Ester linkages between lignin and glucuronoxylan in a lignin-carbohydrate complex from beech (Fagus crenata) wood

Isolation, characterization and enzymatic modification of water soluble xylans from Eucalyptus grandis wood and sugarcane bagasse

“…25,45,67 Low yields and purity of extracted xylan due to the presence of extractives and lignin were also highlighted by other workers. 41,68,69,70,71,72 Enzyme mediated precipitation of the extracted xylans The proton and carbon resonances in the 1 H NMR and 13 C NMR spectra ( Fig. 2(a)-(d)) and sugar compositions (Table 1) confirmed the presence of xylose, 4-O-methylglucuronic acid and arabinose residues in the xylan extracted from the bagasse and E. grandis feedstocks.…”

AspergillusEnzymes Involved in Degradation of Plant Cell Wall Polysaccharides

“…They have been shown to occur between arabinoxylans from bamboo shoot cell walls (162), between pectin polymers in sugar beet (275), and between lignin and xylan in wheat (22). A second type of crosslink is the ester linkage between lignin and glucuronic acid attached to xylan, which was identified in beech wood (160,359). Recently, indications of a third type of cross-linking have been reported involving a protein-and pH-dependent binding of pectin and glucuronoarabinoxylan to xyloglucan (311)…”

Binding-site Analysis of the Ether Linkages between Lignin and Hemicelluloses in Lignin–Carbohydrate Complexes by DDQ-Oxidation

“…So far, lignin--carbohydrate linkages of the ester, [6][7][8][9][10][17][18][19][20] ether,4,7,11,12,21,22) glycoside, 5,6,23,24) and acetal 25 ) types have been proposed, based on the chemical and/or enzymatic treatment of LCCs. In particular, the existence of the benzyl ether and ester types has often be suggested, not only from the formation of DHP-sugar complexes, [26][27][28][29] but also from chemical analyses of the LCCs.…”