Lactobacillus plantarum was selected to ferment raw starchy materials of 'rice
bran ,wheat bran and potatoes peel" to produce lactic acid and calcium lactate in
semi-solid state fermentation. The noncooked starchy substrates were suspended in diluted solution of
sulfuric acid over night not only for the sterilization of the substrate,but also to help
the evolution of carbon dioxid upon addition of calcium carbonate( 0.5%) .,followed by
inoculation of the bacteria( 1 Ox1 0⁹ CFU/1 Oml). The selected organism produced lactic acid ranged from 0.49 to 0.75 gIL and
the yield of lactate ranged from 6 2 to 78 g IL of substrate.Maximum starch conversion           to lactic acid was obtained after 120 h.at pH 6.5.                                                                  . The addition of small amount of glucoamylase to the fermentation mixture .
resulted in a significant shortening of the fermentation process by Lactobacillus
plantarum cultivated at 37 C,without any other additives.