Formation of water-in-oil microemulsions within a hydrophobic deep eutectic solvent

2021 ◽  
Author(s):  
Divya Dhingra ◽  
Kamalakanta Behera ◽  
Bhawna Bhawna ◽  
Siddharth Pandey
Keyword(s):  
Organic Solvents ◽  
Deep Eutectic Solvent ◽  
Bulk Oil

Conventional water-in-oil microemulsions are usually formed using environmentally unfavorable organic solvents as the bulk oil phase. Evidence for formation of novel water-in-oil microemulsions within a non-toxic and inexpensive hydrophobic deep...

scholarly journals Natural Deep Eutectic Solvent Extraction of Flavonoids of Scutellaria baicalensis as a Replacement for Conventional Organic Solvents

Molecules ◽  
2020 ◽  
Vol 25 (3) ◽  
pp. 617 ◽  
Author(s):  
Wim Wouter Oomen ◽  
Paloma Begines ◽  
Natali Rianika Mustafa ◽  
Erica G. Wilson ◽  
Robert Verpoorte ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Deep Eutectic Solvent ◽  
Stem Bark ◽  
Scutellaria Baicalensis ◽  
Molar Ratio ◽  
Aqueous Methanol ◽  
Oroxylin A ◽  
Flavonoid Aglycones ◽  
Natural Deep Eutectic Solvents ◽  
Wide Range

Natural deep eutectic solvents (NADES) are a type of ionic liquid (IL) or deep eutectic solvent (DES), the ingredients of which are exclusively natural products (non-toxic and environmentally friendly). Here, we explore the potential of NADES as an alternative to conventional organic solvents (e.g., aqueous methanol or ethanol) for the extraction of flavonoids from Scutellaria baicalensis stem bark to investigate their extractability depending on structural variation. Four NADES, each containing citric acid in combination with β-alanine, glucose, xylitol, or proline (at a molar ratio of 1:1), and a variable amount of water, were used to extract the flavonoid aglycones: baicalein (1), scutellarein (3), wogonin (5), and oroxylin A (7), and their glycosides, baicalin (2), scutellarin (4), wogonoside (6) and oroxyloside (8) from the powdered bark of S. baicalensis. The chemical profile and yield of the extracts were determined using HPTLC and HPLC. The extractability of individual flavonoids was found to be influenced by the concentration of water (20–60%, w/w) in the NADES. Among the tested flavonoids, the extraction yield of baicalein (1), scutellarein (3), wogonin (5), oroxylin A (7) with NADES was 2 to 6 times that of aqueous methanol. However, the amount of their corresponding glycosides (baicalin (2), wogonoside (6) and oroxyloside (8)) extracted with NADES was only 1.5–1.8 times higher than with aqueous methanol. Interestingly, the more hydrophilic glycosides were less extracted than their corresponding aglycones despite the high hydrophilicity of the NADES. These results prove that NADES may be used for extraction of compounds with a wide range of hydrophilicity.

scholarly journals Efficient extraction of bioactive flavonoids from Celtis sinensis leaves using deep eutectic solvent as green media

RSC Advances ◽  
2021 ◽  
Vol 11 (29) ◽  
pp. 17924-17935
Author(s):  
Lei Wang ◽  
Xianying Fang ◽  
Yang Hu ◽  
Yiwei Zhang ◽  
Zhipeng Qi ◽  
...  
Keyword(s):  
Natural Products ◽  
Organic Solvents ◽  
Deep Eutectic Solvent ◽  
Efficient Extraction ◽  
Celtis Sinensis

In recent years, deep eutectic solvent (DES) has attracted comprehensive attention on the extraction of natural products, and is regarded as an alternative to traditional organic solvents for the environmental advantages.

scholarly journals Zein nanofibers via deep eutectic solvent electrospinning: tunable morphology with super hydrophilic properties

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Muzamil Khatri ◽  
Zeeshan Khatri ◽  
Sofia El-Ghazali ◽  
Nadir Hussain ◽  
Umair Ahmed Qureshi ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Biomedical Applications ◽  
Leaf Morphology ◽  
Polymer Concentration ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Average Diameter ◽  
Hydrophilic Character ◽  
Tunable Morphology

Abstract The use of organic solvents for the preparation of nanofibers are challenged due to their volatile and hazardous behavior. Recently deep eutectic solvents (DES) are widely recognized as non-volatile and non-hazardous solvents which never been utilized directly for nanofabrication via electrospinning. Here, we present the preparation of Zein nanofibers using deep eutectic solvents (DES-Zein). The DES-Zein nanofibers were produced at an optimized polymer concentration of 45% (w/w) with pH 7.3 and electroconductivity 233 mS cm−1. DES-Zein nanofibers showed aligned to tweed like cedar leaf morphology tuned by varying the spreading angle from 0° to 90°. In contrast to hydrophobic conventional Zein nanofibers, DES-Zein nanofibers showed super hydrophilic character and about 200 nm finer average diameter. The proposed method of preparing Zein nanofibers using DES opens a new door to continuous electrospinning with tunable morphology, having potential to be used for environmental and biomedical applications.

scholarly journals Hybrid Deep Eutectic Solvent of LiTFSI-Ethylene Glycol Organic Electrolyte for Activated Carbon-Based Supercapacitors

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Kieu T. Tran ◽  
Tuyen T. T. Truong ◽  
Hoang V. Nguyen ◽  
Quan D. Nguyen ◽  
Quan Phung ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Ethylene Glycol ◽  
Organic Solvents ◽  
High Performance ◽  
Ethylene Carbonate ◽  
Research Work ◽  
Deep Eutectic Solvent ◽  
Scanning Rate ◽  
Lower Viscosity ◽  
Rate Capacity

This research work demonstrates a novel hybrid electrolyte based on a deep eutectic solvent (DES) combined with organic solvents for high-performance supercapacitors. DES was formed between ethylene glycol (EG) and lithium bis((trifluoromethyl)sulfonyl) imide (LiTFSI) and diluted by ethylene carbonate (EC) or acetonitrile (AN) with different amounts (10–50% wt.). Such a combination gives superior properties for hybrid electrolytes compared to pure DESs and reduces the volatility of mixed organic solvents. Regarding the electrochemical properties, DES-AN mixtures exhibited a better performance under high applied voltage and more reversible behavior than DES-EC ones, which suffered from the increasing distance in the electrical double layer. DES 1 : 4 + 20% wt. AN exhibited favorable electrolyte properties such as high ionic conductivity (3.1 mS·cm−1 at 30oC), relatively lower viscosity (14.28 mPa s at 30oC, approximately 2 times lower thanDES pure), and quite large electrochemical stability window up to 3.4 V (at 20–30% wt. AN) compared to the baseline electrolyte (LiTFSI/TBABF4 in AN). With these interesting properties, selected hybrid electrolyte (DES 1 : 4 + 20% wt. AN) tested in the symmetric capacitor using the activated carbon offered decent capacitance (15 F·g−1 at 3.4 V with a scanning rate of 1 A·g−1 and remains around 95% after 100 cycles) and good charge-discharge durability (>80% retention after 2000 cycles), especially the EDLC with DES 1 : 4 + 20% wt. AN shows good rate capacity (13.2 F·g−1 at 2 A·g−1, remaining 6 F·g−1 at 10 A·g−1).

Recovery of metabolites from natural deep eutectic solvent matrices by countercurrent separation

Planta Medica ◽  
2015 ◽  
Vol 81 (11) ◽  
Author(s):  
Y Liu ◽  
J Garzon ◽  
JB Friesen ◽  
DC Lankin ◽  
JB McAlpine ◽  
...  
Keyword(s):  
Deep Eutectic Solvent ◽  
Natural Deep Eutectic Solvent

UNTERSUCHUNGEN ÜBER DIE EXTRAKTION DES ROTEN KOBER-FARBSTOFFS DURCH ORGANISCHE LÖSUNGSMITTEL ZUR ÖSTROGENBESTIMMUNG IM HARN

1960 ◽  
Vol XXXV (I) ◽  
pp. 34-48 ◽  
Author(s):  
Gerd Ittrich
Keyword(s):  
Menstrual Cycle ◽  
Organic Solvents ◽  
Urine Sample ◽  
Phenol Derivatives ◽  
Organische Lösungsmittel ◽  
Colour Complex

ABSTRACT A series of organic solvents and phenol derivatives have been examined for the extraction of the pink Kober-colour complex. Optimal results could be achieved for fluorimetry by a solution of 2 % (w/v) p-nitrophenol and 1 % (v/v) ethanol in acetylenetetrabromide, when the green mercury line (546 mμ was used as primary light. The sensitivity, stability and specificity have been improved, compared with the previously described reaction. By changing the sequence of purification steps and by reducing the volume of the urine sample (5 ml) the method for the determination of total oestrogens has been simplified. Approximately 10 determinations can be done within 3–4 hours by one person. Recovery experiments and comparative determinations with a previously described method have been carried out. The excretion of total oestrogens in a complete menstrual cycle is determined with the described method.

Imidazole Promoted Efficient Anomerization of β-D-Glucose Pentaacetate in Organic Solutions and Solid State

2019 ◽  
Author(s):  
Meifeng Wang ◽  
Liyin Zhang ◽  
Yiqun Li ◽  
Liuqun Gu
Keyword(s):  
Solid State ◽  
Organic Solvents ◽  
Room Temperature ◽  
Materials Design ◽  
The Future ◽  
Organic Solutions ◽  
Glucose Pentaacetate

<p></p>Anomerization of glycosides were rarely performed under basic condition due to lack of efficiency. Here an imidazole promoted anomerization of β-D-glucose pentaacetate was developed; and reaction could proceed in both organic solvents and solid state at room temperature. Although mechanism is not yet clear, this unprecedent mild anomerization in solid state may open a new promising way for stereoseletive anomerization of broad glucosides and materials design in the future..

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