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52
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Laredj-Bourezg F, Bolzinger MA, Pelletier J, Valour JP, Rovère MR, Smatti B, Chevalier Y. Skin delivery by block copolymer nanoparticles (block copolymer micelles). Int J Pharm 2015; 496:1034-46. [DOI: 10.1016/j.ijpharm.2015.11.031] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Revised: 11/12/2015] [Accepted: 11/14/2015] [Indexed: 11/29/2022]
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53
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Floyd JA, Galperin A, Ratner BD. Drug encapsulated aerosolized microspheres as a biodegradable, intelligent glioma therapy. J Biomed Mater Res A 2015; 104:544-52. [PMID: 26238392 DOI: 10.1002/jbm.a.35547] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 06/10/2015] [Accepted: 07/31/2015] [Indexed: 01/13/2023]
Abstract
The grim prognosis for patients diagnosed with malignant gliomas necessitates the development of new therapeutic strategies for localized and sustained drug delivery to combat tumor drug resistance and regrowth. Here we introduce drug encapsulated aerosolized microspheres as a biodegradable, intelligent glioma therapy (DREAM BIG therapy). DREAM BIG therapy is envisioned to deliver three chemotherapeutics, temporally staged over one year, via a bioadhesive, biodegradable spray directly to the brain surgical site after tumor excision. In this proof-of-principle article exploring key components of the DREAM BIG therapy prototype, rhodamine B (RB) encapsulated poly(lactic-co-glycolic acid) and immunoglobulin G (IgG) encapsulated poly(lactic acid) microspheres were formulated and characterized. The encapsulation efficiency of RB and IgG and the release kinetics of the model drugs from the microspheres were elucidated in addition to the release kinetics of RB from poly(lactic-co-glycolic acid) microspheres formulated in a degradable poly(N-isopropylacrylamide) solution. The successful aerosolized application onto brain tissue ex-vivo demonstrated the conformal adhesion of the RB encapsulated poly(lactic-co-glycolic acid) microspheres to the convoluted brain surface mediated by the thermoresponsive carrier, poly(N-isopropylacrylamide). These preliminary results suggest the potential of the DREAM BIG therapy for future use with multiple chemotherapeutics and microsphere types to combat gliomas at a localized site.
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Affiliation(s)
- J Alaina Floyd
- Department of Chemical Engineering, University of Washington, Seattle
| | - Anna Galperin
- Department of Bioengineering, University of Washington, Seattle
| | - Buddy D Ratner
- Department of Chemical Engineering, University of Washington, Seattle.,Department of Bioengineering, University of Washington, Seattle
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54
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Mosiewicki MA, Aranguren MI. Recent developments in plant oil based functional materials. POLYM INT 2015. [DOI: 10.1002/pi.5033] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Mirna A Mosiewicki
- Institute of Research in Materials Science and Technology (INTEMA) and Facultad de Ingeniería; Universidad Nacional de Mar del Plata − National Scientific and Technical Research Council (CONICET); Argentina
| | - Mirta I Aranguren
- Institute of Research in Materials Science and Technology (INTEMA) and Facultad de Ingeniería; Universidad Nacional de Mar del Plata − National Scientific and Technical Research Council (CONICET); Argentina
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55
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Keles H, Naylor A, Clegg F, Sammon C. Investigation of factors influencing the hydrolytic degradation of single PLGA microparticles. Polym Degrad Stab 2015. [DOI: 10.1016/j.polymdegradstab.2015.04.025] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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56
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Ford Versypt AN, Arendt PD, Pack DW, Braatz RD. Derivation of an Analytical Solution to a Reaction-Diffusion Model for Autocatalytic Degradation and Erosion in Polymer Microspheres. PLoS One 2015; 10:e0135506. [PMID: 26284787 PMCID: PMC4540565 DOI: 10.1371/journal.pone.0135506] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 07/22/2015] [Indexed: 11/19/2022] Open
Abstract
A mathematical reaction-diffusion model is defined to describe the gradual decomposition of polymer microspheres composed of poly(D,L-lactic-co-glycolic acid) (PLGA) that are used for pharmaceutical drug delivery over extended periods of time. The partial differential equation (PDE) model treats simultaneous first-order generation due to chemical reaction and diffusion of reaction products in spherical geometry to capture the microsphere-size-dependent effects of autocatalysis on PLGA erosion that occurs when the microspheres are exposed to aqueous media such as biological fluids. The model is solved analytically for the concentration of the autocatalytic carboxylic acid end groups of the polymer chains that comprise the microspheres as a function of radial position and time. The analytical solution for the reaction and transport of the autocatalytic chemical species is useful for predicting the conditions under which drug release from PLGA microspheres transitions from diffusion-controlled to erosion-controlled release, for understanding the dynamic coupling between the PLGA degradation and erosion mechanisms, and for designing drug release particles. The model is the first to provide an analytical prediction for the dynamics and spatial heterogeneities of PLGA degradation and erosion within a spherical particle. The analytical solution is applicable to other spherical systems with simultaneous diffusive transport and first-order generation by reaction.
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Affiliation(s)
- Ashlee N. Ford Versypt
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States of America
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Paul D. Arendt
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States of America
| | - Daniel W. Pack
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States of America
- Department of Chemical and Materials Engineering, University of Kentucky, Lexington, Kentucky, United States of America
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, Kentucky, United States of America
| | - Richard D. Braatz
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, United States of America
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- * E-mail:
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57
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Keles H, Naylor A, Clegg F, Sammon C. The application of non-linear curve fitting routines to the analysis of mid-infrared images obtained from single polymeric microparticles. Analyst 2015; 139:2355-69. [PMID: 24665462 DOI: 10.1039/c3an01879b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For the first time, we report a series of time resolved images of a single PLGA microparticle undergoing hydrolysis at 70 °C that have been obtained using attenuated total reflectance-Fourier transform infrared spectroscopic (ATR-FTIR) imaging. A novel partially supervised non-linear curve fitting (NLCF) tool was developed to identify and fit peaks to the infrared spectrum obtained from each pixel within the 64 × 64 array. The output from the NLCF was evaluated by comparison with a traditional peak height (PH) data analysis approach and multivariate curve resolution alternating least squares (MCR-ALS) analysis for the same images, in order to understand the limitations and advantages of the NLCF methodology. The NLCF method was shown to facilitate consistent spatial resolution enhancement as defined using the step-edge approach on dry microparticle images when compared to images derived from both PH measurements and MCR-ALS. The NLCF method was shown to improve both the S/N and sharpness of images obtained during an evolving experiment, providing a better insight into the magnitude of hydration layers and particle dimension changes during hydrolysis. The NLCF approach facilitated the calculation of hydrolysis rate constants for both the glycolic (kG) and lactic (kL) acid segments of the PLGA copolymer. This represents a real advantage over MCR-ALS which could not distinguish between the two segments due to colinearity within the data. The NLCF approach made it possible to calculate the hydrolysis rate constants from a single pixel, unlike the peak height data analysis approach which suffered from poor S/N at each pixel. These findings show the potential value of applying NLCF to the study of real-time chemical processes at the micron scale, assisting in the understanding of the mechanisms of chemical processes that occur within microparticles and enhancing the value of the mid-IR ATR analysis.
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Affiliation(s)
- Hakan Keles
- Sheffield Hallam University, Materials and Engineering Research Institute, Sheffield, S1 1WB, UK.
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58
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Rasheed N, Khorasani AA, Cebral J, Mut F, Löhner R, Salvador-Morales C. Mechanisms Involved in the Formation of Biocompatible Lipid Polymeric Hollow Patchy Particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6639-6648. [PMID: 26057588 DOI: 10.1021/acs.langmuir.5b01551] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Patchy polymeric particles have anisotropic surface domains that can be remarkably useful in diverse medical and industrial fields because of their ability to simultaneously present two different surface chemistries on the same construct. In this article, we report the mechanisms involved in the formation of novel lipid-polymeric hollow patchy particles during their synthesis. By cross-sectioning the patchy particles, we found that a phase segregation phenomenon occurs between the core, shell, and patch. Importantly, we found that the shear stress that the polymer blend undergoes during the particle synthesis is the most important parameter for the formation of these patchy particles. In addition, we found that the interplay of solvent-solvent, polymer-solvent, and polymer-polymer-solvent interactions generates particles with different surface morphologies. Understanding the mechanisms involved in the formation of patchy particles allows us to have a better control on their physicochemical properties. Therefore, these fundamental studies are critical to achieve batch control and scalability, which are essential aspects that must be addressed in any type of particle synthesis to be safely used in medicine.
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Affiliation(s)
- Nashaat Rasheed
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Ali A Khorasani
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Juan Cebral
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Fernando Mut
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Rainald Löhner
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
| | - Carolina Salvador-Morales
- †Bioengineering Department, ‡Krasnow Institute for Advanced Study, §Department of Chemistry and Biochemistry, and ∥Center for Computational Fluid Dynamics, College of Sciences, George Mason University, Fairfax, Virginia 22030, United States
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59
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Shivinsky A, Bronshtein T, Haber T, Machluf M. The effect of AZD2171- or sTRAIL/Apo2L-loaded polylactic-co-glycolic acid microspheres on a subcutaneous glioblastoma model. Biomed Microdevices 2015; 17:69. [DOI: 10.1007/s10544-015-9969-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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60
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Diallo AK, Guerin W, Slawinski M, Brusson JM, Carpentier JF, Guillaume SM. Block and Random Copolymers of 1,2-Cyclohexyl Cyclocarbonate and l-Lactide or Trimethylene Carbonate Synthesized by Ring-Opening Polymerization. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00548] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Abdou Khadri Diallo
- Institut des Sciences Chimiques de Rennes, Organometallics, Materials and Catalysis Laboratories, UMR 6226 CNRS-Université
de Rennes 1, Campus de Beaulieu, F-35042 Rennes, Cedex, France
| | - William Guerin
- Institut des Sciences Chimiques de Rennes, Organometallics, Materials and Catalysis Laboratories, UMR 6226 CNRS-Université
de Rennes 1, Campus de Beaulieu, F-35042 Rennes, Cedex, France
| | - Martine Slawinski
- Total Raffinage
Chimie Feluy, Zone Industrielle Feluy
C, B-7181 Seneffe, Belgium
| | - Jean-Michel Brusson
- Total S.A., Corporate Science, Tour
Michelet A, 24 Cours Michelet
- La Défense 10, 92069 Paris La Défense, Cedex, France
| | - Jean-François Carpentier
- Institut des Sciences Chimiques de Rennes, Organometallics, Materials and Catalysis Laboratories, UMR 6226 CNRS-Université
de Rennes 1, Campus de Beaulieu, F-35042 Rennes, Cedex, France
| | - Sophie M. Guillaume
- Institut des Sciences Chimiques de Rennes, Organometallics, Materials and Catalysis Laboratories, UMR 6226 CNRS-Université
de Rennes 1, Campus de Beaulieu, F-35042 Rennes, Cedex, France
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61
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Ma L, Yang Y, He C, Jia Z, Liu X, Qin J. In situ preparation and characterization of polyimide/silica composite hemispheres by inverse aqueous emulsion technique and sol-gel method. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3527-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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62
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Prajapati VD, Jani GK, Kapadia JR. Current knowledge on biodegradable microspheres in drug delivery. Expert Opin Drug Deliv 2015; 12:1283-99. [DOI: 10.1517/17425247.2015.1015985] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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63
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Jaworska J, Jelonek K, Sobota M, Kasperczyk J, Dobrzynski P, Musial-Kulik M, Smola-Dmochowska A, Janeczek H, Jarzabek B. Shape-memory bioresorbable terpolymer composite with antirestenotic drug. J Appl Polym Sci 2015. [DOI: 10.1002/app.41902] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Joanna Jaworska
- Centre of Polymer and Carbon Materials; Polish Academy of Sciences; M. Curie Sklodowskiej 34 Zabrze Poland
| | - Katarzyna Jelonek
- Centre of Polymer and Carbon Materials; Polish Academy of Sciences; M. Curie Sklodowskiej 34 Zabrze Poland
| | - Michal Sobota
- Centre of Polymer and Carbon Materials; Polish Academy of Sciences; M. Curie Sklodowskiej 34 Zabrze Poland
| | - Janusz Kasperczyk
- Centre of Polymer and Carbon Materials; Polish Academy of Sciences; M. Curie Sklodowskiej 34 Zabrze Poland
- Department of Biopharmacy, School of Pharmacy; Medical University of Silesia; Narcyzow 1 Sosnowiec Poland
| | - Piotr Dobrzynski
- Centre of Polymer and Carbon Materials; Polish Academy of Sciences; M. Curie Sklodowskiej 34 Zabrze Poland
- Jan Dlugosz University in Czestochowa, Institute of Chemistry; Environmental Protection and Biotechnology; Armii Krajowej 13 Czestochowa Poland
| | - Monika Musial-Kulik
- Centre of Polymer and Carbon Materials; Polish Academy of Sciences; M. Curie Sklodowskiej 34 Zabrze Poland
| | - Anna Smola-Dmochowska
- Centre of Polymer and Carbon Materials; Polish Academy of Sciences; M. Curie Sklodowskiej 34 Zabrze Poland
| | - Henryk Janeczek
- Centre of Polymer and Carbon Materials; Polish Academy of Sciences; M. Curie Sklodowskiej 34 Zabrze Poland
| | - Bozena Jarzabek
- Centre of Polymer and Carbon Materials; Polish Academy of Sciences; M. Curie Sklodowskiej 34 Zabrze Poland
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64
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Wongmahasirikun P, Prom-on P, Sangtrirutnugul P, Kongsaeree P, Phomphrai K. Synthesis of cyclic polyesters: effects of alkoxy side chains in salicylaldiminato tin(ii) complexes. Dalton Trans 2015; 44:12357-64. [DOI: 10.1039/c5dt00139k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new salicylaldiminato tin(ii) catalyst system having alkoxy side chains has been developed and shown to effectively polymerize l-lactide and ε-caprolactone giving cyclic PLA and cyclic PCL, respectively.
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Affiliation(s)
- Phonpimon Wongmahasirikun
- Center for Catalysis
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
| | - Paweenuch Prom-on
- Center for Catalysis
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
| | - Preeyanuch Sangtrirutnugul
- Center for Catalysis
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
| | - Palangpon Kongsaeree
- Center for Catalysis
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
| | - Khamphee Phomphrai
- Center for Catalysis
- Department of Chemistry and Center of Excellence for Innovation in Chemistry
- Faculty of Science
- Mahidol University
- Bangkok 10400
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65
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Saha D, Moken T, Chen J, Hensley DK, Delaney K, Hunt MA, Nelson K, Spurri A, Benham L, Brice R, Azoro M. Micro-/mesoporous carbons for controlled release of antipyrine and indomethacin. RSC Adv 2015. [DOI: 10.1039/c5ra00251f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We have demonstrated the potential of meso- and microporous carbons in controlled release applications and targeted oral drug delivery.
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Affiliation(s)
- Dipendu Saha
- Department of Chemical Engineering
- Widener University
- USA
| | - Tara Moken
- Department of Chemical Engineering
- Widener University
- USA
| | - Jihua Chen
- Center for Nanophase Materials Sciences
- Oak Ridge National Laboratory
- Oak Ridge
- USA
| | - Dale K. Hensley
- Center for Nanophase Materials Sciences
- Oak Ridge National Laboratory
- Oak Ridge
- USA
| | - Kristen Delaney
- Department of Biological Sciences
- Fayetteville State University
- USA
| | - Marcus A. Hunt
- Department of Biological Sciences
- Fayetteville State University
- USA
| | - Karl Nelson
- Department of Chemical Engineering
- Widener University
- USA
| | - Amada Spurri
- Department of Chemical Engineering
- Widener University
- USA
| | - Lauren Benham
- Department of Chemical Engineering
- Widener University
- USA
| | - Robin Brice
- Department of Biological Sciences
- Fayetteville State University
- USA
| | - Martina Azoro
- Department of Biological Sciences
- Fayetteville State University
- USA
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66
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Development of microspheres for biomedical applications: a review. Prog Biomater 2014; 4:1-19. [PMID: 29470791 PMCID: PMC5151111 DOI: 10.1007/s40204-014-0033-8] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2014] [Accepted: 11/25/2014] [Indexed: 02/08/2023] Open
Abstract
An overview of microspheres manufactured for use in biomedical applications based on recent literature is presented in this review. Different types of glasses (i.e. silicate, borate, and phosphates), ceramics and polymer-based microspheres (both natural and synthetic) in the form of porous , non-porous and hollow structures that are either already in use or are currently being investigated within the biomedical area are discussed. The advantages of using microspheres in applications such as drug delivery, bone tissue engineering and regeneration, absorption and desorption of substances, kinetic release of the loaded drug components are also presented. This review also reports on the preparation and characterisation methodologies used for the manufacture of these microspheres. Finally, a brief summary of the existing challenges associated with processing these microspheres which requires further research and development are presented.
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67
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Jia P, Bo C, Hu L, Zhou Y. Synthesis and characterization of glyceryl monooleate-based polyester. KOREAN J CHEM ENG 2014. [DOI: 10.1007/s11814-014-0214-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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68
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Rohman G. Materials Used in Biomaterial Applications. Biomaterials 2014. [DOI: 10.1002/9781119043553.ch3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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69
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Kaur H, Rathore A, Raju S. A study on ZnO nanoparticles catalyzed ring opening polymerization of L-lactide. JOURNAL OF POLYMER RESEARCH 2014. [DOI: 10.1007/s10965-014-0537-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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70
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Kuehl C, El-Gendy N, Berkland C. NanoClusters surface area allows nanoparticle dissolution with microparticle properties. J Pharm Sci 2014; 103:1787-98. [PMID: 24788354 DOI: 10.1002/jps.23980] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 03/28/2014] [Accepted: 04/01/2014] [Indexed: 01/01/2023]
Abstract
Poorly water-soluble drugs comprise the majority of new drug molecules. Nanoparticle agglomerates, called NanoClusters, can increase the dissolution rate of poorly soluble compounds by increasing particle surface area. Budesonide and danazol, two poorly soluble steroids, were studied as model compounds. NanoCluster suspensions were made using a Netzsch MiniCer media mill with samples collected between 5 and 15 h and lyophilized. Differential scanning calorimetry (DSC) and powder X-ray Diffraction were used to evaluate the physicochemical properties of the powders, and Brunauer, Emmett and Teller (BET) analysis was used to determine surface area. Scanning electron microscopy confirmed NanoClusters were between 1 and 5 μm. NanoCluster samples showed an increase in dissolution rate compared with the micronized stock and similar to a dried nanoparticle suspension. BET analysis determined an increase in surface area of eight times for budesonide NanoClusters and 10-15 times for danazol NanoClusters compared with the micronized stock. Melting temperatures decreased with increased mill time of NanoClusters by DSC. The increased surface area of NanoClusters provides a potential micron-sized alternative to nanoparticles to increase dissolution rate of poorly water-soluble drugs.
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Affiliation(s)
- Christopher Kuehl
- Department of Pharmaceutical Chemistry, The University of Kansas, Lawrence, Kansas, 66047
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71
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Affiliation(s)
- Sindhu Doppalapudi
- Department of Pharmaceutics; National Institute of Pharmaceutical Education and Research (NIPER); Hyderabad 500037 India
| | - Anjali Jain
- Department of Pharmaceutics; National Institute of Pharmaceutical Education and Research (NIPER); Hyderabad 500037 India
| | - Wahid Khan
- Department of Pharmaceutics; National Institute of Pharmaceutical Education and Research (NIPER); Hyderabad 500037 India
- School of Pharmacy-Faculty of Medicine; The Hebrew University of Jerusalem; Jerusalem 91120 Israel
| | - Abraham J. Domb
- School of Pharmacy-Faculty of Medicine; The Hebrew University of Jerusalem; Jerusalem 91120 Israel
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72
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Wang H, Xu Y, Zhou X. Docetaxel-loaded chitosan microspheres as a lung targeted drug delivery system: in vitro and in vivo evaluation. Int J Mol Sci 2014; 15:3519-32. [PMID: 24577314 PMCID: PMC3975351 DOI: 10.3390/ijms15033519] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2013] [Revised: 02/10/2014] [Accepted: 02/12/2014] [Indexed: 11/30/2022] Open
Abstract
The aim of this study was to prepare docetaxel-loaded chitosan microspheres and to evaluate their in vitro and in vivo characteristics. Glutaraldehyde crosslinked microspheres were prepared using a water-in-oil emulsification method, and characterized in terms of the morphological examination, particle size distribution, encapsulation ratio, drug-loading coefficient and in vitro release. Pharmacokinetics and biodistribution studies were used to evaluate that microspheres have more advantage than the conventional formulations. The emulsion crosslinking method was simple to prepare microspheres and easy to scale up. The formed microspheres were spherical in shape, with a smooth surface and the size was uniform (9.6 ± 0.8 μm); the encapsulation efficiency and drug loading of prepared microspheres were 88.1% ± 3.5% and 18.7% ± 1.2%, respectively. In vitro release indicated that the DTX microspheres had a well-sustained release efficacy and in vivo studies showed that the microspheres were found to release the drug to a maximum extent in the target tissue (lung). The prepared microspheres were found to possess suitable physico-chemical properties and the particle size range. The sustained release of DTX from microspheres revealed its applicability as drug delivery system to minimize the exposure of healthy tissues while increasing the accumulation of therapeutic drug in target sites.
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Affiliation(s)
- Hao Wang
- Department of Thoracic surgery, Shanghai Pulmonary Hospital, Tongji University School of Medicine, 507 Zheng Min Road, Yangpu District, Shanghai 200433, China.
| | - Yongdong Xu
- Department of Thoracic surgery, Shanghai Pudong Hospital, Fudan University Pudong Medical Center, 2800 Gong Wei Road, Hui Nan Town, Pudong, Shanghai 201399, China.
| | - Xiao Zhou
- Department of Thoracic surgery, Shanghai Pulmonary Hospital, Tongji University School of Medicine, 507 Zheng Min Road, Yangpu District, Shanghai 200433, China.
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73
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Development of Risperidone PLGA Microspheres. JOURNAL OF DRUG DELIVERY 2014; 2014:620464. [PMID: 24616812 PMCID: PMC3927762 DOI: 10.1155/2014/620464] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Accepted: 10/20/2013] [Indexed: 11/21/2022]
Abstract
The aim of this study was to design and evaluate biodegradable PLGA microspheres for sustained delivery of Risperidone, with an eventual goal of avoiding combination therapy for the treatment of schizophrenia. Two PLGA copolymers (50 : 50 and 75 : 25) were used to prepare four microsphere formulations of Risperidone. The microspheres were characterized by several in vitro techniques. In vivo studies in male Sprague-Dawley rats at 20 and 40 mg/kg doses revealed that all formulations exhibited an initial burst followed by sustained release of the active moiety. Additionally, formulations prepared with 50 : 50 PLGA had a shorter duration of action and lower cumulative AUC levels than the 75 : 25 PLGA microspheres. A simulation of multiple dosing at weekly or 15-day regimen revealed pulsatile behavior for all formulations with steady state being achieved by the second dose. Overall, the clinical use of Formulations A, B, C, or D will eliminate the need for combination oral therapy and reduce time to achieve steady state, with a smaller washout period upon cessation of therapy. Results of this study prove the suitability of using PLGA copolymers of varying composition and molecular weight to develop sustained release formulations that can tailor in vivo behavior and enhance pharmacological effectiveness of the drug.
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74
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Bhatnagar S, Naqvi RA, Ali R, Rao DN. Preparation of peptide microspheres using tumor antigen-derived peptides. Methods Mol Biol 2014; 1139:443-452. [PMID: 24619698 DOI: 10.1007/978-1-4939-0345-0_34] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Due to its distinct biological attributes, poly(D,L lactide-co glycolide) (PLGA) is one of the most preferred methods for DNA/protein/peptide encapsulation for therapeutics. Importantly, PLGA acts as an adjuvant for weakly immunogenic antigens and mimics booster responses after a single dose of administration, thereby serving as a single-shot vaccine delivery vehicle. Efficient delivery of antigens to antigen-presenting cells (APC) has been made possible by the use of a PLGA particle-based vaccine delivery system. Also, the plasma half-life of the PLGA-encapsulated vaccine increases as it is protected from degradation, prior to its further release. PLGAs are reported to be catabolized into individual nontoxic units once inside the host and further degraded via normal metabolic pathways. In this chapter, we have described the preparation and characterization of tumor peptide encapsulated PLGA microparticles as a model for controlled-release peptide delivery system.
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Affiliation(s)
- Santwana Bhatnagar
- Department of Biochemistry, All India Institute of Medical Sciences, New Delhi, India
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75
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Grant N, Wu H, Zhang H. Reduction-Controlled Release of Organic Nanoparticles from Disulfide Cross-linked Porous Polymer. Ind Eng Chem Res 2013. [DOI: 10.1021/ie403001r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Neil Grant
- Department
of Chemistry, University of Liverpool, Oxford Street, Liverpool, L69 7ZD, United Kingdom
| | - Hong Wu
- Department
of Pharmaceutical Chemistry and Pharmaceutical Analysis, School of
Pharmacy, Fourth Military Medical University, Xi’an 710032, China
| | - Haifei Zhang
- Department
of Chemistry, University of Liverpool, Oxford Street, Liverpool, L69 7ZD, United Kingdom
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76
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Gañán-Calvo A, Montanero J, Martín-Banderas L, Flores-Mosquera M. Building functional materials for health care and pharmacy from microfluidic principles and Flow Focusing. Adv Drug Deliv Rev 2013; 65:1447-69. [PMID: 23954401 DOI: 10.1016/j.addr.2013.08.003] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2013] [Revised: 08/02/2013] [Accepted: 08/02/2013] [Indexed: 12/11/2022]
Abstract
In this review, we aim at establishing a relationship between the fundamentals of the microfluidics technologies used in the Pharmacy field, and the achievements accomplished by those technologies. We describe the main methods for manufacturing micrometer drops, bubbles, and capsules, as well as the corresponding underlying physical mechanisms. In this regard, the review is intended to show non-specialist readers the dynamical processes which determine the success of microfluidics techniques. Flow focusing (FF) is a droplet-based method widely used to produce different types of fluid entities on a continuous basis by applying an extensional co-flow. We take this technique as an example to illustrate how microfluidics technologies for drug delivery are progressing from a deep understanding of the physics of fluids involved. Specifically, we describe the limitations of FF, and review novel methods which enhance its stability and robustness. In the last part of this paper, we review some of the accomplishments of microfluidics when it comes to drug manufacturing and delivery. Special attention is paid to the production of the microencapsulated form because this fluidic structure gathers the main functionalities sought for in Pharmacy. We also show how FF has been adapted to satisfy an ample variety of pharmaceutical requirements to date.
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77
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Sattayanon C, Kungwan N, Punyodom W, Meepowpan P, Jungsuttiwong S. Theoretical investigation on the mechanism and kinetics of the ring-opening polymerization of ε-caprolactone initiated by tin(II) alkoxides. J Mol Model 2013; 19:5377-85. [PMID: 24173613 DOI: 10.1007/s00894-013-2026-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2012] [Accepted: 09/30/2013] [Indexed: 11/26/2022]
Affiliation(s)
- Chanchai Sattayanon
- Center of Excellence for Innovation in Chemistry, Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, Thailand, 50200
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78
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Tawfeek HM. Evaluation of PEG and mPEG-co-(PGA-co-PDL) microparticles loaded with sodium diclofenac. Saudi Pharm J 2013; 21:387-97. [PMID: 24227959 PMCID: PMC3824949 DOI: 10.1016/j.jsps.2012.11.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The aim of this study was to synthesize and evaluate novel biodegradable polyesters namely; poly(ethylene glycol)-Poly(glycerol adipate-co-ω-pentadecalactone), PEG-PGA-co-PDL-PEG, and poly(ethylene glycol methyl ether)-Poly(glycerol adipate-co-ω-pentadecalactone), PGA-co-PDL-PEGme as an alternative sustained release carrier for lung delivery compared with non-PEG containing polymer PGA-co-PDL. The co-polymers were synthesized through lipase catalysis ring opening polymerization reaction and characterized using GPC, FT-IR, (1)H-NMR and surface contact angle. Furthermore, microparticles containing a model hydrophilic drug, sodium diclofenac, were prepared via spray drying from a modified single emulsion and characterized for their encapsulation efficiency, geometrical particle size, zeta potential, tapped density, primary aerodynamic diameter, amorphous nature, morphology, in vitro release and the aerosolization performance. Microparticles fabricated from mPEG-co-polymer can be targeted to the lung periphery with an optimum in vitro deposition. Furthermore, a significantly higher in vitro release (p > 0.05, ANOVA/Dunnett's) was observed with the PEG and mPEG-co-polymers compared to PGA-co-PDL. In addition, these co-polymers have a good safety profile upon testing on human bronchial epithelial, 16HBE14o- cell lines.
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Affiliation(s)
- Hesham M. Tawfeek
- Department of Industrial Pharmacy, Faculty of Pharmacy, Assiut University, Assiut, Egypt
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79
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Kong T, Wu J, Yeung KWK, To MKT, Shum HC, Wang L. Microfluidic fabrication of polymeric core-shell microspheres for controlled release applications. BIOMICROFLUIDICS 2013; 7:44128. [PMID: 24404061 PMCID: PMC3772936 DOI: 10.1063/1.4819274] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Accepted: 08/07/2013] [Indexed: 05/03/2023]
Abstract
We report a facile and robust microfluidic method to fabricate polymeric core-shell microspheres as delivery vehicles for biomedical applications. The characteristics of core-shell microspheres can be precisely and easily tuned by manipulating the microfluidic double emulsion templates. The addition of a shell can significantly improve the versatility as well as functionality of these microspheres as delivery vehicles. We demonstrate that the nature of the shell material plays an important role in the properties of the core-shell delivery vehicles. The release kinetics is significantly influenced by the material of the shell and other characteristics such as the thickness. For example, by adding a poly(lactic-co-glycolic acid) (PLGA) shell to an alginate core, the encapsulation efficiency is enhanced and undesired leakage of hydrophilic actives is prevented. By contrast, adding an alginate shell to PLGA core can lead to a reduction of the initial release rate, thus extending the release period of hydrophobic actives. Microfluidic fabrication enables the generation of precisely controlled core-shell microspheres with a narrow size distribution, which enables the investigation of the relationship between the release kinetics of these microspheres and their characteristics. The approach of using core-shell particles as delivery vehicles creates new opportunities to customize the release kinetics of active ingredients.
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Affiliation(s)
- Tiantian Kong
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong ; HKU-Zhejiang Institute of Research and Innovation (HKU-ZIRI), 311100 Linan, Zhejiang, China
| | - Jun Wu
- Department of Orthopaedics and Traumatology, Li Ka Shing Faculty of Medicine, HKU, HK, China
| | - Kelvin Wai Kwok Yeung
- Department of Orthopaedics and Traumatology, Li Ka Shing Faculty of Medicine, HKU, HK, China
| | - Michael Kai Tsun To
- Department of Orthopaedics and Traumatology, Li Ka Shing Faculty of Medicine, HKU, HK, China
| | - Ho Cheung Shum
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong ; HKU-Shenzhen Institute of Research and Innovation (HKU-SIRI), 518000 Shenzhen, Guangdong, China
| | - Liqiu Wang
- Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong ; HKU-Zhejiang Institute of Research and Innovation (HKU-ZIRI), 311100 Linan, Zhejiang, China
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80
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Tawfeek HM, Khidr SH, Samy EM, Ahmed SM, Gaskell EE, Hutcheon GA. Evaluation of biodegradable polyester-co-lactone microparticles for protein delivery. Drug Dev Ind Pharm 2013; 40:1213-22. [DOI: 10.3109/03639045.2013.814060] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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81
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82
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Comparative study of various delivery methods for the supply of alpha-ketoglutarate to the neural cells for tissue engineering. BIOMED RESEARCH INTERNATIONAL 2013; 2013:294679. [PMID: 23878803 PMCID: PMC3708389 DOI: 10.1155/2013/294679] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2013] [Accepted: 06/07/2013] [Indexed: 12/18/2022]
Abstract
Delivery of growth factors or bioactive molecules plays an important role in tissue engineering, as the duration to which these are supplied can modulate the cell fate. Thus, the delivery method plays an important role, and the same is presented in this work wherein the exogenous supply of alpha-ketoglutarate (α-KG) gave better results for fast proliferating cells as compared to delivery by microspheres or microspheres incorporated scaffolds which can be used while culturing slow growing cells. All these studies were performed in two dimensional (2D) and three dimensional (3D) setups in which chitosan-gelatin-polypyrrole has been used as 3-D scaffolds. Chitosan and gelatin microspheres alone as well as incorporated in the cryogels were characterized. MTT assay done using neuro-2a cell line showed approximately 42% and 70% increment in cellular proliferation when gelatin and chitosan microspheres were added in a 3-D setup, respectively, as compared to the control. Biochemical analysis of ammonia showed 6-fold reductions in ammonia level in a 3-D setup compared to the control. We also studied the synthesis of a neurotransmitter-like glutamate and found that its concentration increased up to 0.25 mg/ml when the microspheres were added exogenously in a 3-D system.
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83
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Saha D, Payzant EA, Kumbhar AS, Naskar AK. Sustainable mesoporous carbons as storage and controlled-delivery media for functional molecules. ACS APPLIED MATERIALS & INTERFACES 2013; 5:5868-5874. [PMID: 23731336 DOI: 10.1021/am401661f] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Here, we report the synthesis of surfactant-templated mesoporous carbons from lignin, which is a biomass-derived polymeric precursor, and their potential use as a controlled-release medium for functional molecules such as pharmaceuticals. To the best of our knowledge, this is the first report on the use of lignin for chemical-activation-free synthesis of functional mesoporous carbon. The synthesized carbons possess the pore widths within the range of 2.5-12.0 nm. In this series of mesoporous carbons, our best result demonstrates a Brunauer-Emmett-Teller (BET) surface area of 418 m(2)/g and a mesopore volume of 0.34 cm(3)/g, which is twice the micropore volume in this carbon. Because of the dominant mesoporosity, this engineered carbon demonstrates adsorption and controlled release of a representative pharmaceutical drug, captopril, in simulated gastric fluid. Large-scale utilization of these sustainable mesoporous carbons in applications involving adsorption, transport, and controlled release of functional molecules is desired for industrial processes that yield lignin as a coproduct.
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Affiliation(s)
- Dipendu Saha
- Carbon and Composites Group, Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
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84
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Effect of concentration and degree of saturation on co-precipitation of catechin and poly(l-lactide) by the RESOLV process. J Supercrit Fluids 2013. [DOI: 10.1016/j.supflu.2012.12.024] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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85
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Vieira IDS, Whitelaw EL, Jones MD, Herres-Pawlis S. Synergistic Empirical and Theoretical Study on the Stereoselective Mechanism for the Aluminum Salalen Complex Mediated Polymerization ofrac-Lactide. Chemistry 2013; 19:4712-6. [DOI: 10.1002/chem.201203973] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2012] [Revised: 01/28/2013] [Indexed: 11/08/2022]
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86
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Chen W, Wu Z, Yang H, Guo S, Li D, Cheng L. In vitroandin vivoevaluation of injectable implants for intratumoral delivery of 5-fluorouracil. Pharm Dev Technol 2013; 19:223-31. [DOI: 10.3109/10837450.2013.769568] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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87
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Zhu C, Yang Q, Lv F, Liu L, Wang S. Conjugated polymer-coated bacteria for multimodal intracellular and extracellular anticancer activity. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2013; 25:1203-8. [PMID: 23280674 DOI: 10.1002/adma.201204550] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2012] [Indexed: 05/27/2023]
Affiliation(s)
- Chunlei Zhu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Organic Solids, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
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88
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Ercolani E, Del Gaudio C, Bianco A. Vascular tissue engineering of small-diameter blood vessels: reviewing the electrospinning approach. J Tissue Eng Regen Med 2013; 9:861-88. [DOI: 10.1002/term.1697] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Revised: 10/08/2012] [Accepted: 12/20/2012] [Indexed: 11/07/2022]
Affiliation(s)
- Enrico Ercolani
- Department of Industrial Engineering, INSTM Research Unit Roma Tor Vergata; University of Rome ‘Tor Vergata’; Via del Politecnico 1 00133 Rome Italy
| | - Costantino Del Gaudio
- Department of Industrial Engineering, INSTM Research Unit Roma Tor Vergata; University of Rome ‘Tor Vergata’; Via del Politecnico 1 00133 Rome Italy
| | - Alessandra Bianco
- Department of Industrial Engineering, INSTM Research Unit Roma Tor Vergata; University of Rome ‘Tor Vergata’; Via del Politecnico 1 00133 Rome Italy
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89
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Janaswamy S, Gill KL, Campanella OH, Pinal R. Organized polysaccharide fibers as stable drug carriers. Carbohydr Polym 2013; 94:209-15. [PMID: 23544530 DOI: 10.1016/j.carbpol.2013.01.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 01/04/2013] [Accepted: 01/05/2013] [Indexed: 10/27/2022]
Abstract
Many challenges arise during the development of new drug carrier systems, and paramount among them are safety, solubility and controlled release requirements. Although synthetic polymers are effective, the possibility of side effects imposes restrictions on their acceptable use and dose limits. Thus, a new drug carrier system that is safe to handle and free from side effects is very much in need and food grade polysaccharides stand tall as worthy alternatives. Herein, we demonstrate for the first time the feasibility of sodium iota-carrageenan fibers and their distinctive water pockets to embed and release a wide variety of drug molecules. Structural analysis has revealed the existence of crystalline network in the fibers even after encapsulating the drug molecules, and iota-carrageenan maintains its characteristic and reproducible double helical structure suggesting that the composites thus produced are reminiscent of cocrystals. The melting properties of iota-carrageenan:drug complexes are distinctly different from those of either drug or iota-carrageenan fiber. The encapsulated drugs are released in a sustained manner from the fiber matrix. Overall, our research provides an elegant opportunity for developing effective drug carriers with stable network toward enhancing and/or controlling bioavailability and extending shelf-life of drug molecules using GRAS excipients, food polysaccharides, that are inexpensive and non-toxic.
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Affiliation(s)
- Srinivas Janaswamy
- Whistler Center for Carbohydrate Research, Department of Food Science, Purdue University, West Lafayette, IN 47907, USA.
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90
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Ford Versypt AN, Pack DW, Braatz RD. Mathematical modeling of drug delivery from autocatalytically degradable PLGA microspheres--a review. J Control Release 2012; 165:29-37. [PMID: 23103455 DOI: 10.1016/j.jconrel.2012.10.015] [Citation(s) in RCA: 221] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Accepted: 10/18/2012] [Indexed: 10/27/2022]
Abstract
PLGA microspheres are widely studied for controlled release drug delivery applications, and many models have been proposed to describe PLGA degradation and erosion and drug release from the bulk polymer. Autocatalysis is known to have a complex role in the dynamics of PLGA erosion and drug transport and can lead to size-dependent heterogeneities in otherwise uniformly bulk-eroding polymer microspheres. The aim of this review is to highlight mechanistic, mathematical models for drug release from PLGA microspheres that specifically address interactions between phenomena generally attributed to autocatalytic hydrolysis and mass transfer limitation effects. Predictions of drug release profiles by mechanistic models are useful for understanding mechanisms and designing drug release particles.
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Affiliation(s)
- Ashlee N Ford Versypt
- Department of Chemical and Biomolecular Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
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91
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Yang Y, Jia Z, Wang Y, Gu Y, Qin J. Preparation of hemispherical polyimide particles by inverse emulsion technique from poly(amic acid) ammonium salts. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2827-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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92
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Kukut M, Karal-Yilmaz O, Yagci Y. Synthesis, characterization, and hydrolytic degradation of graft copolymers of polystyrene and aliphatic polyesters. Des Monomers Polym 2012. [DOI: 10.1080/15685551.2012.725214] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Affiliation(s)
- Manolya Kukut
- a Department of Chemistry , Istanbul Tehnical University , Maslak, Istanbul , 34469 , Turkey
| | - Oksan Karal-Yilmaz
- b TUBITAK , Marmara Research Center, Genetic Engineering and Biotechnology Institute , Gebze , 41470 , Kocaeli , Turkey
| | - Yusuf Yagci
- a Department of Chemistry , Istanbul Tehnical University , Maslak, Istanbul , 34469 , Turkey
- c Faculty of Science, Chemistry Department , King Abdulaziz University , Jeddah , Saudi Arabia
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93
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Formulation of salicylate-based poly(anhydride-ester) microspheres for short- and long-term salicylic acid delivery. Polym Bull (Berl) 2012; 70:343-351. [PMID: 23420391 DOI: 10.1007/s00289-012-0839-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The formulation of salicylate-based poly(anhydride-ester) (PAE) microspheres was optimized by altering polymer concentration and homogenization speed to improve the overall morphology. The microspheres were prepared using three salicylate-based PAEs with different chemical compositions comprised of either a heteroatomic, linear aliphatic, or branched aliphatic moiety. These PAEs broadened the range of complete salicylic acid release to now include days, weeks and months. The molecular weight (M(w)), polydispersity index (PDI) and glass transition temperature (T(g)) of the formulated polymers were compared to the unformulated polymers. In general, the M(w) and PDI exhibited decreased and increased values, respectively, after formulation, whereas the T(g) changes did not follow a specific trend. Microsphere size and morphology were determined using scanning electron microscopy. These microspheres exhibited smooth surfaces, no aggregation, and size distributions ranging from 2-34 m in diameter. In vitro release studies of the chemically incorporated salicylic acid displayed widely tunable release profiles.
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94
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Bhangale AS, Beers KL, Gross RA. Enzyme-Catalyzed Polymerization of End-Functionalized Polymers in a Microreactor. Macromolecules 2012. [DOI: 10.1021/ma301178k] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Atul S. Bhangale
- Center for Biocatalysis and
Bioprocessing of Macromolecules, Department of Chemical and Biological
Sciences, Polytechnic Institute of NYU,
Brooklyn, New York 11201, United States
| | - Kathryn L. Beers
- Polymers Division, National Institute of Standards and Technology, Gaithersburg,
Maryland 20899, United States
| | - Richard A. Gross
- Center for Biocatalysis and
Bioprocessing of Macromolecules, Department of Chemical and Biological
Sciences, Polytechnic Institute of NYU,
Brooklyn, New York 11201, United States
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95
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Pepic D, Nikolic MS, Grujic S, Lausevic M, Djonlagic J. Release behaviour of carbamazepine-loaded poly(ε-caprolactone)/poly(ethylene oxide) microspheres. J Microencapsul 2012; 30:151-60. [PMID: 22852775 DOI: 10.3109/02652048.2012.704954] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Poly(ε-caprolactone) (PCL), a biodegradable and biocompatible aliphatic polyester has a great potential as a drug carrying material in controlled drug delivery/release systems. The most simple and economical way to tailor the release profile of active substances from biodegradable polymer matrix is by the addition of the second polymeric component in the polymer matrix, i.e. by blending. This study describes the preparation and characterization of a carbamazepine-loaded microspheres by the use of PCL blended with poly(ethylene oxide) as a drug carrying material. By the use of two-component hydrophilic/hydrophobic polymer blend as a microspheres' matrix material, release profile of the drug can be modified and dictated. The microspheres prepared by classical oil-in-water emulsion solvent evaporation technique were characterized with respect to particle size and morphology, polymer matrix composition, encapsulation efficiency, physical state of the drug and in vitro release behaviour. It was presented that the release profile can be modified by the presence and the amount of hydrophilic component in the starting formulation of microspheres.
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96
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Nugroho RWN, Odelius K, Höglund A, Albertsson AC. Nondestructive covalent "grafting-from" of poly(lactide) particles of different geometries. ACS APPLIED MATERIALS & INTERFACES 2012; 4:2978-2984. [PMID: 22591188 DOI: 10.1021/am3003507] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A nondestructive "grafting-from" method has been developed using poly(lactide) (PLA) particles of different shapes as substrates and three hydrophilic monomers as grafts. Irregularly shaped particles and spheres of PLA were covalently surface functionalized using a versatile method of photoinduced free radical polymerization. The preservation of the molecular weight of the PLA particle bulk and the retention of the original particle shape confirmed the negligible effect of the grafting method. The changes in surface composition were determined by FTIR for both spherical and irregular particles and by XPS for the irregular particles showing the versatility of the method. Changes in the surface morphology of the PLA spherical particles were observed using microscopy techniques showing a full surface coverage of one of the grafted monomers. The method is applicable to a wide set of grafting monomers and provides a permanent alteration of the surface chemistry of the PLA particles creating hydrophilic PLA surfaces in addition to creating sites for further modification and drug delivery in the biomedical fields.
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Affiliation(s)
- Robertus Wahyu N Nugroho
- Department of Fibre and Polymer Technology, KTH Royal Institute of Technology , SE-10044, Stockholm, Sweden
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97
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Bohr A, Kristensen J, Dyas M, Edirisinghe M, Stride E. Release profile and characteristics of electrosprayed particles for oral delivery of a practically insoluble drug. J R Soc Interface 2012; 9:2437-49. [PMID: 22535697 DOI: 10.1098/rsif.2012.0166] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Poly(lactic-co-glycolic acid) (PLGA) microspheres containing celecoxib were prepared via electrospraying, and the influence of three processing parameters namely flow rate, solute concentration and drug loading, on the physico-chemical properties of the particles and the drug-release profile was studied. Microspheres with diameters between 2 and 8 μm were produced and a near-monodisperse size distribution was achieved (polydispersivity indices of 6-12%). Further, the inner structure of the particles showed that the internal porosity of the particles increased with increasing solvent concentration. X-ray powder diffraction (XRPD) analysis indicated that the drug was amorphous and remained stable after eight months of storage. Drug release was studied in USP 2 (United States Pharmacopeia Dissolution Apparatus 2) dissolution chambers, and differences in release profiles were observed depending on the parametric values. Changes in release rate were found to be directly related to the influence of the studied parameters on particle size and porosity. The results indicate that electrospraying is an attractive technique for producing drug-loaded microspheres that can be tailored towards an intended drug-delivery application. Compared with the more conventional spray-drying process, it provides better control of particle characteristics and less aggregation during particle formation. In particular, this study demonstrated its suitability for preparing capsules in which the drug is molecularly dispersed and released in a sustained manner to facilitate improved bioavailability.
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Affiliation(s)
- Adam Bohr
- Department of Mechanical Engineering, University College London, Torrington Place, London WC1E 7JE, UK
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98
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Gilchrist SE, Rickard DL, Letchford K, Needham D, Burt HM. Phase separation behavior of fusidic acid and rifampicin in PLGA microspheres. Mol Pharm 2012; 9:1489-501. [PMID: 22482935 DOI: 10.1021/mp300099f] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The purpose of this study was to characterize the phase separation behavior of fusidic acid (FA) and rifampicin (RIF) in poly(d,l-lactic acid-co-glycolic acid) (PLGA) using a model microsphere formulation. To accomplish this, microspheres containing 20% FA with 0%, 5%, 10%, 20%, and 30% RIF and 20% RIF with 30%, 20% 10%, 5%, and 0% FA were prepared by solvent evaporation. Drug-polymer and drug-drug compatibility and miscibility were characterized using laser confocal microscopy, Raman spectroscopy, XRPD, DSC, and real-time video recordings of single-microsphere formation. The encapsulation of FA and RIF alone, or in combination, results in a liquid-liquid phase separation of solvent-and-drug-rich microdomains that are excluded from the polymer bulk during microsphere hardening, resulting in amorphous spherical drug-rich domains within the polymer bulk and on the microsphere surface. FA and RIF phase separate from PLGA at relative droplet volumes of 0.311 ± 0.014 and 0.194 ± 0.000, respectively, predictive of the incompatibility of each drug and PLGA. When coloaded, FA and RIF phase separate in a single event at the relative droplet volume 0.251 ± 0.002, intermediate between each of the monoloaded formulations and dependent on the relative contribution of FA or RIF. The release of FA and RIF from phase-separated microspheres was characterized exclusively by a burst release and was dependent on the phase exclusion of surface drug-rich domains. Phase separation results in coalescence of drug-rich microdroplets and polymer phase exclusion, and it is dependent on the compatibility between FA and RIF and PLGA. FA and RIF are mutually miscible in all proportions as an amorphous glass, and they phase separate from the polymer as such. These drug-rich domains were excluded to the surface of the microspheres, and subsequent release of both drugs from the microspheres was rapid and reflected this surface location.
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Affiliation(s)
- Samuel E Gilchrist
- Faculty of Pharmaceutical Science, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
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99
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Jiang G, Xia W, Chen W. A Hyperbranched Polymer for Encapsulation and Release of Guest Molecules. Des Monomers Polym 2012. [DOI: 10.1163/138577209x12486896623616] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Affiliation(s)
- Guohua Jiang
- a Key Laboratory of Advanced Textile Materials and Manufacturing Technology (ATMT), Zhejiang Sci-Tech University, Ministry of Education, Hangzhou 310018, P. R. China; Department of Materials Engineering, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China
| | - Wei Xia
- b Key Laboratory of Advanced Textile Materials and Manufacturing Technology (ATMT), Zhejiang Sci-Tech University, Ministry of Education, Hangzhou 310018, P. R. China; Department of Materials Engineering, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China
| | - Wenxing Chen
- c Key Laboratory of Advanced Textile Materials and Manufacturing Technology (ATMT), Zhejiang Sci-Tech University, Ministry of Education, Hangzhou 310018, P. R. China; Department of Materials Engineering, College of Materials and Textile, Zhejiang Sci-Tech University, Hangzhou 310018, P. R. China
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100
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Pakulska MM, Ballios BG, Shoichet MS. Injectable hydrogels for central nervous system therapy. Biomed Mater 2012; 7:024101. [PMID: 22456684 DOI: 10.1088/1748-6041/7/2/024101] [Citation(s) in RCA: 151] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Diseases and injuries of the central nervous system (CNS) including those in the brain, spinal cord and retina are devastating because the CNS has limited intrinsic regenerative capacity and currently available therapies are unable to provide significant functional recovery. Several promising therapies have been identified with the goal of restoring at least some of this lost function and include neuroprotective agents to stop or slow cellular degeneration, neurotrophic factors to stimulate cellular growth, neutralizing molecules to overcome the inhibitory environment at the site of injury, and stem cell transplant strategies to replace lost tissue. The delivery of these therapies to the CNS is a challenge because the blood-brain barrier limits the diffusion of molecules into the brain by traditional oral or intravenous routes. Injectable hydrogels have the capacity to overcome the challenges associated with drug delivery to the CNS, by providing a minimally invasive, localized, void-filling platform for therapeutic use. Small molecule or protein drugs can be distributed throughout the hydrogel which then acts as a depot for their sustained release at the injury site. For cell delivery, the hydrogel can reduce cell aggregation and provide an adhesive matrix for improved cell survival and integration. Additionally, by choosing a biodegradable or bioresorbable hydrogel material, the system will eventually be eliminated from the body. This review discusses both natural and synthetic injectable hydrogel materials that have been used for drug or cell delivery to the CNS including hyaluronan, methylcellulose, chitosan, poly(N-isopropylacrylamide) and Matrigel.
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Affiliation(s)
- Malgosia M Pakulska
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, ON M5S 3E5, Canada
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