The fermentability of concentrated softwood-derived hemicellulose fractions with and without supplemental cellulose hydrolysates

摘要: Abstract The hemicellulose-rich component recovered following the steam explosion of softwood residues typically contain very dilute sugar concentrations, which can impact overall economics bioconversion process. In an attempt to address this concern, water-soluble fractions derived from exploded Douglas-fir whitewood and whitewood/bark chips were subjected a concentration step (rotary-evaporation or freeze-drying) prior fermentation. fermentability resultant streams was largely dependent on accumulation inhibitory material, with poor fermentation concentrates at as low twofold increase in concentration. bark-containing slightly easier ferment, but above 2.5-fold concentration, significant “lag” observed. Concurrently, supplemented glucose-rich cellulose hydrolysate obtained after enzymatic hydrolysis water-insoluble, component. Supplementation original fraction readily-fermentable resulted significantly improved Using approach, it possible hexose by more than 50%, while still achieving high yield ethanol production.