With a hyperbranched macromolecular structure, lignin is composed of three different phenylpropane
units: p-coumaryl alcohol, coniferyl alcohol, and sinapyl alcohol and contains various functional groups, like hydroxyl, carboxyl acid, methoxyl, ether, and ester groups .
(2007) assumed that large fragments have a better chance to contribute to polymerization because of the presence of a larger number of phenylpropane
Lignin is an amorphous, three-dimensional, highly branched polyphenolic substance consisting of an irregular array of hydroxy-/methoxy-substituted phenylpropane
units supported by [beta]-O-4, [alpha]-O-4, 5-5, [beta]-5, and [beta]-[beta] linkages [3, 7, 8].
Lignin is composed of three different types of phenylpropane
Allium tuberosum Rottler has two new phenylpropane
glycosides and four known flavonoids (kaempferol 3-O-[beta]-sophoroside; 3-O-[beta]-D-(2-Oferuloyl)-glucosyl-7,4-di-O-[beta]-D-glucosyl- kaempferol; 3-O-[beta]-sophorosyl-7-O-[beta]-D-(2-O-feruloyl) glucosyl-kaempferol; and kaempferol 3,4'-di-O-[beta]-D-glucoside) .
Flavonoids are the largely occurring phenols formed of three acetate units and a phenylpropane
PAL is the first enzyme in phenylpropane
Lignin is an amorphous polymer consisting of phenylpropane
Lignin absorbs UV light with high molar extinction coefficients because of the several methoxylated phenylpropane
units of which they are composed .
The chemical structure of lignin is irregular because the different structural units (e.g., phenylpropane
units) are not linked to each other in any systematic order.
Lignin is a highly branched polymer composed of phenylpropane
units organized in a complex three-dimensional structure.
It is a complex polymer consisting of cross linked phenylpropane
units which contains large numbers of various types of ether linkages and free phenol groups.