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deep eutectic solvent

Hui Wang, Xiaodi Ma, Qibin Cheng, Li Wang, Liwei Zhang
Deep eutectic solvents (DESs), promising green solvents, and ultrahigh pressure extraction (UPE) as an effective auxiliary extraction method, have attracted wide attention. In this study, DES was coupled with UPE to efficiently extract baicalin from Scutellaria baicalensis Georgi. First, choline chloride: lactic acid (ChCl-LA, molar ratio 1:1) was selected as the most appropriate DES by comparing the extraction yield of different DESs. Second, the extraction protocol was optimized by response surface methodology (RSM) considering the impacts of ChCl-LA concentration, extraction pressure, extraction time and liquid-solid ratio on the extraction yield...
December 7, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Jinxiao Dou, Yongqi Zhao, Fengkui Yin, Hua Li, Jianglong Yu
The selective absorption of NO in flue gas has been investigated using a series of deep eutectic solvents (DESs) as novel denitrifying agents. The EG-TBAB DESs used in this work are composed of a hydrogen donor ethylene glycol (EG) and a parent salt tetrabutylammonium bromide (TBAB). Effects of DES composition (EG:TBAB molar ratio), operation temperature, residence time, and O2 concentration in the flue gas on denitrification performances of EG-TBAB DESs have been investigated. The highest denitrification efficiency and capacity were achieved using EG to TBAB molar ratio of 50:1 at an operation temperature of 50 °C...
December 12, 2018: Environmental Science & Technology
Hongwei Ren, Xue Wang, Shaohan Lian, You Zhang, Erhong Duan
Deep eutectic solvents (DES) are generally composed of two or three cheap and safe components that are associated with each other via hydrogen bonds. The formation Caprolactam (CPL)-tetraalkyl ammonium halide (TAAX) DES and its hydrate were investigated using React IR. TAAX was introduced to CPL in the molten state at 353.15 K, the intermolecular H-N-C=O⋯H-N-C=O hydrogen bonds (CPL dimer) transfer to X- ⋯H-N-C=O (CPL-TAAX DES). When water was added to CPL-TAAX DES, intermolecular X- ⋯H-N-C=O⋯H-O-H hydrogen bonds appeared, and CPL-TAAX DES hydrate was formed...
December 5, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Maryam Rajabi, Nooshin Ghassab, Maryam Hemmati, Alireza Asghari
For the first time, three phase hollow fiber liquid phase microextraction using an influential, and green middle phase comprised a new relatively-hydrophobic deep eutectic solvent (three-phase HF-LPME-DES) was developed for trace analyses of antiarrhythmic drugs in biological and environmental samples. The extraction solvent was easily synthesized by mixing the green and cheap raw materials, namely choline chloride and 1-phenylethanol (ChCl: Ph-ETOH), in the ambient temperature. Good compatibility to pores of hollow-fiber, high ability for extraction of ionizable organic compounds with no need to any carrier agents, and easy availability in the laboratory environment turned this new proposed deep eutectic intermediate to a worthy generation of the supported liquid membrane (SLM)...
November 7, 2018: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Lorenzo Gontrani, Matteo Bonomo, Natalia V Plechkova, Danilo Dini, Ruggero Caminiti
In this study, we report the structural, thermodynamic and electrochemical properties of deep eutectic solvents (DESs) formed from choline chloride and oxalic acid in anhydrous and di-hydrated form in a 1 : 1 molar ratio. As far as we are aware, this is the first joint X-ray diffraction-molecular dynamics study focussed on analyzing the structural features of DESs.
December 5, 2018: Physical Chemistry Chemical Physics: PCCP
Tasneem Gul Kazi, Hassan Imran Afridi, Murk Bhatti, Asma Akhtar
An innovative ultrasonic assisted microextraction method using a deep eutectic solvent for entrapping the organ metallic complexes was developed to pre-concentrate the trace quantities of cadmium (Cd) and lead (Pb) in lipsticks and eye shadows of different brands prior to flame atomic absorption spectrometry analysis. A deep eutectic solvent (DES) was used in this study, prepared by mixing metal salt (ZnCl2 ) and hydrogen bond donors such as (acetamide) in different ratio. The different branded cosmetic items, lipstick and eye shadows, obtained from local market and subjected to acid digestion prior to application of proposed ultrasonic assisted microextraction method based on deep eutectic solvent (UAµE-DES) with the aid of mechanical and ultrasound energies...
March 2019: Ultrasonics Sonochemistry
Manuela Panić, Doris Delač, Marin Roje, Ivana Radojčić Redovniković, Marina Cvjetko Bubalo
OBJECTIVE: Chiral building blocks [(S)-1-(3-methylphenyl)ethanol, (S)-1-(3,4-dimethylphenyl)ethanol and (S)-1-(2,4,6-trimethylphenyl)ethanol] for drug synthesis were prepared using two green approaches: (1) the yeast Saccharomyces cerevisiae as the biocatalyst and (2) the natural deep eutectic solvents (NADES) as the alternative solvents. Three different NADES with different water contents were prepared and screened for the highest conversion and enantiomeric excess of reduction of 1-(3-methylphenyl)ethanone, 1-(3,4-dimethylphenyl)ethanone (DMPA) and 1-(2,4,6-trimethyphenyl)ethanone by S...
December 3, 2018: Biotechnology Letters
Wenqi Li, Kirtley Amos, Mi Li, Yunqiao Pu, Seth Debolt, Arthur J Ragauskas, Jian Shi
Background: Lignin is a promising source of building blocks for upgrading to valuable aromatic chemicals and materials. Endocarp biomass represents a non-edible crop residue in an existing agricultural setting which cannot be used as animal feed nor soil amendment. With significantly higher lignin content and bulk energy density, endocarps have significant advantages to be converted into both biofuel and bioproducts as compared to other biomass resources. Deep eutectic solvent (DES) is highly effective in fractionating lignin from a variety of biomass feedstocks with high yield and purity while at lower cost comparing to certain ionic liquids...
2018: Biotechnology for Biofuels
Nadia Guajardo, Rodrigo A Schrebler, Pablo Domínguez de María
This work explores for the first time the use of Deep Eutectic Solvents (DES) with phosphate buffer 100 mM pH 7 as cosolvent (10% v/v) in biocatalytic reactions in fed-batch and packed-bed bioreactors. The lipase-catalyzed esterification of glycerol and benzoic acid is studied, as it involves two substrates with different polarities (for which DES are needed). In the fed-batch bioreactor, the highest conversion (90%) was obtained at a substrate flow rate of 0.01 mL/min. The fed-batch operation increased the conversion by 59% compared to the batch mode...
November 9, 2018: Bioresource Technology
Hamid Beyzaei, Mahboubeh Kamali Deljoo, Reza Aryan, Behzad Ghasemi, Mohammad Mehdi Zahedi, Mohammadreza Moghaddam-Manesh
BACKGROUND: Design and synthesis of new inhibitor agents to deal with pathogenic microorganisms is expanding. In this project, an efficient, environmentally friendly, economical, rapid and mild procedure was developed for the synthesis of novel functionalized isoxazole derivatives as antimicrobial potentials. METHODS: Multicomponent reaction between malononitrile (1), hydroxylamine hydrochloride (2) and different aryl or heteroaryl aldehydes 3a-i afforded novel 5-amino-isoxazole-4-carbonitriles 4a-i in good product yields and short reaction times...
November 15, 2018: Chemistry Central Journal
Karina Fraige, R Dario Arrua, Adam T Sutton, Cristiano Soleo Funari, Alberto José Cavalheiro, Emily F Hilder, Vanderlan da Silva Bolzani
Natural deep eutectic solvents have been used as an alternative to organic solvents for the extraction of plants metabolites, allowing for the extraction of compounds of different polarities, while being inexpensive, non-toxic, and easy to prepare. This work presents the comparison of the chromatographic profiles by high-performance liquid chromatography with diode-array detection obtained from Byrsonima intermedia (Malpighiaceae) using five choline chloride-based natural deep eutectic solvents, in addition to the most used traditional extraction solvents, methanol/water 7:3 and ethanol/water 7:3 v/v...
November 14, 2018: Journal of Separation Science
Yongjing Liu, Hua Zhang, Hongmin Yu, Suhua Guo, Dawei Chen
INTRODUCTION: In the present study, a green and efficient extraction method using deep eutectic solvents as extraction solvent was developed for extracting the four major active compounds narirutin, naringin, hesperidin and neohesperidin from Aurantii Fructus. METHODOLOGY: A series of tunable deep eutectic solvents were prepared and investigated by mixing choline chloride or betaine to different hydrogen-bond donors, and betaine/ethanediol was found to be the most suitable extraction solvent...
November 13, 2018: Phytochemical Analysis: PCA
Laura J B M Kollau, Mark Vis, Adriaan van den Bruinhorst, A Catarina C Esteves, Remco Tuinier
Deep eutectic solvents (DESs) have been considered as a new class of green solvents with tunable physical properties based on the selective combination of their individual components. As the liquid window of a DES identifies the range of feasible applications, it is essential to determine, quantify, and predict their phase behavior. Phase diagrams were measured for systems consisting of tetrapentylammonium bromide and erythritol or succinic acid. Regular solution theory is applied to quantitatively describe the liquid window of DESs...
November 27, 2018: Chemical Communications: Chem Comm
Adam H Turner, Doseok Kim
The equilibrium and dynamic solvation responses of coumarin 153 (C153) in a range of deep eutectic solvents (DESs) based on choline chloride with either urea (molar ratio 1:2, ChCl:U), glycerol (1:2, ChCl:G), ethylene glycol (1:2, ChCl:E), or malonic acid (1:1, ChCl:Mal) were investigated using both steady-state and time-resolved fluorescence emission spectroscopy at room temperature (298 K). From steady-state fluorescence data, "red-edge effects" were observed in all the DESs studied, attributed to spatial heterogeneity of the DES matrix...
November 7, 2018: Journal of Chemical Physics
Amrita Banerjee, Kelly Ibsen, Tyler Brown, Renwei Chen, Christian Agatemor, Samir Mitragotri
No abstract text is available yet for this article.
November 6, 2018: Proceedings of the National Academy of Sciences of the United States of America
Wenwen Deng, Long Yu, Xiao Li, Jia Chen, Xuanxuan Wang, Zixin Deng, Yuxiu Xiao
A series of new hydrophobic deep eutectic solvents (DESs), which are liquid at room temperature and have high density (>1.4 g mL-1 ), were synthesized using hexafluoroisopropanol (HFIP) as hydrogen-bond donor and l-carnitine/betaine as hydrogen-bond acceptor. Then these hydrophobic DESs were used as extraction solvents to establish dispersive liquid-liquid microextraction (DLLME) method for extraction of pyrethroids. The DES extraction phase was in the bottom after DLLME, being easy to be collected for analysis...
February 15, 2019: Food Chemistry
Kaige Zhang, Shuangying Li, Chuang Liu, Qi Wang, Yunhe Wang, Jing Fan
In recent years, hydrophobic deep eutectic solvents as new generation of green solvents have attracted wide attention in liquid microextraction technique. In this article, four hydrophobic deep eutectic solvents composed of trioctylmethylammonium chloride and oleic acid were designed and prepared firstly. Combined with high-performance liquid chromatography, these deep eutectic solvents were used as an extraction solvent in vortex-assisted dispersive liquid-liquid microextraction for the selective enrichment and indirect determination of trace nitrite from real water and biological samples...
October 29, 2018: Journal of Separation Science
Jonna Ojala, Miikka Visanko, Ossi Laitinen, Monika Österberg, Juho Antti Sirviö, Henrikki Liimatainen
In this experiment, the influence of the morphology and surface characteristics of cellulosic nanoparticles (i.e., cellulose nanocrystals [CNCs] and cellulose nanofibers [CNFs]) on oil-in-water ( o / w ) emulsion stabilization was studied using non-modified or functionalized nanoparticles obtained following deep eutectic solvent (DES) pre-treatments. The effect of the oil-to-water ratio (5, 10, and 20 wt.-% (weight percent) of oil), the type of nanoparticle, and the concentration of the particles (0.05⁻0...
October 25, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Xiao Liu, Najing Fu, Qiangguo Zhang, Shuaifang Cai, Qiong Wang, Dandan Han, Baokun Tang
To address the problem of high viscosity of deep eutectic solvents (DESs), the viscosities of a series of choline chloride-based DESs and DESs-H2O were determined, and their extraction efficiencies were obtained for the extraction of polyphenols in palm samples. Tailoring the DESs by the addition of water successfully adjusted their viscosity from thousand to single-digit mPa s and aided the extraction of polyphenols from samples, by changing the hydrogen-bonding interactions of DESs. Among the compounds investigated, choline chloride-oxalic acid-water of DESs-H2O with various molar ratios with 1:0...
October 26, 2018: Journal of Chromatographic Science
Yu-Gang Shi, Yun-Jie Zhu, Shi-Yin Shao, Run-Run Zhang, Yu Wu, Chen-Min Zhu, Xian-Rui Liang, Wen-Qiang Cai
This work aims to prepare ferulic acid alkyl esters (FAEs) through the lipase-catalyzed reaction between methyl ferulate and various fatty alcohols in deep eutectic solvents and ascertain their antibacterial activities and mechanisms. Screens of antibacterial effects of FAEs against Escherichia coli ATCC 25922 ( E. coli) and Listeria monocytogenes ATCC 19115 ( L. monocytogenes) revealed that hexyl ferulate (FAC6) exerted excellent bacteriostatic and bactericidal effects on E. coli and L. monocytogenes (minimum inhibitory concentration (MIC): 1...
November 14, 2018: Journal of Agricultural and Food Chemistry
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