a natural occurring glue in wood that helps to hold the cellulose fibers together
Lignin is a substance related to cellulose that provides rigidity and together with cellulose forms the woody cell walls of plants and the cementing material between them.
Brown organic substance found in wood and other cellulose plants that acts as an interfiber bond in woody materials.
The binding agent that holds the cells in wood together.
Substance in trees that holds cellulose fibers together. Free sheet has most lignin removed; groundwood paper contains lignin.
Complex organic material deposited within the cell walls of plants associated with cellulose, especially in wood and fibers.
polymer of simple monophenols that occurs naturally in some plant cells, giving them their strength and stiffness.
A compound which, with cellulose, forms the cell walls of plants. It is practically indigestible.
A group of high-molecular-weight amorphous polymers of phenylpropanoid compounds, giving strength to certain tissues. A major component of wood.
a substance in some plant cell walls which makes the plant rigid.
substance that binds wood fibers together, and contributes to breakdown of paper• paper with high levels of lignin are very acidic and therefore cause materials to become yellowish and brittle
Substance in trees that holds cellulose fibers together. This is the "glue" that binds cellulose fibers together to give a tree its rigidity. This material is hydrophobic, or "water-hating," rendering the fiber too rigid for most papermaking applications. Hence, the need to separate and remove this wood component from cellulose fibers.
Polymer of aromatic alcohols which naturally impregnates wood vessels, making them impermeable and rigid; lignin represents about 25% of the weight of dry wood
This is a complex long chain molecule that is used by plants to make their tissue stronger. They allow lignin to be deposited amongst the fibres of their cell walls, and this turns the normal plant cells into 'wood', so making them much stronger and able to act as support tissue.
lignum, wood) A group of high-molecular-weight amorphous materials, comprising polymers of phenylpropanoid compounds, giving strength to certain tissues. Wood is composed of lignified xylem cells (about 15 to 30% by weight).
A glue-like substance (resins, acids, sap, etc) which provides structural support in trees. It must be washed out of the cellulose fibres to make the pulp from which paper is manufactured.
n. (L. lignum, wood) organic substances which act as binders for the cellulose fibers in wood and certain plants, and adds strength and stiffness to the cell walls. Chemical structure of lignin is composed of a polymer of high carbon content but distinct from the carbonates. Consists of C6,C3 units.
a complex polymer; the chief non-carbohydrate constituent of wood; binds to cellulose fibers to harden and strengthen cell walls of plants.
Non-cellulose material found in wood and other cellulose plants; lignin in paper makes it weaker and more inclined to discolour when exposed to light; in the chemical pulp-making process most of the lignin is removed. Lignin is present in mechanical pulp.
Along with cellulose a principal cell wall constituent.
A substance present in all woods which acts as a binder that holds the cellulose fibers together. It represents up to 30% of the wood content, and is largely removed by chemical treatment in the pulping process.
an amorphous polymer related to cellulose that cements cell walls, helping them stay rigid. Lignin is highly resistant to decomposition.
A compound that "glues" cellulose fibers together in trees. Lignin adds opacity to papers, but it also reduces brightness and whiteness.
A substance that, together with cellulose, forms the woody cell walls of plants and the connecting material between them. Lignin is resistant to decomposition.
A complex organic material that, together with cellulose, forms the woody cell walls of plants. Lignin surrounds the cellulose fibres and provides the stiffness and strength which enables trees to stand upright. It is chemically stable in wood, but becomes unstable when the wood is broken down to make paper. Lignin is susceptible to photochemical deterioration and, as it breaks down, produces acids which are extremely harmful to paper. Therefore, the preparation of pure cellulose by removing the lignin is an important step in the manufacture of pulp for the paper and rayon industries.
Structural constituent of wood and (to a lesser extent) other plant tissues, which encrusts the cell walls and cements the cells together.
An acid organic substance found in wood pulp. It is removed in the chemical pulping process, but it is not removed in the manufacture of low-grade papers made of ground wood pulp, such as newsprint.
The second most abundant component of wood. It is a cementing layer between the wood cells.
a constituent of most plant secondary wall cells to make them more rigid, waterproof and resistant to pathogen attack.
The substance that gives plants and trees their strength and rigidity, and also binds wood fibers together. When wood is broken down to make paper, the lignin becomes unstable. Paper that contains large amounts of lignin, such as newsprint, is very acidic and will turn yellow when exposed to light and humidity.
The fiber bonding material found in wood. Lignin that is left in pulp causes paper to age and yellow over time.
A three-dimensional amorphous polymer with a variable structure so complex that a definitive formula for it has never been written. It makes up 17-32% of wood, , rounding the cellulose fibers and providing the stiffness that enables trees to stand upright. It is chemically stable in wood, but becomes unstable when the wood is broken down to paper. It is removed in pulping with the use of hot chemicals followed by bleaching. Fully bleached pulp contains practically no lignin (Clark, p. 113). Paper that contains large amounts of bleached lignin, such as newsprint, deteriorates principally by oxidation, which is speeded up by light and high humidity. The lignin reverts to its natural brown color as it oxidizes. Although alkalinity also darkens the pulp noticeably, addition of calcium carbonate to the papermaking furnish will make high-yield papers chemically more stable, slowing down subsequent darkening and degradation considerably.
Lignin is another chemical compound that occurs naturally in plants as a boding element that holds fibres together. If Lignin is not removed from wood fibre and pulp at the time of manufacturing, paper products will still contain varying amounts of lignin. Lignin will also cause deterioration of the paper product over time by discolouring and becoming brittle. Again, when purchasing your paper products to use in your scrapbook, we recommend that you read the label to make sure it is "LIGNIN FREE". If you want to use newspaper articles in your scrapbook, it is recommended that the article be scanned on a PC and printed or photocopied onto suitable scrapbooking paper (acid and lignin free).
An organic substance which, with cellulose, forms the chief part of woody tissue.
unwanted part of woody plants, can cause degradation later in the life of the paper.
Stiffening material in cell-walls of woody tissue.
Embedded in the cellular structure of plants, Lignin contributes to their strength and rigidity and is found naturally, along with cellulose. It is thought that Lignin contributes to chemical degradation. To a large extent, it can be removed during manufacture.
Lignin is the natural bonding element which holds wood fibers together. Newsprint contains lignin—you'll notice how brittle and yellowed a newspaper becomes after just a few days. Like acid, lignin can be removed during processing to make scrapbooking paper safe. If lignin remains in the final paper (like with newsprint), it will become yellow and brittle over time. Most paper other than newsprint is lignin-free.
The primary noncarbohydrate constituent found in wood; a polymer that functions as a natural binder.
woody skeletal components of plant life. It is unaffected by digestion, does not absorb moisture, and passes through the intestinal tract unchanged
An organic substance which acts as a binder for the cellulose fibers in wood and certain plants and adds strength and stiffness to the cell wall
natural aromatic polymer that is found in the cell walls of grasses and woody plants. Lignin and hemicellulose cement the fiber cells together. Lignin composes 17-30% of wood. In the destructive distillation of wood, it decomposes to produce methanol. In the manufacture of paper pulp by the chemical processes, the 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 as a stabilizer, binder, dye dispersant and filler in phenolic plastic products and as a source of vanillin.] - from Boston MFA Conservation and Art Materials Dictionary http://www.mfa.org/conservation/qsearch.htm (May 3, 2001)
A tough, durable plant substance deposited in cell walls, especially in wood.
An organic compound which is the main non-cellulosic constituent of wood and bonds the cellulose fibres together. During pulping, chemicals dissolve the lignin, thus releasing the cellulose fibres as pulp.
Organic compound containing carbon that gives stems their "woodiness"
An organic substance found in the wood pulp used to make paper. Lignin can become unstable and acidic over time, causing paper to yellow and deteriorate.
A polymeric material largely responsible for the strength of wood, and making up 16-34% of wood. Its nature is not fully understood, but it is considered to be a complex cross-linked, highly aromatic structure of high molecular weight which is readily oxidized. It is not a compound but a system, and its composition varies. It is more or less completely removed during chemical pulping, and further removed by bleaching. A spot test for detection of lignin or groundwood is described in Appendix F of "Fiber Analysis of Paper and Paperboard," T 401 om-82. Like the Barrow spot test for groundwood, it uses phloroglucinol, and cannot detect very small amounts.
Non-carbohydrate component of cell wall that gives wood its elastic quality. Along with cellulose hardens and strengthens the cell walls of plants.
the characteristic hardening material of wood
unpurified wood pulp commonly found in modern newsprint and other poor quality papers. It usually turns yellow over time and especially with exposure to sun light.
One of the major components of wood. This is the “glue” that binds cellulose fibers together to give a tree its rigidity. This material is hydrophobic, or “water-hating,” rendering the fiber too rigid for most papermaking applications. Hence, the need to separate and remove this wood component from cellulose fibers.
An organic substance which acts as a binder for cellulose fibers in wood and certain plants, adding strength and stiffness to cell walls. Lignin is undesirable in the production of fine, permanent papers because it reacts with light and/or heat to produce henols (alcohols) and acids, which cause deterioration and embrittlement of the paper.
Natural adhesive which binds wood fibres together in the tree and imparts rigidity. Pulp brightness depends on the amount of lignin remaining in the pulp
Complex woody polymers found in vascular plants.
A naturally occurring acid substance in wood that breaks down over time. Paper with lignin is not suitable for archival projects.
The "glue" that binds the cells of the tree and creates its structure. Approximately one-third of the tree is lignin.
polymer in the secondary cell wall of woody plant cells that helps to strengthen and stiffen the wall; related term lignified.
this is the binding substance in natural fibres and is a complex organic polymer with an irregular structure
(3) the major noncellulose constituent of wood.
Lignin occurs in most plant cell walls and gives structural strength to the plant. Lignin is unstable and becomes acidic as it breaks down. The acid that forms can migrate to framed art unless the mat is buffered, turning the paper brown and causing it to dry.
The binding material in plants that gives them their strength and rigidity. Paper that contains lignin, such as newsprint, will turn yellow quickly when exposed to light, heat, and humidity. Lignin will degrade paper (causing discoloration and brittleness) and photographs (causing staining, fading mirroring and spotting).
One of the three main constituents of wood, along with cellulose and hemi-cellulose. Lignin acts as the cementing agent in wood, binding the cellulose fibres together. See also Cellulose.
a hard substance embedded in the cellulose of plant cell walls that provides support.
A substance that forms the woody cell walls of plants and the "cement" between them. Lignin is found together with cellulose and is resistant to biological decomposition.
Glue-like component of biomasses that keeps plant fibres together; major component of biomasses besides cellulose and hemicelluloses. See also: cellulose, hemicellulose
Acidic substance that naturally occurs in wood that breaks down over time. Paper that is not lignin-free is not recommended for archival projects.
is a polyphenolic amorphous polymer which binds wood fibres together in the tree and imparts rigidity and brown colour.
The natural, gluelike substance that holds together the cellulose fibers of a plant. Any lignin left in the pulp can cause paper to age and yellow over time.
The complex woody fibres of plant tissue that resist decomposition.
Substance in trees that, if not removed from pulp, causes paper to deteriorate rapidly.
Bonding material that holds wood fibers together. Poses a danger to scrapbooks because paper that is not lignin-free (such as newspaper) is likely to become yellow and brittle over time.
Polymer, which binds the fibres in the wood together and gives them stiffness
One of the principal chemical constituents of wood cellular tissue – the binding agent
The bonding element that naturally holds wood fibers together. It's found in newsprint, cheap paperback books and old documents.
The major component of wood after cellulose, accounting for about 25% of wood. Lignin gives wood its dark brown colour. Chemical pulping removes it from the process.
A substance found in wood that binds to cellulose fibers to make the cell wall of plants. In other words, the stuff that makes your paper turn yellow and brown.
A component of the cell walls of plants, along with cellulose. Lignin is largely responsible for the strength and rigidity of plants, but its presence in paper and board is believed to contribute to chemical degradation. There can be large amounts of lignin present in pulp made form wood. It is not removed in the production of mechanical pulp, but using chemical processes, it can be optimally removed.
A biologically resistant fibrous compound deposited in the cell walls of cellulose whose purpose is for strength and support of stems, branches, roots, etc.
Lignin is a type of insoluble fiber, contained in the woody parts of plants. It has protective properties in the colon.
A complex aromatic compound which is deposited in the cellulose cell walls of the xylem and sclerenchyma during the process of secondary thickening. Wood is made mostly of lignin.
A natural material, which holds wood cells together. It causes the break down of paper over time.
Woody,” non-fiber components of plant cell walls. It is completely indigestible to animals at any stage of a plant's maturity. Lignin concentration increases as plants mature.
A complex carbohydrate found in woody plants that increases the strength of plant tissues
A hard-to-degrade compound that is part of the structure of older or woody plants. The carbon rings in lignin can be degraded by a few fungi.
A complex organic polymer that is deposited within the cellulose of a plants cell walls during thickening to make the wall rigid.
A component of the cell walls of plants that occurs naturally, along with cellulose. Lignin is largely responsible for the strength and rigidity of plants, but its presence in paper is believed to contribute to chemical degradation. To a large extent, Lignin can be removed during manufacturing.
Chemical component of wood. Lignin is a three-dimensional, highly polymerized substance composed of 100 and more phenyl propane units. Lignin cements the fibres together in wood and makes the fibres stiff.
Wood substance that makes up about 30% of the total wood content. Lignin is dissolved in the cooking process in pulp-making and is burnt together with dissolved carbohydrates as biofuel (black liquor) in the soda recovery boiler for energy production.
Thickening substance found in cell walls of plants
A plant material which, in conjunction with cellulose, forms the cell walls and the cementing material between them in woods and many plants.
General term for the non-cellulose wood component (lignin sulfuric acid or desulfonate sulfuric acid). It is the main component of the additives for negative lead masses with a component share of ≤1%. It is sold under the name Vanisperse.
The principal noncarbohydrate component of wood, a polymer that binds together cellulose fibrils in some plant cell walls.
A natural plant fibre found in wood that breaks down over time. Paper with lignin is not suitable for archival projects and can turn photos and paper brown.
The natural, glue-like substance that holds together the cellulose fibers of wood plants. Lignin that is left in pulp causes paper to age and yellow over time.
Lignin (sometimes "lignen") is a chemical compound that is most commonly derived from wood and is an integral part of the cell walls of plants, especially in tracheids, xylem fibres and sclereids. It is one of most abundant organic compounds on earth after cellulose and chitin. Lignin makes up about one-quarter to one-third of the dry mass of wood.