| Abstract: | Single-stage continuous fermentations to produce xanthan gum have been run at dilution rates (D) from 0.023 to 0.196 hr?1. Xanthan production rate (XPR) was a function of D. XPR increased from 0.34 g/hr/kg at D = 0.023 hr?1 to the maximum 0.84 g/hr/kg at D = ca. 0.15 hr?1. At D > 0.15 hr?1 XPR decreased and at the highest D studied (0.196 hr?1) was 0.69 g/hr/kg. Yield of xanthan from glucose consumed was 81–89%. Steady states ended between 6.5 and 8.7 turnovers when a variant strain occurred. |
