Co-production of bioethanol and xylitol from steam-exploded bamboo using the newly isolated yeast strain Sugiyamaella marilandica HYSM006

Abstract

This study investigated a novel yeast strain, Sugiyamaella marilandica HYSM006, for its potential in bioethanol and xylitol production from lignocellulosic biomass. HYSM006 demonstrated efficient glucose conversion to ethanol under both anaerobic and aerobic conditions in synthetic media, achieving up to 49.7 g L⁻¹ ethanol from 100 g L⁻¹ glucose. Aerobic cultivation in 100 g L⁻¹ xylose yielded 40.7 g L⁻¹ xylitol and 16.5 g L⁻¹ ethanol. The strain demonstrated very low ethanol consumption after glucose exhaustion and exhibited good osmotic stress tolerance up to a concentration of 230 g L⁻¹ glucose and 61.6 g L⁻¹ ethanol. After adaptation to lignocellulosic hydrolysates the strain was able to utilize bamboo hydrolysate at a solid loading of 20 % w w⁻¹, achieving 19.2 g L⁻¹ ethanol and 3.4 g L⁻¹ xylitol. The results underscore Sugiyamaella marilandica HYSM006's potential for biotechnical application, showcasing its ability to effectively utilize glucose and xylose. Despite its potential, further research is needed to enhance the strain's yield and ethanol tolerance for commercial-scale applications.