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In our previous work, the ability of laccase enzymes to improve the fermentation performance of thethermotolerant yeast Kluyveromyces marxianus CECT 10875 on steam-exploded wheat straw slurry wasdemonstrated. As a continuation of this study, the present research evaluates different aspects, includingpretreatment conditions, process configurations and substrate loadings, with the aim to proceed towardsthe use of K. marxianus and laccases for second generation ethanol production. For it, two wheat strawslurries resulting from different steam explosion pretreatment conditions (200 ◦C, 2.5 min and 220 ◦C,2.5 min) were employed at various substrate loadings [5–14% (w/v)] under two process configurations:SSF (simultaneous saccharification and fermentation) and PSSF (presaccharification and simultaneoussaccharification and fermentation). The better performance of K. marxianus was observed on the slurryproduced at softer conditions. Its lower inhibitors content allowed to increase the total solids loadingup to 10% (w/v) in both process configurations, reaching higher ethanol concentrations (12 g/L). Moreover,laccase detoxification improved these results, particularly in SSF processes, increasing the substrateloading up to 12% (w/v) and, consequently, obtaining the highest ethanol concentration (16.7 g/L).
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