The use of a diffusional model in determining the permeability of corn pericarp
Fick's diffusional model was used to fit drying curves of corn kernel in which the endosperm and germ were modeled as a homogeneous sphere with the pericarp being part of the external mass transfer resistance. Drying curves of whole and dehulled kernels were determined at 50°C and 60°C together...
Guardado en:
| Autor principal: | |
|---|---|
| Otros Autores: | , |
| Formato: | Capítulo de libro |
| Lenguaje: | Inglés |
| Publicado: |
1990
|
| Acceso en línea: | Registro en Scopus DOI Handle Registro en la Biblioteca Digital |
| Aporte de: | Registro referencial: Solicitar el recurso aquí |
| Sumario: | Fick's diffusional model was used to fit drying curves of corn kernel in which the endosperm and germ were modeled as a homogeneous sphere with the pericarp being part of the external mass transfer resistance. Drying curves of whole and dehulled kernels were determined at 50°C and 60°C together with the equilibrium moisture contents at the respective temperatures. Diffusion coefficients for the corn kernel without pericarp and for the pericarp alone were determined by fitting the experimental drying curves to the diffusional model. It was found that moisture diffuses about eight times faster through the endosperm and germ than through the pericarp. The permeabilities of the pericarp at 50°C and 60°C were 1·8 × 10-7 and 1·6 × 10-7 g cm/cm2 atm s, respectively. © 1990. |
|---|---|
| Bibliografía: | Crank, Park, (1968) Diffusion in Polymers, , Academic Press, London and New York Henderson, Physical absorption of non-uniform surfaces (1952) J. Chem. Phys., 33, pp. 29-32 Luikov, (1968) Analytical Heat Diffusion Theory, , Academic Press, London and New York MacMasters, Important aspects of kernel structure (1962) Transactions of the ASAE, 5, pp. 247-249 Purdy, Crane, Influence of pericarp on diffusional drying rate in ‘Mature’ corn (1967) Crop Science, 7, pp. 379-381 Suarez, Effectiveness of ethyl oleate dipping, steam blanching and other pretreatments on drying of corn kernels (1987) Lebensm.-Wiss. u.-Technol., 20, pp. 123-127 Suarez, Loncin, Chirife, A preliminary study on the effect of ethyl oleate dipping treatment on drying rate of grain corn (1984) Journal of Food Science, 49, pp. 236-238 Syarief, Gustafson, Morey, Moisture diffusion coefficients for yellow-dent corn components (1987) Trans. ASAE, 30 (2), pp. 522-528 Walton, White, Ross, A cellular diffusion-based drying model of corn (1988) Trans. ASAE, 31 (1), pp. 279-283 Wolf, Buzan, MacMasters, Rist, Structure of the mature corn kernel. II. Microscopic structure of pericarp, seed, coat, and hilar layer of dent corn (1952) Cereal Chemistry, 29, pp. 335-347 |
| ISSN: | 02608774 |
| DOI: | 10.1016/0260-8774(90)90019-5 |