title: Functional dependency of structures of ionic liquids: do substituents govern the selectivity of enzymatic glycerolysis?
abstract: The concept of regulating the preference of a reversible multi-step reaction by adjusting the substituents of ionic liquids (ILs) has been successfully exemplified with a group of tetraammonium-based ionic liquids as medium for the enzymatic glycerolysis. Simultaneous existence of long chain hydrophobic substituents and hydrophilic ethoxyl or hydroxyl moieties is found, respectively, to be essential for triglycerides (TG) dissolving and equilibrium shifting. The reactions in the ILs with cations consisting of long chain and free hydroxyl groups gave markedly higher conversion of TG and better preference to monoglyceride formation. Interestingly the predicted results from COSMO-RS (a quantum chemical model programme) achieved a good agreement with the experimental data, mapping out the specific solvation from the ILs as well as demonstrating the interaction between ILs, substrates and products being the intrinsic causes that govern reaction evolution and direct equilibrium shifting.
authors.affiliation: BioCentrum-DTU, Technical University of Denmark, Building 221, DK-2800, Lyngby, Denmark.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Guo
authors.forename: Biqiang
authors.initials: B
authors.lastname: Chen
authors.forename: Rafael
authors.initials: R
authors.lastname: López Murillo
authors.forename: Tianwei
authors.initials: T
authors.lastname: Tan
authors.forename: Xuebing
authors.initials: X
authors.lastname: Xu
mesh_terms: D005990:Glycerol / Q000737:chemistry* / Q000378:metabolism; D006868:Hydrolysis; D007477:Ions; D008049:Lipase / Q000737:chemistry* / Q000378:metabolism; D015394:Molecular Structure; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D007477:Ions; D000644:Quaternary Ammonium Compounds; D012997:Solvents; D008049:Lipase; D005990:Glycerol