Journal
BIORESOURCE TECHNOLOGY
Volume 203, Issue -, Pages 303-308Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2015.12.037
Keywords
Weed biomass; Lignocellulosic feedstocks; Pretreatment; Concentrated phosphoric acid; Enzymatic hydrolysis
Funding
- National Research Council of Thailand [R2554D020]
- Faculty of Science of Naresuan University
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Achyranthes aspera and Sida acuta, two types of weed biomass are abundant and waste in Thailand. We focus on them as novel feedstock for bio-ethanol production because they contain high-cellulose content (45.9% and 46.9%, respectively) and unutilized material. Phosphoric acid (70%, 75%, and 80%) was employed for the pretreatment to improve by enzymatic hydrolysis. The pretreatment process removed most of the xylan and a part of the lignin from the weeds, while most of the glucan remained. The cellulose conversion to glucose was greater for pretreated A. aspera (86.2 +/- 0.3%) than that of the pretreated S. acuta (82.2 +/- 1.1%). Thus, the removal of hemicellulose significantly affected the efficiency of the enzymatic hydrolysis. The scanning electron microscopy images showed the exposed fibrous cellulose on the cell wall surface, and this substantial change of the surface structure contributed to improving the enzyme accessibility. (C) 2015 Elsevier Ltd. All rights reserved.
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