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. 2015 Sep 16;6(3):946–962. doi: 10.3390/jfb6030946

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© 2015 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 license (http://creativecommons.org/licenses/by/4.0/).

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FTIR-ATR spectra of membranes. (A) (in the range of 1800–950 cm⁻¹): (A1) fibroin membrane (water annealed at 25 °C, 6 h), (A2) fibroin membrane (water annealed at 60 °C, 12 h), (A3) blend membrane (fibroin:tropoelastin = 90:10), (A4) three-layered membrane—side 1, (A5) three-layered membrane—side 2, (A6) tropoelastin membrane (untreated); and (B) (in the range of 1300–1100 cm⁻¹): (B1) two-layered membrane (untreated)—fibroin side, (B2) two-layered membrane (untreated)—tropoelastin side, (B3) two-layered membrane (methanol treated)—fibroin side, (B4) two-layered membrane (methanol treated)—tropoelastin side, (B5) tropoelastin membrane (untreated).