Sugarcane bagasse pretreated by different technologies used as support and carbon source in solid-state fermentation by Aureobasidium pullulans LB83 to produce bioemulsifier

Bioemulsifier production by Aureobasidium pullulans LB83 from pretreated sugarcane bagasse was evaluated in solid-state fermentation. Alkaline (0.2 mol.L NaOH; 12 min) and hydrodynamic cavitation (0.5 mol.L NaOH, 25 min) pretreatments showed a maximum lignin removal of 55.1 % and 44.7 %, respectively. Pretreatment biomass effectivity was assessed by X-ray diffraction, FT-MIR, FTIR-NIR, and RAMAN techniques. Maximum kerosene emulsification indexes of 65.8 % and 41.3 % were obtained in solid-state fermentation, respectively, for alkaline and hydrodynamic cavitation pretreated sugarcane bagasse. Synthesis of cellulases was observed in fermentation, showing maximum values of endoglucanase and exoglucanase, respectively, of 2.25 U.g and 1.39 U.g, for alkaline pretreated sugarcane bagasse, and 2.43 U.g and 1.45 U.g, for hydrodynamic cavitation-pretreated sugarcane bagasse. The biomolecule was characterized as a mixture of mannitol and arabitol-type liamocin. Microorganism was able to produce bioemulsifier using sugarcane bagasse as support and carbon source in solid-state fermentation, thus showing the potential of this system to obtain value-added products from this biomass.