POLYSACCHARIDES

**Definition:** This place covers:

**Limiting references (this place does not cover):** - Layered products -> B32B - Mono-, di- or oligosaccharides with five or less saccharide radicals -> C07H - Grafted polysaccharides obtained by reaction of an unsaturated monomer onto a polysaccharide -> C08F251/00 - Grafted polysaccharides obtained by reaction of an unsaturated monomer onto a cellulose or derivative thereof -> C08F251/02 - Grafted or block polysaccharides obtained by reaction of a polymer with a polysaccharide -> C08G81/00 - Fermentation or enzyme-using processes to synthesize polysaccharides -> C12P19/04 - Production of cellulose -> D21

**Glossary:** - Saccharide radical: Saccharide radicals are monosaccharide repeating units. - Glycosodic linkage: A glycosidic bond is a type of covalent bond that joins a carbohydrate molecule to another group, which may or may not be another carbohydrate. A glycosidic bond is formed between the hemiacetal group of a saccharide (or a molecule derived from a saccharide) and the hydroxyl group of some organic compound. If the group attached to the carbohydrate residue is not another saccharide it is referred to as an aglycone. If it is another saccharide, the resulting units can be termed as being at the reducing end or the terminal end of the structure. The reducing end of the di- or polysaccharide is towards the last anomeric carbon of the structure, and the terminal end is in the opposite direction.One distinguishes between α- and β-glycosidic bonds based on the relative stereochemistry of the anomeric position and the stereocentre furthest from C1 in the saccharide. In D-hexose sugars in their pyranose forms, an α-glycosidic bond is formed in an axial orientation, whereas a β-glycosidic bond will be oriented equatorially.