Abstract
Paddy rice samples were parboiled by soaking at 65°C for 180min and steaming at 96°C for 2–10min, and then dried to achieve the final moisture content of 11%±1%. The degree of starch gelatinization (DSG) and several quality attributes (head rice yield (HRY), color value and hardness) of parboiled rice were measured. Results showed that DSG (46.8%–77.9%), color value (18.08–19.04) and hardness (118.6–219.2N) all increased following steaming. In contrast, the HRY increased (64.8%–67.1%) for steaming times between 2–4min but decreased (67.1%–65.0%) for steaming times between 4–10min. Linear relations between DSG and color value (R2=0.87), and DSG and hardness (R2=0.88) were observed. The suitable DSG of parboiled rice leading to the highest HRY was found to be 62.5%, obtained following 4min of steaming.
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