Tecnologia de Alimentos
URI permanente desta comunidadehttps://locus.ufv.br/handle/123456789/11783
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18 resultados
Resultados da Pesquisa
Item Optimization of ultrasound-assisted extraction of phenolic compounds from jussara (Euterpe edulis M.) and blueberry (Vaccinium myrtillus) fruits(Food Science and Technology, 2018-01) Rocha, Juliana de Cássia Gomes; Procópio, Fernanda Ramalho; Mendonça, Adriana Corrêa; Vieira, Luciana Marques; Perrone, Ítalo Tuler; Barros, Frederico Augusto Ribeiro de; Stringheta, Paulo CesarThis study was aimed at optimizing the ultrasound-assisted extraction (UAE) of phenolic compounds from jussara and blueberry fruits using the response surface methodology (RSM). UAE was found to be more efficient to extract phenolic compounds from both fruits than the conventional extraction. The optimum extraction conditions for the jussara fruits were: extraction time between 30 and 62 min for total anthocyanins and total phenolics, fruit:solvent ratio of 10% and 6% (w/v) for total anthocyanins and total phenolics, respectively. The ethanol concentration was non-significant (p> 0.05). Acidified water was found to be an extracting solvent as efficient as ethanol in the extraction of phenolic compounds from jussara fruits. The optimum extraction conditions for blueberry anthocyanins were: ethanol concentration between 20-70% vol, and fruit: solvent ratio greater than 20% (w/v) within the range studied. The extraction time was not significant (p> 0.05). For total phenolic content: the concentration of ethanol was between 40-80%, and fruit: solvent ratio greater than 20% (w/v) and extraction time over 50 minutes. It was possible to adjust the mathematical model for the coordinates a* (verde vs vermelho) and C* (color saturation) of the jussara extracts.Item Evolution of soluble solid content and evaporation rate curves during the manufacture of dulce de leche (dl)(Food Science and Technology, 2019-01) Francisquini, Júlia D’almeida; Pereira, João Pablo Fortes; Pinto, Michele da Silva; Carvalho, Antônio Fernandes; Perrone, Ítalo Tuler; Silva, Paulo Henrique da Fonseca daDulce de leche is an evaporated dairy product that can be manufactured in different types of pots or pans. The manufacturing endpoint for dulce de leche can be determined by measuring the soluble solids content. We investigated the evaporation rates and the evaporative capacity of atmospheric pressure evaporators (pans) during the manufacture of dulce de leche. During manufacturing, four different formulations were subjected to soluble solids content determination by refractometry. In addition, the mass balance was used to determine the yield and evaporation rate. A low coefficient of variation and amplitude was found for soluble solids content, indicating standardization and uniformity during fabrication. We also observed a gradual increase in the latter throughout manufacture, without significant differences between the times. The evaporated water mass rate and its respective equation allow to reproduce the same characteristics of the experimental product in experimental and industrial production of dulce de leche.Item Microencapsulation by atomization of the mixture of phenolic extracts(Powder Technology, 2019-02) Rocha, Juliana de Cássia Gomes; Barros, Frederico Augusto Ribeiro de; Viana, Kéllen Wanessa Coutinho; Stringheta, Paulo César; Perrone, Ítalo Tuler; Tavares, Guilherme Miranda; Stephani, RodrigoBlends of jabuticaba, jussara and blueberry phenolic extracts were microencapsulated by spray drying using maltodextrin, gum arabic and whey protein concentrate (WPC) as the wall materials. Drying was performed with 10 different combinations of wall material mixtures (M1-M10). The samples, M1, M2 and M3, microencapsulated with the individual wall materials, maltodextrin, WPC and gum arabic, respectively, provided the highest encapsulation efficiency of anthocyanins. Furthermore, M1 and M2 presented the lowest hygroscopicity, while the mixtures containing WPC displayed the lowest solubility. All wall materials influenced the colour of the microcapsules, due to the different pH values of each encapsulated blend. The M2 blend was classified as a finished product and could be marketed as a high value-added protein concentrate, whereas, the other blends were considered natural colourants, with potential application in the food and cosmetics industry.Item Caracterização do Queijo do Marajó tipo manteiga produzido em duas estações do ano(Ciência Rural, 2015-04) Seixas, Vitória Nazaré Costa; Félix, Mayara Rocha; Silva, Guilherme Mendes da; Perrone, Ítalo Tuler; Carvalho, Antonio Fernandes deA Ilha de Marajó possui o maior rebanho bubalino do Brasil, sendo a Microrregião de Arari a principal produtora de leite e queijo de búfala. O objetivo do presente estudo foi caracterizar, por meio de análises físico-químicas e microbiológicas, o Queijo do Marajó tipo manteiga e verificar se há diferenças de suas características entre as estações do ano, chuvosa e seca. A acidez, pH e a porcentagem de gordura no extrato seco foram atributos de composição centesimal que apresentaram diferença significativa (P<0,05) pelo teste Tukey, entre as duas estações do ano. Os demais componentes (umidade, gordura, proteína total, cinza, EST e sal) desse queijo não variaram em função da época do ano. Quanto às características microbiológicas, as contagens foram maiores na estação chuvosa, exceto para as de Escherichia coli, que mantiveram-se constantes e adequadas à legislação. As contagens de Staphylococcus aureus foram altas e fora dos padrões da norma vigente. A contagem de aeróbios mesófilos foi maior na época das chuvas. Não foi detectada a presença dos patógenos Listeria monocytogenes e Salmonella sp. Apesar dos queijos analisados se enquadrarem nas legislações estadual e nacional, no tocante à composição química, os resultados indicam contagem S. aureus muito elevadas, o que enfatiza a necessidade da implementação imediata de Boas Práticas de Fabricação para a inocuidade dos produtos, a fim de atingir consonância com as contagens microbiológicas da legislação vigente.Item Morphological characterization of pequi extract microencapsulated through spray drying(International Journal of Food Properties, 2017) Alves, Aline Inacio; Rodrigues, Marcela Zonta; Pinto, Marcos Roberto Moacir Ribeiro; Vanzela, Ellen Silva Lago; Stringheta, Paulo César; Perrone, Ítalo Tuler; Ramos, Afonso MotaThis objective of this work was to produce spray-drying microencapsulated carotenoid extracts from pequi pulp using maltodextrin and gum arabic and to evaluate the influence of drying temperature on the physicochemical properties of microencapsulated extracts. Emulsions were spray-dried into powders at 150°C, 170°C, and 190°C. Morphological and physicochemical properties of the obtained product were investigated. The temperature of 190°C was that which best conserved the carotenoids and had the best observed solubility. The microspheres produced by spray drying presented an average size of 20 µm. Neither morphological nor color differences were observed for particles dried at different temperatureItem Production of dulce de leche: the effect of starch addition(LWT - Food Science and Technology, 2014-11-06) Silva, Fernanda Lopes da; Ferreira, Hiani Aparecida Lima; Souza, Alisson Borges de; Stephani, Rodrigo; Pirozi, Monica Ribeiro; Perrone, Ítalo Tuler; Almeida, Débora de Freitas; Carvalho, Antônio Fernandes dThis study evaluated the effect of addition of modified starch on the characteristics of dulce de leche, being conducted in two phases. In the initial phase, starches were evaluated for their ability to provide viscosity in model solutions representing the composition of dulce de leche during processing, thus evaluating the effect of solid concentration, which occurs during production, on the ability of starches to increase viscosity in simulated conditions of heat treatment and agitation promoted by Rapid Visco Analyser (RVA). It has been chosen 2 starches and 2 concentrations of soluble solids from the results of the initial phase, being employed as a criterion of choice starches with the highest viscosities at each solid concentration processing phase. In the second stage, 6 treatments were applied in triplicate, in which it's been determined the chemical composition, the instrumental color, texture profile and yield. Analyses were performed on crystallization of lactose during storage. According to the established conditions of the experiment, the starch configures itself as an important optional ingredient for the production of dulce de leche providing then longer shelf life without change in texture, composition, yield and sensory characteristic.Item Flow regime assessment in falling film evaporators using residence time distribution functions(Journal of Food Engineering, 2015-09) Silveira, Arlan Caldas Pereira; Tanguy, Gaëlle; Perrone, Ítalo Tuler; Jeantet, Romain; Ducept, Fabrice; Carvalho, Antônio Fernandes de; Schuck, PierreA falling film evaporator (FFE) is an industrial device to concentrate solutions. The aim of this study was to identify the flow regime, and characterize and model the residence time distribution (RTD) functions of a FFE. Experimental runs were carried out with skim milk at three different feed mass flow rates. Flow was characterized using experimental Reynolds number (Ref). The RTD function in the FFE was measured in four sections of the vacuum evaporator equipment. These RTD functions were modeled by a combination of perfectly mixed reactor tanks in series. In this study, when the flow regime changed from wavy-laminar to laminar, the mean residence time increased. The flow was analyzed as a main and a minor retarded flow, where two layers of product flowed through the evaporation tubes. The future of this work consists of extending the RTD approach to other products and operating conditions in the evaporator device.Item Evaluation of the viscosity profile obtained for dispersions containing different proportions of milk protein concentrate / whey protein concentrate during simulated conditions of thermal processing(LWT - Food Science and Technology, 2015-12) Perrone, Ítalo Tuler; Souza, Alisson Borges de; Costa Jr., Luiz Carlos Gonçalves; Stephani, Rodrigo; Oliveira, Marcone Augusto Leal de; Costa, Renata Golin BuenoDenaturation and interaction of different proteins occur in different forms and intensity when the pH value varies in accordance with the medium in which they are located. This study aimed to verify the influence of whey protein/casein interaction in the evolution of viscosity at different pH values, using the Rapid Viscosity Analyzer (RVA) as the thermal processing simulator. Samples of commercial whey protein concentrate (WPC) and milk protein concentrate (MPC) have been analyzed. The results of this study can be applied in the development of products obtained from dairy powders such as processed cheeses and yoghurt.Item Caracterização do queijo do Marajó tipo creme em duas estações do ano: aspectos físico-químicos e microbiológicos(Revista do Instituto de Laticínios Cândido Tostes, 2013-11-20) Seixas, Vitória Nazaré Costa; Félix, Mayara Rocha; Silva, Guilherme Mendes da; Perrone, Ítalo Tuler; Costa, Renata Golin Bueno; Carvalho, Antonio Fernandes deO queijo do Marajó é um produto artesanal derivado do leite de búfala produzido na Ilha de Marajó (PA). Os objetivos desta pesquisa foram caracterizar por meio de análises físico-químicas e microbiológicas o queijo do Marajó tipo creme e o efeito da estação do ano. O pH, a porcentagem de gordura no extrato seco (GES) e teor de cloreto de sódio foram atributos de composição centesimal que apresentaram diferença significativa ao nível de 5% de probabilidade pelo teste Tukey entre as duas estações do ano. Não foi verificada diferença estatística nos percentuais de acidez titulável, umidade, gordura, cinzas, extrato seco total (EST), proteínas e atividade de água. Quanto às características microbiológicas, houve melhoria nos resultados na estação seca com relação à coliformes e Staphylococcus aureus. Entretanto, o resultado de Escherichia coli mostrou-se melhor no período chuvoso, com todas as amostras atendendo o padrão da legislação. Na contagem de aeróbios mesófilos não houve diferença entre os períodos do ano. Não foi detectada a presença dos patógenos Listeria monocytogenes e Salmonella sp. no queijo do Marajó tipo creme nas duas estações do ano. A variabilidade ocorrida no pH, % GES e NaCl, entre as estações do ano, demonstra a necessidade de maior controle da produção visando a padronização e a manutenção da identidade do produto. Quanto aos padrões microbiológicos, esses estiveram em concordância com estabelecidos pela legislação vigente.Item Parâmetros industriais da produção de doce de leite(Revista do Instituto Laticínios Cândido Tostes, 2017-03-14) Oliveira, Ana Carolina Paiva de; Pinto, Sandra Maria; Carvalho, Antônio Fernandes de; Schuck, Pierre; Perrone, Ítalo Tuler; Abreu, Luiz RonaldoO objetivo deste estudo foi avaliar parâmetros industriais da produção de doce de leite. Durante 37 produções em escala industrial foram determinados o rendimento, o teor de sólidos solúveis e umidade do produto, o consumo de vapor e a duração da evaporação. Correlações foram estabelecidas entre as variáveis. A equação ST = 1,02 SL + 1,15, sendo ST = teor de sólidos totais, SL = teor de sólidos solúveis, descreve a relação entre ST e SL e constitui importante ferramenta para padronizar a produção e a composição do produto. A correlação mais forte estabelecida entre as variáveis ocorreu entre o tempo de produção (minutos) e o consumo de vapor (kg/h). O balanço de massa indicou uma perda média de 11,8% durante as produções. Melhorias na transferência do leite, açúcar e do produto final são indicadas como a principal solução para a redução das perdas nestas produções de doce de leite.