In Fig. 2b, the yeast started exponential and stationary phase (12-30 hrs) earlier than bacteria did (18-60 hrs).This result is vital to explain the effects of different ratios in GlcUA production.When the initial amount of yeast was equal or higher than amount of AAB (7Y3A; 6Y4A; 5Y5A), the yeast could have the advantage over the bacteria, hence, the GlcUA concentrations were average (42e45 mg L1). In other cases, when initial AAB population was higher than yeast or even there was no yeast in the last sample