1
|
|
2
|
Racovita S, Vasiliu AL, Bele A, Schwarz D, Steinbach C, Boldt R, Schwarz S, Mihai M. Complex calcium carbonate/polymer microparticles as carriers for aminoglycoside antibiotics. RSC Adv 2018; 8:23274-23283. [PMID: 35540166 PMCID: PMC9081743 DOI: 10.1039/c8ra03367f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 06/13/2018] [Indexed: 11/22/2022] Open
Abstract
Composite microparticles of CaCO3 and two pectin samples (which differ by the functional group ratio) or corresponding nonstoichiometric polyelectrolyte complexes with different molar ratios (0.5, 0.9 and 1.2) are obtained, characterized and tested for loading and release of streptomycin and kanamycin sulphate. The synthesized carriers were characterized before and after drug loading in terms of morphology (by SEM using secondary electron and energy selective backscattered electron detectors), porosity (by water sorption isotherms) and elemental composition (by elemental mapping using energy dispersive X-ray and FTIR spectroscopy). The kinetics of the release mechanism from the microparticles was investigated using Higuchi and Korsmeyer–Peppas mathematical models. Self-assembled microparticles of CaCO3 and pectin/polyelectrolyte complexes as carriers for streptomycin and kanamycin sulfates by transformation into calcium phosphates.![]()
Collapse
Affiliation(s)
- Stefania Racovita
- “Petru Poni” Institute of Macromolecular Chemistry of Romanian Academy
- 700487 Iasi
- Romania
| | - Ana-Lavinia Vasiliu
- “Petru Poni” Institute of Macromolecular Chemistry of Romanian Academy
- 700487 Iasi
- Romania
| | - Adrian Bele
- “Petru Poni” Institute of Macromolecular Chemistry of Romanian Academy
- 700487 Iasi
- Romania
| | - Dana Schwarz
- Leibniz-Institut für Polymerforschung Dresden e.V
- 01069 Dresden
- Germany
| | | | - Regine Boldt
- Leibniz-Institut für Polymerforschung Dresden e.V
- 01069 Dresden
- Germany
| | - Simona Schwarz
- Leibniz-Institut für Polymerforschung Dresden e.V
- 01069 Dresden
- Germany
| | - Marcela Mihai
- “Petru Poni” Institute of Macromolecular Chemistry of Romanian Academy
- 700487 Iasi
- Romania
| |
Collapse
|
3
|
Guterres SS, Alves MP, Pohlmann AR. Polymeric Nanoparticles, Nanospheres and Nanocapsules, for Cutaneous Applications. Drug Target Insights 2017. [DOI: 10.1177/117739280700200002] [Citation(s) in RCA: 256] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Sílvia S. Guterres
- Programa de Póos-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, UFRGS, Porto Alegre, RS, Brazil
| | - Marta P. Alves
- Programa de Póos-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul, UFRGS, Porto Alegre, RS, Brazil
| | - Adriana R. Pohlmann
- Departamento de Química Orgânica, Instituto de Química, UFRGS, Porto Alegre, RS, Brazil
| |
Collapse
|
4
|
Mihai M, Racovita S, Vasiliu AL, Doroftei F, Barbu-Mic C, Schwarz S, Steinbach C, Simon F. Autotemplate Microcapsules of CaCO 3/Pectin and Nonstoichiometric Complexes as Sustained Tetracycline Hydrochloride Delivery Carriers. ACS APPLIED MATERIALS & INTERFACES 2017; 9:37264-37278. [PMID: 28972729 DOI: 10.1021/acsami.7b09333] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
New types of composites were obtained by an autotemplate method for assembling hollow CaCO3 capsules by using pH-sensitive polymers. Five pectin samples, which differ in the methylation degree and/or amide content, and some nonstoichiometric polyelectrolyte complex dispersions, prepared with the pectin samples and poly(allylamine hydrochloride), were used to control the crystal growth. The morphology of the composites was investigated by scanning electron microscopy, and the polymorphs characteristics were investigated by FTIR spectroscopy. The presence of the polymer in the composite particles was evidenced by X-ray photoelectron spectroscopy, particle charge density, and zeta-potential. The new CaCO3/pectin hollow capsules were tested as a possible matrix for a tetracycline hydrochloride carrier. The kinetics of the drug release mechanism was followed using Higuchi and Korsmeyer-Peppas mathematical models.
Collapse
Affiliation(s)
- Marcela Mihai
- "Petru Poni" Institute of Macromolecular Chemistry of Romanian Academy , 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Stefania Racovita
- "Petru Poni" Institute of Macromolecular Chemistry of Romanian Academy , 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Ana-Lavinia Vasiliu
- "Petru Poni" Institute of Macromolecular Chemistry of Romanian Academy , 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Florica Doroftei
- "Petru Poni" Institute of Macromolecular Chemistry of Romanian Academy , 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Cristian Barbu-Mic
- "Petru Poni" Institute of Macromolecular Chemistry of Romanian Academy , 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Simona Schwarz
- Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Straße 6, D-01069 Dresden, Germany
| | - Christine Steinbach
- Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Straße 6, D-01069 Dresden, Germany
| | - Frank Simon
- Leibniz-Institut für Polymerforschung Dresden e.V. , Hohe Straße 6, D-01069 Dresden, Germany
| |
Collapse
|
5
|
Tondwal R, Singh M. Effect of increasing alkyl chain of 1st tier dendrimers on binding and release activities of methotrexate drug: An in vitro study. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.07.033] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
6
|
Olkhov AA, Markin VS, Kosenko RY, Gol’dshtrakh MA, Iordanskii AL. Influence of the film forming procedure on the interaction in polyhydroxybutyrate-polyurethane blends. RUSS J APPL CHEM+ 2015. [DOI: 10.1134/s1070427215020196] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
7
|
Abstract
The current regimen of chemotherapy is far from satisfactory--its efficiency is limited and patients suffer from serious side effects. Various drug delivery devices have been under intensive investigation in the past few decades in attempts to develop controlled and targeted methods of chemotherapy administration. This article reviews the latest developments in nanoparticles of biodegradable polymers for chemotherapy of cancer and other diseases such as cardiovascular restenosis. The preliminary results obtained in the author's laboratory are used to demonstrate the concept. This review is written with the belief that engineering, in particular, chemical engineering principles, can be applied and further developed to solve the problems in the current practice of chemotherapy and promote a new concept of chemotherapy - chemotherapy at home.
Collapse
Affiliation(s)
- Si-Shen Feng
- Department of Chemical and Biomolecular Engineering, Faculty of Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260.
| |
Collapse
|
8
|
|
9
|
Nemati P, Imani M, Farahmandghavi F, Mirzadeh H, Marzban-Rad E, Nasrabadi AM. Dexamethasone-releasing cochlear implant coatings: application of artificial neural networks for modelling of formulation parameters and drug release profile. J Pharm Pharmacol 2013; 65:1145-57. [DOI: 10.1111/jphp.12086] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Accepted: 04/24/2013] [Indexed: 11/29/2022]
Abstract
Abstract
Objectives
Over the past few decades, mathematical modelling and simulation of drug delivery systems has been steadily gained interest as a focus for academic and industrial attention. Here, simulation of dexamethasone (DEX, a corticosteroid anti-inflammatory agent) release profile from drug-eluting cochlear implant coatings is reported using artificial neural networks.
Methods
The devices were fabricated as monolithic dispersions of the pharmaceutically active ingredient in a silicone rubber matrix. A two-phase exponential model was fitted on the experimentally obtained DEX release profiles. An artificial neural network (ANN) was trained to determine formulation parameters (i.e. DEX loading percentage, the devices surface area and their geometry) for a specific experimentally obtained drug release profile. In a reverse strategy, an ANN was trained for determining expected drug release profiles for the same set of formulation parameters.
Key findings
An algorithm was developed by combining the two previously developed ANNs in a serial manner, and this was successfully used for simulating the developed drug-eluting cochlear implant coatings. The models were validated by a leave-one-out method and performing new experiments.
Conclusions
The developed ANN algorithms were capable to bilaterally predict drug release profile for a known set of formulation parameters or find out the levels for input formulation parameters to obtain a desired DEX release profile.
Collapse
Affiliation(s)
- Pedram Nemati
- Novel Drug Delivery Systems Department, Iran Polymer and Petrochemical Institute, Tehran, Iran
| | - Mohammad Imani
- Novel Drug Delivery Systems Department, Iran Polymer and Petrochemical Institute, Tehran, Iran
| | - Farhid Farahmandghavi
- Novel Drug Delivery Systems Department, Iran Polymer and Petrochemical Institute, Tehran, Iran
| | - Hamid Mirzadeh
- Department of Polymer Engineering, Amirkabir University of Technology, Tehran, Iran
| | - Ehsan Marzban-Rad
- Ceramics Department, Materials and Energy Research Center, Tehran, Iran
| | - Ali Motie Nasrabadi
- Department of Biomedical Engineering, Faculty of Engineering, Shahed University, Tehran, Iran
| |
Collapse
|
10
|
Cao J, Xiu KM, Zhu K, Chen YW, Luo XL. Copolymer nanoparticles composed of sulfobetaine and poly(ε-caprolactone) as novel anticancer drug carriers. J Biomed Mater Res A 2012; 100:2079-87. [PMID: 22581715 DOI: 10.1002/jbm.a.34120] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Revised: 02/02/2012] [Accepted: 02/03/2012] [Indexed: 11/09/2022]
Abstract
Novel ABA type amphiphilic copolymers (PCL-APS-PCL) consisting of polycaprolactone (PCL) (A) as hydrophobic block and N,N'-bis (2-hydroxyethyl) methylamine ammonium propane sulfonate (APS) (B) as hydrophilic segment, self-assembled into nanoparticles (NPs) with solvent evaporation method. The sizes and size distributions of NPs were characterized by dynamic light scattering. The morphology of NPs was observed by scanning electron microscopy (SEM). The critical micelle concentration (CMC) was determined by fluorescent probe. The drug loading content (DLC) and the drug release amount were characterized by UV-visible spectrophotometer. The cytotoxicity of the NPs was measured by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenylte-trazoliumbromide (MTT) assay. It was found that the NPs were spherical in shape with sizes around 100 nm. The CMCs of the copolymers were quite low (×10(-4) mg/mL). The DLC decreased with lengthening of hydrophobic PCL block. In vitro drug release experiment demonstrated that the release rate of paclitaxel sped with the decrease of PCL length. MTT results showed that NPs were nontoxic to osteoblast and human epithelial carcinoma (hela) cells. After drug loading, NPs could restrain the growth of hela or even kill hela cells. Therefore, these preliminary studies suggest that the novel PCL-APS-PCL NPs have a great potential application as anticancer drug-delivery carriers.
Collapse
Affiliation(s)
- Jun Cao
- College of Polymer Science and Engineering of Sichuan University, Sichuan University, Sichuan 610065, People's Republic of China
| | | | | | | | | |
Collapse
|
11
|
Mishra V, Gupta U, Jain NK. Surface-Engineered Dendrimers: a Solution for Toxicity Issues. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 20:141-66. [DOI: 10.1163/156856208x386246] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Vijay Mishra
- a Pharmaceutics Research Laboratory, Department of Pharmaceutical Sciences, Dr. H. S. Gour University, Sagar (M.P.) 470003, India
| | - Umesh Gupta
- b Pharmaceutics Research Laboratory, Department of Pharmaceutical Sciences, Dr. H. S. Gour University, Sagar (M.P.) 470003, India
| | - N. K. Jain
- c Pharmaceutics Research Laboratory, Department of Pharmaceutical Sciences, Dr. H. S. Gour University, Sagar (M.P.) 470003, India
| |
Collapse
|
12
|
Kostova B, Momekova D, Petrov P, Momekov G, Toncheva-Moncheva N, Tsvetanov CB, Lambov N. Poly(ethoxytriethyleneglycol acrylate) cryogels as novel sustained drug release systems for oral application. POLYMER 2011. [DOI: 10.1016/j.polymer.2011.01.049] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
13
|
Orozco VH, Kozlovskaya V, Kharlampieva E, López BL, Tsukruk VV. Biodegradable self-reporting nanocomposite films of poly(lactic acid) nanoparticles engineered by layer-by-layer assembly. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.06.060] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
14
|
Hu BH, Su J, Messersmith PB. Hydrogels cross-linked by native chemical ligation. Biomacromolecules 2009; 10:2194-200. [PMID: 19601644 DOI: 10.1021/bm900366e] [Citation(s) in RCA: 92] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We describe the use of native chemical ligation (NCL) reaction to covalently cross-link soluble polymers into hydrogels. Macromonomers consisting of a four-armed poly(ethylene glycol) (PEG) core end-functionalized with either thioester or N-terminal cysteine peptide were designed and synthesized. Upon mixing aqueous solutions of the thioester and N-terminal cysteine macromonomers, rigid hydrogels formed within minutes. The gelation time was affected by choice of buffer, pH, polymer concentration, reaction temperature, and chemical composition of the N-terminal cysteine conjugate. The kinetics of gel formation and the viscoelastic behavior of selected hydrogels were further studied by oscillatory rheology, which demonstrated a minimum gel formation time of approximately two minutes and the formation of an elastic cross-linked hydrogel via the NCL reaction. A useful feature of this hydrogel strategy is the regeneration of thiol functional groups as a result of the NCL reaction, thereby allowing functionalization of the polymer hydrogel with biomolecules. This was demonstrated by conjugation of a maleimide-GRGDSPG-NH(2) peptide to an NCL hydrogel, permitting the attachment of human mesenchymal stem cells (hMSCs) on the hydrogel. Due to the mild reaction conditions, chemoselectivity, and potential for biological functionalization, our approach may prove useful as a general method for hydrogel formation, including hydrogels intended for biomedical applications.
Collapse
Affiliation(s)
- Bi-Huang Hu
- Biomedical Engineering Department, Northwestern University, Evanston, Illinois 60208, USA
| | | | | |
Collapse
|
15
|
Changerath R, Nair PD, Mathew S, Nair CPR. Poly(methyl methacrylate)-grafted chitosan microspheres for controlled release of ampicillin. J Biomed Mater Res B Appl Biomater 2009; 89:65-76. [DOI: 10.1002/jbm.b.31188] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
16
|
Martínez-Palau M, Franco L, Puiggalí J. Microspheres of new alternating copolyesters derived from glycolic acid units for controlled drug release. J Appl Polym Sci 2008. [DOI: 10.1002/app.28777] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
17
|
Vera M, Puiggalí J, Coudane J. Microspheres from new biodegradable poly(ester amide)s with different ratios ofL- andD-alanine for controlled drug delivery. J Microencapsul 2008; 23:686-97. [PMID: 17118884 DOI: 10.1080/02652040600787942] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
A series of biodegradable poly (ester amide)s composed of sebacic acid, dodecanediol and different ratios of the stereoisomers of L- and D-alanine were synthesized for applications in drug delivery systems. Microspheres loaded with diclofenac sodium salt, triclosan and clofazimine were prepared with the solvent evaporation technique. No influence of polymer constitution in the drug release rate was found in vitro and no degradation occurred during the period of drug release. It was shown that a sustained delivery of the hydrophilic diclofenac sodium salt in Sörensen media occurred and it was controlled by diffusion. However, exhaustion of microspheres was feasible only from the most porous matrices where channelling had an important contribution.
Collapse
Affiliation(s)
- M Vera
- Departament d'Enginyeria Química, Universitat Politècnica de Catalunya, Barcelona, Spain.
| | | | | |
Collapse
|
18
|
Kostova B, Kamenska E, Ivanov I, Momekov G, Rachev D, Georgiev G. Verapamil Hydrochloride Release Characteristics from New Copolymer Zwitterionic Matrix Tablets. Pharm Dev Technol 2008; 13:311-21. [DOI: 10.1080/10837450802089180] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
19
|
You JH, Choi SW, Kim JH, Kwak YT. Synthesis and microphase separation of biodegradable poly(ε-caprolactone)-poly(ethylene glycol)-poly(ε-caprolactone) multiblock copolymer films. Macromol Res 2008. [DOI: 10.1007/bf03218568] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
20
|
Chausson M, Fluchère AS, Landreau E, Aguni Y, Chevalier Y, Hamaide T, Abdul-Malak N, Bonnet I. Block copolymers of the type poly(caprolactone)-b-poly(ethylene oxide) for the preparation and stabilization of nanoemulsions. Int J Pharm 2008; 362:153-62. [DOI: 10.1016/j.ijpharm.2008.06.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2008] [Revised: 06/04/2008] [Accepted: 06/07/2008] [Indexed: 11/25/2022]
|
21
|
Tan JPK, Wang Q, Tam KC. Control of burst release from nanogels via layer by layer assembly. J Control Release 2008; 128:248-54. [PMID: 18457895 DOI: 10.1016/j.jconrel.2008.03.012] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Revised: 03/04/2008] [Accepted: 03/10/2008] [Indexed: 01/28/2023]
Abstract
Undesirable burst release phenomenon is commonly encountered in nanostructured delivery systems, and should be addressed. The present study demonstrates a simple and practical way to reduce or minimize high burst release associated with nanoparticulate delivery systems. Drug loaded nanogels of size less than 200 nm were successfully coated with alternating layers of poly(allylamine hydrochloride) (PAH, cationic) and poly(sodium 4-styrenesulfonate) (PSS, anionic) polyelectrolytes. With every layer of polyelectrolyte, the radius increased by 2 nm, and the zeta-potential alternated between positive and negative values. PSS coated nanogels were stable at all pH, while PAH coated nanogels were only stable up to pH of 8. A drug selective electrode (DSE) was used to directly measure the concentration of procaine hydrochloride (PrHy) from MAA-EA coated nanogels. The high burst release was reduced or minimized when the number of layers of polyelectrolyte was increased. An empirical relationship describing the number of polyelectrolyte layers and time to attain steady-state drug concentration (tau(D)) was developed, where tau(D) increased with increasing polyelectrolyte layers.
Collapse
Affiliation(s)
- Jeremy P K Tan
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50, Nanyang Avenue, Singapore 639798, Singapore
| | | | | |
Collapse
|
22
|
Kang DY, Kim MJ, Kim ST, Oh KS, Yuk SH, Lee S. Size characterization of drug-loaded polymeric core/shell nanoparticles using asymmetrical flow field-flow fractionation. Anal Bioanal Chem 2008; 390:2183-8. [DOI: 10.1007/s00216-008-1984-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Revised: 02/12/2008] [Accepted: 02/14/2008] [Indexed: 11/29/2022]
|
23
|
Hill DJT, Whittaker AK. Mineralization of radiation-crosslinked polyvinyl alcohol/polyvinyl pyrrolidone hydrogels. J Biomed Mater Res A 2007; 83:354-61. [PMID: 17450575 DOI: 10.1002/jbm.a.31236] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A study of the calcification of the polyvinyl alcohol/polyvinyl pyrrolidone (PVA/PVP) hydrogels during their exposure to a calcium chloride solution or a simulated body fluid has been carried out. On the basis of the experiments, using a two-compartment permeation cell, the diffusion of calcium ions and their subsequent deposition in the hydrogels were elucidated. Steady-batch experiments were also performed to further elaborate the deposition pattern and the types of calcium deposits. It was demonstrated that Fick's second law of diffusion can describe the diffusion of calcium ions through PVA/PVP hydrogels at 310 K. The diffusion coefficient was determined to be (4.4+/-0.1)x10(-10) m2/s and the partition coefficient for the hydrogels was 0.06. Formation of calcium deposits was noticed taking place both on the surface and inside the hydrogels. The deposits formed on the surface have flake morphology, while the deposits inside the hydrogels are more like globular aggregates. Both types of deposits have been characterized as being comprised calcium and hydroxyl ion deficient apatites with chloride ions the most likely substituting species at the hydroxyl sites.
Collapse
|
24
|
Radhakumary C, Nair PD, Mathew S, Reghunadhan Nair CP. Synthesis, characterization, and properties of poly(vinyl acetate)- and poly(vinyl alcohol)-grafted chitosan. J Appl Polym Sci 2007. [DOI: 10.1002/app.25841] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
25
|
Simultaneous emulsification and interfacial polycondensation for the preparation of colloidal suspensions of nanocapsules. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2006. [DOI: 10.1016/j.msec.2005.10.022] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
26
|
Zhang Y, Zhuo RX. Synthesis and in vitro drug release behavior of amphiphilic triblock copolymer nanoparticles based on poly (ethylene glycol) and polycaprolactone. Biomaterials 2005; 26:6736-42. [PMID: 15935469 DOI: 10.1016/j.biomaterials.2005.03.045] [Citation(s) in RCA: 151] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2004] [Accepted: 03/31/2005] [Indexed: 11/25/2022]
Abstract
Novel BAB type amphiphilic triblock copolymers consisting of poly (ethylene glycol) (PEG) (B) as hydrophilic segment and poly (epsilon-caprolactone) (PCL) (A) as hydrophobic block were prepared by coupling reaction using L-lysine methyl ester diisocyanate (LDI) as the chain extender. The triblock copolymers obtained were characterized by FT-IR, 1H NMR, GPC, and DSC. Core-shell type nanoparticles were prepared by nanoprecipitation method and below 100 nm nanoparticles were obtained due to their specific structure. Transmission electron microscopy image demonstrated that these nanoparticles were spherical in shape. Stability of the nanoparticles in biological media was evaluated. Poorly water-soluble anticancer drug 4'-demethyl-epipodophyllotoxin (DMEP) was chosen for controlled drug release because it was easily encapsulated into polymeric nanoparticles via hydrophobic interaction. In vitro release behavior of DMEP from polymeric nanoparticles was investigated, the results showed that the drug release rate can be modulated by the variation of the copolymer composition.
Collapse
Affiliation(s)
- Ying Zhang
- Key Laboratory of Biomedical Polymers of the Ministry of Education, Department of Chemistry, Wuhan University, Wuhan 430072, PR China
| | | |
Collapse
|
27
|
Hu BH, Messersmith PB. Enzymatically cross-linked hydrogels and their adhesive strength to biosurfaces. Orthod Craniofac Res 2005; 8:145-9. [PMID: 16022716 DOI: 10.1111/j.1601-6343.2005.00330.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
OBJECTIVES To design an in-situ gelling hydrogel capable of solidifying rapidly under physiologic conditions into a hydrogel capable of adhering tissue surfaces together. DESIGN Multifunctional polymers containing covalently bound peptide substrates of transglutaminase were designed. EXPERIMENTAL VARIABLE Enzyme cross-linked hydrogels were compared with commercial fibrin tissue adhesive. OUTCOME MEASURE The shear strength between tissue surfaces or type 1 collagen membranes bonded with hydrogel was measured. RESULTS The shear adhesive strength of transglutaminase cross-linked hydrogels was found to be equal to or better than fibrin sealant for tissue and collagen surfaces, respectively. CONCLUSION Transglutaminase cross-linked hydrogels are injectable, in-situ formed, biodegradable, and expected to be useful in a variety of applications including sustained drug delivery, medical and dental adhesives, tissue repair and engineering as polymeric scaffolds, and gene therapy.
Collapse
Affiliation(s)
- B-H Hu
- Biomedical Engineering Department, Northwestern University, Evanston, IL 60208, USA
| | | |
Collapse
|
28
|
Comparison between the binding of chlorpheniramine maleate to poly(sodium 4-styrenesulfonate) and the binding to other polyelectrolytes. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.06.033] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
|
29
|
Ranade SV, Richard RE, Helmus MN. Styrenic block copolymers for biomaterial and drug delivery applications. Acta Biomater 2005; 1:137-44. [PMID: 16701787 DOI: 10.1016/j.actbio.2004.09.004] [Citation(s) in RCA: 91] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2004] [Revised: 09/02/2004] [Accepted: 09/03/2004] [Indexed: 11/17/2022]
Abstract
The use of styrenic block copolymers has undergone a renaissance as a biomaterial and drug delivery matrix. The early promise posed by the physical and biological properties of these block copolymers for implantable medical devices was not met. However, there has been an increased understanding of the role of microphase separation on the mediation of the biological response. Poly (styrene-b-isobutylene-b-styrene) (SIBS) block copolymer has critical enabling properties related to processing, vascular compatibility and bio-stability that has resulted in its use as the matrix for paclitaxel delivery from Boston Scientific's TAXUS coronary stent. These enabling properties will allow the continuing development of medical devices based on SIBS that meet demanding physical and biological requirements.
Collapse
Affiliation(s)
- Shrirang V Ranade
- Corporate Research and Advanced Technology Development, Boston Scientific Corporation, 1 Boston Scientific Place, Natick, MA 01760, USA.
| | | | | |
Collapse
|
30
|
Ranade SV, Miller KM, Richard RE, Chan AK, Allen MJ, Helmus MN. Physical characterization of controlled release of paclitaxel from the TAXUS? Express2? drug-eluting stent. ACTA ACUST UNITED AC 2004; 71:625-34. [PMID: 15514926 DOI: 10.1002/jbm.a.30188] [Citation(s) in RCA: 158] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The polymer carrier technology in the TAXUS drug-eluting stent consists of a thermoplastic elastomer poly(styrene-b-isobutylene-b-styrene) (SIBS) with microphase-separated morphology resulting in optimal properties for a drug-delivery stent coating. Comprehensive physical characterization of the stent coatings and cast film formulations showed that paclitaxel (PTx) exists primarily as discrete nanoparticles embedded in the SIBS matrix. Thermal and chemical analysis did not show any evidence of solubility of PTx in SIBS or of any molecular miscibility between PTx and SIBS. Atomic force microscope data images revealed for the first time three-dimensional stent coating surfaces at high spatial resolutions in air and in situ under phosphate-buffered saline as drug was released. PTx release involves the initial dissolution of drug particles from the PTx/SIBS coating surface. Morphological examination of the stent coatings in vitro supported an early burst release in most formulations because of surface PTx followed by a sustained slower release of PTx from the bulk coating. The in vitro PTx release kinetics were dependent on the formulation and correlated to the drug-to-polymer ratio. Atomic force microscopy analysis confirmed this correlation and further supported the concept of a matrix-based drug-release coating.
Collapse
Affiliation(s)
- Shrirang V Ranade
- Corporate Research & Advanced Technology Development, Boston Scientific Corporation, One Boston Scientific Place, Natick, Massachusetts 01760, USA.
| | | | | | | | | | | |
Collapse
|
31
|
Chemotherapeutic engineering: Application and further development of chemical engineering principles for chemotherapy of cancer and other diseases. Chem Eng Sci 2003. [DOI: 10.1016/s0009-2509(03)00234-3] [Citation(s) in RCA: 253] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
32
|
Aulenta F, Hayes W, Rannard S. Dendrimers: a new class of nanoscopic containers and delivery devices. Eur Polym J 2003. [DOI: 10.1016/s0014-3057(03)00100-9] [Citation(s) in RCA: 328] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
33
|
Flieger M, Kantorová M, Prell A, Rezanka T, Votruba J. Biodegradable plastics from renewable sources. Folia Microbiol (Praha) 2003; 48:27-44. [PMID: 12744074 DOI: 10.1007/bf02931273] [Citation(s) in RCA: 217] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Plastic waste disposal is a huge ecotechnological problem and one of the approaches to solving this problem is the development of biodegradable plastics. This review summarizes data on their use, biodegradability, commercial reliability and production from renewable resources. Some commercially successful biodegradable plastics are based on chemical synthesis (i.e. polyglycolic acid, polylactic acid, polycaprolactone, and polyvinyl alcohol). Others are products of microbial fermentations (i.e. polyesters and neutral polysaccharides) or are prepared from chemically modified natural products (e.g., starch, cellulose, chitin or soy protein).
Collapse
Affiliation(s)
- M Flieger
- Institute of Microbiology, Academy of Sciences of the Czech Republic, 142 20 Prague, Czechia
| | | | | | | | | |
Collapse
|