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Resumo(s)
There is growing interest in the development of biodegradable packaging materials containing natural antioxidant
extracts. In this sense, the use of extracts obtained from agro-industrial byproducts has proved to
be a sustainable alternative. In this study, Pinhão extract, a byproduct of Pinhão (Araucaria angustifolia
(Bertol.) Kuntze) seed consumption, was characterized by HPLC-DAD-ESI/MSn, demonstrating the presence
of eight phenolic compounds, (+)-catechin and (−)-epicatechin being the most abundant molecules.
TPS/PBAT films containing Pinhão extract were produced by blown extrusion and their properties (tensile
properties, thermal characteristics and microstructure) were evaluated in order to determine the effect of
the presence of extracts. Results suggested that the interaction between the phenolic compounds of the
extract and the polymeric matrix caused the reduction in the crystallinity degree, and an increase in the
starch glass transition temperature. The presence of Araucaria angustifolia (Bertol.) Kuntze extract significantly
(p < 0.05) affected the color and opacity of the film. Regarding water vapor permeation, no significant
difference (p > 0.05) was detected. However, the water solubility and the contact angle with water
(polar solvent) and diiodomethane (non-polar solvent) significantly changed due to the extract addition.
Moreover, the Pinhão extract conferred significant antioxidant capacity to the TPS/PBAT films as determined
by DPPH, suggesting that this material can be applied as an active packaging material.
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Citação
Silva, Tamires Barlati Vieira da; Moreira, Thaysa Fernandes Moya; Oliveira, Anielle de; Bilck, Ana Paula; Gonçalves, Odinei Hess; Ferreira, Isabel C.F.R.; Barros, Lillian; Barreiro, M.F.; Yamashita, Fabio; Shirai, Marianne Ayumi; Leimann, Fernanda Vitória (2019). Araucaria angustifolia (Bertol.) Kuntze extract as a source of phenolic compounds in TPS/PBAT active films. Food and Function. ISSN 2042-6496. 10:12, p. 7697-7706