Preparation and characterization of ethylcellulose-based microcapsules for sustaining release of a model fragrance

Abstract

A model fragrance, vanillin, was encapsulated into ethylcellulose using an oil-in-water solvent evaporation method to prepare biodegradable microcapsules that can sustain the release of the model agent and potentially be bound to textile material. This study examined the effect of vanillin and polymer concentrations on the encapsulation efficiency, vanillin content and size of microcapsules. Microcapsules were dip-coated by chitosan, and the coating was crosslinked with non-toxic 1,2,3,4-butanetetracarboxylic acid. The release of vanillin from the uncoated and coated capsules was examined in air at elevated temperature. The experiments showed that ethylcellulose could efficiently sustain the delivery of vanillin, and additional chitosan layer increased the release of the model fragrance.

Preparation and characteristics of nanocapsules containing essential oil for textile application

“…It has been proved that the aroma perception is maintained for several days in fabrics if fabrics impregnated with capsules containing perfume and the capsules continue to emit aroma for up to five wash cycles. [11][12][13] Fragrance encapsulated in small particles (nanometer range) and narrow dispersion are preferred for use in textiles as they can provide a strong adhesive force and interact with the fibre due to their large surface area. [14] Furthermore, the smaller the capsules the greater the covering of the product and the longer the fragrance will last because it takes longer for the capsules to be ruptured by physical pressure.…”

Microencapsulation of n-hexadecane phase change material by ethyl cellulose polymer

“…Furthermore, in our previous studies PVA was found to be a very effective surfactant for emulsifying EC containing organic droplets in the aqueous phase [12][13][14]. Nevertheless, we also examined the usability of other emulsifiers, such as Tween 80, polyvinylpirrolidone and poloxamer (Pluronic F68) beside PMAA.…”

“…The results were processed by using the thermoanalyzer's Calisto Processing (v1. 12) software. The corresponding melting/freezing enthalpies, and onset temperatures were determined by the baseline integration method (Tangential sigmoid baseline type).…”

“…Torza and Mason [9] described the equilibrium morphology of forming drops as a function of interfacial tensions in the presence of three immiscible liquids. Briefly, if droplets of immiscible liquids (phases 1 and 3) are brought in contact with a third mutually immiscible liquid (phase 2), the final equilibrium morphology can be deduced by determining the various interfacial tensions between the phases (γ 12 , γ 23 , and γ 13 ). The spreading coefficients S i for each phase can be defined as S i = γ jk − (γ ij +γ ik ) (1) and designating phase 1 to be that for which γ 12 > γ 23 , then S 1 < 0.…”

Vanillin release from poly(vinyl alcohol)-bacterial cellulose mono and multilayer films

“…It is often used as food preservative (Rakchoy et al, 2009), constituent in cosmetics and drug preparations (Hossain, 2011), textile fragrance (Peña et al, 2012;Feczkó et al, 2010) and cross-linker (Peng et al, 2010).…”