kinetic profiles of glucose consumption and ethanol accumulationinto the culture medium being almost equivalent comparedwith the sterile media (Tao et al., 2005). Finally Weuster-Botzet al., 1993 have developed a continuous fluidized bed reactoroperation system for ethanol production by Z. mobilis strain ATCC31821 using hydrolyzed starch without sterilization. The unsterile,99% hydrolyzed, starch conversion resulted in 50 g L−1ethanolproduction.