Richard Marins da Silva

The objective of this study was to develop and characterize cassava-starch-based films incorporated with buriti (Mauritia flexuosa L.) oil and emulsifier (Tween 20). An experimental factorial design 2² with three central points was used to develop the films, by varying the concentrations of buriti oil (0.15 to 0.45% w/v) and emulsifier (0.02 to 0.04% w/v). Film thickness and weight increased with increasing buriti oil concentration. The water vapor permeability of the films ranged from 0.22 to 0.366 g mm h⁻¹ m⁻² kPa⁻¹. The tensile strength values varied from 4.21 to 6.95 MPa, the elasticity modulus varied from 538.53 to 722.78 MPa, and elongation to rupture varied from 1.13 to 1.66%. The film color was characterized as yellowish, dark, and intense (higher oil content); and clear and a low-intensity color (lower oil content). The films presented a total carotenoid content ranging from 3.63 to 29.73 μg β-carotene/g, which may have resulted in their antioxidant potential against DPPH• (1,1-diphenyl-2-picryl-hydrazyl) radical (from 74.28 to 87.74%). The central formulation of the experimental design (buriti oil 0.30% and emulsifier 0.03%) presented a good performance and can be applied as packaging for foods with a lower water content and that demand protection against oxidation.

This study focused on the extraction, purification, and physicochemical characterization of γ‐conglutin, a protein present in lupin seeds with properties of reducing blood glucose levels. Total protein was extracted with an alkaline‐saline solvent, followed by isoelectric precipitation. Chromatographic purification of the precipitated fraction was performed using a cation exchange supermacroporous cryogel column. Electrophoresis of the eluted fraction from chromatography presented a single band of ∼48 kDa under non‐reducing conditions (two bands of ∼30 and ∼17 kDa, under reducing conditions) confirming the success of the purification protocol. Liquid chromatography‐tandem mass spectrometry analysis confirmed the identity of the protein as γ‐conglutin. The purified γ‐conglutin had an isoelectric point of 7.51, β‐sheets prevailing as a secondary structure, and denaturation temperature close to 68°C. The outcome of this work showed that γ‐conglutin was obtained with a high degree of purity. The proposed purification protocol is simple and can be easily scaled up.

Ice creams are basically composed of: milk protein, sugar, fat, water, emulsifiers, stabilizers, dyes, flavorings and additional ingredients such as chocolate, cookies, wafers, pieces of fruit and nuts, among others. The characteristics of food products change over the shelf-life and can become undesirable. The physical characteristics of the ice cream are influenced according to the composition, and the chosen manufacturing process will directly interfere with the aggregation state of the fat globules, the amount of incorporated air, the size of the air bubbles, the viscosity of the aqueous phase and the size and aggregation status of the ice crystals. Among these quality interferents are also handling and storage conditions. In this study an analysis was carried out about the stability of soft serve ice cream produced from UHT milk drink through the sedimentation and melting index in a period of 0, 60 and 120 days, showing good consumption conditions for all analyzed samples.

Bebidas lácteas UHT como a do presente estudo pode ter como aplicação tecnológica o sorvete soft serve ou expresso como também é conhecido. Neste estudo foi realizada a caracterização físico-química e microbiológica da bebida láctea UHT utilizada como mistura líquida para sorvete ao longo do shelf-life, em três temperaturas de estocagem (21, 28 e 35 °C), além disso foram avaliados três lotes do mesmo produto, com a mesma formulação, produzidos em sequência para verificar a repetibilidade do processo produtivo, foi percebido estabilidade dos produtos, apesar de ter ocorrido uma pequena queda de pH, aumento de acidez e escurecimento por reação de Maillard nos produtos armazenados em temperatura mais alta. Foi realizado estudo reológico e verificado comportamento pseudoplástico para as bebidas lácteas utilizadas como insumo para sorvete soft serve, após a extrusão foi medida a estabilidade do mesmo através de índice de sedimentação e derretimento apresentando boas condições de consumo para todas as amostras analisadas.

The cajá fruit stands out for its peculiar flavor, but little is known about its physical, physical-chemical and nutritional characteristics. The knowledge of fruit and seed biometrics, physicochemical and nutritional composition provides information for the conservation and exploitation of resources of economic value, and can be exploited by genetic improvement programs to obtain cultivars that provide fruits with important characteristics for commercialization. Thus, it aimed to evaluate the characteristics we sought to evaluate these characteristics considering samples from different trees / regions of the municipality of Montes Claros of Goiás. The cajá fruit biometry (density, volume, mass, fruit and seed size and pulp yield) was measured. Titratable acidity, soluble solids content, pH, vitamin C content and mineral content were also measured. Total phenolic compounds and antioxidant activity were evaluated by the Folin-Ciocalteau, ORAC and ABTS methods, respectively. With the results obtained, it was possible to infer that the fruits harvested in different trees of different places differed statistically. The fruits of Region 2 had the highest fruit and seed length and diameter, as well as the highest pulp thickness, macro and micronutrient content and total phenolic compounds content, compared to fruit from other areas probably influenced by type of soil. The knowledge of the characteristics of the fruits from different trees / regions is necessary because the industrialization needs parameters for standardization in the formulation of different foods.

Due to the good acceptability and being an easily accessible and economically product for consumption, the production of chicken meat has been increasing in the last two decades.That said,it was aimed with this research to evaluate the microbiological, physicochemical quality of fresh and seasoned chicken meat commercialized in the city of Santa Helena de Goiás.The samples were collected in four commercial establishments and then there were carried out microbiological analyzes for total, thermotolerant coliforms and Salmonella spp, physical and chemical analyzes for pH, acidity and water retention.The results obtained in the microbiological analyzes for total and thermotolerant coliforms showed that the samples were above the limits established by Normative Instruction No. 62, of 09/18/2003, by the Brazilian Ministry of Agriculture, Livestock and Supply.For Salmonella spp. evaluation the microorganism was present in 25g in three from the four samples evaluated.The pH of the samples ranged from 6.17 to 6.53, consistent with values found in the literature.A there was a small variation in the analyzed samples acidity.Only one sample, among the four evaluated showed higher water retention.Thus, it was possible to conclude that the fresh and seasoned chicken cuts analyzed were not in hygienic-sanitary conditions suitable for consumption.

The objective of this work was to perform foam-mat drying of yellow mombin pulp, verifying the kinetics and mathematical modeling of the process, and characterizing the obtained product with respect to physical and chemical characteristics, compared with the fresh pulp. Foam-mat drying was carried out with the aid of the foam agent Emustab^®, at temperatures of 50, 60, 70 and 80 °C. The drying data were analyzed and fitted to four mathematical models (Wang & Singh, Verma, Page and Midilli). Effective diffusion coefficient and activation energy were determined. Titratable acidity, pH, soluble solids content and vitamin C content, as well as the solubility in water of yellow mombin powder and color variance (L*, a*, b*) were analyzed in both fresh and dehydrated pulp. The Wang & Singh model showed best fit at the temperature of 50 °C, whereas the Midilli model showed the best mathematical fit at temperatures of 60, 70 and 80 °C. Net diffusion coefficient and activation energy values were proportional to the drying temperature. Drying of the foam at 60 °C indicated guarantee of quality of yellow mombin pulp with respect to titratable acidity, pH and color of the a* coordinate.