desidratação da polpa de tamarindo pelo método de camada de espuma dehydration of tamarind pulp through the foam-mat drying method

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ID: 169153
2008
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Abstract
Objetivou-se, no presente trabalho, estudar a cinética de secagem da polpa de tamarindo pelo método de camada de espuma (foam-mat), a 50, 60, 70 e 80 ºC, e avaliar o efeito dessas temperaturas no teor de ácido ascórbico, acidez total titulável e na cor, expressa pelo parâmetro luminosidade (L*) matiz (hº). Para a representação dos dados experimentais da secagem, três modelos matemáticos de camada fina foram aplicados adotando-se como critérios de seleção o coeficiente de determinação (R²) e o desvio quadrático médio (DQM). De acordo com os resultados obtidos, tem-se que a temperatura é um fator determinante no processo de desidratação e que o modelo de Midilli e Kucuk foi o que melhor representa o comportamento das curvas de desidratação. Os melhores resultados para o teor de ácido ascórbico, acidez titulável e cor foram obtidos para as temperaturas de 60 e 70 ºC.
The foam-mat drying process was studied for the tamarind pulp at 50, 60, 70 and 80ºC and the temperature effect on the tamarind powder were evaluated as regards to ascorbic acid content, total titratable acidity and colour, expressed by luminosity (L*) and hue (hº). For the representation of the drying process three models for thin-layer were applied and the criterion of evaluation used were the coefficient of determination (R²) and root mean square error (DQM). According to the results the temperature is a determinant parameter in the drying process, and the Midilli and Kucuk model was the best one to represent the behavior of the drying curves. The best results for ascorbic acid content, titritable acidity and colour were obtained at the temperatures of 60 and 70 ºC.
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Authors ;Adriano Sant'ana Silva;Kátia Cristina de Oliveira Gurjão;Francisco de Assis Cardoso Almeida;Riselane de Lucena Alcântara Bruno;Walter Esfrain Pereira
Journal information and software technology
Year 2008
DOI
10.1590/S1413-70542008000600032
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542008000600032
Keywords
modelling conservation drying

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