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Determining minimum tempering durations while maintaining head rice yield.

Cnossen, A. G.; Siebenmorgen, T. J.;

Research Series - Arkansas Agricultural Experiment Station Year: 2000 Issue: No. 476 Pages: 331-339 Ref: 6 ref.

2000

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Determining minimum tempering durations while maintaining head rice yield.

Drying and tempering tests were conducted during the 1998 and 1999 harvest seasons using rice cv. Bengal and Cypress from two locations in Arkansas harvested over a range of moisture contents (MCs) (22 to 17%). The rice was dried under three air conditions, two with a drying air temperature above the glass transition temperature (Tg) of the rice, and one below Tg, in order to test the Tg-hypothesis of fissuring proposed by Perdon and Siebenmorgen (1999), which relates milling quality reduction to Tg. Four drying durations were used, resulting in 1.5, 3, 4.5, and 6 percentage points MC (PPMC) loss. After drying, the samples were tempered for varying time periods ranging from 0 to 4 hr. at the same temperature as the dryer. Results indicate that tempering duration after a drying pass has a significant influence on head rice yield (HRY). Results for both Bengal and Cypress show that 5 to 6 PPMC can be removed per drying pass without damaging the rice kernel, as long as sufficient tempering is allow

ed. Required tempering durations were shorter for Cypress than for Bengal.