Navegando por Autor "BARROS, Hellen Carvalho"

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Acesso aberto (Open Access)
Processo de secagem de Morinda citrifolia L. em secador de radiação com lâmpadas refletoras, utilizando planejamento composto central rotacional
(Universidade Federal do Pará, 2015-10-16) BARROS, Hellen Carvalho; BRASIL, Davi do Socorro Barros; http://lattes.cnpq.br/0931007460545219; FARIA, Lênio José Guerreiro de; http://lattes.cnpq.br/7428609361678173
Morinda citrifolia Linn, popularly known as Noni, is a plant in the Rubiaceae, family that has been used for many centuries in popular medicine. The ancestors of the Polynesians discovered the plant and there have been numerous reports of its therapeutic and nutritional properties. For that reason, it was decided to carry out a study with the fruits of the species Morinda citrifolia L., in order to encourage use of the fruit for consumption in people’s diet, as well as to confirm its functional potential after drying. In this research, the conditions for drying Noni fruits were studied, and the phenolic compounds and antioxidant activity of the extracts obtained were assessed and quantified. In the drying process a dryer with reflecting lamps was used at the laboratory scale. In analyzing the process a statistical model was used as a basis, to quantify the effects of the entry variables in the Responses, by means of regression analyses through rotational central compound planning (PCCR) with two entry variables and five levels, employing temperature and size of the pulp as entry variables and final humidity level, antioxidant capacity and free radical sequestration activity as responses. It was observed that increasing the drying temperature led to a decrease in the final humidity level of Morinda citrifolia L fruits.The values of the responses observed varied from 0,01 a 3,50 bs, for drying; 1,32% a 38,8%, and 12,54 to 26,56(mg Eag/g) for phenolic levels.Within the experimental domain, only the variable of the isolated entry X1 (temperature) in the linear and quadratic forms were statistically influential on the Xbsresponse variable.
Acesso aberto (Open Access)
Secagem de açaí branco por liofilização e em leito de jorro: influência da concentração e de diferentes agentes carreadores nas características físicas, químicas, bioativas e colorimétricas do pó obtido
(Universidade Federal do Pará, 2024-04-05) BARROS, Hellen Carvalho; COSTA, Cristiane Maria Leal; http://lattes.cnpq.br/0581730621014796; FARIA, Lênio José Guerreiro de; http://lattes.cnpq.br/7428609361678173; https://orcid.org/0000-0002-9534-9998
The objective of this study was to analyze how the use of four different carrier agents (modified starch, gum arabic, maltodextrin and hydrolyzed collagen) and different concentrations (10, 20 and 30%) influence the white açaí powder produced by lyophilization and in a bed of gush. Yield, moisture, total polyphenols, antioxidant activity, hygroscopicity, solubility, fluidity, color, chemical structure, and morphology were the responses evaluated. In freeze-drying, the yield of the process (≥ 75.40%) and the moisture content of white açaí powder (≤ 4.93 g 100 g- 1) did not differ statistically (p ≤ 0.05), regardless of the agent carrier used. In spouted bed drying, the addition of modified starch or hydrolyzed collagen promoted higher process yield (≥ 42.70%). However, the white açaí produced with hydrolyzed collagen was the only one that had a moisture content ≥ 6.00 g 100 g-1. In both drying processes, powders produced with modified starch were less soluble (≤ 48.96%), despite low hygroscopicity (≤ 13.73 g 100 g-1). Samples produced with maltodextrin or gum arabic showed higher levels of total polyphenols (≥ 8.52 mg EAG g-1) and antioxidant activity (≥ 42.75 μmol ET g-1). In addition, they were more soluble (≥ 94.36%), fluid (11 to 15% according to the carr index), and better preserved the original color of the pulp to the detriment of other formulations. The chemical structure of white açaí powders obtained with different carrier agents was like that of the pulp, indicating efficient encapsulation of bioactive compounds and good preservation of functional groups present in the original raw material, even after drying processes.