The lactic acid production from SSF of cassava starch by L. plantarum MSUL 903 under the optimum conditions was comparable to the study of [11] and [12]. Under the optimum conditions and a non-sterile condition, the L. plantarum MSUL 903 still showed a high performance in lactic acid production (Fig. 3). Lactic acid concentration as high as 39.7 g/L
was obtained at 96 h. Cassava starch was almost consumed within 72 h.