Using thermogravimetric analysis to measure the drying rates of individual rice kernels

Resumen:: 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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