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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

AvaliaÃÃo dos aspectos sensoriais, fÃsico-quÃmicos e minerais do suco de uva da variedade benitaka(Vitis vinÃfera L.) / Evaluation of the sensory aspects, fÃsico-quÃmicos and minerais of the juice of grape of the vatiety Benitaka (Vitis vinÃfera l.)

Ãrika Sousa Pinheiro 28 February 2008 (has links)
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico / RESUMO O mercado brasileiro de uvas de mesa à um dos mercados hortifrutÃcolas que mais crescem no paÃs. A uva à um dos frutos que apresenta considerÃvel valor nutricional, sendo rico em minerais, vitaminas e compostos fenÃlicos, à tambÃm considerado um alimento energÃtico, em razÃo da presenÃa de aÃÃcares. Hà uma tendÃncia de aumento na produÃÃo e no consumo de suco de uva devido a diversas cultivares obtidas e, tambÃm, devido à preocupaÃÃo do consumidor com a saÃde. Este trabalho teve como objetivo avaliar a estabilidade do suco de uva obtido pelo processo de extraÃÃo por meio de vapor, quanto aos aspectos quÃmicos, fÃsicoquÃmicos e sensoriais, durante um perÃodo de 210 dias de armazenamento em temperatura ambiente. Foram realizadas anÃlises de atividade Ãgua, resÃduo seco (%), pH, acidez titulÃvel, sÃlidos solÃveis, cor, fenÃlicos totais, antocianinas totais, aÃÃcares (redutores e totais), minerais (K, Na, Ca, Cu, Mg, Mn, Fe e Zn) e testes sensoriais de aceitaÃÃo do suco de uva. Os resultados para atividade Ãgua, resÃduo seco, pH, fenÃlicos totais e antocianinas totais apresentaram diferenÃa significativa com o tempo de armazenamento (p ≤ 0,05). Com relaÃÃo à anÃlise de minerais, os mesmos apresentaram-se estÃveis durante o perÃodo estudado. Para os atributos sensoriais avaliados, apenas a aceitaÃÃo da cor e da aparÃncia nÃo variaram significativamente com o tempo. O sabor, impressÃo geral, intensidade de doÃura e sabor natural de uva, alÃm da intenÃÃo de compra, apresentaram diferenÃa significativa (p > 0,05). / ABSTRACT The Brazilian market of table grapes is one of the markets fruit and vegetable that more it grew at the country. The grape is one of the fruits that presents considerable value nutritional, being rich in minerals, vitamins and phenolic compounds, it is also considered an energy food, in reason of the presence of sugars. There is an increase tendency in the production and in the consumption of due grape juice the several ones cultivate obtained and, also, due to the consumer's concern with the health. This work had as objective evaluates the stability of the grape juice obtained by the extraction process through vapor with relationships to the aspects chemical, physic-chemical and sensory, during a period of 210 days of storage at ambient temperature. We performed analyses of water activity, dry residue (%), pH, titrable acidity, soluble solids, color, total phenolics, total anthocyanins, sugars (reducers and total), minerals (K, Na, Ca, Cu, Mg, Mn, Fe and Zn) and sensory tests of acceptance of the grape juice. The results for water activity, dry residue, pH, total phenolics and total anthocyanins showed significant difference with the time of storage (p ≤ 0,05). With relationship to the analysis of minerals, the same ones came stable during the studied period. For the sensory attributes evaluated, only the acceptance of the color and appearance did not vary significantly with the time. The flavor, general impression, intensity of sweetness and natural flavor of grape, besides the purchase intention, they presented significant difference (p > 0,05).

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