Abstract
ABSTRACT THE head rice (whole kernel) yield of long-grain rough rice ranging from 7.6 to 19.2% initial moisture content was determined after subjecting the rice to moisture adsorption conditions. The conditions ranged from those representing severe moisture adsorption environmentssoaking in water, misting with water, equilibrating to a 95% relative humidity environmentto less severe methods created by mixing low and high moisture content rice in proportions of 3:1, 1:1, and 1:3. All methods showed significant reduction in head rice yield when the moisture content at which remoistening was initiated was lower than 13%. Remoistening of rice at a moisture content above 16% had no discernable effect on head rice yields. Head rice yields lower than 2% were produced by severe moisture adsorption treatments when rice at 7.6% moisture content was remoistened. The effects of the moisture adsorption treatments on head rice yields were accurately described by a two-parameter, sigmoid equation commonly used to present adsorption and desorption isotherms in cereal grains.
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