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Using Thermogravimetric Analysis to Measure the Drying Rates of Individual Rice Kernels

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Applied Engineering in Agriculture. 32(6): 899-907. (doi: 10.13031/aea.32.11740) @2016
Authors:   Maria Alejandra Billiris, Terry J Siebenmorgen, Taylor Salyer
Keywords:   Drying curves, Individual rough rice kernels, Rice kernel dimensions.

Abstract. Individual kernel drying rates could be used to better estimate intra-kernel MC and material state gradients, which in turn would help estimate the occurrence of kernel fissuring inside rice dryers. Drying curves of individual kernels were obtained using a thermogravimetric analyzer for three long-grain cultivars (Wells, CL XL745, and CL 142) and two medium-grain cultivars (CL 261 and Jupiter) at 40°C, 50°C, and 60°C. Drying rates of individual kernels were obtained from drying curves using a three-parameter, exponential decay model. Prior to drying experiments, kernel thickness, width and length of individual rough rice kernels were measured using a digital micrometer. Total lipid content, amylose content, protein content and initial moisture content were determined for each cultivar. In general, drying rate increased as kernel thickness decreased for both long-grain and medium-grain cultivars; this effect was more pronounced at 60°C. Kernel width was also a factor that affected drying rates; as kernel width increased, drying rate increased.

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