Science, Tech, Math › Science What Is Cellulose? Facts and Functions Share Flipboard Email Print Cotton fibers are the purest natural form of cellulose, consisting of over 90% of the polymer. Victoria Bee Photography / Getty Images Science Chemistry Biochemistry Basics Chemical Laws Molecules Periodic Table Projects & Experiments Scientific Method Physical Chemistry Medical Chemistry Chemistry In Everyday Life Famous Chemists Activities for Kids Abbreviations & Acronyms Biology Physics Geology Astronomy Weather & Climate By Anne Marie Helmenstine, Ph.D. Chemistry Expert Ph.D., Biomedical Sciences, University of Tennessee at Knoxville B.A., Physics and Mathematics, Hastings College Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. She has taught science courses at the high school, college, and graduate levels. our editorial process Facebook Facebook Twitter Twitter Anne Marie Helmenstine, Ph.D. Updated December 10, 2019 Cellulose [(C6H10O5)n] is an organic compound and the most abundant biopolymer on Earth. It is a complex carbohydrate or polysaccharide consisting of hundreds to thousands of glucose molecules, linked together to form a chain. While animals don't produce cellulose, it is made by plants, algae, and some bacteria and other microorganisms. Cellulose is the main structural molecule in the cell walls of plants and algae. History French chemist Anselme Payen discovered and isolated cellulose in 1838. Payen also determined the chemical formula. In 1870, the first thermoplastic polymer, celluloid, was produced by Hyatt Manufacturing Company using cellulose. From there, cellulose was used to produce rayon in the 1890s and cellophane in 1912. Hermann Staudinger determined the chemical structure of cellulose in 1920. In 1992, Kobayashi and Shoda synthesized cellulose without using any biological enzymes. Chemical Structure and Properties Cellulose forms by linking glucose subunits. NEUROtiker, Ben Mills / Public Domain Cellulose forms via β(1→4)-glycosidic bonds between D-glucose units. In contrast, starch and glycogen form by α(1→4)-glycosidic bonds between glucose molecules. The linkages in cellulose make it a straight chain polymer. The hydroxyl groups on the glucose molecules form hydrogen bonds with oxygen atoms, holding the chains in place and conferring high tensile strength to the fibers. In plant cell walls, multiple chains bond together to form microfibrils. Pure cellulose is odorless, flavorless, hydrophilic, insoluble in water, and biodegradable. It has melting point of 467 degrees Celsius and can be degraded into glucose by acid treatment at high temperature. Cellulose Functions Cellulose supports the cell wall of plants. ttsz / Getty Images Cellulose is a structural protein in plants and algae. Cellulose fibers are enmeshed in a polysaccharide matrix to support plant cell walls. Plant stems and wood are supported by cellulose fibers distributed in a lignin matrix, where the cellulose acts like reinforcing bars and the lignin acts like concrete. The purest natural form of cellulose is cotton, which consists of over 90% cellulose. In contrast, wood consists of 40-50% cellulose. Some types of bacteria secrete cellulose to produce biofilms. The biofilms provide an attachment surface for the microorganisms and allow them to organize into colonies. While animals cannot produce cellulose, it is important to their survival. Some insects use cellulose as a building material and food. Ruminants use symbiotic microorganisms to digest cellulose. Humans can't digest cellulose, but it is the main source of insoluble dietary fiber, which affects nutrient absorption and aids defecation. Important Derivatives Many important cellulose derivatives exist. Many of these polymers are biodegradable and are renewable resources. Cellulose-derived compounds tend to be non-toxic and non-allergenic. Cellulose derivatives include: CelluloidCellophaneRayonCellulose acetateCellulose triacetateNitrocelluloseMethylcelluloseCellulose sulfateEthuloseEthyl hydroxyethyl celluloseHydroxypropyl methyl celluloseCarboxymethyl cellulose (cellulose gum) Commercial Uses The principal commercial use for cellulose is paper manufacturing, where the kraft process is used to separate cellulose from lignin. Cellulose fibers are used in the textile industry. Cotton, linen, and other natural fibers may be used directly or processed to make rayon. Microcrystalline cellulose and powdered cellulose are used as drug fillers and as food thickeners, emulsifiers, and stabilizers. Scientists use cellulose in liquid filtration and thin layer chromatography. Cellulose is used as building material and electrical insulator. It is used in everyday household materials, like coffee filters, sponges, glues, eye drops, laxatives, and films. While cellulose from plants has always been an important fuel, cellulose from animal waste can also be processed to make butanol biofuel. Sources Dhingra, D; Michael, M; Rajput, H; Patil, R. T. (2011). "Dietary fibre in foods: A review." Journal of Food Science and Technology. 49 (3): 255–266. doi:10.1007/s13197-011-0365-5Klemm, Dieter; Heublein, Brigitte; Fink, Hans-Peter; Bohn, Andreas (2005). "Cellulose: Fascinating Biopolymer and Sustainable Raw Material." Angew. Chem. Int. Ed. 44 (22): 3358–93. doi:10.1002/anie.200460587Mettler, Matthew S.; Mushrif, Samir H.; Paulsen, Alex D.; Javadekar, Ashay D.; Vlachos, Dionisios G.; Dauenhauer, Paul J. (2012). "Revealing pyrolysis chemistry for biofuels production: Conversion of cellulose to furans and small oxygenates." Energy Environ. Sci. 5: 5414–5424. doi:10.1039/C1EE02743CNishiyama, Yoshiharu; Langan, Paul; Chanzy, Henri (2002). "Crystal Structure and Hydrogen-Bonding System in Cellulose Iβ from Synchrotron X-ray and Neutron Fiber Diffraction." J. Am. Chem. Soc. 124 (31): 9074–82. doi:10.1021/ja0257319Stenius, Per (2000). Forest Products Chemistry. Papermaking Science and Technology. Vol. 3. Finland: Fapet OY. ISBN 978-952-5216-03-5.