doi:10.1094/CCHEM-84-2-0119 |  VIEW ARTICLE

Effect of Moisture Content at Harvest and Degree of Milling (Based on Surface Lipid Content) on the Texture Properties of Cooked Long-Grain Rice.

Mohammed I. Saleh (1) and Jean-Francois Meullenet (1,2). (1) Department of Food Science, University of Arkansas, 2650 N. Young Avenue, Fayetteville, AR 72704. (2) Corresponding author. Phone: 479-575-6822. E-mail: <jfmeull@uark.edu> Cereal Chem. 84(2):119-124. Accepted October 31, 2006. Copyright 2007 AACC International, Inc.

The effects of the degree of milling (based on surface lipids content [SLC]) on cooked rice physicochemical properties were investigated. Head rice yield (HRY), protein, and SLC decreased with increasing milling, while the percent of bran removed and whiteness increased. Results showed that SLC significantly (P < 0.05) affected milled as well as cooked rice properties across cultivar, moisture content (MC) at harvest, and location (Stuttgart, AR, and Essex, MO). Cooked rice firmness ranged from 90.12 to 111.26 N after milling to various degrees (SLC). The decrease in cooked rice firmness with increasing milling was attributed to the lowering of total proteins and SLC. Cooked rice water uptake increased with increasing degree of milling. Water uptake by the kernel during cooking dictated the cooked rice firmness. The increase in cooked rice stickiness with increasing degree of milling was attributed to an increase in starch leaching during cooking because of the greater starch granule swelling associated with a greater water uptake.