1 Composição físico-químicas de cookies adicionados de resíduos do arroz vermelho Physicochemical composition of cookies added from red rice waste Composición físico-química de galletas añadidas a partir de residuos de arroz rojo Resumo O presente artigo tem como objetivo obter a farinha do resíduos do arroz vermelho (FRAV) e aplicar na elaboração um biscoito tipo cookie, além de caracterizar e avaliar o efeito da adição desta farinha sobre as suas características físico-químicas. O resíduo do arroz vermelho foi obtido na extração do amido sendo submetido ao processo de secagem a 50 °C por 8h e caracterizado quanto aos parâmetros físico-químicos e de compostos bioativos. Os biscoitos foram elaborados em 3 formulações (0, 50 e 100%) de farinha do resíduo do arroz vermelho, sendo determinado a sua composição físico-química. A farinha do resíduo do arroz vermelho (FRAV) apresentou baixo teor de umidade e atividade de água, além disso, também apresenta elevados teores de compostos fenólicos totais e atividade antioxidante. A adição da farinha do resíduo do arroz vermelho na elaboração dos biscoitos tipo cookies proporcionou uma redução nos valores de umidade, atividade de água, cinzas, lipídeos e pH; e aumento nos valores de proteínas, fibras e carboidratos apresentando características adequadas ao consumo. Palavras-chave: Antocianinas; Compostos fenólicos; Produtos de panificação. AbstractThe present article has as objective obtain the red rice residue flour (FRAV) and to apply in the elaboration a cookie type cookie, besides to characterize and to evaluate the effect of the addition of this flour on its physicochemical characteristics. The red rice residue was obtained in the extraction of the starch and was submitted to the drying process at 50 °C for 8h and
The present article aims to produce and evaluate the differential particle size profile of jabuticaba bark flour. The flour of the jabuticaba bark was obtained through the convective drying process, performed in an air circulation oven at a temperature of 50 °C and a speed of 1.0 m/s for 24 h. The particle size analysis was performed by sieving 50 g of jabuticaba bark flour, using a series of standardized sieves in the range of 9 to 200 mesh. The mathematical models adjusted to the experimental data were Gates-Gaudin-Schuhmann (GGS) and Rosin-Rammler-Bennet Model (RRB). From the experimental data obtained it was verified that the flour of the jabuticaba bark analyzed is in accordance with the criteria of the legislation for granulometric classification. Among the applied mathematical models, the Rosin-Rammler-Bennet (RRB) model was the best fit to the experimental data with coefficient of determination (R2) greater than 0.99, and also presenting the highest inclination angle of the line. It is noteworthy that the average diameter of the particles obtained for fine flour did not differ from the value found experimentally. And that 27.62% for a total of 50 grams of flour had a fine grain size, less than 60 mesh, which is expected and satisfactory for flour characteristics, presenting potential for use in the development of new food products.
This work reports the evaluation of the microstructure, morphology, and catalytic behavior of α-Al 2 O 3 synthesized via combustion method for esterification reaction of oleic acid in soybean oil with ethanol to produce biodiesel. The reaction was evaluated with 2 wt% of catalyst at 160 °C for 3 h when the molar ratio of fatty acid:ethanol was 1:12. To enhance the catalytic performance of α-Al 2 O 3 , its sulfation was done by a different method using mechanical milling. The microcatalysts were characterized by X-ray diffraction, Fourie transform infrared spectroscopy, granulometric analysis, and scanning electron microscopy. Results showed α-Al 2 O 3 as the major phase, presence of SO 4 2groups, the contribution of the sulfation process to morphology with reduction of agglomerates, and particle size from 18.98 to 15.30 mm. The yield of ester was enhanced from 80% (α-Al 2 O 3 as a catalyst) to 93% (SO 4 2-/α-Al 2 O 3 as a catalyst), which showed the milling as a fast method for synthesis of a highly efficient acid catalyst to produce biodiesel.
da UFCG. Atua no desenvolvimento de novos materiais via síntese química, atividades relacionadas à nanotecnologia e desenvolvimento de materiais para aplicação em eletro-eletrônica, catálise, materiais magnéticos, ópticos, nanocompósitos, biomateriais, membranas cerâmicas e marcadores biológicos. Possui experiência em síntese e caracterização de materiais, desenvolvimento de materiais magnéticos para aplicações em catálise, absorvedores de radiação eletromagnética, marcadores biológicos e dispositivos magnéticos moles. Participa como membro permanente do Programa de Pós-Graduação em Ciências e Engenharia de Materiais (conceito CAPES 5). Também atua na formação de recursos humanos participando ativamente dos programas de
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