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URI permanente para esta coleçãohttps://rigalileo.itegam.org.br/handle/123456789/174

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Assunto: search.filters.subject.Amido

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Agora exibindo 1 - 2 de 2
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    Influência da variação de grãos de amido de arroz, mandioca e milho nas propriedades físicas, mecânicas e de fotodegradação de amido termoplástico
    (Instituto de Tecnologia, 2018) CRUZ, Isabela Cristina Rodrigues da; Edinaldo José de Sousa Cunha
    Starch has gained increasing interest as a biodegradable plastic due to its abundance, renewability, and low cost. Different types of starch grains form thermoplastics with varied physico-mechanical properties. This study analyzes the influence of different starch grains (rice, manioc, and corn) in biofilm production. Films were prepared by plasticization with glycerol in an aqueous medium at 100°C for 30 minutes and characterized by physical-chemical analysis, scanning electron microscopy (SEM), X-ray diffraction (XRD), optical microscopy, thermal analysis (TG/DTG), and mechanical tests. The results show that the geometry of the grains and the amylose/amylopectin ratio influence biofilm properties, affecting solubility, gelatinization time, and mechanical stability after radiation exposure.
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    Efeitos de Açúcares Extraídos de Raízes da Mandiocaba como Co-Plastificantes Glicerol/Mandioca e Glicerol/Mandiocaba
    (Instituto de Tecnologia, 2018) CHAVES, Lilia Eliza Monteiro; CUNHA, Edinaldo José de Sousa
    The effects of a Low Concentration Sugar Solution (SBCA), extracted from the mandiocaba bag in natura, as co-plasticizers in combination with glycerol were investigated for the production of thermoplastic starch (TPS) by the casting method, from the starch of mandiocaba and commercial cassava starch. The results were compared to the TPSs produced with water and glycerol, also investigated. Glycerol was reduced to 50% and 25%, substituting water for SBCA. Samples were analyzed by X-ray diffraction (XRD) after 15 days of aging, scanning electron microscopy (SEM), tensile strength (RT), elongation at break (ER), and water vapor permeability (PVA). The results showed that mandiocaba TPSs with SBCA decreased PVA to 90.2%; RT increased on average up to 7.72 times more; ER decreased by 13.4%; SEM showed voids caused by the reduction of glycerol and the use of SBCA​