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Jianji Wang - One of the best experts on this subject based on the ideXlab platform.

  • Choline Derivative ionic liquids based aqueous two phase systems phase diagrams and partition of purine alkaloids
    The Journal of Chemical Thermodynamics, 2018
    Co-Authors: Zhiyong Li, Huiyong Wang, Jianji Wang
    Abstract:

    • Liquid-liquid phase equilibrium data were reported for Choline Derivative ionic liquids + salts aqueous two-phase systems.

  • Choline Derivative ionic liquids-based aqueous two-phase systems: Phase diagrams and partition of purine alkaloids
    The Journal of Chemical Thermodynamics, 2018
    Co-Authors: Jiao Ren, Huiyong Wang, Jing Liu, Yuanchao Pei, Jianji Wang
    Abstract:

    Abstract Searching for environmentally friendly aqueous two-phase systems is imperative for the sustainable development of separation technologies. In this work, five kinds of environmentally benign Choline Derivative ionic liquids were synthesized and used for the formation of aqueous two-phase systems with K 3 PO 4 , K 3 C 6 H 5 O 7 or K 2 CO 3 . In order to understand the phase formation processes of these aqueous two-phase systems and their possible application in extraction, phase diagrams and partition coefficients of purine alkaloids were determined at T  = 298.2 K, and the effects of structure of the ionic liquids, nature of the purine alkaloids, composition and temperature of the systems on the partitioning behaviour of purine alkaloids were investigated systematically. It was shown that caffeine, theobromine and 2,6-amino purine could be extracted effectively into the ionic liquid-rich phase of the aqueous two-phase systems, and the partition coefficients were as high as 4.5–42 under the optimized conditions. The partitioning was found to decrease with the increase of the ratio of H 2 O weight fraction (in the ionic liquid-rich phase and in the salt-rich phase) and hydrophobicity of both the purine alkaloids and the ionic liquids, but not sensitive to the change of temperature.

  • Efficient separation of phenolic compounds from model oil by the formation of Choline Derivative-based deep eutectic solvents
    Separation and Purification Technology, 2016
    Co-Authors: Yue Zhang, Huiyong Wang, Xiaopeng Xuan, Jianji Wang
    Abstract:

    Abstract Phenolic compounds are an important class of compounds for organic chemical industry. In their traditional production processes, strong acid and base have to be used for the separation of phenolic compounds from oils, which often causes serious environmental problems. In this work, Choline Derivative salts [N 1,1, n C 2 OH]Cl ( n  = 1, 4, 6, 8) have been used as new extractants for the separation of 26 kinds of phenolic compounds from model oil (toluene) by forming deep eutectic solvents (DESs). It is found that only 16 kinds of phenolic compounds can be removed from toluene with single-step removal efficiency from 28.1% to 94.7%, strongly depending on the chemical structure of phenolic compounds. The nature, position and number of substituent groups in the phenolic compounds have a great effect on their removal efficiency. Far infrared spectroscopy and density functional theory calculations indicate that hydrogen bonds formed between –OH of the phenolic compounds and anion of the Choline Derivative salts is the main driving force for such DES-based separation. The correlation observed experimentally between structure of phenolic compounds and their removal efficiencies has been discussed from hydrogen bonding in DESs, electrostatic interaction of cation and anion of the Choline salts, and solvation of the phenolic compounds and Choline salts in the oil.

Huiyong Wang - One of the best experts on this subject based on the ideXlab platform.

  • Choline Derivative ionic liquids based aqueous two phase systems phase diagrams and partition of purine alkaloids
    The Journal of Chemical Thermodynamics, 2018
    Co-Authors: Zhiyong Li, Huiyong Wang, Jianji Wang
    Abstract:

    • Liquid-liquid phase equilibrium data were reported for Choline Derivative ionic liquids + salts aqueous two-phase systems.

  • Choline Derivative ionic liquids-based aqueous two-phase systems: Phase diagrams and partition of purine alkaloids
    The Journal of Chemical Thermodynamics, 2018
    Co-Authors: Jiao Ren, Huiyong Wang, Jing Liu, Yuanchao Pei, Jianji Wang
    Abstract:

    Abstract Searching for environmentally friendly aqueous two-phase systems is imperative for the sustainable development of separation technologies. In this work, five kinds of environmentally benign Choline Derivative ionic liquids were synthesized and used for the formation of aqueous two-phase systems with K 3 PO 4 , K 3 C 6 H 5 O 7 or K 2 CO 3 . In order to understand the phase formation processes of these aqueous two-phase systems and their possible application in extraction, phase diagrams and partition coefficients of purine alkaloids were determined at T  = 298.2 K, and the effects of structure of the ionic liquids, nature of the purine alkaloids, composition and temperature of the systems on the partitioning behaviour of purine alkaloids were investigated systematically. It was shown that caffeine, theobromine and 2,6-amino purine could be extracted effectively into the ionic liquid-rich phase of the aqueous two-phase systems, and the partition coefficients were as high as 4.5–42 under the optimized conditions. The partitioning was found to decrease with the increase of the ratio of H 2 O weight fraction (in the ionic liquid-rich phase and in the salt-rich phase) and hydrophobicity of both the purine alkaloids and the ionic liquids, but not sensitive to the change of temperature.

  • Efficient separation of phenolic compounds from model oil by the formation of Choline Derivative-based deep eutectic solvents
    Separation and Purification Technology, 2016
    Co-Authors: Yue Zhang, Huiyong Wang, Xiaopeng Xuan, Jianji Wang
    Abstract:

    Abstract Phenolic compounds are an important class of compounds for organic chemical industry. In their traditional production processes, strong acid and base have to be used for the separation of phenolic compounds from oils, which often causes serious environmental problems. In this work, Choline Derivative salts [N 1,1, n C 2 OH]Cl ( n  = 1, 4, 6, 8) have been used as new extractants for the separation of 26 kinds of phenolic compounds from model oil (toluene) by forming deep eutectic solvents (DESs). It is found that only 16 kinds of phenolic compounds can be removed from toluene with single-step removal efficiency from 28.1% to 94.7%, strongly depending on the chemical structure of phenolic compounds. The nature, position and number of substituent groups in the phenolic compounds have a great effect on their removal efficiency. Far infrared spectroscopy and density functional theory calculations indicate that hydrogen bonds formed between –OH of the phenolic compounds and anion of the Choline Derivative salts is the main driving force for such DES-based separation. The correlation observed experimentally between structure of phenolic compounds and their removal efficiencies has been discussed from hydrogen bonding in DESs, electrostatic interaction of cation and anion of the Choline salts, and solvation of the phenolic compounds and Choline salts in the oil.

Zhiyong Li - One of the best experts on this subject based on the ideXlab platform.

Jiao Ren - One of the best experts on this subject based on the ideXlab platform.

  • Choline Derivative ionic liquids-based aqueous two-phase systems: Phase diagrams and partition of purine alkaloids
    The Journal of Chemical Thermodynamics, 2018
    Co-Authors: Jiao Ren, Huiyong Wang, Jing Liu, Yuanchao Pei, Jianji Wang
    Abstract:

    Abstract Searching for environmentally friendly aqueous two-phase systems is imperative for the sustainable development of separation technologies. In this work, five kinds of environmentally benign Choline Derivative ionic liquids were synthesized and used for the formation of aqueous two-phase systems with K 3 PO 4 , K 3 C 6 H 5 O 7 or K 2 CO 3 . In order to understand the phase formation processes of these aqueous two-phase systems and their possible application in extraction, phase diagrams and partition coefficients of purine alkaloids were determined at T  = 298.2 K, and the effects of structure of the ionic liquids, nature of the purine alkaloids, composition and temperature of the systems on the partitioning behaviour of purine alkaloids were investigated systematically. It was shown that caffeine, theobromine and 2,6-amino purine could be extracted effectively into the ionic liquid-rich phase of the aqueous two-phase systems, and the partition coefficients were as high as 4.5–42 under the optimized conditions. The partitioning was found to decrease with the increase of the ratio of H 2 O weight fraction (in the ionic liquid-rich phase and in the salt-rich phase) and hydrophobicity of both the purine alkaloids and the ionic liquids, but not sensitive to the change of temperature.

Louis-s. Bouchard - One of the best experts on this subject based on the ideXlab platform.

  • More Than 12 % Polarization and 20 Minute Lifetime of 15 N in a Choline Derivative Utilizing Parahydrogen and a Rhodium Nanocatalyst in Water.
    Angewandte Chemie International Edition, 2018
    Co-Authors: Jeffrey Mccormick, Sergey Korchak, Salvatore Mamone, Yavuz N. Ertas, Zhiyu Liu, Luke Verlinsky, Shawn Wagner, Stefan Glöggler, Louis-s. Bouchard
    Abstract:

    Hyperpolarization techniques are key to extending the capabilities of MRI for the investigation of structural, functional and metabolic processes in vivo. Recent heterogeneous catalyst development has produced high polarization in water using parahydrogen with biologically relevant contrast agents. A heterogeneous ligand-stabilized Rh catalyst is introduced that is capable of achieving 15 N polarization of 12.2±2.7 % by hydrogenation of neurine into a Choline Derivative. This is the highest 15 N polarization of any parahydrogen method in water to date. Notably, this was performed using a deuterated quaternary amine with an exceptionally long spin-lattice relaxation time (T1 ) of 21.0±0.4 min. These results open the door to the possibility of 15 N in vivo imaging using nontoxic similar model systems because of the biocompatibility of the production media and the stability of the heterogeneous catalyst using parahydrogen-induced polarization (PHIP) as the hyperpolarization method.

  • more than 12 polarization and 20 minute lifetime of 15 n in a Choline Derivative utilizing parahydrogen and a rhodium nanocatalyst in water
    Angewandte Chemie, 2018
    Co-Authors: Jeffrey Mccormick, Sergey Korchak, Salvatore Mamone, Yavuz N. Ertas, Zhiyu Liu, Luke Verlinsky, Shawn Wagner, Stefan Glöggler, Louis-s. Bouchard
    Abstract:

    Hyperpolarization techniques are key to extending the capabilities of MRI for the investigation of structural, functional and metabolic processes in vivo. Recent heterogeneous catalyst development has produced high polarization in water using parahydrogen with biologically relevant contrast agents. A heterogeneous ligand-stabilized Rh catalyst is introduced that is capable of achieving 15 N polarization of 12.2±2.7 % by hydrogenation of neurine into a Choline Derivative. This is the highest 15 N polarization of any parahydrogen method in water to date. Notably, this was performed using a deuterated quaternary amine with an exceptionally long spin-lattice relaxation time (T1 ) of 21.0±0.4 min. These results open the door to the possibility of 15 N in vivo imaging using nontoxic similar model systems because of the biocompatibility of the production media and the stability of the heterogeneous catalyst using parahydrogen-induced polarization (PHIP) as the hyperpolarization method.