No abstract

No abstract

ResumoO óleo de baru (OB) é uma matéria-prima renovável proveniente do cerrado brasileiro que possui elevado percentual de insaturação. O objetivo principal do trabalho foi o estudo das espumas de poliuretano com diferentes quantidade de óleo de baru saponificado. Os espectros de FTIR mostraram bandas representativas do poliol, óleo de baru e do pré-polímero. As curvas TG-DSC nas atmosferas de ar e N 2 apresentaram perfis diferentes, devido a formação de produtos intermediários de oxidação dos materiais na atmosfera de ar. A quantidade de energia liberada pela DSC e as perdas de massa observadas pelas curvas TG indicaram saturação do óleo de baru na quantidade de 24,00% (m/m). Os gases liberados analisados por TG-DSC acoplado ao FTIR, foram: água, CO 2 , CO e etanol. Com o aumento do óleo de baru, ocorreu maior absorção de água pelo PU, na proporção de 29,00% (m/m) o índice de intumescimento foi de 91,10%, em 1440 minutos. Assim, pudemos observer a formação do poliuretano com características distintas devido a presença do OB. Palavras-chave: poliuretano, óleo de baru, TG/DSC, FTIR. AbstractThe baru oil (OB) is a renewable raw material from the brazilian cerrado, with high unsaturation percentage. The objective of this work was the study of polyurethane foam with different quantities of baru saponified oil. FTIR spectrum showed the bands of polyol, baru oil and prepolymer. The TG-DSC curves in N 2 and air indicated different profiles, especially the formation of more stable intermediate products on the oxidation of these materials in air atmosphere. The quantity of heat obtained by DSC curves and the weight loss obtained by TG curve, indicates an OB saturation at 24.00% (w/w). The study by FTIR of the volatile products released by TG-DSC were water, CO 2 , CO and etanol. With the increase of OB, higher water absorption of PU, in 29.00% (w/w) of swelling index 91.10% for 1440 minutes. From these results, we observe the formation of polyurethane with different characteristics because of OB presence.

The addition of values to native fruits through studies that enable the various ways of harnessing them becomes an important strategy in the preservation process. In this sense the objective of this study was the physical and chemical characterization of the seed (peel, seeds, and pulp) as well as its oil derived from marolo fruit (Annona crassiflora Mart.) The analyses proximate composition, pH, titratable acidity, antioxidant activity, vitamin C concentration, total carotenoids, β–carotenes, iodine index, peroxide index, refraction, saponification, saponifiable matter, fatty acid profile, water activity, color, and rheology were studied. The peel of marolo seed was proved to be rich in carbohydrates, antioxidant substances and vitamin C. The seeds, in turn, presented high content of lipid, proteins and vitamin C. The oil extracted from marolo seed presented low refraction index, peroxides index, and unsaponifiable matter, besides a high content of vitamin C and unsaturated fatty acid compared with soybean oil, in addition to the presence of antioxidant compounds. Through the study, the feasibility of using by-products from processing of marolo seeds as a source of oils with high nutritional content was concluded.

No abstract