Prediction of pH Change in Processed Acidified Turnips

The acetic acid uptake by turnips was studied during an acidification process in containers. The process was successfully described by a Fickian diffusion, using a correlation for the buffer effect. Diffusion coefficients (0.629 to 3.99 × 10-9 m2/sec) and partition coefficients (0.8 to 1.1) were obtained by optimization of the fit between experimental and theoretical values, using the simplex method. The partition coefficient did not show an evident dependence on temperature, while diffusivity followed an Arrhenius type behavior. The relationship between acid concentration and pH was described using a cubic model with parameters independent of temperature. Results showed that the combination of these models describing the acid diffusion into the food and the buffering effects of the food allowed accurate prediction of pH evolution in the acidification process

Evaluation of new red winemaking technologies through consumer liking

Existem diversos estudos que propõem mudanças na tecnologia de vinificação para melhorar a qualidade do vinho tinto, refletindo na sua maior aceitabilidade. Nesse contexto, o objetivo do presente artigo foi avaliar a influência da pré-secagem e da remontagem constante na aceitabilidade dos vinhos tintos das cultivares Bordô (Ives) e Isabel quanto aos atributos aparência, aroma, corpo, sabor e à impressão global (aceitação global). Oitenta consumidores avaliaram as amostras utilizando uma escala hedônica estruturada de 9 pontos e uma escala de intenção de compra de 5 pontos. Os dados hedônicos foram analisados por meio da Análise de Cluster e Escalonamento Multidimensional. Diferenças significativas (P0.700), mostrando que o sabor exerce grande influência na avaliação global das amostras de vinho, independentemente dos outros atributos. A relevante aceitação global dos vinhos dos tratamentos inovadores sugere o grande potencial desses processos de vinificação.Several studies proposed changes in winemaking technology in order to improve wine quality, reflecting on its high acceptance. Thus, the aim of this work was to evaluate the influence of pre-drying and constant pumping effect technologies on sensory attributes of Bordô (Ives) and Isabel red wines through the acceptance evaluation of appearance, aroma, body, flavor and overall acceptance. Eighty consumers evaluated the samples using a 9-point structured scale and sensory data were analyzed by Cluster Analysis followed by Multidimensional Scaling. Significant differences (P0.700) and the consumer panel showed that the overall acceptance of the wines was influenced by the flavor, regardless of the other attributes. The higher acceptance of the pre-drying and static pomace wines suggests the potential of these winemaking processes.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Universidade Estadual Paulista Júlio de Mesquita FilhoUniversidade Estadual Paulista Júlio de Mesquita Filho UNESP, Departamento de Engenharia e Tecnologia de Alimentos - São José do Rio Preto - SP - BrasilUniversidade Estadual Paulista Júlio de Mesquita FilhoUniversidade Estadual Paulista Júlio de Mesquita Filho UNESP, Departamento de Engenharia e Tecnologia de Alimentos - São José do Rio Preto - SP - Brasi