One-Step or Two-Step Acid/Alkaline Pretreatments to Improve Enzymatic Hydrolysis and Sugar Recovery from Arundo Donax L

Shangyuan Tang, Yushen Cao, Chunming Xu, Yue Wu, Lingci Li, Peng Ye, Ying Luo, Yifan Gao, Yonghong Liao, Qiong Yan and Xiyu Cheng
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Shangyuan Tang: College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, China
Yushen Cao: College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, China
Chunming Xu: Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
Yue Wu: College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, China
Lingci Li: College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, China
Peng Ye: College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, China
Ying Luo: College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, China
Yifan Gao: College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, China
Yonghong Liao: Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
Qiong Yan: College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, China
Xiyu Cheng: College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, China

Energies, 2020, vol. 13, issue 4, 1-12

Abstract: Energy crops are not easily converted by microorganisms because of their recalcitrance. This necessitates a pretreatment to improve their biodigestibility. The effects of different pretreatments, as well as their combination on the enzymatic digestibility of Arundo donax L. were systematically investigated to evaluate its potential for bioconversion. Dilute alkaline pretreatment (ALP) using 1.2% NaOH at 120 °C for 30 min resulted in the highest reducing sugar yield in the enzymatic hydrolysis process because of its strong delignification and morphological modification, while ferric chloride pretreatment (FP) was effective in removing hemicellulose and recovering soluble sugars in the pretreatment stage. Furthermore, an efficient two-step ferric chloride-alkaline pretreatment (FALP) was successfully developed. In the first FP step, easily degradable cellulosic components, especially hemicellulose, were dissolved and then effectively recovered as soluble sugars. Subsequently, the FP sample was further treated in the second ALP step to remove lignin to enhance the enzymatic hydrolysis of the hardly degradable cellulose. As a result, the integrated two-step process obtained the highest total sugar yield of 420.4 mg/g raw stalk in the whole pretreatment and enzymatic hydrolysis process; hence, the process is a valuable candidate for biofuel production.

Keywords: Arundo donax L.; ferric chloride pretreatment; dilute alkaline pretreatment; two-step process; enzymatic hydrolysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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