Crystallographic studies of carbohydrates

Area of Science:

• Carbohydrate Chemistry
• Crystallography
• Materials Science

Background:

• Monosaccharides are fundamental building blocks for numerous industrial and biological macromolecules.
• The Cambridge Structural Database contains extensive crystallographic data on carbohydrates, particularly monosaccharides and their salts.
• Oligosaccharides are less represented, with limited examples of trisaccharides and larger structures.

Purpose of the Study:

• To analyze the representation and structural characteristics of carbohydrates within the Cambridge Structural Database.
• To investigate conformational factors like the Hassel-Ottar and anomeric effects using crystallographic data.
• To explore the role of hydrogen bonding and the formation of networks in carbohydrate crystal structures.

Main Methods:

• Analysis of approximately 2000 crystal structures from the carbohydrate class in the Cambridge Structural Database.
• Examination of crystallographic data to study conformational effects (Hassel-Ottar and anomeric effects).
• Characterization of hydrogen bonding patterns, including chains, networks in hydrates, and cyclic systems in cyclodextrins.

Main Results:

• Monosaccharides are well-represented, while their corresponding acids are scarce, but their calcium salts are abundant.
• Oligosaccharides, except for disaccharides and cyclodextrins, are sparsely documented.
• Hydrogen bonding is prevalent, involving hydroxyl groups and ring/glycosidic oxygens, forming chains and networks.
• Long-chain alkylated carbohydrates exhibit liquid crystalline properties and act as non-ionic surfactants.

Conclusions:

• Crystallographic data provides valuable insights into carbohydrate structure, conformation, and intermolecular interactions.
• Carbohydrate crystal structures reveal fundamental principles governing their assembly and properties.
• Applications of carbohydrate-derived materials include liquid crystals and surfactants for membrane protein studies.