title: Lysozyme Solubility and Conformation in Neat Ionic Liquids and Their Mixtures with Water.
abstract: The room temperature solubility of a number of model proteins is assessed for a diverse set of neat ionic liquids (ILs). For two soluble protein-IL pairs, lysozyme in [C2MIM][EtSO4] (1-ethyl-3-methylimidazolium ethylsulfate) and in [C2,4,4,4P][Et2PO4] (tributyl(ethyl)phosphonium diethylphosphate), protein solubility and structure at various temperatures are probed by dynamic light scattering (assessing dissolved molecular size), turbidimetry (reflecting degree of solubility), and Fourier transform infrared spectroscopy (uncovering helical secondary structure). As compared to aqueous environments, [C2,4,4,4P][Et2PO4] thermally stabilizes protein size and secondary structure while [C2MIM][EtSO4] does the opposite. Lysozyme denatured in [C2MIM][EtSO4] does not aggregate, presumably due to an absence of hydrophobic interactions, and the denaturation appears thermally reversible. Both ILs at room temperature are miscible with water in all proportions, but to create the corresponding ternary mixtures with protein, the order of mixing is important. Mixed to avoid additions of water to IL-dissolved protein, stable solutions are obtained with [C2MIM][EtSO4] at all solvent compositions. When water is added to IL-rich solutions, liquid-liquid demixing is noted.
authors.affiliation: Polymer Science and Engineering Department, University of Massachusetts-Amherst , Amherst, Massachusetts 01003, United States.
authors.forename: Stephen
authors.initials: S
authors.lastname: Strassburg
authors.affiliation: Polymer Science and Engineering Department, University of Massachusetts-Amherst , Amherst, Massachusetts 01003, United States.
authors.forename: Harry
authors.initials: H
authors.lastname: Bermudez
authors.affiliation: Polymer Science and Engineering Department, University of Massachusetts-Amherst , Amherst, Massachusetts 01003, United States.
authors.forename: David
authors.initials: D
authors.lastname: Hoagland
mesh_terms: D000818:Animals; D002645:Chickens; D052578:Ionic Liquids / Q000737:chemistry*; D009113:Muramidase / Q000737:chemistry* / Q000378:metabolism; D017433:Protein Structure, Secondary; D012995:Solubility; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014867:Water / Q000737:chemistry*
chemical_list: D052578:Ionic Liquids; D014867:Water; C421864:hen egg lysozyme; D009113:Muramidase