Novel Clickable Alkyne-Terminated Sulfonamide Cyclodextrins with Extended Hydrophobic Cavity
Technology Summary
Dr. Thomas K. Green has developed a novel class of water-soluble, single-isomer, alkyne-modified sulfonamide cyclodextrins (CDs), specifically m-polyethylene glycol (PEG)-triazole-sulfonamide-β-CD, created using the clickable chemistry derivatization technique, copper-catalyzed azide-alkyne cycloaddition (CuAAC). This new CD derivative has an extended hydrophobic cavity, significantly enhancing its ability to bind and encapsulate small hydrophobic substrates.
Background
Cyclodextrins (CDs) are a family of cyclic oligosaccharides consisting of ring-shaped glucose subunits joined by α-1,4 glycosidic bonds. CDs are produced from starch using an enzymatic conversion process with cyclodextrin glycosyltransferase. They have a hydrophilic exterior and an internal hydrophobic cavity, enabling them to encapsulate other molecules. This unique structure allows CDs to be used in a variety of applications, including pharmaceuticals, food additives, and cosmetics. However, existing CDs have limitations in binding and encapsulating small hydrophobic substrates effectively.
Description
This innovation solves the limitations of native cyclodextrins by introducing an extended hydrophobic cavity via copper-catalyzed azide-alkyne cycloaddition (CuAAC) click chemistry. The resulting single-isomer, alkyne-modified sulfonamide cyclodextrin retains high water solubility while dramatically improving encapsulation efficiency for small hydrophobic guest molecules across multiple industries.
Applications
- Pharmaceuticals: Drug delivery systems for poorly water-soluble drugs.
- Food & Beverages: Encapsulation and stabilization of flavors and additives.
- Cosmetics: Enhanced encapsulation and targeted delivery of active ingredients.
- Textiles: Odor trapping and sustained, time-release delivery of fragrances.