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| Registros recuperados: 19 | |
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| Resende,Osvaldo; Oliveira,Daniel E. C. de; Costa,Lílian M.; Ferreira Júnior,Weder N.. |
| ABSTRACT This study aimed to fit different mathematical models to the experimental data on drying of baru fruits (Dipteryx alata Vogel), determine and assess the effective diffusion coefficient, as well as obtain the activation energy and thermodynamic properties for the drying process under different air temperature conditions. Baru fruits with an initial moisture content of 0.429 ± 0.044 (dry basis, db) were dried in a forced air ventilation oven under four temperature conditions (40, 60, 80, and 100 °C) until reaching a moisture content of 0.065 ± 0.018 (decimal db). These data were fitted to mathematical models frequently used to represent the drying of vegetal products. The Logarithmic model presented the best fit to describe the phenomenon. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mathematical modeling; Liquid diffusivity; Logarithmic. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000100103 |
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| Silva,Lígia C. de M.; Resende,Osvaldo; Oliveira,Daniel E. C. de; Ferreira Junior,Weder N.; Rodrigues,Gabrielly B.. |
| ABSTRACT Drying is the most widely used process to ensure the quality and stability of plant products. Therefore, this study aimed to determine the effective water diffusivity and activation energy in grain sorghum during drying at different temperatures and initial moisture contents. Sorghum grains (cultivar DeKalb 640) were harvested with an initial moisture content of 0.49 kg water kg−1 dry matter. The effective diffusion coefficient was determined from different initial moisture contents of approximately 0.49, 0.40, 0.31, and 0.23 kg water kg−1 dry matter. Grains with different moisture contents were dried under four temperature conditions of 40, 60, 80, and 100 °C on perforated trays. The spherical geometry model was used for liquid diffusion. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Diffusion coefficient; Activation energy; Sorghum bicolor L.. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162019000600737 |
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| Silva,Daiana V.; Oliveira,Daniel E. C. de; Resende,Osvaldo; Silva,Marco A. P. da; Barcelos,Keyla R.. |
| ABSTRACT Baru (Dipteryx alata Vogel) is a native tree of the Cerrado. The drying and milling process can be an alternative for the use and conservation of baru fruits. The objective of this study was to evaluate the effect of drying on the nutritional characteristics of the epicarp + mesocarp flour of baru fruits. The fruits were collected in the municipality of Santa Helena de Goiás, Goiás, sanitized and submitted to drying in an oven with air circulation at temperatures of 40, 60, 80 and 100 ºC until they had a constant mass. The analyses were performed in triplicate and the results evaluated by analysis of variance and Tukey test (p ≤ 0.05). Flours produced from dehydrated fruits had a reduction in lipid content (treatments 100 °C), energy value (60 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dipteryx alata Vogel; Antioxidant activity; Phenolics; Carotenoids. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000100065 |
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| Smaniotto,Thaís A. de S.; Resende,Osvaldo; Marçal,Kaique A. F.; Oliveira,Daniel E. C. de; Simon,Gustavo A.. |
| Propôs-se, neste trabalho, avaliar a qualidade fisiológica das sementes de soja ao longo do armazenamento durante 180 dias em diferentes teores de água e em duas condições de temperatura. Foram utilizadas sementes de soja, cultivar CD 242 RR com teores de água iniciais de 12, 13 e 14% (b.u.). As sementes foram adquiridas com o teor de água de 11,0% (b.u.); em seguida, foram umedecidas em câmara BOD a 20 ºC e 85% de umidade relativa, homogeneizadas e acondicionadas em sacos plásticos de polipropileno; as embalagens foram mantidas em dois ambientes distintos. Com vista à avaliação das sementes ao longo do armazenamento foram realizadas as análises de teor de água, germinação, primeira contagem da germinação, índice de velocidade de germinação e condutividade... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Teor de água; Temperatura; Glycine max (L.). |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662014000400013 |
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| Quirino,José R.; Resende,Osvaldo; Fonseca,Natalia N.; Oliveira,Daniel E. C. de; Parizzi,Fatima C.; Souza,Tiago A. de. |
| ABSTRACT Grain quality determination involves important stages such as collection of the representative sample, homogenization, and dilution. The interrelation among sampling, homogenization, and working sample size is essential to the reliability of the information generated. Therefore, this work aimed to analyse the performance of mechanical homogenizers used in the commercialization of grains in Brazil, as a function of the size of the working sample masses during grain classification. The samples were homogenized and diluted in Boerner, 16:1 multichannel splitter, and 4:1 multichannel splitter until reaching masses of 0.025, 0.050, 0.075, 0.100 and 0.125 kg to determine the level of damaged grains. A 3 x 4 x 5 factorial design was used, meaning three... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dilution; Sampling process; Standardization. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000500378 |
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| Ullmann,Renan; Resende,Osvaldo; Chaves,Tarcísio H.; Oliveira,Daniel E. C. de; Costa,Lílian M.. |
| Objetivou-se, com este trabalho, analisar a qualidade fisiológica das sementes de sorgo sacarino submetidas à secagem em diferentes condições de ar. A secagem do sorgo sacarino foi realizada mantendo-se as temperaturas controladas de 40, 55, 70, 85 e 100 °C e umidades relativas de 28,4; 18,6; 12,2; 7,3 e 3,1%, durante os períodos de 3,0; 1,75; 1,42; 1,08 e 0,83 h, respectivamente. Depois da secagem as sementes foram submetidas às análises de condutividade elétrica, porcentagem de germinação, primeira contagem da germinação, índice de velocidade de germinação (IVG), porcentagem de emergência, primeira contagem da emergência e índice de velocidade de emergência (IVE). Constata-se que o aumento da temperatura do ar de secagem promove maior danificação nas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Danificação; Germinação; Vigor. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662015000100064 |
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| Silva,Hellismar W. da; Oliveira,Daniel E. C. de; Resende,Osvaldo; Costa,Lílian M.. |
| ABSTRACT Thermodynamic properties provide information on energy demand and kinetic parameters in water sorption processes in agricultural products. Such information is essential to analyze and scale drying and storage equipment. The objective of this study was to determine the thermodynamic properties involved in the water desorption process in Buchenavia capitata (Vahl) Eichler seeds with moisture contents ranging from 13.31 to 7.21% dry basis (d.b.), obtained by the indirect static method, at temperatures of 10, 20, 30 and 40 °C. The latent heat of vaporization, differential entropy and Gibbs free energy increase with the reduction of the moisture content of the seeds. The enthalpy-entropy compensation theory is valid for the desorption process, which is... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Latent heat; Gibbs free energy; Theory of enthalpy-entropy. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001200878 |
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| Smaniotto,Thaís A. de S.; Resende,Osvaldo; Sousa,Kelly A. de; Oliveira,Daniel E. C. de; Campos,Rafael C.. |
| ABSTRACT The objectives of this study were to fit different mathematical models to experimental data of drying of sunflower grains, determine and evaluate the effective diffusion coefficient and obtain the activation energy for the process during the drying under various conditions of air. The sunflower grains were collected with an initial moisture content of 0.5267 dry basis (d.b.) and dried in an oven with forced air ventilation under five temperature conditions: 35, 50, 65, 80 and 95 °C, until reaching the moisture content of 0.0934 ± 0.0061 (d.b.). Among the analyzed models, Wang and Singh showed the best fit to describe the drying phenomenon. The effective diffusion coefficient of sunflower grains increased with the increment in air temperature and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mathematical modeling; Heliantus annus; Liquid diffusivity. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000300203 |
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| Oliveira,Daniel E. C. de; Resende,Osvaldo; Costa,Lílian M.; Ferreira Júnior,Weder N.; Igor O. F.,Silva. |
| ABSTRACT With the knowledge on the hygroscopic equilibrium of the baru (Dipteryx alata Vogel) fruit, the product can be adequately handled to maintain the moisture content at the levels recommended for safe storage. Thus, this paper aimed to determine the water desorption isotherms of baru fruits at temperatures of 20, 25, 30 and 35 °C, and water activity between 0.14 and 0.80, and obtain the values of isosteric heat of desorption as a function of the equilibrium moisture content of the product. The equilibrium moisture content was obtained using the static-gravimetric method. Modified Halsey was the best model recommended to represent the hygroscopicity of baru fruits. The recommended moisture contents for safe storage of baru fruits are not more than... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Equilibrium moisture content; Mathematical modeling; Desorption isotherms. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000400279 |
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| Cavalcante,Maisa D.; Plácido,Geovana R.; Oliveira,Daniel E. C. de; Freitas,Bheatriz S. M. de; Cagnin,Caroline; Oliveira,Déborah de S.. |
| ABSTRACT Yellow mombin has high nutritional value but is very perishable. Foam mat drying is a method that has been widely used to preserve liquid and semi-solid powdered foods. In this context, the aim of this study was to determine desorption isotherms and isosteric heat of yellow mombin (Spondias mombin L.) foam for different conditions of temperature and water activity. Powdered yellow mombin pulp was obtained by drying in forced-air oven regulated to 60 ° C. The indirect static method was used to determine the isotherms and isosteric heat, whereas water activity (aw) was determined using the Hygropalm-HP23AW-A analyzer. A B.O.D. incubator, set at 10, 20, 30 and 40 °C, was used to control the temperature, and the water activity for each temperature was... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water activity; Isosteric heat; Hygroscopicity; Mathematical modeling; Spondias mombin L.. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000600436 |
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| Oliveira,Daniel E. C. de; Resende,Osvaldo; Costa,Lílian M.; Silva,Glicélia P.; Sales,Juliana de F.. |
| ABSTRACT ‘Sucupira-branca’ (Pterodon emarginatus Vogel) is a tree from ‘Cerrado’ and stands out mainly for its pharmacological properties; however, there are no technological information about its post-harvest operations. Thus, the aim of this study was to determine the sorption isotherms of ‘sucupira-branca’ fruits for different air conditions and obtain the values of desorption isosteric heat, depending on the equilibrium moisture content of the product. The equilibrium moisture content of ‘sucupira-branca’ fruits was determined by dynamic method for temperatures of 25, 30, 35 and 40 °C and water activities for each temperature between 0.270 and 0.775. The models Chung-Pfost, Copace, Modified Halsey, Oswin Modified and Sigma Copace obtained high... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Equilibrium moisture content; Isotherms; Water activity; Isosteric heat; Copace. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000400285 |
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| Quirino,José R.; Resende,Osvaldo; Fonseca,Natalia N.; Oliveira,Daniel E. C. de; Rosa,Elivânio S.. |
| ABSTRACT Grain sampling requires the use of appropriate and accurate equipment. This study aimed to compare grain samplers, manual and mechanical, used in the sampling of soybean loads, during their reception by storage units. The used devices were the manual sampler with 1.80 m length and three opening stages, 2.10 m length and three opening stages; and 2.10 m length and one opening stage, besides the mechanical sampler (pneumatic) and the pelican sampler. The analyzed parameters were the contents of impurity, broken grains, pods, immature grains, and moisture. The significance of effect of treatment was determined by F Test and the means were compared by Tukey test (p < 0.05). The devices used for sampling of soybean grains in vehicles, during their... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Classification; Grain samplers; Impurities; Pods. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019000300209 |
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| Oliveira,Pâmella M. de; Oliveira,Daniel E. C. de; Resende,Osvaldo; Silva,Daiana V.. |
| ABSTRACT Baru (Dipteryx alata Vogel) is a tree species that is part of the group of native species of the Cerrado and occurs mainly in Central Brazil, being valued for its various uses. Thus, the present work was carried out with the objective of studying the kinetics of drying of the mesocarp of baru fruits, performing the analysis of the thermodynamic properties, as well as evaluating the effect of drying on the color of the flour produced from the mesocarp. The mesocarp of baru fruits was placed in stainless steel trays, and dried at 40, 50, 60 and 70 ºC in a forced circulation oven until the moisture content of 0.12 dry basis (d.b.) was reached. Subsequently, the experimental data of the drying were adjusted with the mathematical models frequently... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Moisture content; Color analysis; Thermodynamic properties. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018001200872 |
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| Guimarães,Rafaiane M.; Oliveira,Daniel E. C. de; Resende,Osvaldo; Silva,Jhessika de S.; Rezende,Thaisa A. M. de; Egea,Mariana B.. |
| ABSTRACT ‘Okara’ is the insoluble part obtained after the aqueous extraction of soybeans, generated in large quantities as a by-product of the ‘tofu’ industry or soybean water-soluble extract. This work aimed to study ‘okara’ convective drying kinetics, determine the effective diffusion coefficient, and obtain activation energy and thermodynamic properties under different drying conditions. The by-product ‘okara’ was obtained from the processing of BRS 257 soybean water-soluble extract, homogenized and dried in a forced-air oven at temperatures of 40, 50, 60 and 70 °C until constant weight. Among the analysed models, Wang & Singh was selected to represent the drying phenomenon. Effective diffusion coefficient increased with the temperature rise, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mathematical modeling; Activation energy; Diffusion coefficient. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000600418 |
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| Freitas,Bheatriz S. M. de; Cavalcante,Maisa D.; Cagnin,Caroline; Silva,Richard M. da; Plácido,Geovana R.; Oliveira,Daniel E. C. de. |
| ABSTRACT 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... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Drying kinetics; Diffusion; Mathematical modeling. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662018000600430 |
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| Barbosa,Karine F.; Sales,Juliana de F.; Resende,Osvaldo; Oliveira,Daniel E. C. de; Zuchi,Jacson; Sousa,Kelly A. de. |
| ABSTRACT The objective of this study was to determine the desorption isotherms of 'cajuzinho-do-cerrado' achenes (Anacardium humile St. Hil.) in various conditions of temperature and water activity, as well as to select the one that best represents the phenomenon and to determine the isosteric heat of desorption. The fruits were collected at the Emas National Park, in the municipality of Mineiros-GO, Brazil, pulped and then subjected to drying in silica gel at temperature of 25 ± 2 °C until the moisture contents of 17.6, 13.6, 11.1, 8.7 and 5.3 (d.b.%). After drying, the desorption isotherms were determined by the indirect static method. The water activity (Aw) was determined at different temperatures, and the achenes were placed in a B.O.D. chamber,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anacardium humile St. Hil.; Hygroscopicity; Water activity.. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000500481 |
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| Registros recuperados: 19 | |
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