Xylose structure

Table IV shows the pyrolysis products formed from xylan at 300° (9). The pyrolysis of xylan yields about 16% of tar which contains 17% of a mixture of oligosaccharides. Upon acid hydrolysis, they give an approximately 54% yield ofj-xylose. Structural analysis of the polymers shows that they are branched-chain...

Tomatine is tomatidine-3/3-lycotetrose. The lycotetrose moiety has a galactose attached to the 3-hydroxyl-group of tomatidine that is substituted on its 4-hydroxyl by a glucose. This glucose is further substituted at its 2-hydroxyl by another glucose and at its 4-hydroxyl by a xylose. Structures for muldamine and 225,25R- solanidanes (representing solanidanes both saturated and unsaturated at C-S, C-6) are shown below. 

Work with cations includes examination of the viscosity effects of sodium and potassium halides on solutions of xylose (structure-making and structurebreaking trends were studied), calorimetric analysis of the interaction of calcium ions with D-galactose, myo-inositol, and lactose, and conductance... 

Glc = glucose GlcA = glucuronic acid GulA = guluronic acid Man = mannose ManA = mannuronic acid Rha = rhamnose Xyl = xylose Fuc = fucose. Chemical structures and properties are available (19). 

Carrel, H.L., et al. X-ray structure of D-xylose isomerase from Streptomyces nibiginosus at 4 A resolution. 

Refer to the Fischer projection of D-(+)-xylose in Figure 25.2 (Section 25.4) and give structural formulas for... 

The glycosyl-residue compositions of the three purified fractions (Table 1) were very similar with a predominance of galacturonic acid, rhamnose and arabinose. The presence in the three purified fractions of the rare monosaccharides characteristic of RG-II (e.g. 2-( -methyl-L-fucose, 2-O-methyl-D-xylose, apiose, Kdo, Dha and aceric acid) was confirmed by GC-CIMS analysis. The molar ratios corresponded approximately to the known structure of the RG-II molecule (Figure 1) and to previously published data for RG-II from sycamore [26], rice [4], arabidospis leaves [8] and Pectinol [12]. 

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