Remarkable preference for di-substitution in self-assembled glycolipids

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Biophysics

Background:

• Lipids are amphitropic molecules forming liquid crystal mesophases between solid and liquid states.
• Naturally occurring lipids self-assemble into structures like micelles and cell membranes.
• Lipid structure, particularly chain number, influences self-organization into lamellar or columnar phases.

Purpose of the Study:

• Investigate the stability of lamellar liquid crystal phases based on the number of aliphatic chains.
• Synthesize novel glycolipids using click chemistry with triazoles linking chains to sugar scaffolds.
• Explore the relationship between molecular architecture and self-assembled phase behavior.

Main Methods:

• Synthesis of new glycolipids with one, two, or three aliphatic chains.
• Characterization using optical microscopy, differential scanning calorimetry, and X-ray diffraction.
• Computational studies including Density Functional Theory (DFT) and molecular dynamics simulations.

Main Results:

• The two-chain glycolipid derived from trehalose exhibited a more ordered lamellar phase compared to one- or three-chain analogs.
• DFT calculations provided insights into the optimized structures and molecular shapes.
• Molecular dynamics simulations revealed distinct folded and extended molecular architectures in stable lamellar phases.

Conclusions:

• The number of aliphatic chains significantly impacts the stability and order of glycolipid lamellar phases.
• Two-chain glycolipids demonstrate enhanced stability, suggesting potential for controlled self-assembly.
• This study provides a molecular-level understanding of lipid self-assembly and phase behavior.