Lignin cell walls

In plant cell walls, lignin monomers seem to be present in vivo in the form of cinnamyl alcohols. In vitro, their acid precursors can also be oxidized by peroxidases (3). In order to gain further insight into the possible... 

Interestingly, the amount of cell wall lignin deposition in the vascular apparatus can vary from a few percent to approximately 30% depending on the plant species, this in turn depending on whether they are of nonwoody or woody character. Lignins are, however, essentially absent from algae, true aquatic plants, and basal land... 

Source Number Cell Wall Lignin Digestibility SiO,... 

Lignin makes up to 15-35% of fresh wood, with 60-80% of the lignin located in the secondary wall. The middle lamella-primary wall complex has the higher concentration (0.6-0.9 g/g), as compared to the secondary wall (0.2-0.3 g/g). In the cell wall, lignin, hemicellulose, and pectin fill the interstices between the cellulose microfibrils. Lignin may be bound to hemi-celluloses, the most unstable of the biopolymers in wood, and thus hemicellulose loss would expose the lignin to chemical changes. 

The polymer of phenylpropanoid units is lignin, which is not composed of saccharide units, but is associated with cellulose as well as with structural non-cellulose polysaccharides, is also a structural material of plant cell walls. Lignin is accompanied by other phenohc compounds (tannins), proteins and polymers ofKpids. 

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