Stepwise allomorphic transformations by alkaline and ethylenediamine treatments on bamboo crystalline cellulose for enhanced enzymatic digestibility
Journal Article
·
· Industrial Crops and Products
- Nanjing Forestry Univ. (China); Louisiana State University
- Nanjing Forestry Univ. (China)
- Louisiana State Univ., Baton Rouge, LA (United States)
- USDA, New Orleans, LA (United States)
Efficient modification and decrystallization of cellulose Iβ in lignocellulosic biomass are potential ways to overcome biomass recalcitrance and facilitates enzymatic degradation. Herein, we have treated moso bamboo and microcrystalline cellulose separately by either alkali or ethylenediamine (EDA) treatments, as well as using both in succession. The pretreatments successfully transformed the initial cellulose Iβ allomorph into cellulose II, IIII, and cellulose IIIII. Crystal structures and crystallinities were determined by Rietveld X-ray diffraction and CP/MAS 13C NMR. Comparatively, the samples that were sequentially treated by EDA and NaOH had low crystallinity (~50%), larger d-spacings of ~4.4 Å for the hydrophobic (110) planes, and less condensed microfibrillar aggregation. The factors simultaneously contributed to as high enzymatic hydrolysis yield as 89.5% and 91.7% respectively, followed by the yields of mercerized cellulose II and cellulose IIIII allomorph. Here, the stepwise allomorphic transformations may provide new strategies on improving efficiency of saccharification process and biomass utilization.
- Research Organization:
- Louisiana State Univ., Baton Rouge, LA (United States)
- Sponsoring Organization:
- National Natural Science Foundation for Youth; Natural Science Foundation of Jiangsu Province for Youth; USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0021210
- OSTI ID:
- 1865809
- Journal Information:
- Industrial Crops and Products, Journal Name: Industrial Crops and Products Vol. 177; ISSN 0926-6690
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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