Patrícia Aparecida Pimenta Pereira

Determination of the bioactive compounds, antioxidant activity and chemical composition of Brazilian blackberry, red raspberry, strawberry, blueberry and sweet cherry fruits.

This study aimed to evaluate the chemical composition, identify the bioactive compounds and measure the antioxidant activity present in blackberry, red raspberry, strawberry, sweet cherry and blueberry fruits produced in the subtropical areas of Brazil and to verify that the chemical properties of these fruit are similar when compared to the temperate production zones. Compared with berries and cherries grown in temperate climates, the centesimal composition and physical chemical characteristics found in the Brazilian berries and cherries are in agreement with data from the literature. For the mineral composition, the analyzed fruits presented lower concentrations of P, K, Ca, Mg and Zn and higher levels of Fe. The values found for the bioactive compounds generally fit the ranges reported in the literature with minor differences. The greatest difference was found in relation to ascorbic acid, as all fruits analyzed showed levels well above those found in the literature.

Evaluation of the Jelly Processing Potential of Raspberries Adapted in Brazil

UNLABELLED Generally raspberry products as jams, jellies, and preserves are made with red raspberry, however, yellow raspberry and especially black raspberry are also fruits adapted in Brazil, presenting even better productivity and quality. Thus, the aim of this study was to evaluate the processing potential of other varieties of raspberry, but the red, in the preparation of jellies through mixture design and response surface methodology (RSM). These techniques were used to optimize the following 3 variables: yellow (Golden Bliss cultivar, Rubus idaeus), black (Rubus niveus), and red raspberries (Batum cultivar, Rubus idaeus) to formulate a mixed raspberry fruit jelly through sensory evaluations. It was found that jelly formulated with a mix of colored raspberries grown in subtropical regions is a viable and alternative way to use yellow and black raspberries. The mixed raspberry jelly must have 0% to 30% yellow raspberries, 25% to 50% black raspberries, and 30% to 75% red raspberries. Within this region, the optimum formulation has ideal characteristics that are often not observed in formulations with 100% black or yellow raspberries. PRACTICAL APPLICATION The black and yellow raspberries are little explored in fresh consumption and in the development of products such as jams and jellies. From these work, using mixture design and response surface methodology, has been verified that the production of a mixed raspberry jelly seems feasible and is an interesting alternative to use the yellow and black raspberries. The results serve as a guide to the production of jams and jellies from these types of raspberries.

Analysis of the subtropical blackberry cultivar potential in jelly processing.

In Brazil, there are numerous blackberry cultivars under cultivation, however, only a few cultivars, such as the Guarani, are displayed/used for processing. In this context the aim of this work was to study the effects of different Brazilian blackberry cultivars (Guarani, Brazos, Comanche, Tupy, Cherokee, Caingangue, and Choctaw) on the physicochemical characteristics, texture profiles and the consumer acceptance of the resulting jelly to identify the potential use of these cultivars in the jelly industry. It is feasible to produce blackberry jellies with the Tupy, Comanche, Brazos, Guarani, and Choctaw cultivars because these jellies demonstrated good acceptability combined with good productivity. Consumers were shown to have a preference for a less adhesive, more acidic jelly. This study provides a useful insight about the Brazilian blackberry cultivar potential in jelly processing.

Viabilidade da utilização de queijo tipo ricota na elaboração de pão de queijo

The cheese bread is a genuinely Brazilian product, which appeared in undefined time in the farms of Minas Gerais, with the basic raw material, cassava starch or sour cassava starch. Today has been highlighted by consumption and domestic production, up to today, even to the international market. Despite its acceptance, the cheese bread does not have a standard of quality and production technology defined by the great variety of optional ingredients. Several formulations are marketed and labeled as “cheese bread”. The aim of this study was to analyze the feasibility of using ricotta cheese in the preparation of cheese. Physical analyzes density, crustal thickness, coefficient of expansion, color, texture and sensory. The percentages of cheese used in the formulations was 30% for half the cheese curing and 30%, 40% and 50% for the ricotta cheese, in relation to the percentage of cassava starch. The parameters analyzed it is concluded that increasing the percentage of ricotta cheese in the preparation of cheese bread has resulted in a softer, less gumminess, fracture, and chewiness of the crust with a thickness less, no difference in sensory cheese bread made with cheese half cure. It also follows that it is feasible to produce cheese bread with total replacement of the cheese half cure for ricotta cheese.

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.

AVALIAÇÃO DAS CARACTERÍSTICAS DE QUALIDADE DE NÉCTARES DE GOIABA LIGHT DE DIFERENTES MARCAS COMERCIALIZADAS EM LAVRAS/MG.

O presente trabalho teve como objetivo estudar as caracteristicas de qualidade de cinco marcas de nectar de goiaba “light” comercializados na cidade de Lavras/MG. As determinacoes de pH, acidez, solidos soluveis (oBrix), acucares totais e cor foram realizadas conforme metodologia proposta. Avaliou-se a aceitacao sensorial das amostras e a intencao de compra mediante equipe com 65 julgadores, utilizando escala hedonica estruturada. Os resultados das analises e do teste de aceitacao foram avaliados por analise estatistica univariada (ANOVA) e teste de medias (Tukey, p≤0,05). Com base nas informacoes dos consumidores e nos resultados do teste afetivo, foram construidos histogramas. A analise multivariada qualitativa (analise de componentes principais) tambem foi empregada com o objetivo de compreender melhor a diferenciacao das amostras analisadas. Em todos os atributos avaliados as amostras de nectar foram consideradas significativamente (p≤0,05) diferentes. Observou-se que a marca B mostrou-se estatisticamente diferente das demais marcas, apresentando maior teor de solidos soluveis, acucares e acidez e menor valor de pH. A amostra C apresentou alto valor de a*, indicando possuir cor vermelha mais intensa. Em relacao a avaliacao sensorial, observou-se que os consumidores apresentaram uma maior aceitacao pela marca B quando o sabor foi avaliado, e maior aceitacao pela amostra C quando a cor foi avaliada. A analise de componentes principais confirmou esses resultados e permitiu concluir que houve uma maior tendencia de aceitacao por um nectar de goiaba “light” de cor avermelhada e de sabor adocicado e acido , o que pode ser um parâmetro a ser seguido pelos fabricantes.

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.

Adição de soro de leite e café na qualidade do doce de leite pastoso

This research was carried out with the objective to verify the effect of substitution of milk for whey and the addition effect of coffee in the quality chemical and sensory of dulce de leche. A full factorial was used 2², with two levels (± 1) with the addition of three central points (0) and two levels of axial points (±1.41). The data were analyzed by statistical methodology of response surface and the data obtained with the acceptance testing was assessed using preference mapping. The results indicated that the increased concentration of whey increased the moisture content and yield of sweet and decreased protein and fat. The addition of coffee changed the moisture of candy. The response surface analysis for the composition of sweets showed that the maximum substitution of milk whey to produce dulce de leche would be 37%. For the preference map, observed that the sweets preferred by consumers were the formulation 1 and 2. The determining factor in their choice of sweet was the concentration of coffee, since that consumers preferred the samples with low concentrations of coffee independent of the concentration of whey, enabling with this the use of whey in the manufacture of dulce de leche, thus obtaining a new product.