Perfume microencapsulation

Core/wall ratio cannot only decide the wall thickness of a microcapsule but also the effectiveness of the microencapsulation." The work" on the microencapsulation of xylitol by poly (urethane-urea), which was performed in a water-in-oil system, indicates that the most proper core/wall ratio is 77/23 in terms of high encapsulation yield and xylitol loading content. Another work on the microencapsulation of perfume by polyurea, which was performed in a oil-in-water system, found that with the decrease of the core/wall ratio, the size of the formed microcapsule increased even the original droplet size is roughly the same. An outward diffusion mechanism was proposed to explain... 

Further progress can be easily envisaged. For example, attempts to create perfumes based on suspended capsules go back to the early 1970s. Now formulation in water of sol-gel-entrapped perfumes of tunable scent to avoid skin irritation becomes possible. Stabilized natural fragrances replacing toxic synthetic musks are also forecasted herein. In particular, sol-gel microencapsulated essential oils will replace nonbiodegradable musks as a consequence of the chemical and physical stabilization of nice fragrances that thus far could not be widely commercialized due to weU-known poor chemical stability. 

Microcapsules with permeable walls enable prolonged release of the active components into the environment, such as in the case of prolonged release drugs, perfumes, deodorants, repellents, etc., or immobilization with locally limited activity of micro-encapsulated substances. Examples of the latter include microencapsulated fertilizers and pesticides with locally limited release to reduce leaching into the ground water, or microencapsulated catalysts and enzymes for chemical and biotechnological processes. 

Numerous high touch fibers have been produced and commercialized (primarily in Japan) for luxury apparel. Conceptually, the geometry and fineness of the fibers are carefully modified and controlled to produce fabrics with desirable sensual responses of touch, sight, sound, comfort, and even odor (78,93). There are several techniques for producing ultrafine fibers and this has led to the production and commercialization of materials such as Ultrasuede, artificial leather and silk, fabrics with a peach-fuzz sensation, perfumed hosiery, fabrics that change color due to microencapsulation of cholesteric liquid crystals, and numerous other luxury and novelty textile products. 

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