Journal
MATERIALS
Volume 12, Issue 16, Pages -Publisher
MDPI
DOI: 10.3390/ma12162570
Keywords
structural properties; bamboo; hydrolysis abilities; pretreatment
Categories
Funding
- National Natural Science Foundation of China [31771724]
- Yang Ling science and technology plan project [2017NY-04]
- Special Fund for Basic Business of Chinese Academy of Forestry [CAFYBB2017ZX003-13]
- LSU School of Renewable Natural Resources
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In the present study, three pretreatments of sodium hydroxide (NaOH), sulfuric acid (H2SO4), and glycerin were employed with bamboo fibers at two different temperatures of 117 degrees C and 135 degrees C, respectively. The chemical composition and structural characterization of the pretreated bamboo fibers were comparatively studied using spectroscopic and wet chemistry methods. Furthermore, the comparative hydrolysis behaviors of pretreated bamboo were studied due to the synergistic interaction between cellulases and xylanase. The NaOH treatment increased the holocellulose contents to 87.4%, and the mean diameter of the cellulose fibers decreased from 50 +/- 5 mu m (raw fiber bundles) to 5 +/- 2 mu m. The lignin content and the degree of cellulose polymerization both decreased, while the crystallinity index of cellulose and thermostability increased. The hydrolysis yields of NaOH pretreated bamboo at 135 degrees C increased from 84.2% to 98.1% after a supplement of 0.5 cellulose to 1 mg protein/g dry xylan. The NaOH pretreatment achieved optimal enzymatic digestibility, particularly at higher temperatures as indicated by the results.
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