Figure 4

Production performance of the advanced ectoine-producer strain C. glutamicum ECT-2 during fed-batch fermentation. Cultivation profile of strain ECT-2 (A), and ectoine yield achieved in the different cultivation phases (B) are shown. The oxygen saturation in the fermenter was kept constant at 30% by variation of the stirrer velocity and the aeration rate. Automated feeding was initiated by a pO₂-based signal [53]. Glucose concentration was thereby kept below 5 g L^-1. The data shown represent mean values from two independent fermentation experiments.