The polyphenols are water soluble due to their chemical characteristics.
Therefore, a portion of these compounds may be solubilized
in the parboiling water. Concentrations of phenolic compounds between
10.77 mg GAE and 39.24 mg GAE (from the parboiling of
100 g of rice grains with the hull) were observed in the parboiling
water, demonstrating that a small part of the reduction in the polyphenol
concentration in the parboiled grains is due to the loss of polyphenols
in the water.