Abstract
This study aims to investigate the effect of nitrogen source on curdlan production by Alcaligenes faecalis ATCC 31749. Curdlan production fell when excess nitrogen source was present, while biomass accumulation increased as the level of nitrogen source raised. Curdlan production and biomass accumulation were greater with urea compared with those with other nitrogen sources. The highest production of curdlan and biomass accumulation by A. faecalis ATCC 31749 was 28.16gL−1 and 9.58gL−1, respectively, with urea, whereas those with NH4Cl were 15.17gL−1 and 6.25gL−1, respectively. The optimum fermentation time for curdlan production was also affected by the nitrogen source in the medium.
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