In the present study, a cassava starch‐glycerol film with reinforcement of Pinus sp. nanofibers (NFC) incorporated with tea tree (Melaleuca alternifolia) essential oil (TTO) were prepared by casting technique. The physical (barrier, mechanical, and optical), structural, and antimicrobial properties of the films were evaluated and compared with the control films. Films with 0.08% TTO exhibited a significant increase in the tensile strength (TS) while films with 1.5% TTO showed a decrease in TS, suggesting a crosslinking effect. The addition of 1.5% TTO reduced the water vapor permeability values in 43% comparing to the control films. Analysis obtained by Fourier transform infrared spectroscopy showed bands related to the interaction between TTO and matrix for films with 1.5% TTO and 0.3% NFC. This film was effective against Staphylococcus aureus and Candida albicans which could be applied for several packaging purposes. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48726.
Films based on rice flour were optimized using varying concentrations of guabiroba pulp (0–20%). After production using casting techniques, the films were subsequently characterized and compared to the control film. It was observed that the addition of guabiroba pulp enhanced the mechanical, optical, and water vapor barrier properties of the obtained films. Scanning electron microscopy and Fourier‐transform infrared spectroscopy tests indicated a good dispersion and interaction of the guabiroba pulp with the rice flour polymer matrix. Guabiroba pulp can therefore be used as a reinforcing additive in edible food packaging, among other purposes.
Resumo-Diversos materiais são utilizados para a produção de embalagens na indústria alimentícia. Contudo, na atualidade tem se aumentado as preocupações ambientais, e é crescente o interesse por embalagens biodegradáveis derivadas de fontes renováveis. Neste sentido, este estudo tem como objetivo produzir e caracterizar filmes à base de farinha de arroz e guabiroba. Foram produzidos filmes com diferentes concentrações de guabiroba (0-20%) por meio da técnica de casting, e realizadas análises de espessura, solubilidade e permeabilidade ao vapor de água (PVA). Todas as formulações propostas apresentaram bons filmes, com espessuras entre 0,150 a 0,231 mm, solubilidade média de 20,54%, valor acima do filme controle (14,64%). A PVA das amostras contendo guabiroba também obtiveram um acréscimo quando comparada ao filme controle (0,53 g/m.h.Pa para 4,75, 3,25 e 4,88 g/m.h.Pa),exceto para amostra contendo maior quantidade de polpa que reduziu o valor (0,53 g/m.h.Pa para 0,31 g/m.h.Pa. Esses valores despertam o interesse na investigação da utilização da farinha de arroz e guabiroba como matéria-prima para filmes biodegradáveis. Palavras-chave: biodegradável, comestível, espessura, solubilidade, permeabilidade ao vapor de água.
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