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. 2022 Apr 21;14(5):909. doi: 10.3390/pharmaceutics14050909

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© 2022 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Capsule recrystallization in a medium. Panels (a,b) represent a scheme of the release mechanism and the corresponding container two-photon microscope fluorescence images with scanning electron microscopy (SEM) images as insets. (a) The carriers are in a pure vaterite phase with all dye encapsulated; panel (b) shows the calcite phase, where the dye was released into the medium apart from residuals attached to the crystal surfaces. Panel (c) displays dye release curves for different payloads measured by spectrofluorometry during the immersion in water and in ethanol. Panels (a–c) are reproduced with permission from [70], the Royal Society of Chemistry, 2013; panel (d) schematics of the degradation of particles due to pH changes. Reproduced with permission from [73], Elsevier, 2013. Panel (e) depicts release of the perphenazine. Reproduced with permission from [74], Elsevier, 2021.