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- Title
Desorption isotherms and isosteric heat of 'cajuzinho-do-cerrado' achenes.
- Authors
Barbosa, Karine F.; Sales, Juliana de F.; Resende, Osvaldo; de Oliveira, Daniel E. C.; Zuchi, Jacson; de Sousa, Kelly A.
- Abstract
The objective of this study was to determine the desorption isotherms of 'cajuzinho-docerrado' 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, regulated at 10, 20, 30 and 40 °C. Data of hygroscopic equilibrium moisture content were fitted to different mathematical models through nonlinear regression analysis, using the Gauss-Newton method. The Copace model was the one that best represented the hygroscopicity of 'cajuzinho-do-cerrado' achenes, while the integral isosteric heat of desorption of 'cajuzinho-do-cerrado' achenes for the moisture content range of 4.51 to 13.40 (% d.b.) varied from 2,734.82 to 2,548.49 kJ kg-1.
- Subjects
ACHENES; EFFECT of temperature on plants; SILICA gel; EFFECT of moisture on plants; DESORPTION; PARQUE Nacional das Emas (Brazil)
- Publication
Revista Brasileira de Engenharia Agricola e Ambiental - Agriambi, 2016, Vol 20, Issue 5, p481
- ISSN
1807-1929
- Publication type
Article
- DOI
10.1590/1807-1929/agriambi.v20n5p481-486