Design of Stimuli-Responsive Dynamic Covalent Delivery Systems for Volatile Compounds (Part 2): Fragrance-Releasing...

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Fragrance Chemistry

Background:

• Surfactants are crucial in perfumery for solubilizing and controlling fragrance release.
• Traditional surfactants may not offer controlled or triggered fragrance delivery.
• Profragrances offer a route to covalently link fragrance molecules for delayed or triggered release.

Purpose of the Study:

• To synthesize and characterize amphiphilic imine surfactants as cleavable profragrances.
• To investigate the self-assembly behavior and fragrance solubilization capabilities of these surfactants.
• To evaluate the fragrance release profile and performance under application conditions.

Main Methods:

• Synthesis of amphiphilic imines via condensation reactions.
• Micelle formation and solubilization studies in aqueous media.
• Dynamic headspace analysis for fragrance evaporation assessment.
• Hydrolysis studies to determine fragrance release kinetics.

Main Results:

• Amphiphilic imines formed micelles capable of solubilizing non-covalently attached perfume molecules.
• Solubilized fragrances evaporated similarly to controls with non-cleavable surfactants.
• Cleavable imine surfactants hydrolyzed under application conditions, releasing fragrance aldehydes.
• Profragrances demonstrated stability in storage and a blooming effect upon dilution.
• A balanced perfume performance was achieved by modulating the evaporation of volatile and less volatile fragrances.

Conclusions:

• Amphiphilic imine surfactants function effectively as cleavable profragrances in perfumery.
• These profragrances enable controlled fragrance release and enhance perfume longevity and balance.
• The developed system offers a promising approach for advanced functional perfumery applications.