Modificação enzimática da farinha de grãos quebrados de arroz para produção de alimento sem glúten
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2012-03-09
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Universidade Federal de Goiás
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The rice (Oryza sativa L.) is a cereal consumed worldwide, and the energy base of food, constituting about 23% of total daily calories and about 14% of the protein. The grains are broken rice by-products generated in the processing industry for the processing of rice and cereals have been used for the production of modified starch to be ideal source of low cost, easily obtainable and allows industrial production. The purpose of this study was to determine the enzymatic hydrolysis of grain flour broken rice flour to produce a modified with α-amylase and amyloglucosidase, and drying temperatures (40, 80, 100, 120 and 140 ° C) in its physical, chemical and technological. It also aimed to develop a product similar to flour gluten-free rice milk, by means of mixture design, using flour as components of broken grains of rice and dried enzymatically modified (FDM), milk powder and sugar. The analyzes in FDM were broken and composition, determination of reducing sugars, glucose, color coordinates, solubility and absorption in water and milk analysis and scanning electron microscopy. The enzymatic hydrolysis at 40 ° C was more efficient using 2U of α-amylase / g flour in time of 2 hours and 3U of amyloglucosidase / g of flour in the time of three hours of hydrolysis. The FDM at 40, 80 and 100 ° C showed a reducing sugar of 111.37, 108.15 and 116.04 mg / g of flour and glucose 83.20, 75.90 and 77.30 mg / g flour respectively, which are significantly higher than the grain flour fresh broken and the other drying temperatures tratamentos.As influence the composition of the FDM at different temperatures, an increase in lipid content with increasing drying temperature and changes in its structure. The FDM 40, 80 and 100 ° C had a content of reducing sugars, glucose, solubility in water and in milk significantly larger than the grain flour broken.The FDM from 100 ° C exhibited characteristics of a flour resistant to shear force, and stable to heating at lower temperatures. They also had a darker color with yellow tones and slightly red in the other treatments. The product similar to the rice flour milk was selected with the formulation 10% sugar, 31% milk powder and 59% of the FDM 100 ° C, and evaluated for composition and quality parameters. The formulation presented with sensory acceptance score of 7.95, good strength characteristics, technological characteristics as an index of solubility in water and milk, color coordinates and nutritional composition similar to milk commercial flour.
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FERREIRA, Suzane Martins. Enzymatic modification of grain flour broken rice to produce food without gluten. 2012. 169 f. Dissertação (Mestrado em Ciencias Agrárias - Agronomia) - Universidade Federal de Goiás, Goiania, 2012.