Sugar oligosaccharides containing

Initially, a 14-sugar oligosaccharide containing N-acetylglucosamine, mannose and glucose, known as the precursor oligosaccharide, is added en bloc to the side... 

As a further illustration of the scope for use of 1,6-anhydro sugars in the preparation of uncommon sugars, the rare L-idose derivative 210 has been prepared recently and used in the preparation of oligosaccharides containing iduronic acid... 

Oligo means a few or some. It follows that oligosaccharides contain a few monosaccharide units. The simplest oligosaccharides are the disaccharides, which contain two monosaccharide units. These are followed by the trisaccharides, which contain three and so forth. The most common disaccharide is sucrose, common table sugar. 

Carbohydrates constitute a major class of naturally occurring organic compounds, including sugars, starches, and celluloses. They are essential to the maintenance of plant and animal life. Carbohydrates are classified into three major groups monosaccharides, oligosaccharides,1 and polysaccharides. Monosacchandes are the simplest carbohydrate units. Oligosaccharides contain two or more of these simple mono sacchande units, and polysaccharides contain hundreds or thousands of them. 

The main approaches used for identification of natural isomers of 5,7-diamino-3,5,7,9-tetradeoxynon-2-ulosonic acids and determination of structures of bacterial poly- and oligosaccharides-containing derivatives of these sugars were H and 13C NMR spectroscopy. This could be applied to both intact natural glycopolymers and carbohydrate portions obtained after delipidation of LPS as well as to oligosaccharide fragments and... 

Oxidation of 2-acetamido-2-deoxy-D-glucose derivatives with hypoiodite at 0° proceeds quantitatively, without side reactions, and is satisfactory as a procedure for end-group assay in oligosaccharides containing amino sugar residues.177 The possibility that (1 —> 3)-linked disaccharides may be degraded under the reaction conditions must not be overlooked. 

Whilst there appears to be limited scope at present for the utilization of these observations in determinations of polysaccharide structures, they can be of value when the Morgan-Elson test is applied to oligosaccharides containing amino sugar residues, as the work on the oligosaccharides from human milk2 has shown. Obviously, no simple relation exists between a positive test and the presence of free 2-acetamido-2-deoxyhexose, but much information may be culled by a consideration of all the factors outlined above. 

The oligosaccharides containing amino sugar residues have received considerable attention during the last few years, and numerous compounds of this type are now known (seeTable III). Degradation of certain polysaccha-... 

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