Effects of Steeping on Physicochemical Properties of Waxy Rice

Effects of steeping of waxy rice in water at for 6 or 30 hr on physicochemical properties of rice flour and molecular structure of starch were examined. pH of the steep water was decreased upon steeping. The lightness of the flour was gradually increased, while redness and yellowness were decreased as steeping time increased. The protein content was linearly decreased during steeping period. The fat content was sharply decreased from 18hr of steeping. The ash content rapidly decreased up to 12hr of steeping. The water-binding capacity was increased up to 12hr of steeping and decreased thereafter. The swelling power at was consistently increased during steeping period. The amylograph peak viscosity showed a linear relationship with the steeping time. The molecular structure of starch was not affected by steeping.