Navegando por Assunto "Physicochemical characterization"

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Acesso aberto (Open Access)
Estudo da estabilidade de polpas de frutas tropicais mistas congeladas utilizadas na formulação de bebidas
(Instituto de Tecnologia de Alimentos, 2017-05) CARVALHO, Ana Vânia; MATTIETTO, Rafaella de Andrade; BECKMAN, Jacqueline Chaves
The aim of this study was evaluate two formulations of mixed tropical fruit pulps stored frozen (–18 °C) for 365 days as from the mixed tropical juices obtained from them: F1 - mixed tropical juice of acerola (10%), pineapple (20%), acai (5%), cashew (5%), yellow mombin (5%), camu-camu (5%), water (43.1%) and sucrose (6.9%); and F2 - mixed tropical juice of acerola (10%), pineapple (20%), acai (10%), yellow mombin (10%), water (43.4%) and sucrose (6.6%). Physical and chemical analyses and the antioxidant capacity were determined every 45 days. The tropical juices obtained were suitable in terms of current legislation referring to acidity and soluble solids. With respect to the presence of bioactive constituents, the mixed tropical juice with the highest concentrations of acai and yellow mombin showed the highest levels of total anthocyanins and total carotenoids. After 365 days of frozen storage, the losses of carotenoid contents were 2.80% for formulation F1 and 10.07% for formulation F2. As for the total anthocyanins, the losses were higher, 44.35% and 73.48% for formulations F1 and F2, respectively. In general, it was observed that frozen storage was effective in maintaining the chemical characteristics and antioxidant activity of the mixed fruit pulps studied, resulting, after defrosting and the addition of water and sucrose, in mixed tropical juices with good nutritional and functional quality.
Acesso aberto (Open Access)
Principais compostos bioativos e capacidade antioxidante da polpa do camu-camu (Myrciaria dubia) em diferentes estádios de maturação
(Universidade Federal do Pará, 2014-06-25) OLIVEIRA, Thaise Cristine de Souza; MATTIETTO, Rafaella de Andrade; http://lattes.cnpq.br/7832266671782588; LOPES, Alessandra Santos; http://lattes.cnpq.br/8156697119235191
This study aimed to determine physical and physico-chemical characteristics, bioactive compounds and antioxidant capacity from camu-camu pulp of three different progenies, came from Active Germplasm Bank of camucamuzeiro, at Embrapa Amazônia Oriental, in three ripening stages. Over the ripening, the mass and the diameters varied (p ≤ 0.05) just for progeny 44 and the pulp yield increased for all the progenies, with results over 50% in the ripe stage. The ripening stage didn’t show effects in the moisture and ashes content and also pH for progeny 38; ashes for progeny 44 and fat and insoluble fibers for progeny 17. The others results varied with the ripening, but, with different behaviors to each progeny, except for the total sugar, soluble solids contents and the SS/TTA ratio, which showed a tendency to increase, and the total titratable acidity decreased in all the progenies. Overall, a higher level of vitamins C were obtained in the green stage, with a first step of degradation, as it reached the semi-ripe stage, followed by a synthesis step until the end of the ripening stage, except for the progeny 38, which showed a reduction. As for the phenolic compounds, during the ripening stage, the three progenies were characterized for synthesis and degradation processes of the total phenolic compounds; the total flavanols decreased; the flavonols content had a distinct behavior in each progeny, with an increasing in the progenies 17 and 38, and a decreasing in the progeny 44; due to a limitation of the method used to determine small quantities, It was possible to quantify anthocyanins only for progenies 17 and 44 in the ripening stage. The antioxidant capacity, determinated through the methods TEAC and DPPH, decreased in all the progenies. Besides the significant effects of the ripening stage, the results showed that the genetic variability of camu-camu influenced significantly the physical characteristics of the fruits and the continents of all compounds studied, and still the antioxidant capacity obtained through the methods mentioned.