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Reactivity of glucan and xylan in sorghum feedstocks: Comparing wild versus reduced lignin content lines and dilute versus deacetylation followed by diluted acid pretreatment


  • Godin, B. , Nagle, N. , Sattler, S. , Agneessens, R. , Delcarte, J. & Wolfrum, E. (2016). Reactivity of glucan and xylan in sorghum feedstocks: Comparing wild versus reduced lignin content lines and dilute versus deacetylation followed by diluted acid pretreatment. Proceedings in: 12th International Conference on Renewable Resources and Biorefineries, 30 May-1 June 2016, Ghent, Belgium,
Type Conference Proceedings
Year of conference 2016
Title Reactivity of glucan and xylan in sorghum feedstocks: Comparing wild versus reduced lignin content lines and dilute versus deacetylation followed by diluted acid pretreatment
Conference name 12th International Conference on Renewable Resources and Biorefineries, 30 May-1 June 2016, Ghent, Belgium
Label U13-Godin-2016
Abstract For biofuel production processes to be economically efficient, it is essential to maximize the production of monomeric carbohydrates from glucan (cellulose) and xylan (hemicelluloses) of feedstock. This can be achieved by identifying less recalcitrant feedstocks by screening or by genetic modifications such as the brown midrib (bmr) genes to get feedstocks with reduced lignin content. This can also be accomplished by using a pretreatment enhancing the reactivity such as deacetylation. It is a dilute NaOH pretreatment enabling to remove the acetyl groups of xylan. A laboratory-scale screening tool (ASE350) working at relevant biofuel process conditions has been used to compare the combined reactivity of glucan and xylan of near-isogenic bmr sorghum (Sorghum bicolor L. Moench) mutants to their wild type. It has also been used to evaluate the effect on the combined reactivity of glucan and xylan of these feedstocks made by the deacetylation before 1.0% sulfuric acid pretreatment combined by different temperatures of the dilute acid pretreatment. These bmr sorghums had a reduced lignin content compared to wild type. Considering the solubilized carbohydrates during deacetylation as a loss or not had an important impact on the reactivity because the analyzed sorghums had high non-structural carbohydrates content. Deacetylation before dilute acid pretreatment, bmr mutants compared to wild type, and higher temperature of dilute acid pretreatment significantly increased the reactivity. These differences decreased with an increasing temperature of dilute acid pretreatment or with deacetylation. Sorghum bmr mutants with reduced lignin content and/or deacetylation enabled to improve more the feedstock reactivity at lower severity than at higher severity of the dilute acid pretreatment. How non-structural carbohydrates are accounted for the calculation of reactivity in feedstocks with high non-structural carbohydrates content has a significant impact on the final result. It is not recommended to deacetylate a feedstock with high non-structural carbohydrates content if they are not recovered.
Fichier Reactivity of glucan and xylan in sorghum feedstocks: Comparing wild versus reduced lignin content lines and dilute versus deacetylation followed by diluted acid pretreatment
Authors Godin, B. , Nagle, N. , Sattler, S. , Agneessens, R. , Delcarte, J. & Wolfrum, E.