers was successfully achieved using (1) as organic initiator without isolation of the PEO block intermediate.
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Affiliation(s)
- Jean Raynaud
- Laboratoire de Chimie des Polymères Organiques (LCPO) - ENSCPB - CNRS, Université Bordeaux, 16 Av. Pey Berland, 330607 Pessac Cedex 9, France
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22
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Xiong XB, Uludağ H, Lavasanifar A. Virus-mimetic polymeric micelles for targeted siRNA delivery. Biomaterials 2010; 31:5886-93. [PMID: 20427082 DOI: 10.1016/j.biomaterials.2010.03.075] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2010] [Accepted: 03/30/2010] [Indexed: 12/20/2022]
Abstract
In this study, an engineered non-viral polymer based delivery systems with structural features mimicking that of viral vectors was developed and the potential of this carrier for siRNA delivery was assessed. The developed siRNA carrier was based on poly(ethylene oxide)-block-poly(epsilon-caprolactone) (PEO-b-PCL) micelles decorated with integrin alphavbeta3 targeting peptide (RGD4C) and/or cell penetrating peptide (TAT) on the PEO shell, and modified with a polycation (spermine) in the PCL core for siRNA binding and protection. We observed increased cellular uptake and effective endosomal escape of siRNA delivered with the peptide-functionalized micelles especially those with dual functionality (RGD/TAT-micelles) compared to unmodified micelles (NON-micelles) in MDA435/LCC6 resistant cells. Transfection of mdr1 siRNA formulated in peptide-modified micelles led to P-gp down regulation both at the mRNA and protein level. Subsequent to P-gp down regulation, increased cellular accumulation of P-gp substrate, doxorubicin (DOX), in the cytoplasm and nucleus of resistant MDA435/LCC6 cells after treatment with peptide decorated polymeric micelle/mdr1 siRNA complexes was observed. As a result, resistance to DOX was successfully reversed. Interestingly, RGD/TAT-micellar siRNA complexes produced improved cellular uptake, P-gp silencing, DOX cellular accumulation, DOX nuclear localization and DOX induced cytotoxicity in MDA435/LCC6 cells when compared to micelles decorated with individual peptides. Results of this study indicated a potential for RGD/TAT-functionalized virus-like micelles as promising carriers for efficient delivery of mdr1 siRNA to MDA435/LCC6 resistant cells as means to reverse the P-gp mediated multidrug resistance to DOX.
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Affiliation(s)
- Xiao-Bing Xiong
- Faculty of Pharmacy and Pharmaceutical Sciences, University of Alberta, Edmonton, AB T6G 2N8, Canada
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23
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Kandadai MA, Mohan P, Lin G, Butterfield A, Skliar M, Magda JJ. Comparison of surfactants used to prepare aqueous perfluoropentane emulsions for pharmaceutical applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:4655-60. [PMID: 20218695 PMCID: PMC2866627 DOI: 10.1021/la100307r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Perfluoropentane (PFP), a very hydrophobic, nontoxic, noncarcinogenic fluoroalkane, has generated much interest in biomedical applications, including occlusion therapy and controlled drug delivery. For most of these applications, the dispersion within aqueous media of a large quantity of PFP droplets of the proper size is critically important. Surprisingly, the interfacial tension of PFP against water in the presence of surfactants used to stabilize the emulsion has rarely, if ever, been measured. In this study, we report the interfacial tension of PFP in the presence of surfactants used in previous studies to produce emulsions for biomedical applications: polyethylene oxide-co-polylactic acid (PEO-PLA) and polyethylene oxide-co-poly-epsilon-caprolactone (PEO-PCL). Because both of these surfactants are uncharged diblock copolymers that rely on the mechanism of steric stabilization, we also investigate for comparison's sake the use of the small-molecule cationic surfactant cetyl trimethyl ammonium bromide (CTAB) and the much larger protein surfactant bovine serum albumin (BSA). The results presented here complement previous reports of the PFP droplet size distribution and will be useful for determining to what extent the interfacial tension value can be used to control the mean PFP droplet size.
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Affiliation(s)
- Madhuvanthi A Kandadai
- Department of Chemical Engineering, University of Utah, Salt Lake City, Utah 84112, USA.
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24
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Zhang W, He J, Liu Z, Ni P, Zhu X. Biocompatible and pH-responsive triblock copolymer mPEG-b
-PCL-b
-PDMAEMA: Synthesis, self-assembly, and application. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.23863] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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25
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Petersen MA, Yin L, Kokkoli E, Hillmyer MA. Synthesis and characterization of reactive PEO–PMCL polymersomes. Polym Chem 2010. [DOI: 10.1039/c0py00143k] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Cooper BM, Emrick T. Sequential and localized grafting on aliphatic polyester diblock copolymers using alkyne deprotection and click cycloaddition. ACTA ACUST UNITED AC 2009. [DOI: 10.1002/pola.23745] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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27
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Denkova PS, Van Lokeren L, Willem R. Mixed micelles of Triton X-100, sodium dodecyl dioxyethylene sulfate, and synperonic l61 investigated by NOESY and diffusion ordered NMR spectroscopy. J Phys Chem B 2009; 113:6703-9. [PMID: 19385612 DOI: 10.1021/jp8104369] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Mixed micelles formed from nonionic surfactant Triton X-100 (TX100), anionic surfactant sodium dodecyl dioxyethylene sulfate (SDP2S), and triblock copolymer Synperonic L61 (SL61) were investigated by 1H NMR spectroscopy. The size and shape of the aggregates were determined by diffusion ordered NMR spectroscopy (DOSY), while 2D nuclear Overhauser enhanced spectroscopy (NOESY) NMR was used to study the mutual spatial arrangement of the surfactant molecules in the aggregated state. An average micellar hydrodynamic radius of 3.6 nm, slightly increasing upon increasing TX100 molar fraction, was found for the mixed systems without additives. Addition of SL61 to the mixed micellar systems results in a slight increase of micellar radii. In the presence of AlCl3, an increase of TX100/SDP2S micellar sizes from 4 to 10 nm was found when increasing the SDP2S molar fraction. The mixed TX100/SDP2S micelles in the presence of both AlCl3 and polymer SL61 are almost spherical, with a radius of 4.5 nm. 2D NOESY data reveal that, as the individual TX100 micelles, mixed TX100/SDP2S and TX100/SDP2S/SL61/AlCl3 micelles also have a multilayer structure, with partially overlapping internal and external layers of TX100 molecules. In these mixed micelles, the SDP2S molecules are located at the level of the external layer of TX100 molecules, whereas the SL61 polymer is partially incorporated inside of the micellar core.
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Affiliation(s)
- Pavletta S Denkova
- Vrije Universiteit Brussel, High Resolution NMR Centre (HNMR), Department of Materials and Chemistry (MACH), Pleinlaan 2, B-1050 Brussels, Belgium.
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28
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Štěpánek M, Uchman M, Procházka K. Self-assemblies formed by four-arm star copolymers with amphiphilic diblock arms in aqueous solutions. POLYMER 2009. [DOI: 10.1016/j.polymer.2009.05.024] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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29
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Chen T, Hynninen AP, Prud'homme RK, Kevrekidis IG, Panagiotopoulos AZ. Coarse-grained simulations of rapid assembly kinetics for polystyrene-b-poly(ethylene oxide) copolymers in aqueous solutions. J Phys Chem B 2009; 112:16357-66. [PMID: 19367859 DOI: 10.1021/jp805826a] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We present a coarse-grained, implicit solvent model for polystyrene-b-poly(ethylene oxide) in aqueous solution and study its assembly kinetics using Brownian dynamics simulations. The polymer is modeled as a chain of freely jointed beads interacting through effective potentials. Coarse-grained force field parameters are determined by matching experimental thermodynamic quantities including radius of gyration, second virial coefficient, aggregation number, and critical micelle concentration. We investigate the influence of cooling rate (analogous to the rate of solvent quality change in rapid precipitations), polymer concentration, and friction coefficient on the assembly kinetics and compare simulation results to flash nanoprecipitation experiments. We find that assembly kinetics show a linear scaling relation with inverse friction coefficient when the friction coefficient is larger than 1. When the cooling time is less than the characteristic micellization time, stable kinetically arrested clusters are obtained; otherwise, close-to-equilibrium micelles are formed. The characteristic micellization time is estimated to be only 3-6 ms, in contrast to 30-40 ms previously determined in experiments. We suggest that previous experiments probed the formation of micellar clusters while simulations in this work studied the kinetics of a single micelle assembled from free polymer chains.
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Affiliation(s)
- Ting Chen
- Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544-5263, USA
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30
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Giacomelli FC, Riegel IC, Petzhold CL, da Silveira NP, Stĕpánek P. Internal structural characterization of triblock copolymer micelles with looped corona chains. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:3487-3493. [PMID: 19708143 DOI: 10.1021/la804254k] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report the characterization through SAXS measurements of micelles produced from a new series of block copolymers: one diblock and four triblock copolymers bearing short poly[5-(N,N-diethylamino)isoprene] and long polystyrene blocks. Micellar aggregates produced in DMF (selective solvent for polystyrene) from the same set of samples were previously successfully characterized through light scattering measurements. The X-ray scattering profiles of starlike (from the diblock copolymer sample) and flowerlike micelles (from the triblock copolymers samples) could be fitted using the spherical copolymer micelle model proposed by Pedersen and Gerstenberg (Macromolecules 1996, 29, 1363.) where in the case of flowerlike micelles, the particles were understood as formed by hypothetical diblock copolymers having half of the true polymeric molar mass. Using the spherical copolymer micelle model, it could be possible to attest the unswollen nature of the micellar cores. The total micellar size suggested thus that the chains forming the corona are extended which is mainly related to a small core surface area per corona chain entering the core (Ac/n), which also induced a small number of aggregation (N(agg)) of all self-assembled particles. The total micellar size fits well with our previous light scattering measurements.
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Affiliation(s)
- Fernando C Giacomelli
- Institute of Chemistry, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970 Porto Alegre, Brazil
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31
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Van Butsele K, Fustin CA, Gohy JF, Jérôme R, Jérôme C. Self-Assembly and pH-Responsiveness of ABC Miktoarm Star Terpolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:107-111. [PMID: 19209424 DOI: 10.1021/la802469c] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This work deals with the self-assembly in water of ABC miktoarm star terpolymers consisting of hydrophobic poly(-caprolactone), hydrophilic poly(ethylene oxide) (PEO), and pH-sensitive poly(2-vinylpyridine) (P2VP). A variety of experimental techniques were used, including dynamic light scattering, transmission electron microscopy, and zeta potential. Special attention was paid to the pH dependency of the supramolecular self-assemblies. A key observation is the capability of the miktoarm terpolymers to form micelles stable over the whole range of pH, although a transition was observed from neutral to highly positively charged nanoobjects upon decreasing pH.
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Affiliation(s)
- K Van Butsele
- Center for Education and Research on Macromolecules, UniVersité de Liège, B6 Sart-Tilman,B-4000 Liege, Belgium
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32
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Synthesis and pH-dependent micellization of diblock copolymer mixtures. J Colloid Interface Sci 2009; 329:235-43. [DOI: 10.1016/j.jcis.2008.09.080] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2008] [Accepted: 09/28/2008] [Indexed: 11/21/2022]
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33
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Diblock copolymers of ethylene oxide and 1,2-butylene oxide in aqueous solution. Int J Pharm 2008; 362:193-6. [DOI: 10.1016/j.ijpharm.2008.06.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2008] [Revised: 06/02/2008] [Accepted: 06/04/2008] [Indexed: 11/20/2022]
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34
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Gindy ME, Ji S, Hoye TR, Panagiotopoulos AZ, Prud’homme RK. Preparation of Poly(ethylene glycol) Protected Nanoparticles with Variable Bioconjugate Ligand Density. Biomacromolecules 2008; 9:2705-11. [DOI: 10.1021/bm8002013] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marian E. Gindy
- Department of Chemical Engineering and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
| | - Shengxiang Ji
- Department of Chemical Engineering and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
| | - Thomas R. Hoye
- Department of Chemical Engineering and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
| | - Athanassios Z. Panagiotopoulos
- Department of Chemical Engineering and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
| | - Robert K. Prud’homme
- Department of Chemical Engineering and Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, and Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455
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35
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Fairley N, Hoang B, Allen C. Morphological control of poly(ethylene glycol)-block-poly(epsilon-caprolactone) copolymer aggregates in aqueous solution. Biomacromolecules 2008; 9:2283-91. [PMID: 18702541 DOI: 10.1021/bm800572p] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In aqueous solution, it was found that the amphiphilic copolymer poly(ethylene glycol)-b-poly(caprolactone) (PEG(5000)-b-PCL(4100)) formed different morphologies, including long rod-like, short rod-like, or spherical aggregates, when the copolymer concentration was increased. Nearly identical morphologies were observed with the addition of increasing amounts of PEG(2000)-distearoylphosphoethanolamine (PEG(2000)-DSPE) to the copolymer. The morphologies of the aggregates in solution were confirmed by negative stain transmission electron microscopy (TEM) and cryogenic-TEM (cryo-TEM). The critical micelle concentrations of the PEG(5000)-b-PCL(4100) copolymer, PEG(2000)-DSPE and a mixture of the two materials (PEG(5000)-b-PCL 4100/PEG(2000)-DSPE) were evaluated to determine the thermodynamic stability of the aggregates. Differential scanning calorimetry was performed to gain insight into the degree of mixing of PEG(5000)-b-PCL(4100) and PEG(2000)-DSPE. Overall, combining PEG(5000)-b-PCL(4100) and PEG(2000)-DSPE produced a single population of mixed micelles with rod-like or spherical morphologies depending on the material composition and concentration.
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Affiliation(s)
- Nichole Fairley
- Department of Pharmaceutical Sciences, Leslie Dan Faculty of Pharmacy, and Department of Chemistry, Faculty of Arts and Science, University of Toronto, 144 College Street, Toronto, Ontario, Canada
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36
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Dai XH, Dong CM. Synthesis, self-assembly and recognition properties of biomimetic star-shaped poly(ε-caprolactone)-b-glycopolymer block copolymers. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/pola.22426] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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37
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Amphiphilic polymer brushes with alternating PCL and PEO grafts through radical copolymerization of styrenic and maleimidic macromonomers. POLYMER 2008. [DOI: 10.1016/j.polymer.2007.11.037] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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38
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Lu C, Liu L, Guo SR, Zhang Y, Li Z, Gu J. Micellization and gelation of aqueous solutions of star-shaped PEG–PCL block copolymers consisting of branched 4-arm poly(ethylene glycol) and polycaprolactone blocks. Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2007.02.039] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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39
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Synthesis and characterization of amphiphilic block copolymers from poly(ethylene glycol)methyl ether and 4-methyl-ɛ-caprolactone or 4-phenyl-ɛ-caprolactone. POLYMER 2007. [DOI: 10.1016/j.polymer.2007.03.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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40
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Sachl R, Uchman M, Matĕjícek P, Procházka K, Stĕpánek M, Spírková M. Preparation and characterization of self-assembled nanoparticles formed by poly(ethylene oxide)-block-poly(epsilon-caprolactone) copolymers with long poly(epsilon-caprolactone) blocks in aqueous solutions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:3395-400. [PMID: 17269809 DOI: 10.1021/la063014c] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Aqueous solutions of self-assembled nanoparticles formed by biocompatible diblock copolymers of poly(epsilon-caprolactone)-block-poly(ethylene oxide) (PCL-PEO) with the same molar mass of the PEO block (5000 g mol-1) and three different molar masses of the PCL block (5000, 13 000, and 32 000 g mol-1) have been prepared by a fast mixing the copolymer solution in a mild selective solvent, tetrahydrofuran (THF)/water, with an excess of water, that is, by quenching the reversible micellization equilibrium, and a subsequent removal of THF by dialysis of the water-rich solution against water. The prepared nanoparticles have been characterized by static and dynamic light scattering and atomic force microscopy imaging. It was found that stable monodisperse nanoparticles are formed only if the initial mixed solvent contained 90 vol % THF. The results show that the prepared nanoparticles are spherical vesicles with relatively thick hydrophobic walls, that is, spherical core/shell nanoparticles with the hollow core filled with the solvent.
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Affiliation(s)
- Radek Sachl
- Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University in Prague, Albertov 2030, 128 40 Prague 2, Czech Republic
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41
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Chatterjee U, Jewrajka SK, Mandal BM. The amphiphilic block copolymers of 2-(dimethylamino)ethyl methacrylate and methyl methacrylate: Synthesis by atom transfer radical polymerization and solution properties. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.09.045] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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42
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Vangeyte P, Leyh B, De Clercq C, Auvray L, Misselyn-Bauduin AM, Jérôme R. Concomitant adsorption of poly(ethylene oxide)-b-poly(epsilon-caprolactone) copolymers and sodium dodecyl sulfate at the silica-water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:7710-6. [PMID: 16089373 DOI: 10.1021/la047051k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Upon addition of silica to aqueous solutions of poly(ethylene oxide)-b-poly(epsilon-caprolactone) copolymers (PEO-b-PCL) and sodium dodecyl sulfate (SDS), adsorption of the solutes occurs at the silica-water interface. The amount of the adsorbed constituents has been measured by the total concentration depletion method. Small-angle neutron scattering experiments (SANS) have been carried out to investigate the structure of the adsorbed layer. Although SDS is not spontaneously adsorbed onto hydrophilic silica, adsorption is observed in the presence of PEO-b-PCL diblocks, in relation to the relative concentration of the two compounds. Conversely, SDS has a depressive effect on the adsorption of the copolymer, whose structure at the interface is modified. Copolymer desorption is however never complete at high SDS content. These observations have been rationalized by the associative behavior of PEO-b-PCL and SDS in water.
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Affiliation(s)
- P Vangeyte
- Center for Education and Research on Macromolecules, University of Liège, Sart-Tilman B6a, B-4000 Liège, Belgium
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Vangeyte P, Leyh B, Rojas OJ, Claesson PM, Heinrich M, Auvray L, Willet N, Jérôme R. Adsorption of poly(ethylene oxide)-b-poly(epsilon-caprolactone) copolymers at the silica-water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:2930-2940. [PMID: 15779968 DOI: 10.1021/la047425+] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The adsorption of amphiphilic poly(ethylene oxide)-b-poly(epsilon-caprolactone) and poly(ethylene oxide)-b-poly(gamma-methyl-epsilon-caprolactone) copolymers in aqueous solution on silica and glass surfaces has been investigated by flow microcalorimetry, small-angle neutron scattering (SANS), surface forces, and complementary techniques. The studied copolymers consist of a poly(ethylene oxide) (PEO) block of M(n) = 5000 and a hydrophobic polyester block of poly(epsilon-caprolactone) (PCL) or poly(gamma-methyl-epsilon-caprolactone) (PMCL) of M(n) in the 950-2200 range. Compared to homoPEO, the adsorption of the copolymers is significantly increased by the connection of PEO to an aliphatic polyester block. According to calorimetric experiments, the copolymers interact with the surface mainly through the hydrophilic block. At low surface coverage, the PEO block interacts with the surface such that both PEO and PCL chains are exposed to the aqueous solution. At high surface coverage, a dense copolymer layer is observed with the PEO blocks oriented toward the solution. The structure of the copolymer layer has been analyzed by neutron scattering using the contrast matching technique and by tapping mode atomic force microscopy. The experimental observations agree with the coadsorption of micelles and free copolymer chains at the interface.
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Affiliation(s)
- P Vangeyte
- Center for Education and Research on Macromolecules (CERM), University of Liège, Sart-Tilman B6a, B-4000 Liège, Belgium
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Preparation of poly(ethylene oxide)-block-poly(isoprene) by nitroxide-mediated free radical polymerization from PEO macroinitiators. ACTA ACUST UNITED AC 2005. [DOI: 10.1002/pola.20756] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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