Difference between revisions of "Lignin"
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== Authority ==
== Authority ==
Revision as of 12:04, 17 July 2015
An natural aromatic polymer found in the cell walls of grasses and woody plants. Lignin and Hemicellulose cement the fiber cells together. Lignin composes 17-30% of wood and thus Mechanical wood pulp also contains lignin. In the manufacture of paper pulp by chemical processes, lignin is removed by reaction with alkaline or sulfur compounds. The presence of lignin in paper shortens its overall lifetime as lignin can photo-oxidize to form acidic products which can then attack the cellulose. The lignin produced as a waste-product in the manufacture of paper is used in phenolic plastic products as a stabilizer, binder, dye dispersant, and filler. It is also a source of vanillin. In the destructive distillation of wood, lignin decomposes to produce methanol.
Synonyms and Related Terms
Insoluble in water and most solvents.
Lignin will stain yellow when treated with Graff "C" stain. This stain is often used to determine the presence of lignin in paper samples and for paper fiber identification.
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