The Thermodynamics of Gelatin/Fe2S3 Bionanocomposites Formation and Gelatin Conformational Change

doi:10.7517/j.issn.1674-0475.2014.06.505

Abstract

Abstract:

The gelatin/Fe₂S₃ bionanocomposite was synthesized via a facile one-pot chemical route at pH=7.40. The SEM image showed that the shapes of the bionanocomposites were rod-like. Based on the relationship between the absorbance data of system and the concentration of Fe₂S₃, the Benesi Hildebrand equation was used to calculate the formation constants K(293 K: 14.47 10²L·mol^-1; 297 K: 9.24 10²L·mol^-1; 309 K: 1.70 10²L·mol^-1) at three different temperatures. Thermodynamic parameters were also determined (Δ_rG_m=-17.88/-16.68/-13.09 kJ·mol^-1; Δ_rH_m=-105.57 kJ·mol^-1; Δ_rS_m=-299.28 J·K^-1·mol^-1). The results indicated the formation process was spontaneous, exothermic and enthalpy-driven. FT-IR data indicated that the amide linkage in gelatin polypeptide chain can be especially active sites for the nucleation and growth of Fe₂S₃. The effect of Fe³⁺ and Fe₂S₃ on the conformations of gelatin macromolecule had also been analyzed by means of UV-vis and FT-IR spectra. The results showed that there was less α-helix content and more β-sheet structures due to integration of them. By integrating the information of the UV-vis and FT-IR analyses of the synthesized samples, a most plausible formation mechanism of the gelatin/Fe₂S₃ bionanocomposites was given: Fe³⁺ coordinated with amide linkage in gelatin macromolecule to form gelatin/Fe³⁺ complex, then S^2- combined with Fe³⁺cooperated by gelatin to form gelatin/Fe₂S₃.

Key words: gelatin/Fe₂S₃ bionanocomposite, gelatin, thermodynamic parameter, conformation change

WANG Baiyang, XIAO Xinguang, TANG Shihua, LIU Cen. The Thermodynamics of Gelatin/Fe₂S₃ Bionanocomposites Formation and Gelatin Conformational Change[J]. Imaging Science and Photochemistry, 2014, 32(6): 505-513.

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The Thermodynamics of Gelatin/Fe₂S₃ Bionanocomposites Formation and Gelatin Conformational Change

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