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Dimension Measurement and Fissuring of Rice Kernels During Moisture Sorption by Image Analysis
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 063080, 2006 ASAE Annual Meeting . @2006
Authors: Naoto SHIMIZU, M. A. HAQUE, M. ANDERSSON, Toshinori KIMURA
Keywords: brown rice, moisture, sorption, fissure, dimension, image analysis
Fissuring associated with kernel expansion was evident in a moisture-adsorbing environment with RH; 88.72% with moisture content from 6% (d.b.) to 16.3% (d.b.). The average kernel dimensions (length, width) were measured during the sorption test using a Cervitec Grain Inspector, equipped with two digital cameras. The average kernel dimensions changed from 4.86 mm to 5.50mm in length and from 2.75 mm to 2.86 mm in width. Dimension measurements were conducted with three cultivars of brown rice kernels belonging to Japonica rice at a temperature of 15 Ž. The samples were exposed to both a moisture-adsorbing environment and a moisture-desorbing environment with relative humidities (RH) 23.4, 55.9, 70.98 and 88.72%. As an example of the results, no kernel fissuring occurred in the moisture-desorbing environment with RH; 23.4% even when the moisture content was reduced to as low as 6% (d.b.) from 23.3% (d.b.). The average kernel dimensions changed from 5.13 mm to 4,84 mm in length and 2.9 mm to 2.73 mm in width. The results of the kernel dimensions measured with the Cervitec Grain Inspector changed in rice kernels as expected during moisture-adsorbing and moisture-desorbing tests. Kernels fissured when exposed to a moisture-adsorbing environment for the conditions evaluated herein.