Encapsulation and controlled release of fragrances from functionalized porous metal–organic frameworks

Abstract

In the fragrance and perfume industry, the encapsulation and controlled release of fragrance is important to appeal to consumers and promote the quality of products. Here, we demonstrate that porous metal–organic frameworks (MOFs) can effectively encapsulate and release fragrant molecules in a controlled manner. The incorporation of functional groups into MOFs can improve the adsorption and release behavior of fragrant molecules. We find that polar ester‐type fragrances exhibit higher adsorption on polar hydroxyl‐functionalized MOF [UiO‐66‐(OH)2] than on nonpolar MOF (UiO‐66), while nonpolar terpenoid‐type fragrances show no adsorption difference between these two MOFs. The release profiles show that UiO‐66‐(OH)2 can prolong the release of polar fragrances compared with nonpolar fragrances. Both the experimental results and computer molecular modeling demonstrate that the hydroxyl groups in UiO‐66‐(OH)2 can form strong hydrogen binding with different ester fragrances. The releasing kinetics indicates that pore diffusion is the rate‐limiting step of fragrance release from MOFs. © 2018 American Institute of Chemical Engineers AIChE J, 65: 491–499, 2019

A novel photothermo-responsive nanocarrier for the controlled release of low-volatile fragrances

“…Over the last decade, the development of avor and fragrance nanocapsules has drawn extensive attention in academia and industry. [9][10][11][12][13] In this regard, porous silica-based materials are particularly attractive as a matrix for encapsulation of fragrant molecules, [14][15][16][17][18][19] because they offer inherent advantages over the commonly used polymers, such as high mechanical resistance, excellent biocompatibility, and great loading capacity. 14 For example, Zhu et al employed mesoporous silica nanoparticles (MSNs) modied with polyelectrolytes to enclose hydrophilic perfume, which improved the loading content of fragrance and long-lasting effects.…”

“…Moreover, the PDA coating may afford the nanoparticles favorable affinity responsible for compatibility with the other ingredients of household/personal care products. Despite signicant interest in the stimuli-responsive fragrance release systems, [11][12][13] photothermally sensitive materials as delivery vehicles for fragrances have not previously been explored to the best of our knowledge.…”

Effect of mesoporous silica nanoparticles‐based nano‐fragrance on the central nervous system

“…Mesoporous materials have a large specific surface area, pore volume, and tunable pore size, so they have a large surface tension, which can adsorb most fragrance molecules [17‐19]. For example, Zhou and his colleagues designed porous metal–organic frameworks to encapsulated fragrances [20,21]. In addition, mesoporous materials, such as mesoporous silica nanoparticles, are easy to prepare and have low production costs.…”

Chitosan‐based nanofragrance with antibacterial function applied to wallpaper

“…reported two kinds of metal‐organic frameworks for encapsulation of fragrance and long‐term sustained release of fragrances. [9,10]…”