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Glucuronic 3-0-methyl

The conformational equilibria of methyl D-glucuronal, methyl D-galacturonal, methyl L-guluronal, and methyl L-alluronal and a number of related glycals haye been compared by means of H n.m.r. spectroscopy. An n.m.r. study of t-butyl(methyl 3 4-dideoxy-... [Pg.218]

P -D-xylan with 3-hnked a-L-arabiaose branches (1 4)-P -D-xylan with 2-Unked 4-0-methyl-a-D-glucuronic acid and arabiaose branches... [Pg.70]

Most of the glucuronoxylans have single 4-0-methyl-o -D-glucopyranosyl uronic acid residues (MeGlcA) attached always at position 2 of the main chain Xylp units (Fig. 2). This structural type is usually named as 4-0-methyl-D-glucurono-D-xylan (MGX). However, the glucuronic acid side chain may be present in both the 4-0-methylated and non-methylated forms (GlcA). [Pg.7]

A recent study on wheat bran GAX [34] revealed the presence of lowly and highly substituted GAX fractions, which greatly differ in the amount and type of substitution by the Ara/ imits, but not in the content of the glucuronic acid, half of which occurs as the 4-0-methyl ether. Feruloylated GAX fractions were isolated from wheat bran by cold water, steam and dilute alkah [35]. The yields of water and steam-extracted material were 1.5 and 20-31%, respectively, however, they contained 1.5% and 19-28%, respectively, of GAX. The alkah extraction yielded 10-30% material containing more than 90% of the GAX with moderate FA content. [Pg.10]

CN D-glucuronic acid compd. with 5-methyl-6-[[(3,4,5-trimethoxyphenyl)amino]methyl]-2,4-quinazolinediamine (1 1)... [Pg.2120]

The NMR spectrum of the dry sample showed broad unresolved peaks that correspond to a typical mixture of 4-O-methyl-D-glucuronic acid, L-arabinose and D-xylose, and proteins (Oliveira et al., 2010) (Figure 5). [Pg.68]

In phase 2, the hydroxylated or other compounds produced in phase 1 are converted by specific enzymes to various polar metabohtes by conjugation with glucuronic acid, sulfate, acetate, glutathione, or certain amino acids, or by methylation. [Pg.626]

A series of derivatives analogous to those from D-glucuronic acid has been made by Morell and Link.68 An important compound is the crystalline methyl ester of methyl a-D-galacturonoside (XXXII) which on alkaline hydrolysis yields methyl a-D-galacturonoside (XXXIII). Since... [Pg.192]

In a recent paper650 the relationships between Rhizobium radicicolum polysaccharides and those of pneumococcus are indicated by crossprecipitin reactions of the former with Types III and VI anti-pneumococcus horse sera. In addition, hydrolysis of the methylated polysaccharide of Rhizobium radicicolum yields equal amounts of 2,3,6-trimethyl-D-glucose, 2,3-dimethyl-D-glucose and 2,3-dimethyl-D-glucuronic acid.65 1 The minimum trisaccharide repeating unit consists, in part, of cello-biuronic acid, and may be represented ... [Pg.237]

Reeves and Goebel72 have shown that hydrolysis of the reduced methylated capsular polysaccharide of Type III pneumococcus yields 2,3,6-trimethyl-D-glucose and the anomeric forms of methyl 2,4-dimethyl-D-glucoside. The cellobiuronic acid units in the polysaccharide are thus linked through position 3 of the D-glucuronic acid residue, probably by /3-D-linkages. That is, the polysaccharide contains alternate 1,3-and l,4-/3-D-linkages. [Pg.239]

Figure 11.5 Formation of methylated saccharinic acids from glucose and cellulose, and methylated deoxyglucaric acid from glucuronic acid [66,681... Figure 11.5 Formation of methylated saccharinic acids from glucose and cellulose, and methylated deoxyglucaric acid from glucuronic acid [66,681...

See other pages where Glucuronic 3-0-methyl is mentioned: [Pg.267]    [Pg.52]    [Pg.582]    [Pg.30]    [Pg.31]    [Pg.32]    [Pg.484]    [Pg.356]    [Pg.234]    [Pg.252]    [Pg.7]    [Pg.14]    [Pg.3]    [Pg.6]    [Pg.8]    [Pg.4]    [Pg.267]    [Pg.102]    [Pg.225]    [Pg.138]    [Pg.167]    [Pg.5]    [Pg.109]    [Pg.554]    [Pg.554]    [Pg.71]    [Pg.173]    [Pg.198]    [Pg.308]    [Pg.123]    [Pg.188]    [Pg.191]    [Pg.200]    [Pg.316]    [Pg.8]    [Pg.8]    [Pg.261]   
See also in sourсe #XX -- [ Pg.261 ]

See also in sourсe #XX -- [ Pg.50 , Pg.430 , Pg.433 , Pg.443 ]

See also in sourсe #XX -- [ Pg.187 , Pg.189 ]

See also in sourсe #XX -- [ Pg.254 ]




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