Repeated batch culture of Rhizopus arrhizus RA 128 using broken rice for L (+)-lactic acid production = Repeated batch culture of Rhizopus arrhizus RA 128 using broken rice for L (+)-lactic acid production

다국어 초록 (Multilingual Abstract)

The objective of this research was to study L (+)-lactic acid production by repeated batch culture of Rhizopus arrhizus RA 128 using broken rice as sole carbon source. The L (+)-lactic acid production increased with the increase of broken rice concentration by 60g/L. L (+)-lactic acid production was increased from 10.9 to 25.3g/L when pH was increased from 4.0 to 6.0. However, over 7.0 of pH, it was decreased. The L (+)-lactic acid productivity and cell concentration increased with the increase in temperature from 29 to 35 ℃. The maximum L (+)-lactic acid production and cell concentration was found with the 1.5% of CaCO3. Repeated batch culture was successfully performed for 4cycles for 12 days. All cycles showed that 234.5g/L of broken rice was consumed. 75g/L of total L (+)-lactic acid was obtained after 288hr. These results show that broken rice can be useful for the effective production of L (+)-lactic acid in the repeated batch culture of R. arrhizus RA 128.