Caracterização fisico-química e capacidade antioxidante de pitangas (Eugenia uniflora L.)

This study was carried out to obtain more information about the physicochemical properties, composition, and antioxidant activity of pitanga fruits (Eugenia uniflora L.), particularly fruits from the State of Rio Grande do Sul, Brazil. Pitanga with different flesh colors (purple, red, and orange) from tree selections cultivated at Embrapa Clima Temperado (RS-Brazil) were analyzed. Only slight differences were observed in the quality parameters and in the proximate and fatty acid compositions among the fruits studied. The extracts from purple-fleshed pitanga had the highest total phenolic and anthocyanin contents along with the highest antioxidant capacity. The antioxidant capacity (DPPH and FRAP assays) of methanolic pitanga extracts was highly correlated with the total phenolic content, but in ethanolic extracts, the anthocyanin content was correlated only with the FRAP antioxidant capacity. Orange fleshed pitanga had higher β-cryptoxanthin and β-carotene levels than those of the red fruit, which had higher lycopene content. The results indicate that the purple-fleshed pitanga, cultivated in Rio Grande do Sul, is a rich source of phenolic compounds and has high antioxidant capacity. The red and orange-fleshed pitanga, on the other hand, are rich sources of carotenoids.Este estudo foi realizado para obter mais informações sobre as propriedades físico-químicas, composição e atividade antioxidante de frutos de pitanga (Eugenia uniflora L.), especialmente os do Rio Grande do Sul (Brasil). Foram comparadas pitangas com diferentes colorações de polpa (roxa, vermelha e laranja) de seleções cultivadas na Embrapa Clima Temperado (RS-Brasil). Foram observadas pequenas diferenças nos parâmetros de qualidade e na composição centesimal e de ácidos graxos entre as frutas com diferentes colorações de polpa. Os extratos de pitanga roxa apresentaram maiores conteúdos totais de fenólicos e de antocianinas, bem como, a maior capacidade antioxidante. A capacidade antioxidante (valores de DPPH e FRAP) dos extratos metanólicos de pitanga apresentou alta correlação com o conteúdo de fenólicos totais, mas nos extratos etanólicos, o conteúdo de antocianinas correlacionou-se apenas com a capacidade antioxidante avaliada pelo método de FRAP. A pitanga de cor laranja apresentou maiores teores de β-criptoxantina e β-caroteno, enquanto que a de cor vermelha continha alto teor de licopeno. Os resultados indicam que a pitanga de cor roxa, cultivada no Rio Grande do Sul, é uma fonte rica de compostos fenólicos e possui alta capacidade antioxidante. As de cor vermelha e laranja, por outro lado, são fontes ricas de carotenoides.147154Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES

Diferentes formulações de multimisturas sobre a resposta biológica em ratos Biological response of rats fed with different multimistura formulations

Este estudo foi conduzido com o objetivo de avaliar a efetividade da complementação com diferentes formulações de multimistura em uma dieta padrão, consumida pelas populações assistidas pela Pastoral da Criança da Diocese de Santa Maria, Rio Grande do Sul. Foram usados 35 ratos machos Wistar divididos em cinco grupos de sete animais, cada qual alimentado com dieta padrão complementada com formulações distintas de multimistura (5% do total da dieta). Observou-se que a multimistura que aliou nutrientes de leguminosas e gramíneas proporcionou maior ganho de peso, consumo e coeficiente de eficiência alimentar que as demais complementações. As multimisturas com maior proporção de farelos ou com nutrientes energéticos mostraram-se limitadas quanto ao seu uso como complementos/suplementos alimentares. Não foram observadas diferenças significativas nos parâmetros de matéria seca nas fezes, digestibilidade aparente da proteína, gordura epididimal e glicemia e no peso do fígado entre os grupos estudados.The purpose of this study was to evaluate the effect of different multimisturas formulations in based diet, consumed by people assisted by "Pastoral da Criança da Diocese de Santa Maria", in the state of Rio Grande do Sul, Brazil. Thirty five male Wistar rats were divided into five groups of seven animals, each one fed with based diet complemented with different multimistura formulations (5% of the diet). The major gain weight, feed intake and feed efficiency coefficient were observed in the formulation complemented with leguminous and cereals ingredients. The treatment with major proportion of meal or energetic nutrients did not show effective results. No significant differences were observed in the feces dry matter, apparent protein digestibility, liver weight, epididimal fat and glicemic index between the groups studied

Physicochemical characterization and antioxidant capacity of pitanga fruits (Eugenia uniflora L.)

This study was carried out to obtain more information about the physicochemical properties, composition, and antioxidant activity of pitanga fruits (Eugenia uniflora L.), particularly fruits from the State of Rio Grande do Sul, Brazil. Pitanga with different flesh colors (purple, red, and orange) from tree selections cultivated at Embrapa Clima Temperado (RS-Brazil) were analyzed. Only slight differences were observed in the quality parameters and in the proximate and fatty acid compositions among the fruits studied. The extracts from purple-fleshed pitanga had the highest total phenolic and anthocyanin contents along with the highest antioxidant capacity. The antioxidant capacity (DPPH and FRAP assays) of methanolic pitanga extracts was highly correlated with the total phenolic content, but in ethanolic extracts, the anthocyanin content was correlated only with the FRAP antioxidant capacity. Orange fleshed pitanga had higher β-cryptoxanthin and β-carotene levels than those of the red fruit, which had higher lycopene content. The results indicate that the purple-fleshed pitanga, cultivated in Rio Grande do Sul, is a rich source of phenolic compounds and has high antioxidant capacity. The red and orange-fleshed pitanga, on the other hand, are rich sources of carotenoids