초록
In this study, the production of succinic acid from cassava starch and raw cassava instead of glucose by Escherichia coli NZN111 was investigated. During the two-stage fermentation, simultaneous saccharification and fermentation (SSF) was applied in the anaerobic stage. The results showed that both the productivity and specific productivity in the process conducted at 40<SUP>o</SUP>C were higher than those in the cultivation conducted at 37<SUP>o</SUP>C. The yield of succinic acid based on the amount of added starch reached the highest level 0.86g/g and cassava starch was almost totally hydrolyzed in the SSF process. With the improved cell density, 127.13g/L of succinic acid was obtained. When the liquefied crude cassava powder was used directly in SSF, 106.17g/L of succinic acid was formed. The result showed that crude cassava powder could be another cheap raw material for succinic acid formation.