A simple and accessible synthetic lectin for glucose recognition and sensing

Area of Science:

• Carbohydrate Chemistry
• Supramolecular Chemistry
• Sensing Technology

Background:

• Binding carbohydrates from aqueous solutions is challenging, even for natural lectins.
• Designing synthetic lectin mimics with high selectivity is complex and often requires lengthy, low-yield syntheses.
• Previous synthetic glucose-selective systems were complex polycyclic architectures with low overall yields (e.g., 21 steps, 0.1% yield).

Purpose of the Study:

• To discover a simple, accessible synthetic host molecule that mimics lectin function for carbohydrate binding.
• To develop a synthetic lectin with high selectivity for glucose over other monosaccharides.
• To create a glucose-sensing system with a built-in signaling mechanism.

Main Methods:

• Synthesis of a novel monocyclic host molecule.
• Evaluation of the host's binding affinity and selectivity for glucose against other monosaccharides.
• Characterization of the host's fluorescence properties upon guest binding.

Main Results:

• A simple monocyclic host was synthesized in a highly accessible five-step procedure with a 23% overall yield.
• The synthetic lectin demonstrated excellent selectivity for glucose over other common monosaccharides (e.g., ~50:1 versus galactose).
• The host exhibits strong, guest-dependent fluorescence emission, enabling a built-in signaling system.

Conclusions:

• A simple and highly accessible monocyclic synthetic lectin has been developed.
• This new molecule exhibits high glucose selectivity and affinity suitable for sensing glucose concentrations in blood.
• The built-in fluorescence signaling mechanism suggests potential for practical glucose monitoring applications.