The medium had been concentrated, but not treated for detoxification, yet the microorganism was able to grow at high concentrations of inhibitors (4.5 g L−1acetic acid;0.38 g L−1formic acid; 3.3 g L−1phenols). On the other hand, in CABH-1 microorganism growth was only 11.88 g L−1. This was theonly medium where K. marxianus CCA510 consumed all xylose during fermentation (at 24 h, it had already consumed approximately 90% of the sugar). Additionally, in the other culture media (CABH-2, CABH-3 and CABH-4) the microorganism was able to assimilate over