Cellulose
Cellulose is the main chemical that forms the main structure of plants. It is the most abundant macromolecule and the most common organic compound on Earth. It is also a kind of fiber. Cellulose is a very complex carbohydrate, consisting of 3,000 or more glucose units. Cellulose was discovered by Anselme Payen in 1838. He isolated it from plant matter and determined its chemical formula.
Properties
Cellulose has no taste. It is odorless and hydrophilic,[1] meaning it attracts water. It is insoluble in water and most organic solvents. It is chiral and is biodegradable.[2]
Cellulose is made from a form of glucose and makes up most of the cell wall of plant cells. This is what keeps a plant in shape. Humans and other animals cannot digest cellulose but some animals such as termites and ruminants use bacteria to digest it.
It is a polysaccharide, which is repeating units of a monosaccharide joined together by a glycosidic bond by a condensation reaction. It is very tough because when you join beta glucose together, they are opposite ways up. The bonds are straight, forming straight chains. There are hydrogen bonds between the polymers.
These fibers are in bundles of about 40, called microfibrils. Microfibrils are embedded in a hydrated network of other polysaccharides. The cell wall is assembled in place. The parts are made inside the cell and then assembled by enzymes associated with the cell membrane.
Uses
It is mainly used to make paper. It is also used to make as cotton, linen, and rayon for clothes, nitrocellulose for explosives, and cellulose acetate for films.[3] Cellulose is used as insulation in transformers, cables, and other electrical equipment.[4] Microcrystalline cellulose and powdered cellulose are used as inactive fillers in drug tablets. Cellulose derivatives are used as emulsifiers, thickeners and stabilizers in processed foods.[5] Cellulose can be converted into cellophane. Cellulose is used to make water-soluble adhesives and binders such as methyl cellulose and carboxymethyl cellulose.
Celluose can also be used as a anti-caking agent in some foods like pre-shredded cheese.[6]
Cellulose Media
The arrangement of cellulose and other polysaccharides in a plant cell wall
Cellulose under a microscope.
A triple strand of cellulose showing the hydrogen bonds (cyan lines) between glucose strands
Cotton fibres represent the purest natural form of cellulose, containing more than 90% of this polysaccharide.
A strand of cellulose (conformation Iα), showing the hydrogen bonds (dashed) within and between cellulose molecules.
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References
- ↑ Bishop, Charles A. (2007). Vacuum deposition onto webs, films, and foils. Norwich, NY: William Andrew Pub. ISBN 978-0-8155-1947-8. OCLC 183666049.
- ↑ Wyman, Charles E. (1994). "Ethanol from lignocellulosic biomass: Technology, economics, and opportunities". Bioresource Technology. 50 (1): 3–15. doi:10.1016/0960-8524(94)90214-3.
- ↑ "Cellulose - an overview | ScienceDirect Topics". www.sciencedirect.com. Retrieved 2020-05-20.
- ↑ Kohman, G. T. (1939). "Cellulose as an Insulating Material". Industrial & Engineering Chemistry. 31 (7): 807–817. doi:10.1021/ie50355a005. ISSN 0019-7866.
- ↑ Excipient toxicity and safety. Weiner, Myra L., 1944-, Kotkoskie, Lois A. New York: M. Dekker. 2000. ISBN 0-8247-8210-0. OCLC 42649682.
{{cite book}}: CS1 maint: others (link) - ↑ Chamlee, Virginia (2016-03-03). "The Real Problem With Wood Pulp in Cheese". Eater. Retrieved 2021-06-01.