Cork ‐ a natural material for linalool controlled release

Abstract

Controlled release of aromatic mixtures to the atmosphere is a requirement for scented systems for indoor applications. The product must smell nice, but also be able to last, slowly releasing the perfume over time. Several adsorption materials have been used, for this purpose. In this study, cork was investigated as a potential perfume adsorbent for application in scented drawer sachets and equivalent products. Cork was selected due to its adsorption properties and because it is a natural, renewable, sustainable material. Granulated cork is a significant by‐product in cork industries and it was chosen for adsorption in this work. Linalool, an enantiomeric monoterpene alcohol and one of the main components of several essential oils, was selected as the model compound for adsorption studies. Activated carbon (AC) was used as the reference material. The sorption of linalool to granulated cork and AC was evaluated by HS‐SPME‐GC‐FID. The linalool isotherm on cork was shown to follow a Brunauer‐Deming‐Deming and Teller, Type IV model. The isotherm data on AC can be adjusted to Langmuir and Freundlich models. A maximum adsorption capacity of 3.9x103μg/g was achieved for AC. Desorption studies were performed. Linalool was still released from granulated cork after three equilibrium stages of desorption, whereas only two desorption values were obtained for AC from the equilibrium with highest linalool concentration. Thus, AC demonstrated good adsorption but not good desorption properties. Sorption and desorption studies of linalool from granulated cork, showed that granulated cork could be an excellent material allowing controlled release of the aroma.

Release of Fragrances from Polymer Coatings Triggered by Contact with Sweat

“…A first approach for storing fragrances in materials is to entrap them in nano- or microcapsules of polymers − or silica nanocapsules. , However, fragrances are diffusing rapidly through these carriers, with typically ∼30–50% − of fragrance released after 1 week. Another approach for retarding and controlling the release of fragrance is to link the fragrance molecule to macromolecules via light-, , enzyme-, ,, and acid-labile linkages. − Activation by light can potentially cause the premature degradation the fragrance from the polymer or an unwanted release .…”