Plant cell wall composition of cellulose fibers small interstitial polysaccharide gel to remove the pectin group than in substance, constitute the primary wall of the main ingredients. Including glucose, xylose, mannose, arabinose and galactose, etc., a single sugar polymer covalent bond between the respectively, hydrogen bond, ether bond and ester bond connecting them with the extended protein, other structural proteins, wall enzymes, fiber pectin and other form factors and a certain hardness and elasticity of the cell wall, thus showing a stable chemical structure. The original is from the total cellulose with 17.5% NaOH as well as 24% KOH polysaccharide extracted from the general term, but no corresponding specific chemical structure. Alkaline extract with acetic acid and precipitation of the hemicellulose part A, part of the supernatant was precipitated with ethanol, hemicellulose B. As an important addition to polysaccharide xylan, glucan, arabinoxylan, grape mannan, arabinogalactan and other neutral polysaccharides outside.
Hemicellulose has hydrophilic properties, which will cause the cell wall-run inflation, can be given to fiber flexibility. In the sheet forming process in favor of fiber structure and bonding between the fibers. Therefore, the added impact of hemicellulose fiber surface adsorption, influence on paper strength. To retain or add the pulp hemicellulose help beating because hemicellulose is easier than cellulose hydration profit expansion, adsorption to the cellulose and hemicellulose, and increase the profit expansion and elastic fibers, the fiber grinding instead of being cut off, so to reduce energy consumption beating to get the desired pulp strength.
Refers to the plant cell wall hemicellulose and cellulose in symbiosis, soluble in alkaline solution, after the case of acid hydrolysis than cellulose that part easy to plant polysaccharides. A plant often contain two or three types of base composition of the hemicellulose sugars, and its chemical structure varies. Tree stems, branches, roots and bark of the hemicellulose content and composition are also different. Therefore, hemicellulose is the name of a class of substances. Glycosylation of hemicellulose constitute the main D-xylose, D-mannose, D-glucose, D-galactose, L-arabinose, 4 – O-methyl-D-glucuronic acid and a small amount of L-rhamnose sugar, L-fucose and so on. Hemicellulose is divided into three categories, namely, poly wood sugars, mannose sugars and poly-poly grape grape nectar sugar galactose.
Application
Hemicellulose are being developed for industrial use, pulp and waste can be prepared yeast, the yeast can be pumping the 10% of the RNA, then a single phosphate derivative of inosine and guanosine single phosphate, used as flavoring agents, anti- cancer agents or anti-viral agent. Forest chemical method is to use the fiber raw material pre-hydrolysis of organic acids, the hydrolysis still pulp residue, with the quality of the pulp is not comparable to the pre-hydrolysis, and hydrolysis could separate from the pentose and hexose components, from wood After treatment, made of sugar xylitol can be used as sweeteners, plasticizers, surfactants; xylose acid can be used as adhesives; poly xylose sulfate can be used for anti-clotting agent. Hemicellulose sugars fermented alcohol is the use of biotechnology, plant fibers from renewable raw materials to take alcohol, has been the research focus of international concern in this project to corn on the cob core for raw materials, semi-dilute acid hydrolysis of the fiber into E sugar, and further fermented to ethanol. The overall level of China’s first international art. The success of this technology will pilot the development of Chinese alcohol industry play a positive role in tackling the human face of energy crisis, food shortage and environmental pollution problems are of great significance.
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