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• W2112643424 endingPage "90" @default.
• W2112643424 startingPage "85" @default.
• W2112643424 abstract "Background: Switchgrass (Panicum virgatum L.) is being considered as a potential feedstock for bioethanol production and extensive research is ongoing to establish the optimum pretreatment conditions for switchgrass. Cellulose comprises the most abundant biopolymer in the biosphere and its crystalline/ultrastructure is considered to be related to biomass recalcitrance. This study investigates the effects of dilute acid pretreatment on ultrastructural features of switchgrass cellulose. Results: In this study, switchgrass was pretreated in a pilot-scale reactor at 190°C (0.05 g sulfuric acid per gram of dry switchgrass) with 25% total solid loading and a reactor residence of 1 min. Cellulose was isolated from the pretreated and untreated switchgrass. The impact of pretreatment on the ultrastructure of cellulose was determined by solid-state cross polarization/magic angle spinning 13C NMR spectroscopy. Switchgrass demonstrated a preferable degradation of amorphous cellulose regions during dilute acid pretreatment. The pretreated switchgrass cellulose showed an 18% increase in crystallinity index when compared with the untreated switchgrass. Line-fitting analysis of the C-4 region of 13C NMR spectra revealed that the relative proportion of crystalline and paracrystalline celluloses in switchgrass was observed to increase after dilute acid pretreatment, accompanied with a concurrent decrease of the relative abundance of fibril surface cellulose. Conclusion: After dilute acid pretreatment, most of the hemicellulose in switchgrass was removed. The amorphous cellulose regions in switchgrass were degraded preferably during dilute acid pretreatment and the cellulose crystallinity index of pretreated switchgrass increased. Pretreated switchgrass had an increase in relative proportion of crystalline and paracrystalline cellulose in comparison to the starting material." @default.
• W2112643424 created "2016-06-24" @default.
• W2112643424 creator A5025247379 @default.
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• W2112643424 creator A5091023991 @default.
• W2112643424 creator A5091807255 @default.
• W2112643424 date "2010-01-01" @default.
• W2112643424 modified "2023-10-14" @default.
• W2112643424 title "Solid-state NMR characterization of switchgrass cellulose after dilute acid pretreatment" @default.
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• W2112643424 doi "https://doi.org/10.4155/bfs.09.17" @default.
• W2112643424 hasPublicationYear "2010" @default.
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