Chapter 7 carboxylic COOH O OH<+hydroxyl in p-isomer position C-1 asymmetric carbon atom OH B-D-glucose a-D-galacturonic acid pyranose form, six-membered ring) a= position of the hydroxyl on C-2 in D-mannose b= position of the hydroxyl on 4 in D-galacto O OH L-glucose COOH H2N-CH CH3 CH,OH CH2 H→c一NH CH2 COOH COOH COOH serine L-glutamic acid COOH Cl HOH CH2 CH3 c CH2 COOH COOH SuCcInIc Figure 7.1 Structures of some of the components of microbial exopolysaccharides rare sugars Examples of rare sugars which have been found in some microbial polysaccharides are: Logit196 Chapter 7 Figure 7.1 Structures of some of the components of microbial exopolysaccharides. rare sugars Examples of rare sugars which have been found in some microbial polysaccharides are: L-glucose; L-galactose;