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Enhanced Enzymatic Hydrolysis of Pennisetum alopecuroides by Dilute Acid, Alkaline and Ferric Chloride Pretreatments

1
College of Life Sciences and Bioengineering, School of Science, Beijing Jiaotong University, Beijing 100044, China
2
Key Laboratory of Cleaner Production and Integrated Resource Utilization of China National Light Industry, Beijing Technology and Business University, Beijing 100048, China
3
Faculty of Chemical and Food Technology, Ho Chi Minh City University of Technology and Education, No. 1 Vo Van Ngan Street, Linh Chieu Ward, Thu Duc District, Ho Chi Minh City 71307, Viet Nam
*
Authors to whom correspondence should be addressed.
These authors contributed equally.
Academic Editor: Ivet Ferrer
Molecules 2019, 24(9), 1715; https://doi.org/10.3390/molecules24091715
Received: 8 April 2019 / Revised: 27 April 2019 / Accepted: 30 April 2019 / Published: 2 May 2019
(This article belongs to the Special Issue Efficient Technology for the Pretreatment of Biomass II)
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Abstract

In this study, effects of different pretreatment methods on the enzymatic digestibility of Pennisetum alopecuroides, a ubiquitous wild grass in China, were investigated to evaluate its potential as a feedstock for biofuel production. The stalk samples were separately pretreated with H2SO4, NaOH and FeCl3 solutions of different concentrations at 120 °C for 30 min, after which enzymatic hydrolysis was conducted to measure the digestibility of pretreated samples. Results demonstrated that different pretreatments were effective at removing hemicellulose, among which ferric chloride pretreatment (FCP) gave the highest soluble sugar recovery (200.2 mg/g raw stalk) from the pretreatment stage. In comparison with FCP and dilute acid pretreatment (DAP), dilute alkaline pretreatment (DALP) induced much higher delignification and stronger morphological changes of the biomass, making it more accessible to hydrolysis enzymes. As a result, DALP using 1.2% NaOH showed the highest total soluble sugar yield through the whole process from pretreatment to enzymatic hydrolysis (508.5 mg/g raw stalk). The present work indicates that DALP and FCP have the potential to enhance the effective bioconversion of lignocellulosic biomass like P. alopecuroides, hence making this material a valuable and promising energy plant. View Full-Text
Keywords: Pennisetum alopecuroides; dilute alkaline pretreatment; ferric chloride pretreatment; enzymatic hydrolysis Pennisetum alopecuroides; dilute alkaline pretreatment; ferric chloride pretreatment; enzymatic hydrolysis
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Tang, S.; Xu, C.; Vu, L.T.K.; Liu, S.; Ye, P.; Li, L.; Wu, Y.; Chen, M.; Xiao, Y.; Wu, Y.; Wang, Y.; Yan, Q.; Cheng, X. Enhanced Enzymatic Hydrolysis of Pennisetum alopecuroides by Dilute Acid, Alkaline and Ferric Chloride Pretreatments. Molecules 2019, 24, 1715.

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