Desorption isotherms and isosteric heat of 'cajuzinho-do-cerrado' achenes

Barbosa, Karine Feliciano; Sales, Juliana de Fátima; Resende, Osvaldo; Oliveira, Daniel Emanuel Cabral de; Zuchi, Jacson; Sousa, Kelly Aparecida de

doi:10.1590/1807-1929/agriambi.v20n5p481-486

Cited by 8 publications

(10 citation statements)

References 15 publications

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“…Thus, 'sucupirabranca' fruits should be stored with moisture contents close to the maximum recommended for each temperature, because the amount of energy necessary to reduce the moisture content is large. Caetano et al (2012) and Barbosa et al (2016) observed the same behavior for the seeds of 'caju-de-árvore-do-cerrado' and 'cajuzinho-do-cerrado' , respectively.…”

Section: Resultsmentioning

confidence: 63%

“…Temperature influences the hygroscopicity of 'sucupirabranca' fruits and this behavior has been observed for most agricultural products (Goneli et al, 2013;Corrêa et al, 2014;Silva et al, 2015;Barbosa et al, 2016;Sousa et al, 2016). To obtain the same water activity, the equilibrium moisture content decreases with the increment in temperature or, similarly, for a same equilibrium moisture content, the increase of temperature requires an increase in water activity (Figure 1), i.e., for a safe storage in environments with high temperatures and water activity, it is necessary to reduce the water content of the 'sucupira-branca' fruits.…”

Section: Resultsmentioning

confidence: 86%

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Hygroscopicity of ‘sucupira-branca’ (Pterodon emarginatus Vogel) fruits

Oliveira

Resende

Costa

et al. 2017

Rev. bras. eng. agríc. ambient.

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A B S T R A C T'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 coefficient of determination (R 2 ) and low chisquare (χ 2 ), relative mean error (P) and estimated mean error (SE), and the Copace model was selected to represent the desorption isotherms. The isosteric heat increases with the reduction of equilibrium moisture content and required more energy to remove water from the 'sucupira-branca' fruit.Higroscopicidade dos frutos de sucupira-branca (Pterodon emarginatus Vogel) R E S U M OA sucupira-branca (Pterodon emarginatus Vogel) é uma árvore do Cerrado e se destaca principalmente por suas propriedades farmacológicas; entretanto, inexistem informações tecnológicas sobre as operações de pós-colheita. Desta forma, objetivou-se, com este trabalho, determinar as isotermas de dessorção dos frutos de sucupira-branca para diferentes condições do ar, bem como obter os valores do calor isostérico de dessorção em função do teor de água de equilíbrio do produto. O teor de água de equilíbrio dos frutos de sucupira-branca foi determinado pelo método dinâmico para temperaturas de 25, 30, 35 e 40 °C e atividades de água para cada temperatura, entre 0,270 a 0,775. Os modelos Chung-Pfost, Copace, Halsey Modificado, Oswin Modificado e Sigma Copace obtiveram elevado coeficiente de determinação (R 2 ) e baixo Qui-quadrado (χ 2 ), erro médio relativo (P) e estimado (SE), sendo o modelo de Copace selecionado para representar as isotermas de dessorção. O calor isostérico aumenta com a redução do teor de água de equilíbrio, sendo relevante maior quantidade de energia para retirar a água dos frutos de sucupira-branca.

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Section: Resultsmentioning

confidence: 63%

Section: Resultsmentioning

confidence: 86%

Hygroscopicity of ‘sucupira-branca’ (Pterodon emarginatus Vogel) fruits

Oliveira

Resende

Costa

et al. 2017

Rev. bras. eng. agríc. ambient.

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“…The dependence of the equilibrium water content of a given product with relative humidity and equilibrium temperature can be expressed by mathematical equations, which are called sorption isotherms or hygroscopic equilibrium curves (Correa et al, 2014). The sorption isotherms that can be obtained by means of mathematical models and the other thermodynamic properties, have been studied by several researchers Barbosa et al, 2016;Corrêa et al, 2017;da Silva et al, 2015;de Oliveira et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Moisture sorption isotherms of sunflower seeds: Thermodynamic analysis

et al. 2019

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The study of the thermodynamic properties provides the knowledge of the sorbent affinity by the water and the spontaneity of the sorption process, important to design drying equipment and to predict hygroscopic behavior during storage. This work aimed to determine and evaluate isotherms of hygroscopic equilibrium and thermodynamic properties for different equilibrium conditions (water contents and temperatures) in sunflower seeds, using the indirect static method. Sunflower seeds with initial water content of 0.164 (decimal, dry basis - d.b.) were used. Fifteen mathematical models were tested for hygroscopic equilibrium modeling, and the Smith model presented the best fit. It was verified that the thermodynamic properties were influenced by the water content, the integral isosteric desorption heat increased with the decrease of the equilibrium water content, ranging from 1.787 to 2.670 kJ kg-1 to 0.198 to 0.0518 (decimal, d.b.), respectively, the desorption process of the sunflower seeds was controlled by the enthalpy and the Gibbs free energy, which varied from 3.6363 to 200.1730 kJ kg-1, was positive for the temperatures studied, with increase to during the desorption process, proving to be a non-spontaneous process.

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“…Hil.) (Barbosa et al, 2016), pequi diaspore (Caryocar brasiliense, CAMB.) (Sousa, Resende, & Carvalho, 2016).…”

Section: Resultsmentioning

confidence: 99%

Isotherms and Isosteric Heat Desorption of Hymenaea stigonocarpa Mart. Seeds

Ferreira¹,

Resende²,

Oliveira³

et al. 2018

JAS

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The Brazilian Cerrado is one of the most important ecosystems and due to the extractivism it is necessary to recover the degraded areas. The tree of Hymenaea stigonocarpa Mart. is used in this reforestation system, so the study of post-harvest management of the seed is necessary for the propagation. The objective of this work was to determine the isotherms and the isosteric desorption heat of Hymenaea stigonocarpa Mart. Seeds, and to test the methodology of the Akaike’s information criterion (AIC) and Schwarz’s bayesian information criterion (BIC) for the choice of the best mathematical model. Different mathematical models were fitted to the experimental data and the model that best represents the phenomenon was selected, from the statistical parameters. To obtain the equilibrium moisture content was used static method using desiccants in incubators cameras with control of relative humidity by salt solution. The Oswin Modified model obtained better results according to analyzed parameters, being this model the one selected for prediction of the hygroscopic balance of the Hymenaea stigonocarpa Mart. seeds. It was found that the higher the temperature for the same equilibrium moisture content, the higher the water activity values. The AIC and BIC methodology contributed to the choice of the best mathematical model to predict the hygroscopicity phenomenon. The isosteric heat increased with the decrease in the equilibrium moisture content requiring a greater amount of energy to remove water from the seeds.

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Desorption isotherms and isosteric heat of 'cajuzinho-do-cerrado' achenes

Cited by 8 publications

References 15 publications

Hygroscopicity of ‘sucupira-branca’ (Pterodon emarginatus Vogel) fruits

Hygroscopicity of ‘sucupira-branca’ (Pterodon emarginatus Vogel) fruits

Moisture sorption isotherms of sunflower seeds: Thermodynamic analysis

Isotherms and Isosteric Heat Desorption of Hymenaea stigonocarpa Mart. Seeds

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