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. 2017 Aug 23;18(9):1829. doi: 10.3390/ijms18091829

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© 2017 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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Morphological and physico-chemical characterization of AMs (A–D) and FAMs (E–H). Scanning electron microscope (SEM) images: AMs smooth surface (A,B) and FAMs rough surface (E,F); energy dispersive X-ray (EDX) spectra: fibroin nitrogen peak in FAMs spectrum (G), and absence of the fibroin nitrogen peak in AMs spectrum (C); Fourier transform infrared spectroscopy (FTIR) spectra: (D) AMs calcium alginate peak stretching vibrations of O–H bonds in the range 3000–3600 cm⁻¹, stretching vibrations of aliphatic C–H at ~2900 cm⁻¹ and asymmetric stretching vibration of the carboxylate group at ~1600 cm⁻¹ (D); (H) absorption bands of FAMs fibroin crystalline β-sheets conformation at ~1620 cm⁻¹ for Amide I and ~1520 cm⁻¹ for Amide II.

Morphological and physico-chemical characterization of AMs (A–D) and FAMs (E–H). Scanning electron microscope (SEM) images: AMs smooth surface (A,B) and FAMs rough surface (E,F); energy dispersive X-ray (EDX) spectra: fibroin nitrogen peak in FAMs spectrum (G), and absence of the fibroin nitrogen peak in AMs spectrum (C); Fourier transform infrared spectroscopy (FTIR) spectra: (D) AMs calcium alginate peak stretching vibrations of O–H bonds in the range 3000–3600 cm⁻¹, stretching vibrations of aliphatic C–H at ~2900 cm⁻¹ and asymmetric stretching vibration of the carboxylate group at ~1600 cm⁻¹ (D); (H) absorption bands of FAMs fibroin crystalline β-sheets conformation at ~1620 cm⁻¹ for Amide I and ~1520 cm⁻¹ for Amide II.