The dry matter content of RS and RSPF gruels was reduced (P < 0.05) from 20 g and 21 g % to 19.0 ± 0.2 g and 20.0 ± 0.2 g %, respectively in the fermented products. No significant differences were observed between gruels fermented by different bacterial cultures (P > 0.05). The reduction of dry matter in fermented products can be ascribed to partial proteolysis of the matrix by the bacteria (Hou, Yu, & Chou, 2000).