Cavitand boronic acids mediate highly selective fructose transport

Area of Science:

• Supramolecular Chemistry
• Biomimetic Materials

Background:

• Developing artificial systems for selective molecule transport across membranes is crucial for understanding biological processes and creating new technologies.
• Boronic acids are known to interact with saccharides, but their application in artificial transport systems has faced limitations.

Purpose of the Study:

• To synthesize and characterize a new family of cavitand rim-appended boronic acids.
• To evaluate their efficacy as artificial transporters for sugars, focusing on selectivity and transport rates.
• To assess their stability within lipophilic membrane environments.

Main Methods:

• Synthesis of five distinct cavitand rim-appended boronic acid derivatives.
• Incorporation of these compounds into lipophilic membranes.
• Measurement of sugar transport kinetics, specifically fructose and glucose.
• Determination of selectivity and flux rates compared to existing neutral boronic acids.

Main Results:

• The synthesized cavitand boronic acids demonstrated excellent conformational rigidity and stability, showing no observable leaching from lipophilic membranes.
• These compounds exhibited unprecedented selectivity for fructose transport over glucose.
• The artificial transporters achieved higher sugar flux rates compared to other neutral boronic acids.

Conclusions:

• Cavitand rim-appended boronic acids represent a highly effective class of artificial transporters for saccharides.
• Their unique structural features contribute to enhanced stability and superior fructose transport selectivity.
• These findings position cavitand boronic acids as the most promising artificial fructose transporters reported to date.