Measurement of Water Diffusivities in Barley Components Using Diffusion Weighted Imaging and Validation with a Drying Model

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DOIResolve DOI: http://doi.org/10.1080/07373930802682973
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TypeArticle
Journal titleDrying Technology: An International Journal
Volume27
Issue3
Pages382392; # of pages: 11
SubjectBarley, Magnetic resonance, Modeling, Pore geometry, Restricted diffusion, Water mobility
AbstractDiffusion-weighted magnetic resonance imaging was used to determine water diffusion coefficients (D) in hull-less barley kernel components (endosperm and embryo) at 20.5±0.5°C. The D values in barley components were time-dependent and restricted in nature as indicated by the decrease in the apparent diffusion coefficient with increasing diffusion time (from 3 to 25 ms). A four-parameter Padé approximation model was used to estimate D and pore geometry (pore surface area–to-volume ratio, pore size, porosity, electrical conductivity and permeability of water) of the barley components after long diffusion time (t → ∞) using data obtained during a relatively short period of diffusion. The D of embryo and endosperm were 2.2±0.07 × 10−5 mm 2 2. Czuchajowska , Z. ; Klamczynski , A. ; Paszczynska , B. ; Baik , B.-K. Structure and functionality of barley starches . Cereal Chemistry 1998 , 75 ( 5 ), 747 – 754 . [CrossRef], [Web of Science ®] View all references/s and 1.0±0.10 × 10−5 mm 2 2. Czuchajowska , Z. ; Klamczynski , A. ; Paszczynska , B. ; Baik , B.-K. Structure and functionality of barley starches . Cereal Chemistry 1998 , 75 ( 5 ), 747 – 754 . [CrossRef], [Web of Science ®] View all references/s, respectively. These D values were used to simulate moisture and temperature patterns during the drying of a barley kernel using a two-dimensional simultaneous heat and moisture transfer model and compared with literature D values for validation purposes. Based on the comparison, the D values of barley components obtained from our study can be used to develop realistic models of water transport in barley during different postharvest processing operations (e.g., drying, kilning, steeping).
Publication date
LanguageEnglish
AffiliationNRC Institute for Biodiagnostics; National Research Council Canada
Peer reviewedYes
NPARC number19945996
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Record identifier74ff41bf-f1b5-47f0-a9b7-e3c0d1c07e87
Record created2012-05-11
Record modified2016-05-09
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