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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Dabóczi, Mátyás Albert, Emoke Agócs, Emil Kabai-Faix, Márta Hórvölgyi, Zoltán |
| Description | Country affiliation: Hungary Author Affiliation: Dabóczi M ( Budapest University of Technology and Economics, Department of Physical Chemistry and Materials Science, H-1521 Budapest, Hungary.); Albert E ( Budapest University of Technology and Economics, Department of Physical Chemistry and Materials Science, H-1521 Budapest, Hungary.); Agócs E ( Research Institute for Technical Physics and Material Science, Centre for Energy Research, Hungarian Academy of Sciences, H-1121 Budapest, Hungary.); Kabai-Faix M ( Budapest University of Technology and Economics, Department of Physical Chemistry and Materials Science, H-1521 Budapest, Hungary.); Hórvölgyi Z ( Budapest University of Technology and Economics, Department of Physical Chemistry and Materials Science, H-1521 Budapest, Hungary. Electronic address: zhorvolgyi@mail.bme.hu.) |
| Abstract | Chitosan and bilayered--Rhodamine 6G impregnated silica-chitosan--coatings (300-3000 nm thick) were prepared and investigated as a model for controlled drug release. Properties of native, ionically (sodium triphosphate) and covalently (glutaraldehyde) cross-linked layers of chitosan in contact with aqueous phase (modeling human blood pH of ca. 7.3) were investigated. The cross-linking was confirmed by attenuated total reflection (ATR) Fourier transform infrared (FTIR), energy-dispersive spectroscopy (EDS) and solid state (13)C nuclear magnetic resonance (NMR) spectroscopy. The evolution of advancing water contact angles as a function of time was measured, and from the results restricted mobility of polymer segments in the interfacial layer of cross-linked chitosan coatings were assumed. Spectroscopic ellipsometry measurements showed that covalent cross-linking leads to a lowered, while ionic cross-linking to an increased swelling degree of chitosan layers. Despite the swelling behavior both cross-linked chitosan layers showed significant retard effect on dye release from the bilayered coatings. |
| File Format | HTM / HTML |
| ISSN | 01448617 |
| Volume Number | 136 |
| e-ISSN | 18791344 |
| Journal | Carbohydrate Polymers |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2016-01-20 |
| Publisher Place | Great Britain (UK) |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Biochemistry__semicolon__materials Discipline Science Chitosan Chemistry Coloring Agents Drug Carriers Rhodamines Silicon Dioxide Delayed-action Preparations Humans Hydrogen-ion Concentration Permeability Porosity Water Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Materials Chemistry Polymers and Plastics |
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