1000 resultados para Análise química


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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

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Fruit processing for beverage production purposes is a way of adding value to the raw material and of raising the farmer s income by increasing the demand. Thus the objective of this work was the production of fermented West Indian cherry beverages and their physicochemical and sensory evaluation. The beverages were produced based on the Brazilian legislation for fermented fruit beverages and wine. The fermented beverages were produced from West Indian cherry pulp (pulper) and juice (press) and sweetened with sugar to obtain three types of beverage: dry, semidry and sweet. The beverages were submitted to the following physicochemical analyses: pH, alcohol, reducing sugars, total reducing sugars, total acidity, volatile acidity, fixed acidity, dry extract, reduced dry extract, alcohol to reduced dry extract ratio, free sulphur dioxide, total sulphur dioxide and turbidity. In the sensory analysis, the beverages were assessed using a 9-point hedonic scale, evaluating the attributes of appearance, odour, flavour and overall assessment. The chemical and sensory results were submitted to an analysis of variance and the means compared using Tukey s test (5%). Both the raw materials (pulp and juice) and the different sugar concentrations (dry, semidry and sweet) interfered in the sensory and physicochemical parameters of the fermented West Indian cherry beverages, the tasters showing preference for the sweetened beverages.

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The aim of this study was to produce and physicochemically characterize beer elaborated with honey. Beer production assays were carried out with nine treatments, the combination of three concentrations of the original extract (11, 13 and 15 ºBrix) with three percentages of honey in the wort formulation (0, 20 and 40%). The experiment was completely randomized with two replicates, giving a total of eighteen trials. Mashing was carried out by infusion and the honey was added during the boiling step. After clarification, the extract content was corrected with water and the wort then inoculated with bottom-fermenting yeast. Fermentation was at 10 ºC. The beer was bottled manually and stored in a freezer at a temperature of 0 ºC for 15 days, for maturation. The beers were analyzed for their alcohol content, true extract, apparent extract, colour, bitterness, turbidity, pH, total acidity, carbon dioxide, foam density and total foam. The results of the physicochemical analysis were subjected to an analysis of variance, and the means compared by Tukey's test at 5% probability. All beers were considered to be pale. The presence of honey in the formulation enhanced carbonation, foam density and total foam, but the beers were less bitter and less acid.

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Pós-graduação em Agronomia (Ciência do Solo) - FCAV

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Pós-graduação em Ciências Biológicas (Botânica) - IBB