A refillable fragrance carrier with a tuneable thermal switch

• Published in: Flavour and fragrance journal Vol. 27; no. 5; pp. 386 - 392
• Main Authors: Seemork, Jiraporn, Tree-Udom, Thapakorn, Wanichwecharungruang, Supason
• Format: Journal Article
• Language: English
• Published: Chichester Blackwell Publishing Ltd 01.09.2012; Wiley
• Subjects: aggregation; Applied sciences; Chemical industry and chemicals; chitosan; controlled release; Essential oils, perfumes; Exact sciences and technology; fragrance; thermal switch; Washing products. Cosmetics and toiletries. Perfumes; thermal switch; Terpenoid; Thermosensible polymer; Flavoring agent; Controlled release form; Perfume; aggregation; Aldehyde; Zinc Sulfates; Surface structure; Aldehydophenols; Ethylene oxide polymer; fragrance; controlled release; Transmission electron microscopy; Morphology; Monoterpene; Chitosan; Vanillin; Citral; Polysaccharide; Aqueous dispersion; Modified material
• ISSN: 0882-5734; 1099-1026
• DOI: 10.1002/ffj.3116

ABSTRACT Release of fragrant molecules from poly(ethylene oxide) (PEO) grafted chitosan particles could be controlled in a switchable manner through the thermo‐responsive hydration/dehydration of the PEO corona of the spheres that resulted in the de‐aggregation/aggregation among particles and corresponded to an on/off fragrant release switch. In water, mPEO–chitosan self‐assembled into spherical particles with the mPEO corona covering the surface and vanillin and citral could be loaded into the particles. The mPEO–water interaction took place at temperatures lower than the lower critical solution temperature (LCST) value and resulted in de‐aggregation among spheres which enabled release of the loaded fragrance molecules, whilst mPEO–mPEO interactions occurred at temperatures higher than the LCST value and resulted in aggregation among spheres which also halted the fragrance release. This thermal switch could be tuned to a desired temperature by adjusting the salt concentration. After the release of all fragrances, the thermo‐responsive carriers could be refilled again. Copyright © 2012 John Wiley & Sons, Ltd. Release of fragrant molecules from poly(ethylene oxide) (PEO) grafted chitosan particles could be controlled in a switchable manner through the thermo‐responsive de‐aggregation/aggregation among particles and corresponded to an on/off fragrant release switch. This thermal switch could be tuned to a desired temperature by adjusting the salt concentration. After release of all fragrances, the thermo‐responsive carriers could be refilled again.