Xylan, algal

From these results, algal xylan appears to be analogous to lichenin, which is constructed of 1 —> 3 and 1 —> 4 linkages between D-glucose residues, and is thus different from the known xylans185 of land plants. 

Dimethyl-D-xylose has been isolated from the products of hydrolysis of the methylated seed mucilages of Plantago lanceolate,1 and P. ovata11 and from the algal xylan of Rhodymenia palmate,. ... 

The marine algal D-xylan obtained from Rhodymenia palmata has been shown250-251 to be composed of /3-d-(1 — 3)- and /3-D-(l — 4)-linked D-xylose residues in a single D-xylan chain, and it is suscep-... 

The reaction of beech wood xylan in N2O4/DMF with SO2 or SO3 yields sulfuric acid half esters of low DS (0.17-0.55) compared with the sulfation of cellulose due to the absence of reactive primary hydroxyl groups in the xylan structure (10). Moreover, algal cell wall microfibril homoxylan (P-l->3-xyIan) was sulfated with S03-pyridine under mild conditions and investigated with regard to the sulfation regioselectivity by means of different NMR techniques... 

Figure 1 The key components in the algal cell wall (a) cellulose, (b)mannan, (c) alginic acid, (d) fucoidan and (e) xylan.

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