Journal
BIORESOURCES
Volume 10, Issue 2, Pages 2266-2280Publisher
NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI
DOI: 10.15376/biores.10.2.2266-2280
Keywords
Soybean straw; Morphology; Chemical composition; Elements distribution; Dissolution-regeneration
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Funding
- National Natural Science Foundation of China [31200444]
- Doctorate Fellowship Foundation of Nanjing Forestry University
- Specialized Research Fund for the Doctoral Program of Higher Education of China [201232041100012]
- PAPD of Jiangsu Higher Education Institutions
- Jiangsu Provincial Graduate Student Innovation Research Project [CXLX11_0529]
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To improve basic knowledge of the properties of soybean straw, its fiber properties, anatomical structure, and components were investigated in detail. Soybean straw contains less ash and silica than some non-woody biomass. Its stem and root have more lignin and holocellulose, but less nitrogen and protein contents than the pod. Additionally, it has much shorter and wider fibers, and the length-width ratio is also lower than other crop straws. Morphologically, there are three main tissues-the ground tissue, the vascular tissue, and the dermal tissue systems in the stem, and two different morphology portions - the intimal layer and the leathery layer - in the longitudinal-section of the pod. A variety of inorganic and metal elements are distributed across the whole stem or pod in different amounts. Lastly, the planetary ball-milled stem and pod are completely dissolved in 8% lithium chloride/dimethyl sulfoxide (LiCl/DMSO) solution. After regeneration, the lignin has the highest retention, followed by silica and sugars, but most of the ash can be removed in this process.
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