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Polysaccharides are present in all living organisms where they carry out one or more of their diverse functions. While there is no specific category or definition of a complex polysaccharide, most are structurally complex. Polysaccharides contain 1–5 different monosaccharide (sugar) units. The different sugar units may have different anomeric configurations and/or be joined by different glycosidic linkages. Polysaccharides may be linear or branched. Branches may be short saccharide units on a linear backbone or the molecule may have a branch-on-branch structure; in either case, the branches may be isolated or clustered. Polysaccharides may contain non‐carbohydrate groups. Esters or cyclic acetal groups, when present, can be removed by appropriate treatments. All polysaccharides are polydisperse, i. e., are present in a range of molecular weights rather than having a single molecular weight

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The differences in the properties of the polysaccharides are associated with how monosaccharide (e.g. glucose) molecules are arranged in the different polysaccharides.

  • Polysaccharides are polymers composed of monosaccharide monomers joined by glycosidic bonds.

  • The glucose (C₆H₁₂O₆) molecule is a monosaccharide made up of 6 carbon (C) atoms and an aldehyde group.

  • For example, glycogen, starch, and cellulose are complex (long) carbohydrates composed of glucose monomers.

  • Complex polysaccharides can be classified into branched polysaccharides and unbranched polysaccharides.

  • An unbranched polysaccharide is a linear chain of monosaccharides, whereas a branched polysaccharide is a chain of monosaccharides containing arms and turns.

  • Polysaccharides can serve as storage of energy (e.g. glycogen), and as structural components (e.g., cellulose).

In conclusion, the properties of the polysaccharides depend on how different monosaccharides (e.g., glucose molecules) are arranged in polysaccharides.

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