title: Sugar yields from sunflower stalks treated by hydrothermolysis and subsequent enzymatic hydrolysis.
abstract: To produce fermentable sugar with fewer microbial inhibitors via few processes, batch-type hydrothermal treatments of sunflower stalks were performed, followed by enzymatic hydrolysis of pretreatment slurries with Cellic CTec2 and Cellic HTec2 (9:1, v/v, 0.1 ml/g dry biomass, 8.1FPU). The yields of hemicellulosic sugars were maximized at the pretreatment condition of 180°C for 30 min, while the furfural and 5-hydroxymethyl-2-furaldehyde (HMF) concentrations remained low. The glucose yield, however, was only 67.0% of the theoretical glucose yield (TGY). Either the treatment of raw biomass prior to pretreatment or the post-treatment of pretreated residue prior to enzymatic hydrolysis increased the glucose yield as follows: washing the pretreated solid with solvents (90% TGY)>partial removal of liquid fraction from the pretreatment slurry (PS, 83%)>removal of hot-water extractives from the biomass prior to pretreatment (77%)>prewetting of the biomass (70%).
authors.affiliation: Research Center for Biobased Chemistry, Korea Research Institute of Chemical Technology, Daejeon 305-600, Republic of Korea.
authors.forename: Chan-Duck
authors.initials: CD
authors.lastname: Jung
authors.forename: Ju-Hyun
authors.initials: JH
authors.lastname: Yu
authors.forename: In-Yong
authors.initials: IY
authors.lastname: Eom
authors.forename: Kyung-Sik
authors.initials: KS
authors.lastname: Hong
mesh_terms: D018533:Biomass; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D002241:Carbohydrates / Q000096:biosynthesis*; D002480:Cellulase / Q000378:metabolism*; D006368:Helianthus / Q000378:metabolism*; D006868:Hydrolysis / Q000187:drug effects; D013696:Temperature; D014866:Waste Products / Q000032:analysis*; D014867:Water / Q000494:pharmacology*
chemical_list: D002241:Carbohydrates; D014866:Waste Products; D014867:Water; D002480:Cellulase