Sugar yields from dilute sulfuric acid and sulfur dioxide pretreatments and subsequent enzymatic hydrolysis of switchgrass

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• 作者：Jian  ; Shi^a ; Mirvat A.  ; Ebrik^a ; Charles E.  ; Wyman^a ;   ; ^b ;   ; ^{charles.wyman@ucr.edu}
• 关键词：Pretreatment ; Dilute sulfuric acid ; Sulfur dioxide ; Biofuels ; Switchgrass
• 刊名：Bioresource Technology
• 出版年：2011
• 出版时间：October 2011
• 年：2011
• 卷：102
• 期：19
• 页码：8930-8938
• 全文大小：577 K

文摘

Dacotah switchgrass was pretreated with sulfuric acid concentrations of 0.5, 1.0, and 2.0 wt. % at 140, 160, and 180 ¡ãC and with 1 and 3 wt. % sulfur dioxide at 180 ¡ãC over a range of times. Sulfur dioxide loadings of 0 % , 1 % , 3 % , 5 % , and 10 % wt. % of dry biomass were also tested at 180 ¡ãC for 10 min. Sugar yields were tracked for pretreatment and subsequent enzymatic hydrolysis to identify conditions for the highest total sugar yields. Pretreatment with 1 wt. % dilute sulfuric acid at 140 ¡ãC for 40 min followed by enzymatic hydrolysis with 48.6 mg enzyme/g initial glucan in raw biomass resulted in ?6 % of theoretical yield for glucose and xylose combined. For sulfur dioxide pretreatment, the highest total sugar yield of about 87 % occurred at 5 % SO₂ for 10 min and 180 ¡ãC. However, xylose yields were higher at shorter times and glucose yields at longer times.