9005-53-2 Usage
Description
An abundant phenylpropane polymer found in all vascular plants.
Lignin acts as the "glue" for cellulose and hemicellulose constit uents of plants, and the three substances comprise the major cell
wall components of cellulosic plants, e.g., woody and grassy
plants. These substances are bound tightly and may only be sep arated under vigorous conditions. Lignin finds use as a drilling
fluid additive, asphalt emulsion stabilizer, protein precipitant, rub ber strengthener and precursor for the synthesis of phenol, vanillin
and other products.
Chemical Properties
The term "lignin" is derived from the Latin lignum for wood, and woody plants or parts of plants contain large quantities of this substance. lignin is an irnportant skeletal component of secondary cell walls and is thus not found in young plants or parts of plants that are still growing. It is lignin that provides the hardness and rigidity of tree trunks and the sterns of perennial plants. In the cell wall, lignin is bound to other components, notably hemicelluloses. The lignin-cellulose-hemicellulose complex has economic irnportance in the production of paper from wood. The strong bonds linking cellulosic material to lignin render the former inaccessible to enzyme hydrolysis, and thus lignin has a direct influence on the digestibility, and hence the nutritive value, of herbage plants to grazing animals. In herbage plants, lignin is also bonded to cell wall protein.
Lignification of plants affects the palatability of fruits and vegetables. Thus, the unpleasant "stone cells" in pears are due to lignification, and many root and stern crops, such as carrots, beetroot, celery or asparagus, when old become inedible through lignification.
Uses
Source of vanillin, syringic aldehyde, dimethyl sulfoxide, Lignin (Dealkaline) can be extender for phenolic plastics, to strengthen rubber (esp for shoe soles), as oil mud additive, to stabilize asphalt emulsions, to precipitate proteins.
Agricultural Uses
The overall appearance of lichens is described as
crustose (they make a thin and flat crust on the
substratum), foliose or fruticose (upright, branched
forms, resembling shrubs). Lichens grow slowly from a
few millimeters to several meters each year. They
reproduce mostly by the development of apothecia or
perithecia, forming new lichens on germination of the
ascospores only in the presence of the algal partner in
whose absence the fungus dies.
Nearly 700 chemicals, which are unique to lichens,
help lichens to survive and ward off attacks by bacteria,
other fungi and grazing herbivores.
Lichens belong to soil-crust communities and help
stabilize soils, especially in desert areas. Cyanolichens contribute to fixing nitrogen to the ecosystem in which
they grow. LicheGare used for identifying the age of the
surface (on which they grow) by a technique, called
lichenometry..
Lichens are pollution indicators because of their
differential sensitivity to sulphur dioxide (SO2), nitrogen
dioxide (NO2) and ozone, as well as their ability to absorb
and accumulate heavy metals and radionuclides..
Substances like pigments, toxins, antibiotics, etc. are
obtained from lichens, which are especially useful as a
source of dyes (for example, Roccella, providing litmus),
medicines and perfumes. Some lichens, like Iceland moss
and reindeer moss, are used as food in arctic regions.
Check Digit Verification of cas no
The CAS Registry Mumber 9005-53-2 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 9,0,0 and 5 respectively; the second part has 2 digits, 5 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 9005-53:
(6*9)+(5*0)+(4*0)+(3*5)+(2*5)+(1*3)=82
82 % 10 = 2
So 9005-53-2 is a valid CAS Registry Number.
9005-53-2Relevant articles and documents
Photocatalytic degradation of lignin and lignin models, using titanium dioxide: The role of the hydroxyl radical
MacHado, Antonio E.H.,Furuyama, Aline M.,Falone, Sandra Z.,Ruggiero, Reinaldo,Perez, Denilson Da Silva,Castellan, Alain
, p. 115 - 124 (2000)
The role of hydroxyl radicals on the degradation of lignins during a cellulosic pulp bleaching process including a photocatalytic stage, was assessed using peroxyformic acid lignins EL1 and REL1 and two phenolic biphenyl lignin models 1 and 2. The irradiations were performed in the absence of photocatalyst TiO2 and H2O2 (condition a), in the presence of TiO2 (condition b) and in the presence of H2O2 (condition c). The experiments were conducted in alkaline (pH? 11) aqueous ethanol solutions with oxygen bubbling. The relative phenolic content of the irradiated solutions, which is indicative of the involvement of hydroxyl radicals, was determined by ionization absorption spectroscopy. The results obtained show that the catalyzed reaction involves both degradation of the phenolate groups by electron transfer and hydroxylation of the lignin aromatic structure. Benzyl alcohol structural elements in sodium borohydride reduced lignin REL1 and compound 2 were also found as good trapping agents for the hydroxyl radicals. The degradation of EL1 was studied by measuring its fluorescence emission by comparison to the fluorescence of compound 2. The emission spectra indicate that some biphenyl phenolate anions in EL1 are reacting under UV/visible irradiation and some others, probably polyphenolic chromophores emitting less fluorescence, are formed.
