Deep eutectic–water binary solvent associations investigated by vibrational spectroscopy and chemometrics

2018 ◽  
Vol 20 (27) ◽  
pp. 18463-18473 ◽  
Author(s):  
R. Ahmadi ◽  
B. Hemmateenejad ◽  
A. Safavi ◽  
Z. Shojaeifard ◽  
A. Shahsavar ◽  
...  
Keyword(s):  
Vibrational Spectroscopy ◽  
Deep Eutectic Solvents ◽  
Binary Solvent ◽  
Green Solvents

Investigation of the behaviour of deep eutectic solvents as novel green solvents in the presence of other solvents is of great interest.

Strategies for metal colloidal nancrystal synthesis in sustainable media

2019 ◽  
Author(s):  
◽  
Nakara Bhawawet
Keyword(s):  
Deep Eutectic Solvents ◽  
Chemical Processes ◽  
Green Solvents ◽  
University Of Missouri ◽  
Synthetic Strategy ◽  
Metal Colloid ◽  
Gold Precursor ◽  
Nanocrystal Synthesis ◽  
Sustainable Media ◽  
Colloid Synthesis

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Over the past decades, the Green Chemistry and Sustainability concept has aroused researchers to denounce their traditional ways of thinking regarding chemical processes to address the challenges relevant to global environmental concerns. The concept has demonstrated how fundamental scientific methodologies can protect human health and the environment in an economically beneficial manner. In academia and industry, the use of green solvents, such as water, supercritical fluids, ionic liquids (ILs) and deep eutectic solvents (DESs), has then become desirable in chemical processes. In the field of green nanochemistry, ILs and DESs have acquired courtesy as sustainable media for nanomaterials synthesis. There have been attempts to employ such eco-friendly fluids to synthesize, and additionally, control size and shapes of nanomaterials, where the field has been gaining intense interests as the morphology dictates the properties and functionalities of such nanomaterials. This dissertation reports strategies for metal colloidal nanocrystal synthesis in sustainable media and aims to build a foundation for understanding how to tailor eco-friendly IL and DES fluids to control the growth of metal nanocrystals. Chapter 1 explores research reporting strategies used for metal colloid synthesis in ILs and DESs. In Chapter 2, we have developed a strategy to replace a common organic solvent with an IL to prepare monodisperse gold nanoparticles (AuNPs) by a very fast microwave method. The pyrrolidinium IL used in the work demonstrates its capability to be efficiently recovered and reused for carrying out nanoscale synthesis iteratively. The work highlights the incompatibility of imidazolium ILs for the select nanoscale synthetic strategy. For Chapter 3, we have demonstrated a control over nanoparticle size and shape generated at an aqueous-organic interface. We have shown that an interfacial photoreduction leads to the production of spherical and wire-like nanostructures, respectively, when the IL employed involves a coordinated and non-coordinated IL anion, respectively. Next, Chapter 4 has focused on exploitation of a purposefully designed IL-inspired surfactant, acting dually as a reducing and stabilizing agent, for facile and controllable AuNP formation. The reported synthetic method is simple and rapid, using only a gold precursor and the surfactant. Coinage AuNPs can be obtained very fast, while predominantly triangular-shaped AuNPs can also be achieved by tuning parameters, such as the ratio of surfactant to the gold precursor, temperature, implementing a time delay before heating, and an addition of a directing agent. Finally, Chapter 5 outlines zwitterionic deep eutectic solvents (ZDESs) as novel media for metal nanocrystal synthesis, to expand portfolio of available DESs as the field is relatively new compared to that of IL.

scholarly journals Green aqueous biphasic systems containing deep eutectic solvents and sodium salts for the extraction of protein

RSC Advances ◽  
2017 ◽  
Vol 7 (78) ◽  
pp. 49361-49367 ◽  
Author(s):  
Jingyu Pang ◽  
Xiaofang Sha ◽  
Yanhong Chao ◽  
Guangying Chen ◽  
Changri Han ◽  
...  
Keyword(s):  
Deep Eutectic Solvents ◽  
Green Solvents ◽  
Sodium Salts ◽  
Aqueous Biphasic Systems ◽  
New Type ◽  
Aqueous Biphasic ◽  
Biphasic Systems

Deep eutectic solvents (DESs), a new type of green solvents, were applied for the extraction of proteins with aqueous biphasic systems (ABSs) in this study.

scholarly journals Investigation of Base-free Copper-Catalysed Azide–Alkyne Click Cycloadditions (CuAAc) in Natural Deep Eutectic Solvents as Green and Catalytic Reaction Media

2021 ◽  
Author(s):  
Salvatore V. Giofrè ◽  
Matteo Tiecco ◽  
Angelo Ferlazzo ◽  
Roberto Romeo ◽  
Gianluca Ciancaleoni ◽  
...  
Keyword(s):  
Low Temperatures ◽  
Materials Science ◽  
Cycloaddition Reaction ◽  
Deep Eutectic Solvents ◽  
Green Solvents ◽  
Experimental Conditions ◽  
Active Reaction ◽  
Natural Deep Eutectic Solvents ◽  
Catalytic Intermediates ◽  
Reaction Media

<p>The click cycloaddition reaction of azides and alkynes affording 1,2,3-triazoles is a widely used and effective chemical transformation, applied to obtain relevant products in medicine, biology and materials science. In this work, a set of Natural Deep Eutectic Solvents (NADESs) as green and “active” reaction media, has been investigated in the copper-catalysed azide–alkyne cycloaddition reactions (CuAAc). The use of these innovative solvents has shown to improve the reaction effectiveness, giving excellent yields. NADESs proved to be “active” in these transformations for the absence of added bases in all the performed reactions and in several cases, for their reducing capabilities. The reactions outcomes were rationalized by DFT calculations which demonstrated the involvement of H-bonds between DESs and alkynes as well as a stabilization of copper catalytic intermediates. The green experimental conditions, namely the absence of a base, the low temperatures, the lowering of reagents and the possibility of recycling of the green solvents, outline the great potential of NADESs for CuAAc and in general, for green organic synthesis. </p>

From Phase Change Materials to Green Solvents: Hydrophobic Low Viscous Fatty Acid–Based Deep Eutectic Solvents

2018 ◽  
Vol 6 (3) ◽  
pp. 3888-3895 ◽  
Author(s):  
Catarina Florindo ◽  
Leila Romero ◽  
Ignacio Rintoul ◽  
Luís C. Branco ◽  
Isabel M. Marrucho
Keyword(s):  
Fatty Acid ◽  
Phase Change ◽  
Phase Change Materials ◽  
Deep Eutectic Solvents ◽  
Green Solvents

scholarly journals Recent Progress of Cu-Catalyzed Azide-Alkyne Cycloaddition Reactions (CuAAC) in Sustainable Solvents: Glycerol, Deep Eutectic Solvents, and Aqueous Media

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2015 ◽  
Author(s):  
Noel Nebra ◽  
Joaquín García-Álvarez
Keyword(s):  
Recent Progress ◽  
Copper Catalyst ◽  
Aqueous Media ◽  
Deep Eutectic Solvents ◽  
Dipolar Cycloaddition ◽  
Green Solvents ◽  
Sustainable Solvents ◽  
Volatile Organic ◽  
Water Glycerol ◽  
Reaction Media

This mini-review presents a general overview of the progress achieved during the last decade on the amalgamation of CuAAC processes (copper-catalyzed azide-alkyne cycloaddition) with the employment of sustainable solvents as reaction media. In most of the presented examples, the use of water, glycerol (Gly), or deep eutectic solvents (DESs) as non-conventional reaction media allowed not only to recycle the catalytic system (thus reducing the amount of the copper catalyst needed per mole of substrate), but also to achieve higher conversions and selectivities when compared with the reaction promoted in hazardous and volatile organic solvents (VOCs). Moreover, the use of the aforementioned green solvents also permits the improvement of the overall sustainability of the Cu-catalyzed 1,3-dipolar cycloaddition process, thus fulfilling several important principles of green chemistry.

scholarly journals Facilely reducing recalcitrance of lignocellulosic biomass by a newly developed ethylamine-based deep eutectic solvent for biobutanol fermentation

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Guochao Xu ◽  
Hao Li ◽  
Wanru Xing ◽  
Lei Gong ◽  
Jinjun Dong ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Lactic Acid ◽  
Lignocellulosic Biomass ◽  
Fossil Fuels ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Specific Yield ◽  
Green Solvents ◽  
Hydrogen Bond Donor ◽  
Total Sugars

Abstract Background Biobutanol is promising and renewable alternative to traditional fossil fuels and could be produced by Clostridium species from lignocellulosic biomass. However, biomass is recalcitrant to be hydrolyzed into fermentable sugars attributed to the densely packed structure by layers of lignin. Development of pretreatment reagents and processes for increasing surface area, removing hemicellulose and lignin, and enhancing the relative content of cellulose is currently an area of great interest. Deep eutectic solvents (DESs), a new class of green solvents, are effective in the pretreatment of lignocellulosic biomass. However, it remains challenging to achieve high titers of total sugars and usually requires combinatorial pretreatment with other reagents. In this study, we aim to develop novel DESs with high application potential in biomass pretreatment and high biocompatibility for biobutanol fermentation. Results Several DESs with betaine chloride and ethylamine chloride (EaCl) as hydrogen bond acceptors were synthesized. Among them, EaCl:LAC with lactic acid as hydrogen bond donor displayed the best performance in the pretreatment of corncob. Only by single pretreatment with EaCl:LAC, total sugars as high as 53.5 g L−1 could be reached. Consecutive batches for pretreatment of corncob were performed using gradiently decreased cellulase by 5 FPU g−1. At the end of the sixth batch, the concentration and specific yield of total sugars were 58.8 g L−1 and 706 g kg−1 pretreated corncob, saving a total of 50% cellulase. Utilizing hydrolysate as carbon source, butanol titer of 10.4 g L−1 was achieved with butanol yield of 137 g kg−1 pretreated corncob by Clostridium saccharobutylicum DSM13864. Conclusions Ethylamine and lactic acid-based deep eutectic solvent is promising in pretreatment of corncob with high total sugar concentrations and compatible for biobutanol fermentation. This study provides an efficient pretreatment reagent for facilely reducing recalcitrance of lignocellulosic materials and a promising process for biobutanol fermentation from renewable biomass.

scholarly journals Extraction of Illegal Dyes from Red Chili Peppers with Cholinium-Based Deep Eutectic Solvents

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Shuqiang Zhu ◽  
Dongling Liu ◽  
Xinyue Zhu ◽  
Along Su ◽  
Haixia Zhang
Keyword(s):  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Raw Material ◽  
Extraction Time ◽  
Solvent Ratio ◽  
Extraction Temperature ◽  
Green Solvents ◽  
Hydrogen Bond Donor ◽  
Relative Standard ◽  
Orange G

Deep eutectic solvents (DESs) as a new kind of green solvents have been used to extract bioactive compounds but there are few applications in extracting chrysoidine dyes. In this study, we developed an ultrasonic-assisted extraction method with choline chloride/hydrogen bond donor (ChCl/HBD) DES for the extraction of chrysoidine G (COG), astrazon orange G (AOG), and astrazon orange R (AOR) in food samples. Some experimental parameters, such as extraction time, raw material/solvent ratio, and temperature, were evaluated and optimized as follows: the ratio of ChCl/HBD, 1 : 2 (v/v); the ratio of sample/DES, 1 : 10 (g/mL); extraction time, 20 min; extraction temperature, 50°C. Under the optimized conditions, the limits of detection (μg/mL) were 0.10 for COG and 0.06 for AOG and AOR. The relative standard deviations were in the range of 1.2–2.1%. The recoveries of the three dyes were in the range of 80.2–105.0%. By comparing with other commonly used solvents for extracting chrysoidine dyes, the advantages of DESs proved them to be potential extraction solvents for chrysoidine G, astrazon orange G, and astrazon orange R in foods.

Potential applications of deep eutectic solvents in natural gas sweetening for CO2 capture

2017 ◽  
Vol 33 (6) ◽  
Author(s):  
Tayeb Aissaoui ◽  
Inas M. AlNashef ◽  
Umair A. Qureshi ◽  
Yacine Benguerba
Keyword(s):  
Carbon Dioxide ◽  
Natural Gas ◽  
Co2 Capture ◽  
Low Cost ◽  
Deep Eutectic Solvents ◽  
Industrial Processes ◽  
Green Solvents ◽  
Gas Sweetening ◽  
Potential Applications ◽  
Natural Gas Sweetening

AbstractNovel solvents named deep eutectic solvents (DESs) have been intensively investigated in recent years. Their non-toxicity, biodegradability, low volatility, easy preparation and low cost make them promising green solvents for several industrial processes. This article provides a status review of the possible applications of DESs in natural gas (NG) sweetening by carbon dioxide (CO

Efficient extraction of major catechins in Camellia sinensis leaves using green choline chloride-based deep eutectic solvents

RSC Advances ◽  
2015 ◽  
Vol 5 (114) ◽  
pp. 93937-93944 ◽  
Author(s):  
Ji Li ◽  
Zhigang Han ◽  
Yongpeng Zou ◽  
Bo Yu
Keyword(s):  
Organic Acids ◽  
Camellia Sinensis ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Green Solvents ◽  
Efficient Extraction

Choline chloride-based deep eutectic solvents (DESs), composed of alcohols, organic acids and saccharides, were used as green solvents for extraction of major catechins inCamellia sinensisleaves.

scholarly journals Deep eutectic solvents aqueous two-phase system based ultrasonically assisted extraction of ursolic acid (UA) from Cynomorium songaricum Rupr.

2017 ◽  
Author(s):  
Xifeng Zhang ◽  
Ji Zhang
Keyword(s):  
Ursolic Acid ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Selective Extraction ◽  
Phase System ◽  
Green Solvents ◽  
Active Components ◽  
Two Phase ◽  
Solid Ratio

Deep eutectic solvents (DESs) are new green solvents that have attracted the attention of the scientific community mainly due to their unique properties and special characteristics, which are different from those of traditional solvents.A method based on ultrasonically assisted deep eutectic solvent aqueous two-phase systems( UAE-DES-ATPS) was developed for extracting ursolic acid (UA) from Cynomorium songaricum Rupr. Four different types of choline chloride-based DESs were prepared.Choline chloride-glucose (ChCl-Glu) exhibited good selective extraction ability. An optimum DES-ATPS of 36% (w/w) ChCl-Glu and 25% (w/w) K2HPO4 was considered to be a satisfactory system for extracting UA. Response surface methodology (RSM) method was used to optimize the extraction of UA using UAE-DES-ATPS. The optimum ultrasound-assisted conditions were as follows: solvent to solid ratio of 15:1 (g/g), ultrasound power of 470 W, and extraction time of 54 min. Compared with the conventional UAE method, the yields were basically the same, but the presented method had higher purity. The structure of UA did not change between pure UA and UA in the upper phase by UV–vis and FT-IR. This approach using ChCl-based DES-ATPS as a novel extraction system and ultrasound as a source of energy provided better choice for the separation of active components from other natural products.

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