Shake-flask cultivation in semi-defined media
Experiments were carried out in 250-mL unbaffled conical
flasks with a working volume of 50 mL, at a rotation
rate of 200 rpm at 30°C. Experiments were carried out
with 70 g/L total sugars with different glucose:D-xylose
mass ratios: 2:1, 1:1, 1:2, 1:0 (glucose only) and 0:1 (Dxylose
only). All experiments were conducted for 120
hours. To test the possibility that supplementation of
one sugar might change the outcome of the culture
initiated with the other sugar as the sole carbon source the experiment was started using a culture containing
35 g/L glucose or D-xylose as the sole carbon source,
with an equal amount (35 g/L) of the other carbon
source being added after 24-h cultivation.