Estudo visando à obtenção de novos plásticos biodegradáveis com propriedade antimicrobiana
Nowadays the utilization of plastic packages for the protection of food and your environmental impact in the degradation process are been largely investigated. In comparison, the natural polymers shows countless benefits over synthetic polymers, such as antimicrobial action, biodegradability and per...
| Autor principal: | Farias, Letícia Caroline Dubinski de |
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| Formato: | Trabalho de Conclusão de Curso (Graduação) |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2020
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/6143 |
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| Resumo: |
Nowadays the utilization of plastic packages for the protection of food and your environmental impact in the degradation process are been largely investigated. In comparison, the natural polymers shows countless benefits over synthetic polymers, such as antimicrobial action, biodegradability and permeability to gases. Films produced with natural polymers, for example, can be used for packages for protection of food for consumption, mainly in exportation process, that requires a larger attention by the long period to the final destination. In this context, the present study aimed to the synthesis, preparation and characterization of a new polymer based in natural products, eugenol and limonene, in order to produce biodegradable plastics with antimicrobial properties. In cationic polymerization reactions in the presence of aluminum chloride and toluene formed pasty substance with yellow coloring, after heating was reddish coloration, not forming the desire polymer. In photo polymerization method, requisition a camera photoreatora with medium pressure mercury lamp (250 W), the natural product (eugenol and limonene) and benzoyl peroxide has exposed to radiation for 96 hours, getting a formation of crystallized salts. In the polymerization, method by suspension has obtained gels that, in solubility tests, presented swelling capacity. In order to identify which polymer has the major potential for use as biofilms, films of a cellulose acetate and soluble starch were prepared with different grades of eugenol or limonene. Morphological properties of, storage, antimicrobial and the kinetics of release of natural products has investigated. The micrographs of films of cellulose acetate with eugenol, starch with eugenol or limonene, presented a smooth surface, indicating dense and uniform films. Cellulose acetate films containing limonene have porous morphology, due to phase separation, promoted by evaporation of the solvent. The application of starch films containing 5% (wt/wt) of natural product in apples, that has bathed or enveloped and stores for 15 days in incubator, allowing gauging the applicability of the material for food packaging. Apples enveloped with starch-eugenol have presented an oxidative profile; already the apples enveloped with starchlimonene have presented satisfactory results in the process of food conservation. Test that apples has submerged in filmogenic solution resulted in foods with better conservation and maintenance of sensory characteristics. The films obtained has evaluated for microbiological testing front bacteria Escherichia coli e Staphylococcus aureus. Average halos of drug control was 27,24 mm, already the cellulose acetate film in the presence of Staphylococcus aureus has formed a halo of 10,5 mm, while the film cellulose acetate containing eugenol in the presence of Escherichia Coli has formed a halo of 11,50 mm. A 10% concentration tests has performed only with Escherichia coli, with results of bigger halos, as expected, coming to 19, 93 mm for cellulose acetate containing eugenol film and 10, 8 mm o starch containing limonene film and 8, 06 mm for starch containing eugenol film. The results obtained indicate that cellulose acetate or starch polymers incorporated with eugenol or limonene can act as products that allow food shelf live, reducing the food oxidation rate and controlling the proliferation of microorganisms. |
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