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Published on: October 13, 2021
Determination of the shell permeability of microcapsules with a core of oil-based active ingredient
Ruben Mercadé-Prieto1, Rachael Allen, David York
1School of Chemical Engineering, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.
Abstract:
An experimental and theoretical methodology is proposed to calculate the permeability of microcapsules that contain a core of oil-based active ingredient. Theoretical analysis is performed considering the polydispersity of the measurable capsule size, which allows the estimation of the permeability polydispersity via three different methods. The models proposed were applied in order to determine the permeability of melamine-formaldehyde microcapsules with hexyl salicylate as core oil. Release experiments were performed with four different co-solvents (ethanol, propan-1-ol, propan-2-ol and 1,3-butanediol) of different concentration. Permeability values were found to be constant, despite a two order magnitude of difference in the solubility concentrations.
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