Hydroxypropyl methylcellulose-TiO2 and gelatin-TiO2 nanocomposite films: Physicochemical and structural properties
| Autor: | Carlos Eduardo Maduro de Campos, Lenilton Santos Soares, Regina de Fátima Peralta Muniz Moreira, Marta Elisa Rosso Dotto, Alcilene Rodrigues Monteiro Fritz, Jéssica de Matos Fonseca, Germán Ayala Valencia |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
food.ingredient 02 engineering and technology engineering.material Biochemistry Gelatin 03 medical and health sciences Crystallinity chemistry.chemical_compound food Structural Biology Zeta potential Solubility Molecular Biology 030304 developmental biology 0303 health sciences Nanocomposite Aqueous solution General Medicine 021001 nanoscience & nanotechnology Chemical engineering chemistry Titanium dioxide engineering Biopolymer 0210 nano-technology |
| Zdroj: | International Journal of Biological Macromolecules. 151:944-956 |
| ISSN: | 0141-8130 |
| DOI: | 10.1016/j.ijbiomac.2019.11.082 |
| Popis: | Photocatalytic properties of titanium dioxide (TiO2) have been widely studied. However, its tendency to aggregation in biopolymer-based nanocomposites limits its application for food packaging and has been few studied. The aim of this work was to study the dispersion of TiO2 (0–2 wt%) incorporated in the hydroxypropyl methylcellulose (HPMC-TiO2) and gelatin (gelatin-TiO2) film forming solutions. Particle size and zeta potential of TiO2 nanoparticles were investigated. Nanocomposite films were characterized as to the thickness, moisture content, solubility, color, absorption to the light, relative opacity, morphology, chemical composition, crystallinity, thermal and mechanical properties and water vapor permeability (WVP). TiO2 nanoparticles showed better dispersion in acid medium than water. Moisture content, water solubility and WVP of the gelatin-TiO2 films were influenced by the incorporation of TiO2, while HPMC-TiO2 films were not. The increase of relative opacity of the films as TiO2 was more attenuated for the gelatin-TiO2 films due to lower TiO2 aggregation in gelatin. Morphology, chemical composition, crystallinity and thermal properties of the films evidenced that TiO2 was better dispersed in both matrices at 1 wt%. It was also concluded that TiO2 aggregation generated more biphasic regions in HPMC than generated in gelatin, which caused a microstructural reorganization in the matrices. |
| Databáze: | OpenAIRE |
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