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. 2021 Dec 17;13(24):4431. doi: 10.3390/polym13244431

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© 2021 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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(a) Attenuated total reflection–Fourier transform infrared (ATR–FT-IR) spectra of starch-chitosan films. (b) Amplified region between 1200 cm⁻¹ an 900 cm⁻¹; this relates the values of R_1047/1022 and R_995/1022 of starch-chitosan films.