Thermoplastic starch/whey protein isolate/rosemary essential oil nanocomposites obtained by extrusion process: Antioxidant polymers |
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| Authors: | Viviane Machado Azevedo Raissa Alvarenga Carvalho Soraia Vilela Borges Pedro Ivo Cunha Claro Fernando Ken Hasegawa Maria Irene Yoshida José Manoel Marconcini |
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| Affiliation: | 1. Food Science Department, Federal University of Lavras (UFLA), Lavras, Minas Gerais 37200-000, Brazil;2. Program in Materials Science and Engineering (PPG-CEM), Federal University of São Carlos, São Carlos, São Paulo 13565-905, Brazil;3. Undergraduate Materials Engineering, Federal University of São Carlos, São Carlos, São Paulo 13565-905, Brazil;4. Chemistry Department, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais 31270-901, Brazil;5. Laboratory of National Nanotechnology of Agriculture (LNNA), Embrapa Instrumentação, São Carlos, São Paulo 13560-970, Brazil |
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| Abstract: | Active substances are added to polymers to act as a barrier to external elements, protecting the product. This article evaluated the effect of the addition of sodium montmorillonite (MMT) nanoparticles and the antioxidant activity of rosemary essential oil (EO) in thermoplastic starch/whey protein isolate (TPS/WPI) nanocomposites obtained by extrusion. X-ray diffractograms showed dispersion/exfoliation of the MMT in the TPS/WPI matrix. The nanocomposites presented rough surface with the presence of porosity as shown by scanning electron microscopy images. Thermogravimetric analysis revealed that the combination between MMT and rosemary EO increased thermal stability of nanocomposites. The addition of rosemary EO became the films less rigid, weaker and had an antioxidant effect as shown by mechanical properties and 2,2-diphenyl-1-picrylhydrazyl assay. The optical properties showed in opaque greenish yellow nanocomposites. Therefore, the addition of rosemary EO in nanocomposites showed an alternative for use as antioxidant polymers in packaging material. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47619. |
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| Keywords: | blends DPPH extrusion nanocomposites thermal stability |
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