Abstract
The aim of this work was to demonstrate the production of polyol from microbial oil using wood-based hemicellulose stream through a greener enzymatic process. Yeast biomass concentration of 16.54 ± 0.65 g/L and lipid concentration of 6.97 ± 0.58 g/L were obtained by batch fermentation of hemicellulose prehydrolysate of poplar wood using an oleaginous yeast Cryptococcus curvatus. The produced microbial oil was successfully converted to epoxidized oil catalyzed by lipase with 84.55 ± 1.80% conversion. The epoxidation followed by ring opening reaction to produce polyol with hydroxyl value of 299.53 ± 1.24 mg KOH/g. This showed the possible use of the hemicellulose stream of lignocellulosic biomass to microbial oil and its subsequent conversion to polyol, a precursor to polyurethane and a number of value-added products. This bio-based polyol could be used to substitute the conventional polyols.
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