Under whey/glucose batch co-fermentation, substrate versatility
of P. taetrolens showed that glucose was preferentially used
rather than lactose as the oxidation substrate, leading to a
low-yield co-production system in terms of lactobionic acid production
(0–6%) (Fig. 1B). Increasing the glucose co-substrate concentration
also increased the specific gluconic acid productivity
from 0.06 to 0.23 g/g h, suggesting that glucose became increasingly
a more favourable bioconversion substrate than lactose when
it was co-supplied at concentrations higher than 10 g/L (Fig. 1B).
When the concentration was in the range of 5–10 g/L, glucose
was totally consumed with a simultaneous production of lactobionic
acid at low volumetric rates (