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| Registros recuperados: 20 | |
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| Jorge,Tamara de Souza; Polachini,Tiago Carregari; Dias,Liara Silva; Jorge,Neuza; Telis-Romero,Javier. |
| Avocado oil is rich in bioactive compounds, which can improve human health by acting as an antioxidant. It may be extracted from different varieties of avocado, such as Margarida and Hass varieties, each of them with particular characteristics. Aiming to evaluate the differences between them, avocado fruits and pulps from these were analyzed according to their physicochemical characteristics. After extracted, the oils had their bioactive characteristics studied and rheological behavior determined through a rotational rheometer. They were then compared to commercial avocado oil. The fruits of Margarida variety had greater size, higher weight (664.51 g), and higher pulp yield (72.19%) than Hass variety, which showed higher lipid content (65.29 g/100 g dry... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Margarida; Hass; Fatty acids; Newtonian fluid; Arrhenius. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000400390 |
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| Pedro,Maria Angélica Marques; Telis-Romero,Javier; Telis,Vânia Regina Nicoletti. |
| The sorption behavior of dry products is generally affected by the drying method. The sorption isotherms are useful to determine and compare thermodynamic properties of passion fruit pulp powder processed by different drying methods. The objective of this study is to analyze the effects of different drying methods on the sorption properties of passion fruit pulp powder. Passion fruit pulp powder was dehydrated using different dryers: vacuum, spray dryer, vibro-fluidized, and freeze dryer. The moisture equilibrium data of Passion Fruit Pulp (PFP) powders with 55% of maltodextrin (MD) were determined at 20, 30, 40 and 50 ºC. The behavior of the curves was type III, according to Brunauer's classification, and the GAB model was fitted to the experimental... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water activity; Maltodextrin; Freeze drying; Spray drying; Vaccum drying; Vibrofluidized bed. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612010000400024 |
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| Telis-Romero,Javier; Sobral,Paulo José do Amaral. |
| En este trabajo fue determinada experimentalmente la porosidad de lechos de cubos de papa, remolacha y zanahoria en función de la humedad con aristas iniciales de 8mm. La porosidad del lecho, con diferentes contenidos de humedad obtenida por secado a 70ºC por diferentes tempos, fue calculada utilizando las determinaciones experimentales de volumen del lecho y volumen real de las partículas. Estos dos volumenes fueran bien representados por ecuaciónes lineares basadas en la Ley de la aditividad de los volumens. La porosidad fue representada satisfactoriamente por una ecuación parabólica. La relación volumen del lecho adimensional y humedad fue representada por polinomios de tercer grado. Utilizando un equipamiento con sistema de control, fue determinada... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vegetales; Secado; Encogimiento; Caída de presión. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612003000400021 |
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| Brandelero,Renata Paula Herrera; Vieira,Alessandra Paula; Telis,Vânia Regina Nicolleti; Telis-Romero,Javier; Yamashita,Fábio. |
| A desidratação osmótica é uma etapa essencial na elaboração de produtos de fruta através da Tecnologia dos Métodos Combinados ou de Obstáculos ("Hurdle Technology"), pois reduz a atividade de água para níveis que, combinando um ou mais obstáculos, aumentam a estabilidade do produto. Neste processo há uma perda de água da fruta para a solução e incorporação de sólidos solúveis pelo produto. Este último fluxo é considerado uma desvantagem do processo pois pode alterar o sabor do produto. Neste trabalho estudou-se a ação de revestimentos comestíveis a base de alginato e gelatina aplicados em abacaxis, previamente à desidratação osmótica, como barreira à incorporação de sólidos solúveis. Os abacaxis com e sem revestimento (controle) foram desidratados em... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Equação de Halsey; Alginato; Gelatina. |
| Ano: 2005 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612005000200018 |
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| Barbosa,Vanessa Camarinha; Garcia-Rojas,Edwin Elard; Coimbra,Jane Sélia dos Reis; Cipriano,Paula de Aguiar; Oliveira,Eduardo Basílio de; Telis-Romero,Javier. |
| Dulce de leche (DL), a dairy dessert highly appreciated in Brazil, is a concentrated product containing about 70% m/m of total solids. Thermophysical and rheological properties of two industrial Brazilian Dulce de leche formulations (classic Dulce de leche and Dulce de leche added with coconut flakes 1.5% m/m) were determined at temperatures comprised between 28.4 and 76.4 °C. In general, no significant differences (p < 0.05) were observed in the presence of coconut flakes in the two formulations. Heat capacity varied from 2633.2 to 3101.8 J/kg.°C; thermal conductivity from 0.383 to 0.452 W/m.°C; specific mass from 1350.7 to 1310.7 kg/m³; and, thermal diffusivity from (1.082 × 10-7 to 1.130 × 10-7) m²/s. The Bingham model was used to properly describe... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bingham model; Dulce de leche; Heat capacity; Thermal conductivity; Specific mass; Thermal diffusivity. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612013000100014 |
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| Souza,Silvio José Ferreira de; Alves,Aline Inácio; Vieira,Érica Nascif Rufino; Vieira,José Antônio Gomez; Ramos,Afonso Mota; Telis-Romero,Javier. |
| The equilibrium moisture content for adsorption and desorption isotherms of mango skin was determined using the static gravimetric method at temperatures of 20, 26, 33, 38 and 44 oC in the 0.056 to 0.873 water activity range. Both sorption curves show a decrease in equilibrium moisture content as the temperature increasing. The hysteresis effect was observed at constant water activity. The Guggenheim, Anderson, and de Boer (GAB) model presented the best fitting accuracy among a group of models and was used to determine the thermodynamic properties of water sorption. Integral enthalpy and integral entropy areas showed inverted values for the adsorption and desorption isotherms over the wide range of water activity studied. These values confirm, in energetic... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agricultural waste; Gravimetric method; Integral properties; Modelling; Water content. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612015000100157 |
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| Cabral,Renato Alexandre Ferreira; Orrego-Alzate,Carlos Eduardo; Gabas,Ana Lúcia; Telis-Romero,Javier. |
| Rheological and thermophysical properties were determined for blackberry juice, which was produced from blackberry fruit at 9.1 ± 0.5 °Brix and density of 1.0334 ± 0.0043 g cm-3. The concentration process was performed using a roto evaporator, under vacuum, to obtain concentrated juice at about 60 °Brix. In order to obtain different concentrations, concentrated juice was diluted with distilled water. Rheological measurements were carried out using a Rheotest 2.1 Searle type rheometer. In the tested ranges, the samples behaved as pseudoplastic fluids, and the Power-Law model was satisfactorily fitted to the experimental data. The friction factor was measured for blackberry juice in laminar flow conditions of pseudoplastic behavior. Thermal conductivity,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fruit juice; Rheology; Thermal conductivity; Thermal properties. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612007000300025 |
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| Gabas,Ana Lúcia; Telis-Romero,Javier; Menegalli,Florencia Cecilia. |
| Realizou-se a modelagem da degradação de vitamina C em ameixas desidratadas e submetidas a diferentes condições de temperatura e umidade relativa, com o auxílio da equação de Bigelow. As ameixas in natura foram liofilizadas e acondicionadas em dessecadores contendo diferentes soluções salinas saturadas na temperatura de 4ºC. Após atingir o equilíbrio, os dessecadores foram submetidos a temperaturas na faixa que variou entre 40 e 80ºC. A degradação de vitamina C foi analisada ao longo de 5 dias, aplicando-se o método de titulação com solução padronizada de 2,6-diclorofenolindofenol 0,01%. As amostras apresentaram os seguintes conteúdos de umidade: 0,05; 0,11; 0,18; 0,38 e 1,40g água/g sólido seco. A partir dos parâmetros da equação de Bigelow, tempo de... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Desidratação; Modelagem; Frutas; Vitamina C. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612003000400013 |
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| Molina-Filho,Lucídio; Pedro,Maria Angélica M.; Telis-Romero,Javier; Barboza,Silvia H. Romeiro. |
| As isotermas de sorção da carne de tambaqui desidratada osmoticamente foram determinadas a três temperaturas (5, 17 e 29ºC) e com duas concentrações de solução osmótica (10 e 30% de NaCl), pelo método gravimétrico. Quatro modelos de sorção foram testados para verificar o melhor ajuste; GAB, Oswin, BET e PELEG. Os dados experimentais se ajustaram satisfatoriamente aos modelos. O modelo escolhido para este trabalho foi o de PELEG. Para o ajuste nas curvas de sorção, foi feita a análise de regressão não-linear, usada o programa estatístico ORIGIN 4.0 para estimar as constantes dos modelos. A avaliação do melhor ajuste foi feita pela análise do coeficiente de determinação do ajuste (r²) e teste de Qui-quadrado (x²). Foram analisadas as influências da variação... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Desidratação osmótica; Atividade de água; Calor isostérico de sorção. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612006000200032 |
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| Lavoyer,Fábia Carolina Gonçalves; Gabas,Ana Lúcia; Oliveira,Wanderley Pereira; Telis-Romero,Javier. |
| Brazil is considered one of the largest producers and consumers of tropical fruits. Green coconut (Cocos nucifera L.) stands out not only for its production and consumption, but also for the high amount of waste produced by coconut water industry and in natura consumption. Therefore, there is a need for utilization of this by-product. This study aims to study the adsorption isotherms of green coconut pulp and determine its isosteric heat of sorption. The adsorption isotherms at temperatures of 30, 40, 50, 60, and 70 °C were analyzed, and they exhibit type III behavior, typical of sugar rich foods. The experimental results of equilibrium moisture content were correlated by models present in the literature. The Guggenheim, Anderson and De Boer (GAB) model... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Agro-industrial by-products; Green coconut; Thermodynamic properties; Sorption isotherms. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612013000100011 |
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| Telis,Vânia Regina Nicoletti; Lourençon,Vânia Araújo; Gabas,Ana Lúcia; Telis-Romero,Javier. |
| The objective of this work was to determine the most appropriated chemical treatment to be used to dry grapes cv. Rubi for raisin production. Drying curves for convective drying with air at 50ºC, in a tray drier, were obtained for grapes submitted to chemical pretreatments with different concentrations of potassium carbonate and olive oil, and different dipping times, according to factorial designs. Convective drying curves were also obtained for grapes pretreated in aqueous suspensions of soybean lecithin, at varied lecithin concentrations and dipping times. Page model was adjusted to the experimental drying curves, and the calculated drying times showed that the best pretreatment consisted in dipping grapes for 2 minutes in a 5% olive oil and 6% K2CO3... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vitis vinifera; Drying kinetics; Soybean lecithin; Olive oil; Dipping treatments. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2006000300018 |
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| Telis,Vânia Regina Nicoletti; Romanelli,Pedro Fernando; Gabas,Ana Lúcia; Telis-Romero,Javier. |
| The legal Pantanal caiman (Caiman crocodilus yacare) farming, in Brazil, has been stimulated and among meat preservation techniques the salting process is a relatively simple and low-cost method. The objective of this work was to study the sodium chloride diffusion kinetics in farmed caiman muscle during salting. Limited volumes of brine were employed, with salting essays carried at 3, 4 and 5 brine/muscle ratios, at 15%, 20% and 25% w/w brine concentrations, and brine temperatures of 10, 15 and 20ºC. The analytical solution of second Fick's law considering one-dimensional diffusion through an infinite slab in contact with a well-stirred solution of limited volume was used to calculate effective salt diffusion coefficients and to predict the sodium... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caiman crocodilus yacare; Mass transfer; Meat; Preservation; Processing; Brines. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000400012 |
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| Registros recuperados: 20 | |
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