title: Computational solvent system screening for the separation of tocopherols with centrifugal partition chromatography using deep eutectic solvent-based biphasic systems.
abstract: Tocopherols are a class of molecules with vitamin E activity. Among those, α-tocopherol is the most important vitamin E source in the human diet. The purification of tocopherols involving biphasic liquid systems can be challenging since these vitamins are poorly soluble in water. Deep eutectic solvents (DES) can be used to form water-free biphasic systems and have already proven applicable for centrifugal partition chromatography separations. In this work, a computational solvent system screening was performed using the predictive thermodynamic model COSMO-RS. Liquid-liquid equilibria of solvent systems composed of alkanes, alcohols and DES, as well as partition coefficients of α-tocopherol, β-tocopherol, γ-tocopherol, and σ-tocopherol in these biphasic solvent systems were calculated. From the results the best suited biphasic solvent system, namely heptane/ethanol/choline chloride-1,4-butanediol, was chosen and a batch injection of a tocopherol mixture, mainly consisting of α- and γ-tocopherol, was performed using a centrifugal partition chromatography set up (SCPE 250-BIO). A separation factor of 1.74 was achieved for α- and γ-tocopherol.
authors.affiliation: Biothermodynamics, TUM School of Life and Food Sciences Weihenstephan, Technische Universität München, 85354 Freising, Germany.
authors.forename: Franziska
authors.initials: F
authors.lastname: Bezold
authors.affiliation: Biothermodynamics, TUM School of Life and Food Sciences Weihenstephan, Technische Universität München, 85354 Freising, Germany.
authors.forename: Maria E
authors.initials: ME
authors.lastname: Weinberger
authors.affiliation: Biothermodynamics, TUM School of Life and Food Sciences Weihenstephan, Technische Universität München, 85354 Freising, Germany. Electronic address: mirjana.minceva@tum.de.
authors.forename: Mirjana
authors.initials: M
authors.lastname: Minceva
mesh_terms: D002072:Butylene Glycols; D002498:Centrifugation; D002853:Chromatography, Liquid / Q000379:methods*; D012997:Solvents; D024505:Tocopherols / Q000032:analysis / Q000737:chemistry / Q000302:isolation & purification*; D014810:Vitamin E
chemical_list: D002072:Butylene Glycols; D012997:Solvents; D014810:Vitamin E; C039681:1,4-butanediol; D024505:Tocopherols
keywords: Biphasic solvent system screening; COSMO-RS; Centrifugal partition chromatography; Deep eutectic solvents; Tocopherols; Vitamin E