Luisa Pereira Figueiredo

Estudo de variáveis de processamento para produção de doce em massa da casca do maracujá (Passiflora edulis f. flavicarpa)

The use of passion fruit peel as raw material for the preparation of preserves represents a good economic alternative for the use of this residue. The objective of this work was to select the best maceration method for the peel and determine the influence of the variables of juice concentration and soluble solids on the physicochemical, physical, and sensory characteristics of the different formulations. The results indicated that the best formulation was the one obtained using skinless albedo macerated for 24 hours with the addition of 150 mL of passion fruit juice and concentrated to 68oBrix , which presented the yellower color and firmer texture.

Quality evaluation of banana skin extract jellies

Due to the great volume of banana skin resulting from the industrialization of banana and to their high pectin content, the objectives of the present study were to evaluate the effect of the following factors: extract/sugar, pectin and citric acid on the chemical, physical and sensory qualities of the jellies obtained. A complete factorial experimental design was used (23) with 3 central points to evaluate the influence of the factors on the dependent variables, testing the linear models. The chemical properties underwent few alterations and the instrumental and sensory texture attributes were mainly affected by the extract/sugar ratio and the pectin level. The brittleness, elasticity and gumminess increased with increases in the extract/ sugar ratio and pectin level. According to the sensory analysis and the purchasing intention, the best formulations were those obtained using a higher extract/sugar ratio (60/40) and lower pectin level (0.5 g/ 100), combined with the highest (20 mL) or lowest volumes of citric acid (15 mL), with scores for all the attributes in the range from ‘I liked slightly’ to ‘I liked moderately’.

Efeito da adição de suco de maracujá e tempo de cozimento sobre a qualidade de doces do albedo de maracujá em calda

Brazil produces tons of yellow passion fruit skin and seed residues that could be used for human consumption. The objective of this work was to determine the effects of the process parameters (volume of passion fruit juice used and cooking time of the albedos), on the physicochemical properties (pH, soluble solids, titratable acidity and total sugars) of compote prepared with passion fruit skin, and the sensory acceptance by consumers aiming to use the residues produced by food industries. A complete 22 factorial design was used to evaluate the parameters and responses. The sensory acceptance of the preserves was evaluated using a 9-point hedonic scale and buying intention using a 5-point scale. Lower pH values were obtained using larger volumes of juice and longer cooking times, both for the albedo and the preserves. For the albedo, higher values for soluble solids were found with longer cooking times and smaller volumes of juice. The overall results indicated a cooking time longer than 10 minutes and a larger volume of passion fruit juice as the most adequate processing conditions.

Influence of process parameters on the color and texture of passion fruit albedo preserved in syrup

The industrialization of passion fruit in the form of juice produces considerable amounts of residue that could be used as food. The objective of the present study was to determine the effects of the volume of passion fruit juice added to the syrup and the cooking time on the color and texture of passion fruit albedo preserved in syrup. Multi-linear models were well fit to describe the value for a* (for the albedo) the values for b* (for the albedo and syrup), which exhibited high correlation coefficients of 98%, 84%, and 88%, respectively. The volume of passion fruit juice added and the cooking time of the albedos in the syrup, involved in the processing of passion fruit albedo preserves in syrup, significantly affected color analyses. The texture was not affected by the parameters studied. Therefore, the use of larger volumes of passion fruit juice and longer cooking time is recommended for the production of passion fruit albedo preserves in syrup to achieve the characteristic yellow color of the fruit.