Navegando por Assunto "Food Technology - Drying"

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Acesso aberto (Open Access)
Obtenção de um produto desidratado à base de tucupi, jambu e banana verde através do processo de Refractance Window
(Universidade Federal do Pará, 2014-11-10) SANTOS, Paula Hellayne Costa dos; SILVA, Luiza Helena Meller da; http://lattes.cnpq.br/2311121099883170
Given the immense diversity of fruits, vegetables and products developed in northern Brazil, tucupi, jambu and banana are notable because they are widely used, not only in culinary of Pará, but for several other purposes. Aiming to use these abundant products in the northern Brazil, the present work aimed at obtaining a dehydrated product based on tucupi, jambu and green banana, through the Refractance Window process. The formulations were dried at a temperature of 70 ° C, in a time of 50 min. Two formulations coded as FORM I and FORM II were dried. The initial moisture content of the formulations was 88% wb, and the values of final moisture content of the dehydrated product were 10% (for FORM I) and 9% (for FORM II). The drying time of the samples varied from one formulation to another, and the time was shorter for the drying of FORM II. The dried products had high water absorption capacity (2159.091 for FORM II) and (1666.667 for FORM I) and had an average oil absorption capacity. As to hygroscopicity, the products were considered little hygroscopic: 7.9 and 9.27 g H2O / g of sample for FORM I and FORM II, respectively. The dehydrated products showed significant content of phenols: 221.18 and 169.49 mg GAE / 100 g of sample for FORM I and FORM II, respectively. Regarding antioxidant capacity, the dehydrated products had higher antioxidant capacity by DPPH radical sequestration than the ABTS radical. For the results of color, the values (ΔE *) varied significantly for the dehydrated products with the same drying conditions. The shelf life was evaluated for 35 days and it was observed that the dried product of the Form I showed no change from seventh day, when evaluated by moisture gain, whereas FORM II showed variation during the entire period of storage . When the assessed parameter was the water activity, the FORM II did not change from the 14th day, while the FORM I changed only in twenty-first day of storage.
Acesso aberto (Open Access)
Obtenção de um produto em pó a partir de banana verde, açaí e concentrado proteico do soro do leite utilizando secagem em leito de jorro
(Universidade Federal do Pará, 2014-07-02) SILVA, Aline Kazumi Nakata da; RODRIGUES, Antonio Manoel da Cruz; http://lattes.cnpq.br/7524720020580309
The açaí berry is a fruit that has attracted interest for its high content of bioactive compounds. Drying is an alternative to prolong the life of açaí pulp, facilitating their transport, storage and handling of the product. The purpose of this study was to obtain a powder mix of green banana, açaí and whey protein concentrate (WPC), with high functionality and wide application in the food industry. The mix was obtained from the mixture of green banana pulp açaí pulp in the ratio (2:1) followed by addition of 10% WPC. The mixture was homogenized and subjected to drying in spouted bed at temperatures of 70, 80 and 90 °C. The products presented moisture within the limits recommended by Brazilian legislation as are inserted in microbiologically stable range of water activity. The mix had a protein content around 20%, low bulk density, low hygroscopicity and low solubility. Regarding color, the mix showed a strong tendency to red and higher values of total color change (ΔE*) for drying at 80 and 90 °C. The mix can be considered as a good source of phenolic compounds. The antioxidant capacity observed in the mix proved to be mostly from the anthocyanins. The mix showed characteristic crystallinity of starch granules. The analysis showed a heterogeneous morphology microstructure to mix 70 °C with starch granules readily distinguishable with respect to mix 80 and 90 °C, and concluded that the drying air temperature affect the product structure differently. In thermal analysis thermograms showed characteristic curves for starch products, high stability of the mix being observed as the reactions of thermal decomposition began around 300 °C.