Abstract:
This research was to study the production of Bacillus sp. cell biomass at high
concentrations with a defined medium using glucose oligomer (dextrin) from cassava starch
liquefaction as the carbon source at high concentrations with the aerobic batch cultivation
technique, which is simple and inexpensive. This study in shake flask culture found that the Batch
Production Medium (BPM) provided an optimal result with a cell concentration of 6.77 g/l. When
compared to other culture media, using dextrin as the carbon source at a high concentration
showed an optimal cell concentration of 12.93 g/l. In addition, cell cultivation in a 5-liter, the
concentration of carbon source dextrin was able to increase up to 100 g/l without growth
inhibition, and enhancement of a cell concentration to 31.98 g/l. Further, the scaled-up studies of
cell cultivation in 30 and 300-liter fermenters were carried out in order to study the production
potential at pilot scales. They clearly showed very good results of cell concentrations of 43.49 and
47.03 g/l with the productivities of 3.11 and 3.92 g/l/h, respectively. The results of these studies
essentially demonstrated higher efficient productions when compared to those of other research
works.