Efeito de biopolímeros usados em embalagens ativas para captura de Etileno
Data
2024-06-04
Autores
Dias, Saphire de Souza Lana 
Orientadores
Silva, Classius Ferreira
Tipo
Trabalho de conclusão de curso
Título da Revista
ISSN da Revista
Título de Volume
Resumo
Nos últimos anos as embalagens ativas vêm sendo desenvolvidas para serem mais eficazes no que diz respeito a preservação de frutos, prolongando o tempo de armazenamento e mantendo assim suas propriedades físicas e organolépticas. Este trabalho visou desenvolver um revestimento com material mais acessível e biodegradável como forma de substituição de materiais mais poluentes, como policloreto de vinila (PVC) e polietileno (PE) além de estudar os efeitos dos biopolímeros com adição zeólita e prata na captura de etileno, durante a maturação de bananas. O projeto foi dividido em cinco partes: (1) estudo do efeito da agitação no tamanho da partícula da zeólitas; (2) impregnação da zeólita com prata; (3) revestimento do papel Kraft com biopolímero/zeólita; (4) caracterização das zeólitas e dos papéis revestidos e (5) avaliação do desempenho dos papéis na vida de prateleira (shelf-life) de bananas. A impregnação da zeólita foi realizada em estufa de circulação de ar forçado. A zeólita foi adicionada à solução de biopolímero e espalhada sobre o papel para fazer o revestimento em uma única camada. Estes revestimentos foram caracterizados por técnicas analíticas como espectroscopia de infravermelho com transformada de Fourier (FTIR), calorimetria exploratória diferencial, termogravimetria. Em relação às propriedades físicas, foram utilizados os métodos já estabelecidos na literatura em normas regulamentadoras, como a gramatura, espessura, teste de absorção de água (Cobb) e rigidez Taber. Nas análises de shelf-life, variáveis como perda de massa, acidez titulável, absorção de água foram avaliadas no período de 24 dias. Os sistemas com os filmes revestidos foram comparados com sistema controle sem revestimento (filme SR) e sistema controle negativo (apenas bananas), os sistemas revestidos de amido com e sem prata foram os que mantiveram as bananas verdes por mais tempo. Estes resultados são promissores no sentido da elaboração de novas estratégias de frutos climatéricos, tais como a banana, pois os frutos são colhidos verdes e transportados por longas distancias, o que demanda cuidado para que os frutos não amadureçam precocemente, chegando ao destino deterioradas.
In recent years, active packaging has been developed to be more effective when it comes to preserving fruits, prolonging storage time, and thus maintaining their physical and organoleptic properties. This work aimed to develop a coating with a more accessible and biodegradable material as a way of replacing more polluting materials, such as polyvinyl chloride and polyethylene (PVC and PET), in addition to studying the effects of biopolymers with the addition of zeolite and silver on ethylene capture, during the ripening of bananas. The project was divided into five parts: (1) study of the effect of agitation on zeolite particle size; (2) impregnation of the zeolite with silver; (3) coating Kraft paper with biopolymer/zeolite; (4) characterization of zeolites and coated papers and (5) evaluation of paper performance in the shelf-life of bananas. Zeolite was added to the biopolymer solution and spread over the paper to make the coating in a single layer. These coatings were characterized by analytical techniques such as Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry, and thermogravimetry. Regarding physical properties, methods already established in the literature in regulatory standards were used, such as grammage, thickness, water absorption test (Cobb), and Taber stiffness. In shelf-life analyses, mass loss, titratable acidity, and water absorption were evaluated over 24 days. The systems with coated films were compared with a control system without coating (SR film) and a negative control system (bananas only). The starch-coated systems with and without silver were the ones that kept the bananas green for longer. These results are promising for developing new strategies for climacteric fruits, such as bananas, as the fruits are harvested unripe and transported over long distances, which requires care so that the fruits do not ripen prematurely, arriving at their destination deteriorate.
In recent years, active packaging has been developed to be more effective when it comes to preserving fruits, prolonging storage time, and thus maintaining their physical and organoleptic properties. This work aimed to develop a coating with a more accessible and biodegradable material as a way of replacing more polluting materials, such as polyvinyl chloride and polyethylene (PVC and PET), in addition to studying the effects of biopolymers with the addition of zeolite and silver on ethylene capture, during the ripening of bananas. The project was divided into five parts: (1) study of the effect of agitation on zeolite particle size; (2) impregnation of the zeolite with silver; (3) coating Kraft paper with biopolymer/zeolite; (4) characterization of zeolites and coated papers and (5) evaluation of paper performance in the shelf-life of bananas. Zeolite was added to the biopolymer solution and spread over the paper to make the coating in a single layer. These coatings were characterized by analytical techniques such as Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry, and thermogravimetry. Regarding physical properties, methods already established in the literature in regulatory standards were used, such as grammage, thickness, water absorption test (Cobb), and Taber stiffness. In shelf-life analyses, mass loss, titratable acidity, and water absorption were evaluated over 24 days. The systems with coated films were compared with a control system without coating (SR film) and a negative control system (bananas only). The starch-coated systems with and without silver were the ones that kept the bananas green for longer. These results are promising for developing new strategies for climacteric fruits, such as bananas, as the fruits are harvested unripe and transported over long distances, which requires care so that the fruits do not ripen prematurely, arriving at their destination deteriorate.