Lignin

From Academic Kids

Lignin is a chemical compound that is an integral part of the cell walls of some cells, eg tracheids, xylary fibres and sclereids of plants.

Lignin is the irreversible removal of water from sugars, creating aromatic compounds through the phenylpropanoid pathway. Lignin polymers are cross-connected structures with a molecular weights on the order of 10,000 amu.

Lignin is the most abundant organic material on earth after cellulose. The strength of wood is a result of lignin, which makes up about one-quarter to one-third of the mass of dry wood. Lignin is removed from wood pulp before it is turned into paper, and the extracted lignin is used as a binder in particleboard, adhesive for linoleum, and raw material for processing into chemicals (such as DMSO and vanillin). The type of lignin (such as lignosulfonates and kraft lignins) used in industry depends upon the method that was used to extract it.

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Lignin.jpg
These photos show three big phases of the formation of a conductive vessel. Note the shape of the nucleus (N) and of the nucleolus (n), which occupy the totality of the surface of the cell. It is an undifferentiated cell or meristematic (Procambium tissue). In the nucleus, note the presence of white corpuscles. If this tissue is treated with the auxine (AIA), differentiation begins. The black arrow indicates the beginning of clarification around a globule. This clarification will eventually become a totally degraded zone (Dz). The process of general degradation of the nucleus and the cytoplasm continues until the appearance of a vessel (V) , type Helicoidal (Sp). In this process, it is so possible that molecules stemming from the degradation of the ADN or the ARN are incorporated into the formation of the lignin.

External links

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