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| Registros recuperados: 12 | |
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| Ferreira Junior,Weder N.; Resende,Osvaldo; Pinheiro,Gleyce K. I.; Silva,Ligia C. de M.; Costa,Eduarda R.. |
| ABSTRACT The knowledge of hygroscopicity is essential for the storage of tamarind seeds, but there is a limitation of a judicious statistical parameter to define the best mathematical model to adjust the isotherms of plant products. Therefore, this study aimed to determine the desorption isotherms of tamarind seeds and test the Akaike information criterion (AIC) and Schwarz Bayesian information criterion (BIC) for choosing the best mathematical model. Seeds with an initial moisture content of 21.00 ± 0.10% dry basis (db) were dried at 45 °C until they reached moisture contents of 17.27 ± 0.10, 15.04 ± 0.16, 14.14 ± 0.06, 12.41 ± 0.17, and 10.52 ± 0.12% db. The water activity of the product was determined by the static-indirect method at temperatures of 10,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water activity; Hygroscopicity; Cavalcanti Mata. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162020000400511 |
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| Souza, Adilson Pacheco de; Stangerlin, Diego Martins; Melo, Rafael Rodolfo de; Uliana, Eduardo Morgan. |
| Por ser um material orgânico, heterogêneo e higroscópico, a madeira pode apresentar variações dimensionais e deformações decorrentes da interação com o ambiente. Em uso ou nos processos de secagem, quando são atingidos os equilíbrios entre a madeira e o ar atmosférico, têm-se a obtenção da umidade de equilíbrio da madeira (UEM). Em função da elevada importância dessa matéria-prima para o Estado de Mato Grosso, torna-se fundamental conhecer a sazonalidade de UEM. O presente trabalho objetivou estimar a UEM da madeira, pelo modelo de Simpson, para 30 municípios do Estado de Mato Grosso, distribuídos nas diferentes regiões de planejamento do Zoneamento Sócio-Econômico Ecológico do Estado. Os dados meteorológicos foram obtidos da Rede de Estações... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Recursos florestais; Agrometeorologia Climatologia; Secagem natural; Higroscópico Weather; Natural drying; Hygroscopicity. |
| Ano: 2016 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/811 |
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| Pertuzzatti, Anderson; Missio, André Luiz; Gatto, Darci Alberto; Farias, Jorge Antônio; Haselein, Clóvis Roberto. |
| O presente estudo visou avaliar tratamentos térmicos na madeira sob atmosfera de glicerina, que é resíduo da indústria de biodiesel, além de direcionar o produto obtido para os nichos de mercado da indústria madeireira. Foram selecionadas seis árvores de Eucalyptus grandis e E. cloeziana provenientes de plantios homogêneos com 21 anos. Dessas, foram confeccionados os corpos de prova e encaminhados para um banho de óleo laboratorial contendo glicerina bruta pré-aquecida a 50 °C. Os tratamentos consistiram no aquecimento da madeira em atmosfera de glicerina a 125 °C e 165 °C, por 30 min, além das amostras controle. Na sequência, foi quantificada a variação percentual de massa, o teor de umidade de equilíbrio e a absorção máxima de água. Ainda, foram... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tecnologia da Madeira; Tratamentos térmicos Biodiesel; Higroscopicidade; Colorimetria Biodiesel; Hygroscopicity; Colorimetry. |
| Ano: 2016 |
URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1183 |
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| Ribeiro,Luciana C.; Costa,José M. C. da; Afonso,Marcos R. A.. |
| ABSTRACT Powder products are characterized by their practicality and long life. However, fruit powders have high hygroscopicity and tend to agglomerate due to its hydrophilic nature. The isotherms of equilibrium moisture content apply to the study of dehydrated food preservation potential. Acerola is a nutritionally rich fruit, with great economic and industrial potential. The objective of this study was to analyse acerola powder adsorption isotherms obtained by lyophilization and characterize the powder obtained from lyophilized acerola pulp. Analysis of hygroscopicity, solubility and degree of caking were performed. Isotherms were represented by the mathematical models of GAB, BET, Henderson and Oswin, at temperatures of 25, 35 and 45 °C. According to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Malpighia glabra; Hygroscopicity; Drying. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000300269 |
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| Rodrigues,Karen C.; Silva,Hellismar W. da; Silva,Isneider L.; Santos,Samuel G. F. dos; Silva,Daniel P. da; Rodovalho,Renato S.. |
| ABSTRACT Studies related to water sorption in seeds are essential for the design and optimization of storage systems. The objective of this research was to determine and model the adsorption isotherms and calculate the latent heat of water vaporization, differential enthalpy and entropy, the isokinetic theory and Gibbs free energy for ‘Cumari-do-Pará’ pepper seeds. The equilibrium moisture contents were obtained by the static gravimetric method at temperatures of 30, 35 and 40 °C and water activities between 0.290 and 0.900 (decimal). The Chen-Clayton model is the one that best represents the water adsorption isotherms in ‘Cumari-do-Pará’ pepper seeds under the studied conditions, with 9.94% mean relative error, 0.40 mean estimated error and random... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capsicum chinense L.; Hygroscopicity; Latent heat; Isokinetic. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662020000400280 |
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| Lins,Analha D. F.; Rocha,Ana P. T.; Gomes,Josivanda P.; Feitosa,Regilane M.; Araujo,Gilmar T.; Santos,Dyego da C.. |
| ABSTRACT Red mombin is a seasonal fruit and susceptible to degradation reactions due to its high water content. This highlights the need to use processes that prolong its life and make it available all year round, including to markets away from the production sites. Thus, the objective of this study was to produce red mombin pulp powder in spouted bed dryer, evaluate it regarding physical and chemical parameters and assess its hygroscopic behavior at temperatures of 20, 30 and 40 °C, fitting the models of the GAB, Oswin and Peleg to the experimental data. The results of the physical and chemical analyses showed intermediate wetting time of 0.39 g min-1, solubility higher than 60% and mean flowability with Hausner ratio and Carr index of 1.26-1.34 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Spondias purpurea L.; Drying; Hygroscopicity. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000800562 |
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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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| Conegero,Juliana; Ribeiro,Luciana C.; Monteiro,Antonio R. G.; Costa,José M. C. da. |
| ABSTRACT Mangaba is a widely-consumed fruit in the Northeast of Brazil, which is usually exploited through extractivism. This fruit is rich in various nutrients, especially in vitamin C, with pleasant taste and aroma. The lyophilization process transforms these fruits into amorphous powders, which must be analyzed regarding their properties and hygroscopic trend. Thus, the objective of this study was to characterize and evaluate the physico-chemical properties of adsorption isotherms of the lyophilized ‘mangaba’ pulp powder, with addition of maltodextrin (DE 20). The pH, titratable acidity, soluble solids, ascorbic acid and water activity were analyzed. Regarding the isotherms, the mathematical models of GAB, BET, Oswin, and Henderson were used at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hancornia speciosa Gomes; Sorption isotherm; Hygroscopicity; Dehydration. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000500356 |
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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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| Costa,Laiana Oliveira; Lara Junior,Jovan Marques; Costa,José Maria Correia da; Afonso,Marcos Rodrigues Amorim; Rodrigues,Sueli; Wurlitzer,Nédio Jair. |
| ABSTRACT The aim of this work was to study the stability of powdered mango pulp obtained through the process of lyophilisation, as well as its structural characteristics using electron microscopy analysis. In response to an earlier experimental design using maltodextrin concentrations of 0%, 10%, 20% and 30% and periods of 24 and 30 hours, the condition of 20% maltodextrin and 24 hours drying was chosen as the best for drying mango in a freeze dryer. The stability study was therefore carried out using powdered mango pulp obtained under the above best-drying conditions, stored for 90 days and monitored every two weeks by analysis of the moisture, ascorbic acid content, b* colorimetric parameter and hygroscopicity. Storage was at room temperature (27 °C) in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Drying; Maltodextrin; Hygroscopicity; Microstructure. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000200251 |
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| Angel,Ruiz Cabrera Miguel; Espinosa-Muñoz,Lucía Carolina; Aviles-Aviles,Carlos; González-García,Raúl; Moscosa-Santillán,Mario; Grajales-Lagunes,Alicia; Abud-Archila,Miguel. |
| The objective of this study was to assess the effectiveness of the blends with different levels of lactose-maltodextrin (8:5, 10:5, and 12:5 % w/v) during the spray-drying of the passion fruit juice. The drying was carried out in a laboratory spray dryer (Pulvis GB 22 model) at two inlet air temperatures (180 and 190 ºC), and two air pressures (0.10 and 0.20 MPa). The moisture content, hygroscopicity and vitamin C retention were evaluated in the powder obtained. Response surface plots (p<0.05) showed that the lowest values of the moisture content and hygroscopicity were reached in the temperature range of 188-190 ºC and at 12:5 % (w/v) concentration of lactose-maltodextrin; the best vitamin C retention level occurred at 180 ºC and 0.2 MPa. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Passion fruit juice; Spray-drying; Vitamin C retention; Hygroscopicity. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400026 |
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| Registros recuperados: 12 | |
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