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. 2019 Dec 14;11(12):2102. doi: 10.3390/polym11122102

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© 2019 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 (FTIR) spectra of silk fibroin (SF), reduced glutathione (GSH)-SF, and samples from 500 cm⁻¹ to 700 cm⁻¹ (a) and from 1600 cm⁻¹ to 1650 cm⁻¹ (b) i. SF, ii. GSH-SF, iii. sample after 30 s UV illumination, iv. sample after 1 min UV illumination, v. sample after 2 min UV illumination, vi. sample after 3 min UV illumination.