Dissolution and interaction of white hide powder in [Etmim][C12H25SO4]

Ethytchloroacetate, 1-methylimidazole and sodium dodecyl sulfate as raw materials, ester-functionalized surface active ionic liquid 3-methyl-(ethoxycarbonylmethyl)-imidazolium dodecylsulfate ([Etmim][C12H25SO4]) was synthesized for white hide powder dissolution. The structure of [Etmimj[C12H25SO4] was ascertained by H-1 NMR The solubility of white hide powder in [Etmim][C12H25SO4] was measured from 60 degrees C to 140 degrees C with 20 degrees C interval. Compared to [Etmim]Cl, [Etmim][C12H25SO4] was superior to dissolve white hide powder. The physicochemical performances of white hide powder/[Etmim][C12H25SO4] was measured by tensiometry, electrical conductivity and fluorimetry. The tensiometry results showed that the cmc of [Etmim][C12H25SO4] was 1.41 mmol/L at 298.15 K, indicating that [Etmim][C12H25SO4] exhibited higher surface activity than traditional anionic surfactants. The regenerated white hide powder was characterized by FF-IR, TGA, DSC, and XRD. Thermodynamics profiles demonstrated that the secondary structure of white hide powder was slightly destroyed during dissolution. The interaction mechanism between white hide powder and [Etmim][C12H25SO4] was studied by DFT computation using triple peptide Gly-Pro-Hyp (as GPHyp) as model. Seven hydrogen bonds were found between GPHyp and [Etmim][C12H25SO4]. The simulation results suggested that the formation of hydrogen bonds accelerated the dissolution of white hide powder in [Etmitn][C12H25SO4]. (C) 2017 Elsevier B.V. All rights reserved.