Hexose repeat unit

Solution, (a) Starch is a polymer based on a hexose repeat unit (glucose, specifically) with the chemical formula C6H12O6. 

In the polymers synthesized, the repeating units are joined together by phosphoric diester linkages between C-1 of D-glycerol and C-6 of the hexose. For these reactions, there is a question as to whether the repeating unit is preassembled and then polymerized, or whether each component of the chain is added in a strictly sequential way. Burger and Glaser could find no evidence for the presence of a nucleo-... 

Chemical and enzymic studies have shown that the O-specific side-chains of the lipopolysaccharide from E. coli O 69 are composed of the tetrasaccharide repeating-unit (6) " and that the hexose region of the lipopolysaccharide from E. coli C is composed of the pentasaccharide (7). ... 

HEXOSANS. Hexosans are polysaccharide sugars which contain hexoses as their respective repeating units. 

The O-specific polysaccharide of the lipopolysaccharide from Yersinia pseudotuberculosis type IB contains residues of o-mannose, L-fucose, 3,6-dideoxy-D-r/6o-hexose (paratose), and 2-acetamido-2-deoxy-D-glucose. The repeating unit (12) of the polysaccharide was assigned on the basis of methylation analysis,... 

Glycosaminoglycans (GAGs) are unbranched chains having repeating disaccharide units, which, with the exception of keratan sulfate, contain an acid and a base. The KS disaccharide unit consists of a hexose and a base. The structures of the different classes of GAG disaccharide units are given in Fig. 1, and summarized in Table I. 

Keratan sulfate is very much the odd one out in the polysaccharides embraced by the term glycosaminoglycan since it contains no uronic acid. In place of the uronic acid residue in other glycosaminoglycans, there is a neutral hexose unit— n-galactose. The second component monosaccharide is normal being a 2-acetamido-2-deoxyhexose. The repeating disaccharide unit of keratan sulfate is -0-jS-D-galactopyranosyl-(l- 4)-O- (2-acetamido-2-deoxy- 3-D-glucopyranosyl 6-sulfate) - (1 3) - ( VIII)... 

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