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      Desorption isotherms and isosteric heat of araticum (Annona crassiflora Mart.) seeds Translated title: Isotermas de dessorção e calor isostérico de sementes de araticum (Annona crassiflora Mart.)

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          Abstract

          ABSTRACT The objective of this study was to determine the desorption isotherms and isosteric heat of Annona crassiflora Mart. seeds, using Akaike information criterion (AIC) and Schwarz’s Bayesian information criterion (BIC) to assist in the choice of the nonlinear regression model. The desorption isotherms were determined by indirect static method and water activity was obtained using the instrument HygroPalm; the product was put in the device in B.O.D. chamber set at 10, 20, 30 and 40 °C. Several nonlinear regression models were fitted to the experimental data by the Gauss-Newton method. The desorption isotherms of Annona crassiflora Mart. seeds can be represented by the models of Chung-Pfost, Copace, Modified GAB, Modified Henderson, Modified Oswin, Sabbah and Sigma Copace. However, the Sigma Copace model showed better fit to the experimental data, with lower AIC and BIC values, being chosen to represent the desorption isotherms of Annona crassiflora Mart seeds. Isosteric heat increased with decreasing moisture content, requiring a greater amount of energy to remove water from seeds, with values ranging from 2541.64 to 2481.56 kJ kg-1, for the moisture content range from 5.69 to 14.93% on a dry basis.

          Translated abstract

          RESUMO Objetivou-se, com este estudo, determinar as isotermas de dessorção e o calor isostérico das sementes de Annona crassiflora Mart., utilizando os critérios de informação de Akaike (AIC) e informação bayesiano de Schwarz (BIC) para auxiliar na escolha do modelo de regressão não linear. As isotermas de dessorção foram determinadas pelo método estático indireto e a atividade de água foi obtida por meio do equipamento HygroPalm; o produto foi acondicionado no equipamento em B.O.D. regulada a 10, 20, 30 e 40 °C. Os dados experimentais foram ajustados a diversos modelos de regressão não linear, pelo método Gauss-Newton. As isotermas de dessorção de sementes de Annona crassiflora Mart. podem ser representadas pelos modelos de Chung-Pfost, Copace, GAB Modificado, Henderson Modificado, Oswin Modificado, Sabbah e Sigma Copace. Contudo, o modelo Sigma Copace apresentou melhor ajuste aos dados experimentais, com memores valores de AIC e BIC, sendo escolhido para representar as isotermas de dessorção das sementes de Annona crassiflora Mart. O calor isostérico aumentou com a diminuição do teor de água, sendo necessária maior quantidade de energia para retirar a água das sementes, com valores variando de 2541,64 a 2481,56 kJ kg-1, para a faixa do teor de água de 5,69 a 14,93% base seca.

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          Drying kinetics of crushed mass of ‘jambu’: Effective diffusivity and activation energy

          ABSTRACT The aim of this paper was to analyze the drying kinetics, test the Akaike information criterion (AIC) and Schwarz’s Bayesian information criterion (BIC) in the selection of models, determine the effective diffusivity and activation energy of the crushed mass of ‘jambu’ leaves for different conditions of temperature and layer thicknesses. The experiment was carried out at the Food Laboratory of the Brazilian Agricultural Research Corporation (Embrapa) in Macapá-AP. Drying was carried out in air circulation oven with speed of 1.0 m s-1 at various temperatures (60, 70 and 80 ºC) and layer thicknesses (0.005 and 0.010 m). The experimental data were fitted to 11 mathematical models. Coefficient of determination (R2), mean relative error (P), mean estimated error (SE), Chi-square test (χ2), AIC and BIC were the selection criteria for the models. For the effective diffusivity, the Fick’s diffusion model was used considering the flat plate geometry. It was found that Midilli and Logarithmic models showed the best fit to the experimental data of drying kinetics. Effective diffusion coefficient increases with increment in the thickness of the material and with the temperature elevation. Activation energy of the material was of 16.61 kJ mol-1 for the thickness of 0.005 m, and 16.97 kJ mol-1 for the thickness of 0.010 m. AIC and BIC can be additionally included to select models of drying.
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            Higroscopicidade das sementes de pimenta (Capsicum chinense L.)

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              Isotermas e calor isostérico das sementes de pinhão-manso

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                Author and article information

                Journal
                rbeaa
                Revista Brasileira de Engenharia Agrícola e Ambiental
                Rev. bras. eng. agríc. ambient.
                Departamento de Engenharia Agrícola - UFCG (Campina Grande, PB, Brazil )
                1415-4366
                1807-1929
                September 2020
                : 24
                : 9
                : 630-636
                Affiliations
                [2] Iporá GO orgnameInstituto Federal de Educação, Ciência e Tecnologia Goiano Brasil oliveira.d.e.c@ 123456gmail.com
                [1] Rio Verde GO orgnameInstituto Federal de Educação, Ciência e Tecnologia Goiano Brasil wedernunesift,@ 123456gmail.com
                Article
                S1415-43662020000900630 S1415-4366(20)02400900630
                10.1590/1807-1929/agriambi.v24n9p630-636
                ae8e5d7a-fdaf-42d3-827a-337a3599a4d7

                This work is licensed under a Creative Commons Attribution 4.0 International License.

                History
                : 30 June 2020
                : 13 February 2019
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 30, Pages: 7
                Product

                SciELO Brazil

                Categories
                Articles

                BIC,Sigma Copace,AIC,higroscopicidade,hygroscopicity
                BIC, Sigma Copace, AIC, higroscopicidade, hygroscopicity

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