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01-04-2014 | Original Paper

Influence of ionic-liquid incubation temperature on changes in cellulose structure, biomass composition, and enzymatic digestibility

Authors: Christopher J. Barr, B. Leif Hanson, Kevin Click, Grace Perrotta, Constance A. Schall

Published in: Cellulose | Issue 2/2014

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Abstract

Varying ionic liquid, 1-ethyl 3-methyl imidazolium acetate, pretreatment incubation temperature on lignocellulosic biomass substrates, corn stover, switchgrass and poplar, can have dramatic effects on the enzymatic digestibility of the resultant regenerated biomass. In order to delineate the chemical and physical changes resulting from the pretreatment process and correlate changes with enzymatic digestibility, X-ray powder and fiber diffraction, ¹³C cross polarization/magic angle spinning nuclear magnetic resonance spectroscopy, and compositional analysis was completed on poplar, corn stover and switchgrass samples. Optimal pretreatment incubation temperatures were most closely associated with the retention of amorphous substrates upon drying of regenerated biomass. Maximal glucan to glucose conversion for 24 h enzyme hydrolysis was observed for corn stover, switchgrass and poplar at ionic liquid incubation temperatures of 100, 110 and 120 °C, respectively. We hypothesize that effective pretreatment temperatures must attain lignin redistribution and retention of xylan for optimal enzyme digestibility.

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Title: Influence of ionic-liquid incubation temperature on changes in cellulose structure, biomass composition, and enzymatic digestibility
Authors: Christopher J. Barr
B. Leif Hanson
Kevin Click
Grace Perrotta
Constance A. Schall
Publication date: 01-04-2014
Publisher: Springer Netherlands
Published in: Cellulose / Issue 2/2014
Print ISSN: 0969-0239
Electronic ISSN: 1572-882X
DOI: https://doi.org/10.1007/s10570-013-0052-y

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