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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 (http://creativecommons.org/licenses/by/4.0/).
ATR-FTIR spectra of electrosprayed capsules. From bottom to top: pure β-carotene crystals, ChCl:butanediol (DES4), pure WPC, and WPC + 10% DES4 + β-carotene capsules. The arrows point to the spectral band related to the presence of ChCl:butanediol (DES4).