title: Pretreatment of Siam weed stem by several chemical methods for increasing the enzymatic digestibility.
abstract: Siam weed [Chromolaena odorata (L.) King & Robinson], an invasive exotic weed in China, was proposed as a feedstock for bioethanol production. This would be a promising way of using for an invasive weed that needs management and control. It was found that the glucan content of the weed stem was similar to that of sugarcane bagasse, but higher than those of corn stover and wheat straw. Several chemical pretreatment methods were applied to the weed stem to increase its enzymatic digestibility. Mild sulfuric acid (<120 degrees C) or alkali pretreatment did not markedly increase the enzymatic digestibility. However, peracetic acid (PAA) pretreatment dramatically enhanced the enzymatic hydrolysis of the weed stem. Compared to some other common agricultural residues, the weed stem was more difficult to pretreat and digest by cellulase. Fourier transform infrared (FTIR) spectra analysis indicated that the cellulose-related bands became more intensive after pretreatment, especially for PAA-pretreated samples. According to X-ray diffraction spectra, the biomass solids had higher crystallinity indices after pretreatment, although these indices were similar for all of the pretreated samples.
authors.affiliation: Institute of Applied Chemistry, Department of Chemical Engineering, Tsinghua University, Beijing, China. zhaoxb04@mails.tsinghua.edu.cn
authors.forename: Xuebing
authors.initials: X
authors.lastname: Zhao
authors.forename: Lihua
authors.initials: L
authors.lastname: Zhang
authors.forename: Dehua
authors.initials: D
authors.lastname: Liu
mesh_terms: D001674:Bioelectric Energy Sources; D018533:Biomass; D036604:Chromolaena / Q000737:chemistry*; D005947:Glucose / Q000378:metabolism; D008031:Lignin / Q000737:chemistry / Q000378:metabolism*; D010463:Peracetic Acid / Q000737:chemistry; D012972:Sodium Hydroxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013464:Sulfuric Acids / Q000737:chemistry; D013696:Temperature; D014961:X-Ray Diffraction; D014994:Xylose / Q000378:metabolism
chemical_list: D013464:Sulfuric Acids; C036909:lignocellulose; D012972:Sodium Hydroxide; D008031:Lignin; D014994:Xylose; D010463:Peracetic Acid; D005947:Glucose; C033158:sulfuric acid