Artigos Científicos - FEA/ITEC
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/3359
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Navegando Artigos Científicos - FEA/ITEC por Periódicos "Food Science and Technology"
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Item Acesso aberto (Open Access) Effect of adding fatty acids and surfactant on the functional properties of biodegradable films prepared with myofibrillar proteins from acoupa weakfish (cynoscion acoupa). Food science and technology(Universidade Federal do Pará, 2019-06) PEREIRA, Gleice Vasconcelos da Silva; PEREIRA, Glauce Vasconcelos da Silva; NEVES, Eleda Maria Paixão Xavier; JOELE, Maria Regina Sarkis Peixoto; LIMA, Consuelo Lúcia Sousa de; LOURENÇO, Lúcia de Fátima HenriquesThis research aimed to assess the properties of biodegradable films prepared with lyophilized myofibrillar proteins (LMP) from fish filleting residues, fatty acids (stearic, palmitic, and caproic), and surfactant (SLS). The films were characterized to assess the effects of adding those components. Adding fatty acids and SLS resulted in more flexible films with higher elongation values compared to the LMP film. The films prepared with 5% stearic acid and 10% SLS and with 10% palmitic acid and 20% SLS had higher tensile strength compared to the LMP film. Solubility reached 100% in the films added with 10% fatty acids with and without SLS. Increasing the concentration of fatty acids and SLS led to less transparent films. Microscopy analysis showed changes in the morphological structure of the films added with fatty acids and SLS, resulting in whitish films when greater SLS contents were used.Item Acesso aberto (Open Access) Optimization of parameters technological to process tucupi and study of product stability(Universidade Federal do Pará, 2019-06) CAMPOS, Ana Paula Rocha; MATTIETTO, Rafaella de Andrade; CARVALHO, Ana VâniaTucupi is a product obtained from the fermentation and cooking of cassava root wastewater which is widely used in the popular cuisine of the North region of Brazil. This study employed an experimental design to select tucupi processing (fermentation and cooking times) as a function of residual cyanidric acid content and assess the stability of the product obtained. Although the design did not generate a predictive mathematical model, the trend plots and physicochemical and sensory tests indicated 24 h of fermentation and 40 min of cooking as process parameters. The tucupi prepared had pH 3.71, titratable acidity of 0.7 g lactic acid/100 mL, 93.91% moisture, 0.5% ashes, 0.52% proteins, 0.24% lipids, 4.83% carbohydrates, total and free cyanide of 6.97 and 1.31 mg HCN/L, respectively. No Salmonella spp., coagulase-positive Staphylococcus, Bacillus cereus , or thermotolerant coliforms were observed, whereas counts of mesophilic aerobic bacteria (1.3x102 CFU/g) and molds and yeasts (1.3x102 CFU/g) were low. Over 50 days of follow-up (stored at 10°C), the microbial load remained stable and no significant difference was found in physicochemical characteristics, however, the sensory analysis indicated a decrease in quality at 49 days of storage.Item Acesso aberto (Open Access) Rheological behavior of concentrated tucupi(Universidade Federal do Pará, 2018-11) COSTA, Telma dos Santos; RODRIGUES, Antonio Manoel da Cruz; PENA, Rosinelson da SilvaTucupi, which is widely enjoyed in the North region of Brazil, is a fermented liquid derived from cassava (Manihot esculenta Crantz) and has been taken abroad for its exotic characteristics. This study aimed to assess the rheological behavior of tucupi with 30, 35, and 40% solids and concentrated at 50, 70, and 90 °C. The rheological data were obtained at 25, 40, 60, and 80 °C with increasing and decreasing shear rates. Rheology at 25 °C indicated that the partial gelification of starch during concentration causes a decrease in the product’s viscosity and, if the concentration is carried out at a temperature that favors total starch gelification, the product’s viscosity increases. Concentrated tucupi behaved as a pseudoplastic fluid, but at 60 and 80 °C with increasing shear rates, the product behaved as a dilatant fluid. Hysteresis were observed in flow curves starting at 40 °C, which characterizes concentrated tucupi as a rheopectic fluid. The Ostwald-de Waele model predicted the product’s flow curves and an Arrhenius-like equation described the dependence of temperature on apparent viscosity for the rheological data obtained with increasing shear rates. The product’s activation energy (E a) values ranged from 16.86 to 25.23 kJ/mol as a function of concentration.