Porous Coatings to Control Release Rates of Essential Oils to Generate an Atmosphere with Botanical Actives

Essential oils have been used in diverse areas such as packaging, agriculture and cosmetics, for their antimicrobial and pesticide activity. The organic volatile compounds of the essential oils are involved in its activity. Controlling their release helps to prolong their functionality. In this stud...

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Bibliographic Details
Published in:Materials 2022-03, Vol.15 (6), p.2155
Main Authors: Hettmann, Kai, Monnard, Fabien W, Melo Rodriguez, Gabriela, Hilty, Florentine M, Yildirim, Selçuk, Schoelkopf, Joachim
Format: Article
Language:English
Subjects:
Antiinfectives and antibacterials
Antimicrobial agents
Calcium carbonate
Capillarity
Coating effects
Confined spaces
Cosmetics
Desorption
Electric motors
Essential oils
Experiments
Mass spectrometry
Oils & fats
Pesticides
Rosemary
Scientific imaging
Thyme
Volatile compounds
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Summary:Essential oils have been used in diverse areas such as packaging, agriculture and cosmetics, for their antimicrobial and pesticide activity. The organic volatile compounds of the essential oils are involved in its activity. Controlling their release helps to prolong their functionality. In this study, a functionalized calcium carbonate porous coating was employed to control the release of thyme and rosemary oil in a confined space. The release rate was evaluated at 7 °C and 23 °C, gravimetrically. It was shown that the capillary effect of the porous coating slowed down the release of the volatiles into the headspace compared to the bulk essential oil. A linear drive force model was used to fit the obtained data from both essential oils. The model showed that rosemary reached the asymptotic mass loss equilibrium faster than thyme. This result can be explained by the diverse composition and concentration of monoterpenoids between the two essential oils. Temperature and degree of loading also played important roles in the desorption of the essential oils. It was observed that at high degrees of loading and temperatures the desorption of essential oils was higher. The above-described technology could be used for applications related to food preservation, pest control among others.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15062155