1
|
Reichenberg G, Ophir A, Nir Y. Functional film of ethylene vinyl acetate and co-polyamide compound containing “Nisin” active substance. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4477] [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]
Affiliation(s)
- Gilad Reichenberg
- Plastics Engineering Department; Shenkar College; 12 Anna Frank St. Ramat-Gan 52526 Israel
| | - Amos Ophir
- Plastics Engineering Department; Shenkar College; 12 Anna Frank St. Ramat-Gan 52526 Israel
| | - Yiftach Nir
- Plastics Engineering Department; Shenkar College; 12 Anna Frank St. Ramat-Gan 52526 Israel
| |
Collapse
|
2
|
Panou AI, Papadokostaki KG, Sanopoulou M. Release mechanisms of semipolar solutes from poly(dimethylsiloxane) elastomers: Effect of a hydrophilic additive. J Appl Polym Sci 2014. [DOI: 10.1002/app.40782] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Athanasia I. Panou
- Department of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems; National Center for Scientific Research; “Demokritos,” 15310 Ag. Paraskevi Athens Greece
| | - Kyriaki G. Papadokostaki
- Department of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems; National Center for Scientific Research; “Demokritos,” 15310 Ag. Paraskevi Athens Greece
| | - Merope Sanopoulou
- Department of Physical Chemistry, Institute of Advanced Materials, Physicochemical Processes, Nanotechnology and Microsystems; National Center for Scientific Research; “Demokritos,” 15310 Ag. Paraskevi Athens Greece
| |
Collapse
|
3
|
Babasola IO, Zhang W, Amsden BG. Osmotic pressure driven protein release from viscous liquid, hydrophobic polymers based on 5-ethylene ketal ε-caprolactone: Potential and mechanism. Eur J Pharm Biopharm 2013; 85:765-72. [DOI: 10.1016/j.ejpb.2013.04.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Revised: 04/05/2013] [Accepted: 04/10/2013] [Indexed: 11/16/2022]
|
4
|
Panou AI, Papadokostaki KG, Tarantili PA, Sanopoulou M. Effect of hydrophilic inclusions on PDMS crosslinking reaction and its interrelation with mechanical and water sorption properties of cured films. Eur Polym J 2013. [DOI: 10.1016/j.eurpolymj.2013.04.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
5
|
Strain-induced crack formations in PDMS/DXA drug collars. Acta Biomater 2013; 9:7335-42. [PMID: 23541599 DOI: 10.1016/j.actbio.2013.03.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Revised: 02/26/2013] [Accepted: 03/19/2013] [Indexed: 11/23/2022]
Abstract
Drug-eluting systems are currently used in cardiac leads in order to reduce inflammation and fibrosis at the lead-tissue interface. Drug release from these drug delivery systems can be modulated by the manufacturing processes used to create the drug systems and assemble them onto the cardiac lead. In this study, scanning electron microscopy, atomic force microscopy and Raman microscopy are employed to explore the material characteristics of a polydimethylsiloxane-dexamethasone acetate drug collar used on cardiac leads when varying the strain during collar assembly on the lead. A novel test fixture was created in order to investigate these drug collars under simulated stresses. Measurements of the collar while fitted to a rod revealed microcracks that are hypothesized to affect the drug release performance, resulting in increased drug elution. It was found that the strain that occurs during assembly of the collar onto the lead is a key factor in the formation of these microcracks. Results also suggest that cracks tend to form in areas of high drug particle density, and propagate between drug particles.
Collapse
|
6
|
Soulas DN, Sanopoulou M, Papadokostaki KG. Hydrophilic modification of silicone elastomer films: Thermal, mechanical and theophylline permeability properties. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:2122-30. [DOI: 10.1016/j.msec.2013.01.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2012] [Revised: 12/21/2012] [Accepted: 01/15/2013] [Indexed: 11/16/2022]
|
7
|
Soulas DN, Papadokostaki KG, Sanopoulou M. Silicone rubber films modified by ethylenoxy moieties: Characterization and drug delivery properties. J Appl Polym Sci 2013. [DOI: 10.1002/app.38711] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
8
|
Herrlich S, Spieth S, Messner S, Zengerle R. Osmotic micropumps for drug delivery. Adv Drug Deliv Rev 2012; 64:1617-27. [PMID: 22370615 DOI: 10.1016/j.addr.2012.02.003] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Accepted: 02/06/2012] [Indexed: 01/10/2023]
Abstract
This paper reviews miniaturized drug delivery systems applying osmotic principles for pumping. Osmotic micropumps require no electrical energy and consequently enable drug delivery systems of smallest size for a broad field of new applications. In contrast to common tablets, these pumps provide constant (zero-order) drug release rates. This facilitates systems for long term use not limited by gastrointestinal transit time and first-pass metabolism. The review focuses on parenteral routes of administration targeting drug delivery either in a site-specific or systemic way. Osmotic pumps consist of three building blocks: osmotic agent, solvent, and drug. This is used to categorize pumps into (i) single compartment systems using water from body fluids as solvent and the drug itself as the osmotic agent, (ii) two compartment systems employing a separate osmotic agent, and (iii) multi-compartment architectures employing solvent, drug and osmotic agent separately. In parallel to the micropumps, relevant applications and therapies are discussed.
Collapse
|
9
|
Petropoulos JH, Papadokostaki KG, Sanopoulou M. Higuchi's equation and beyond: overview of the formulation and application of a generalized model of drug release from polymeric matrices. Int J Pharm 2012; 437:178-91. [PMID: 22921377 DOI: 10.1016/j.ijpharm.2012.08.012] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Revised: 08/02/2012] [Accepted: 08/07/2012] [Indexed: 10/28/2022]
Abstract
An account is presented of modeling and experimental work, which complements, in many useful ways, the excellent coverage, afforded by a recent dedicated issue edited by Siepmann and Peppas (Int. J. Pharm. 2011, 418(1)), of the theoretical background and many ramifications, as well as practical applications, of the Higuchi equation. The main notable feature of the said modeling work is formulation and successful practical application, of an ab initio generalized approach, based on solving the fundamental transport equations applicable to the operation of typical matrix-controlled release (MCR) devices. This approach (i) reduces to the Higuchi equation under the pertinent restrictive conditions but can duly handle most of its more complex ramifications and (ii) can be parameterized (by the use of appropriate data from the literature or from independent experiments) to adapt itself to the physics of the particular matrix-solvent-solute system under consideration; as demonstrated here with examples from our laboratory or from the literature. A distinctive feature of the experimental work is the extensive use of simpler "model" MCR systems, chosen so as to promote better understanding of the effect of various physicochemical parameters and mechanisms on drug MCR rate and kinetics. A concept of MCR device efficiency is also discussed.
Collapse
Affiliation(s)
- John H Petropoulos
- Department of Physical Chemistry, IAMPPNM, National Center for Scientific Research Demokritos, GR-15310 Aghia Paraskevi, Athens, Greece.
| | | | | |
Collapse
|
10
|
Vasilakos SP, Tarantili PA. In vitrodrug release studies from organoclay/poly(dimethyl siloxane) nanocomposite matrices. J Biomed Mater Res B Appl Biomater 2012; 100:1899-910. [DOI: 10.1002/jbm.b.32757] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2011] [Revised: 05/30/2012] [Accepted: 06/02/2012] [Indexed: 11/10/2022]
|
11
|
Soulas DN, Papadokostaki KG, Panou A, Sanopoulou M. Drug Release from Poly(dimethylsiloxane)-Based Matrices: Observed and Predicted Stabilization of the Release Rate by Three-Layer Devices. Ind Eng Chem Res 2012. [DOI: 10.1021/ie300540x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dimitrios N. Soulas
- Institute of Physical Chemistry, National Centre for Scientific Research “Demokritos”, 15310 Ag. Paraskevi Attikis, Athens, Greece
| | - Kyriaki G. Papadokostaki
- Institute of Physical Chemistry, National Centre for Scientific Research “Demokritos”, 15310 Ag. Paraskevi Attikis, Athens, Greece
| | - Athanasia Panou
- Institute of Physical Chemistry, National Centre for Scientific Research “Demokritos”, 15310 Ag. Paraskevi Attikis, Athens, Greece
| | - Merope Sanopoulou
- Institute of Physical Chemistry, National Centre for Scientific Research “Demokritos”, 15310 Ag. Paraskevi Attikis, Athens, Greece
| |
Collapse
|
12
|
Proxyphylline release kinetics from symmetrical three-layer silicone rubber matrices: Effect of different excipients in the outer rate-controlling layers. Int J Pharm 2012; 427:192-200. [DOI: 10.1016/j.ijpharm.2012.01.056] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Revised: 01/25/2012] [Accepted: 01/27/2012] [Indexed: 11/19/2022]
|
13
|
Manoli K, Oikonomou P, Valamontes E, Raptis I, Sanopoulou M. Polymer-BaTiO3 composites: Dielectric constant and vapor sensing properties in chemocapacitor applications. J Appl Polym Sci 2012. [DOI: 10.1002/app.35362] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
14
|
Oliveira G, Beezer AE, Hadgraft J, Lane ME. Alcohol enhanced permeation in model membranes. Part II. Thermodynamic analysis of membrane partitioning. Int J Pharm 2011; 420:216-22. [PMID: 21896320 DOI: 10.1016/j.ijpharm.2011.08.037] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2011] [Revised: 08/21/2011] [Accepted: 08/22/2011] [Indexed: 11/26/2022]
Abstract
The role of solvents in drug transport has not been properly addressed in the literature, despite its well known influence on drug permeation. Previously we have conducted thermodynamic and kinetic analyses to probe the molecular mechanisms of alcohol enhanced permeation. In the present study, the influence of temperature on the partitioning of methyl paraben into silicone membranes is investigated. In line with previous membrane transport studies of methyl paraben in silicone membranes, butanol and heptanol are used as representative alcohols. The results show higher amounts of methyl paraben extracted from the silicone membrane following equilibration with butanol, at all experimental temperatures. This was in line with alcohol uptake data. In fact, a linear correlation (r(2) ∼0.97) was found between the amount of methyl paraben in the silicone membrane and the corresponding alcohol uptake. Calculated "specific" vehicle-membrane partition coefficients for both alcohols were approximately one, suggesting that the effective concentrations of methyl paraben inside and outside the membrane were the same. Thermodynamic analysis of the alcohol-membrane partition coefficients as a function of temperature showed no apparent trend for butanol, with an associated enthalpy change of approximately zero. Conversely, there was a positive trend in the van't Hoff plot for methyl paraben in heptanol, indicative of an exothermic process. Moreover, the partitioning trends of methyl paraben in silicone membranes obtained from membrane transport and equilibrium experiments were not the same. This reflects the fundamental differences between the calculated vehicle-membrane partition coefficients in the two studies. Finally, the findings from membrane transport and equilibrium experiments support a model of alcohol enhanced permeation where high solvent sorption promotes high solute concentrations in the overall volume of the membrane (i.e. K), thus leading to modified solute transport (i.e. increased flux). The same model also accounts for changes in membrane diffusivity (i.e. D) related to the properties of the imbibed alcohol.
Collapse
Affiliation(s)
- Gabriela Oliveira
- Department of Pharmaceutics, School of Pharmacy, 29-39 Brunswick Square, London WC1N 1AX, United Kingdom
| | | | | | | |
Collapse
|
15
|
Regulation of proxyphylline's release from silicone rubber matrices by the use of osmotically active excipients and a multi-layer system. Int J Pharm 2011; 408:120-9. [DOI: 10.1016/j.ijpharm.2011.02.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Revised: 01/12/2011] [Accepted: 02/09/2011] [Indexed: 11/24/2022]
|
16
|
Soulas D, Sanopoulou M, Papadokostaki K. Performance of three-layer controlled release devices with uniform or non-uniform material properties: Experiment and computer simulation. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2010.12.049] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
17
|
Valenzuela LM, Michniak B, Kohn J. Variability of water uptake studies of biomedical polymers. J Appl Polym Sci 2011. [DOI: 10.1002/app.33485] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
18
|
Soulas DN, Papadokostaki KG. Experimental investigation of the release mechanism of proxyphylline from silicone rubber matrices. J Appl Polym Sci 2010. [DOI: 10.1002/app.33055] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|