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. 2020 Jul 24;9(8):443. doi: 10.3390/antibiotics9080443

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© 2020 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 (http://creativecommons.org/licenses/by/4.0/).

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Fourier-Transform Infrared Spectroscopy (FTIR) spectra of the bilayer control film (a) zein layer, (b) pullulan layer; and bilayer film with licorice essential oil (c) zein layer, (d) pullulan layer.3.2. Microstructure of Bilayer Films.