title: Comparative study on enzymatic digestibility of switchgrass varieties and harvests processed by leading pretreatment technologies.
abstract: Feedstock quality of switchgrass for biofuel production depends on many factors such as morphological types, geographic origins, maturity, environmental and cultivation parameters, and storage. We report variability in compositions and enzymatic digestion efficiencies for three cultivars of switchgrass (Alamo, Dacotah and Shawnee), grown and harvested at different locations and seasons. Saccharification yields of switchgrass processed by different pretreatment technologies (AFEX, dilute sulfuric acid, liquid hot water, lime, and soaking in aqueous ammonia) are compared in regards to switchgrass genotypes and harvest seasons. Despite its higher cellulose content per dry mass, Dacotah switchgrass harvested after wintering consistently gave a lower saccharification yield than the other two varieties harvested in the fall. The recalcitrance of upland cultivars and over-wintered switchgrass may require more severe pretreatment conditions. We discuss the key features of different pretreatment technologies and differences in switchgrass cultivars and harvest seasons on hydrolysis performance for the applied pretreatment methods.
authors: Laboratory of Renewable Resources Engineering, Potter Engineering Center, 500 Central Drive, Purdue University, West Lafayette, IN 47907-2022, USA.
authors: Youngmi
authors: Y
authors: Kim
authors: Nathan S
authors: NS
authors: Mosier
authors: Michael R
authors: MR
authors: Ladisch
authors: V Ramesh
authors: VR
authors: Pallapolu
authors: Y Y
authors: YY
authors: Lee
authors: Rebecca
authors: R
authors: Garlock
authors: Venkatesh
authors: V
authors: Balan
authors: Bruce E
authors: BE
authors: Dale
authors: Bryon S
authors: BS
authors: Donohoe
authors: Todd B
authors: TB
authors: Vinzant
authors: Richard T
authors: RT
authors: Elander
authors: Matthew
authors: M
authors: Falls
authors: Rocio
authors: R
authors: Sierra
authors: Mark T
authors: MT
authors: Holtzapple
authors: Jian
authors: J
authors: Shi
authors: Mirvat A
authors: MA
authors: Ebrik
authors: Tim
authors: T
authors: Redmond
authors: Bin
authors: B
authors: Yang
authors: Charles E
authors: CE
authors: Wyman
authors: Ryan E
authors: RE
authors: Warner
mesh_terms: D000383:Agriculture; D001709:Biotechnology / Q000379:methods*; D060146:Ecotype; D004798:Enzymes / Q000378:metabolism*; D006868:Hydrolysis; D008897:Panicum / Q000378:metabolism*; D012621:Seasons
chemical_list: D004798:Enzymes