Safe storage of tobacco leaves in different environment conditions
Autor(a) principal: | |
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Data de Publicação: | 2016 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Revista de Ciências Agrárias (Belém. Online) |
Texto Completo: | https://ajaes.ufra.edu.br/index.php/ajaes/article/view/2105 |
Resumo: | Water properties and its relation with agricultural compounds affect post-harvest procedures, being correlated to sorption isotherms. Guggenheim–Anderson–de Boer (GAB) model is usually used to describe isotherms due to the physical aspects of its parameters. Thus, this work aimed to acquire desorption isotherms of tobacco leaves (Nicotiana tabacum L.) with initial moisture content of 87 % (w.b.), and to determine thermodynamic properties of this process. Equilibrium moisture content (Xeq) of tobacco leaves was obtained by dynamic method in different temperatures (15, 25, 35, 45 and 55 ºC) and relative humidities (10, 20, 40, 60 and 75 %) of the air. Experimental data of Xeq was fitted to GAB model, in which adequately represented the isotherms. Xeq increased with relative humidity increment and decreased with temperature increase at a constant value of relative humidity. Monolayer moisture content increased and remaining parameter values of GAB model decreased with temperature increase, indicating that air condition affect the interaction between multilayer and free moisture. Thermodynamic properties calculated were activation energy, enthalpy, entropy and Gibbs free energy. Activation energy was 0.3172 kJ kg-1. Remaining properties decreased with equilibrium moisture content increase. |
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Safe storage of tobacco leaves in different environment conditionsCondições ambientais seguras para o armazenamento de folhas de fumoWater properties and its relation with agricultural compounds affect post-harvest procedures, being correlated to sorption isotherms. Guggenheim–Anderson–de Boer (GAB) model is usually used to describe isotherms due to the physical aspects of its parameters. Thus, this work aimed to acquire desorption isotherms of tobacco leaves (Nicotiana tabacum L.) with initial moisture content of 87 % (w.b.), and to determine thermodynamic properties of this process. Equilibrium moisture content (Xeq) of tobacco leaves was obtained by dynamic method in different temperatures (15, 25, 35, 45 and 55 ºC) and relative humidities (10, 20, 40, 60 and 75 %) of the air. Experimental data of Xeq was fitted to GAB model, in which adequately represented the isotherms. Xeq increased with relative humidity increment and decreased with temperature increase at a constant value of relative humidity. Monolayer moisture content increased and remaining parameter values of GAB model decreased with temperature increase, indicating that air condition affect the interaction between multilayer and free moisture. Thermodynamic properties calculated were activation energy, enthalpy, entropy and Gibbs free energy. Activation energy was 0.3172 kJ kg-1. Remaining properties decreased with equilibrium moisture content increase.As propriedades da água e sua relação com os componentes dos produtos agrícolas afetam os procedimentos pós-colheita, sendo estas relacionadas pelas isotermas de sorção. O modelo de Guggenheim–Anderson–de Boer (GAB) é usualmente utilizado para descrever as isotermas devido aos seus parâmetros relacionarem aspectos físicos do processo. Assim, objetivou-se com este trabalho obter as isotermas de dessorção de folhas de fumo (Nicotiana tabacum L.), bem como determinar as propriedades termodinâmicas deste processo. O teor de água de equilíbrio (Xeq) das folhas de fumo foi obtido por meio do método dinâmico em diferentes temperaturas (15, 25, 35, 45 e 55 °C) e umidades relativas (10, 20, 40, 60 e 75%) do ar. Os dados experimentais de Xeq foram ajustados ao modelo de GAB, no qual representou adequadamente as isotermas. Para uma isoterma, o Xeqaumentou com o incremento de umidade relativa e diminuiu com o aumento da temperatura do ar a um valor de umidade relativa constante. O teor de água da monocamada aumentou e os valores dos parâmetros restantes do modelo de GAB decresceram com o aumento da temperatura, indicando que a condição do ar afetou a interação entre a multicamada e a água livre. As propriedades termodinâmicas calculadas foram a energia de ativação, a entalpia, a entropia e a energia livre de Gibbs. A energia de ativação foi de 0,3172 kJ kg–1. As propriedades remanescentes decresceram com o aumento do teor de água de equilíbrio.Universidade Federal Rural da Amazônia/UFRA2016-11-25info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://ajaes.ufra.edu.br/index.php/ajaes/article/view/2105Amazonian Journal of Agricultural Sciences Journal of Agricultural and Environmental Sciences; Vol 59 No 2 (2016): RCA; 106-112Revista de Ciências Agrárias Amazonian Journal of Agricultural and Environmental Sciences; v. 59 n. 2 (2016): RCA; 106-1122177-87601517-591Xreponame:Revista de Ciências Agrárias (Belém. Online)instname:Universidade Federal Rural da Amazônia (UFRA)instacron:UFRAporhttps://ajaes.ufra.edu.br/index.php/ajaes/article/view/2105/844Corrêa, Paulo CesarOliveira, Gabriel Henrique Horta deOliveira, Ana Paula Lelis Rodrigues deGoneli, André Luis DuarteSilva, Marley Garciainfo:eu-repo/semantics/openAccess2017-07-18T17:33:41Zoai:ojs.www.periodicos.ufra.edu.br:article/2105Revistahttps://ajaes.ufra.edu.br/index.php/ajaes/PUBhttps://ajaes.ufra.edu.br/index.php/ajaes/oaiallan.lobato@ufra.edu.br || ajaes.suporte@gmail.com2177-87601517-591Xopendoar:2017-07-18T17:33:41Revista de Ciências Agrárias (Belém. Online) - Universidade Federal Rural da Amazônia (UFRA)false |
dc.title.none.fl_str_mv |
Safe storage of tobacco leaves in different environment conditions Condições ambientais seguras para o armazenamento de folhas de fumo |
title |
Safe storage of tobacco leaves in different environment conditions |
spellingShingle |
Safe storage of tobacco leaves in different environment conditions Corrêa, Paulo Cesar |
title_short |
Safe storage of tobacco leaves in different environment conditions |
title_full |
Safe storage of tobacco leaves in different environment conditions |
title_fullStr |
Safe storage of tobacco leaves in different environment conditions |
title_full_unstemmed |
Safe storage of tobacco leaves in different environment conditions |
title_sort |
Safe storage of tobacco leaves in different environment conditions |
author |
Corrêa, Paulo Cesar |
author_facet |
Corrêa, Paulo Cesar Oliveira, Gabriel Henrique Horta de Oliveira, Ana Paula Lelis Rodrigues de Goneli, André Luis Duarte Silva, Marley Garcia |
author_role |
author |
author2 |
Oliveira, Gabriel Henrique Horta de Oliveira, Ana Paula Lelis Rodrigues de Goneli, André Luis Duarte Silva, Marley Garcia |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Corrêa, Paulo Cesar Oliveira, Gabriel Henrique Horta de Oliveira, Ana Paula Lelis Rodrigues de Goneli, André Luis Duarte Silva, Marley Garcia |
description |
Water properties and its relation with agricultural compounds affect post-harvest procedures, being correlated to sorption isotherms. Guggenheim–Anderson–de Boer (GAB) model is usually used to describe isotherms due to the physical aspects of its parameters. Thus, this work aimed to acquire desorption isotherms of tobacco leaves (Nicotiana tabacum L.) with initial moisture content of 87 % (w.b.), and to determine thermodynamic properties of this process. Equilibrium moisture content (Xeq) of tobacco leaves was obtained by dynamic method in different temperatures (15, 25, 35, 45 and 55 ºC) and relative humidities (10, 20, 40, 60 and 75 %) of the air. Experimental data of Xeq was fitted to GAB model, in which adequately represented the isotherms. Xeq increased with relative humidity increment and decreased with temperature increase at a constant value of relative humidity. Monolayer moisture content increased and remaining parameter values of GAB model decreased with temperature increase, indicating that air condition affect the interaction between multilayer and free moisture. Thermodynamic properties calculated were activation energy, enthalpy, entropy and Gibbs free energy. Activation energy was 0.3172 kJ kg-1. Remaining properties decreased with equilibrium moisture content increase. |
publishDate |
2016 |
dc.date.none.fl_str_mv |
2016-11-25 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://ajaes.ufra.edu.br/index.php/ajaes/article/view/2105 |
url |
https://ajaes.ufra.edu.br/index.php/ajaes/article/view/2105 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://ajaes.ufra.edu.br/index.php/ajaes/article/view/2105/844 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal Rural da Amazônia/UFRA |
publisher.none.fl_str_mv |
Universidade Federal Rural da Amazônia/UFRA |
dc.source.none.fl_str_mv |
Amazonian Journal of Agricultural Sciences Journal of Agricultural and Environmental Sciences; Vol 59 No 2 (2016): RCA; 106-112 Revista de Ciências Agrárias Amazonian Journal of Agricultural and Environmental Sciences; v. 59 n. 2 (2016): RCA; 106-112 2177-8760 1517-591X reponame:Revista de Ciências Agrárias (Belém. Online) instname:Universidade Federal Rural da Amazônia (UFRA) instacron:UFRA |
instname_str |
Universidade Federal Rural da Amazônia (UFRA) |
instacron_str |
UFRA |
institution |
UFRA |
reponame_str |
Revista de Ciências Agrárias (Belém. Online) |
collection |
Revista de Ciências Agrárias (Belém. Online) |
repository.name.fl_str_mv |
Revista de Ciências Agrárias (Belém. Online) - Universidade Federal Rural da Amazônia (UFRA) |
repository.mail.fl_str_mv |
allan.lobato@ufra.edu.br || ajaes.suporte@gmail.com |
_version_ |
1797231628441878528 |