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.

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.

scholarly journals Structural and Transport Properties of Binary Mixtures of Deep Eutectic Solvent (Ethaline) with Primary Alcohols: A Molecular Dynamics Study

2021 ◽  
Author(s):  
kishant kumar ◽  
Anand Bharti ◽  
Aditya Sinha
Keyword(s):  
Molecular Dynamics ◽  
Transport Properties ◽  
Binary Mixtures ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Md Simulations ◽  
Molar Ratio ◽  
Green Solvents ◽  
Primary Alcohols

<table><tr><td>Deep eutectic solvents (DESs) are classified as the green solvents which are considered as an alternative to volatile organic solvents. In this work, the thermophysical, structural and transport properties of binary mixtures of DES ethaline (choline chloride (ChCl) + ethylene glycol (etgly) at a molar ratio of 1:2) with primary alcohols (methanol/ethanol) are studied using molecular dynamics (MD) simulations</td></tr></table> <br>

scholarly journals Deep Eutectic Solvent Dyeing of Cellulose Acetate Nanofibers With Disperse Dyes: Kinetics, Isotherm and Thermodynamic Studies

2021 ◽  
Author(s):  
Muhammad Tarique ◽  
Winges Fatima ◽  
Faraz Khan Mahar ◽  
Min Li ◽  
Jing Gu ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Color Index ◽  
Choline Chloride ◽  
Short Interval ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Disperse Dyes ◽  
Green Solvents ◽  
Distinctive Features ◽  
Dyeing Process

Abstract Deep Eutectic Solvents (DES) was introduced more than a decade ago and has been used in variety of applications based on their unique chemical and physical properties. Recently, they have shown a considerable attention in various sectors including nanotechnology because they have distinctive features as “New green solvents”. Within this scope of work, we introduced choline chloride (CC) as a DES which is nontoxic, inexpensive and has tendency to improve color yield properties of disperse dyes on the nanofibers membrane. Cellulose acetate nanofibers (CANF) were electrospun and dyed with Color Index Disperse Red 277, Color Index Disperse Blue 165:1, and Color Index Disperse Yellow 211 in Choline chloride:Ethylene glycol (CC:EG) media and Choline chloride:Urea (CC:Urea) media by using high-temperature exhaust method. Results revealed that dyeing of CANF by CC:EG media has good color fixation properties than CC:Urea media. The dyed samples were characterized by FTIR and SEM. Further, the thermodynamic, standard affinities, and kinetic parameters have also been analyzed. The proposed dyeing of CANF with DES showed excellent calorimetric properties within a short interval of time as compared to conventional dyeing process.

scholarly journals Structural and Transport Properties of Binary Mixtures of Deep Eutectic Solvent (Ethaline) with Primary Alcohols: A Molecular Dynamics Study

2021 ◽  
Author(s):  
kishant kumar ◽  
Anand Bharti ◽  
Aditya Sinha
Keyword(s):  
Molecular Dynamics ◽  
Transport Properties ◽  
Binary Mixtures ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Deep Eutectic Solvents ◽  
Md Simulations ◽  
Molar Ratio ◽  
Green Solvents ◽  
Primary Alcohols

<table><tr><td>Deep eutectic solvents (DESs) are classified as the green solvents which are considered as an alternative to volatile organic solvents. In this work, the thermophysical, structural and transport properties of binary mixtures of DES ethaline (choline chloride (ChCl) + ethylene glycol (etgly) at a molar ratio of 1:2) with primary alcohols (methanol/ethanol) are studied using molecular dynamics (MD) simulations</td></tr></table> <br>

scholarly journals Environmentally-Friendly Extraction of Flavonoids from Cyclocarya paliurus (Batal.) Iljinskaja Leaves with Deep Eutectic Solvents and Evaluation of Their Antioxidant Activities

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2110 ◽  
Author(s):  
Xianchao Shang ◽  
Jia-Neng Tan ◽  
Yongmei Du ◽  
Xinmin Liu ◽  
Zhongfeng Zhang
Keyword(s):  
Antioxidant Activities ◽  
Choline Chloride ◽  
Radical Scavenging ◽  
Deep Eutectic Solvent ◽  
Environmentally Friendly ◽  
Deep Eutectic Solvents ◽  
Selective Extraction ◽  
Molar Ratio ◽  
Cyclocarya Paliurus

Deep eutectic solvents (DESs) are commonly employed as environmentally-friendly solvents in numerous chemical applications owing to their unique physicochemical properties. In this study, a novel and environmentally-friendly extraction method based on ultrasound assisted-deep eutectic solvent extraction (UAE-DES) was investigated for the extraction of flavonoids from Cyclocarya paliurus (Batal.) Iljinskaja (C. paliurus) leaves, and the antioxidant activities of these flavonoids were evaluated. Nine different DES systems based on either two or three components were tested, and the choline chloride/1,4–butanediol system (1:5 molar ratio) was selected as the optimal system for maximizing the flavonoid extraction yields. Other extraction conditions required to achieve the maximum flavonoid extraction yields from the leaves of C. paliurus were as follows: DES water content (v/v), 30%; extraction time, 30 min; temperature, 60 °C; and solid-liquid ratio, 20 mg/mL. Liquid chromatography-mass spectrometry allowed the detection of five flavonoids in the extract, namely kaempferol-7-O-α-l-rhamnoside, kaempferol, quercetin, quercetin-3-O-β-d-glucuronide, and kaempferol-3-O-β-d-glucuronide. In vitro antioxidant tests revealed that the flavonoid-containing extract exhibited strong DPPH and ABTS radical-scavenging abilities. Results indicate that UAE-DES is a suitable approach for the selective extraction of flavonoids from C. paliurus leaves, and DESs can be employed as sustainable extraction media for other bioactive compounds.

scholarly journals Preparation of 5-HMF in a DES/Ethyl N-Butyrate Two-Phase System

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 636
Author(s):  
Jinyan Lang ◽  
Junliang Lu ◽  
Ping Lan ◽  
Na Wang ◽  
Hongyan Yang ◽  
...  
Keyword(s):  
Cellulose Degradation ◽  
Choline Chloride ◽  
Deep Eutectic Solvent ◽  
Product Yield ◽  
Homogeneous System ◽  
Recycling Rate ◽  
Phase System ◽  
Separation System ◽  
Two Phase ◽  
Dissolution Reaction

In this paper, a two-phase system, formed by oxalic acid/choline chloride-based deep eutectic solvent (DES) and chosen extractants, was used as a dissolution–reaction–separation system, and metal chloride was used as a catalyst to study the degradation of cellulose to produce 5-hydroxymethylfurfural (5-HMF) and glucose. The effects of the amount of organic solvent and the reaction temperature on product yield, the repeated recycling of DES, the comparison between a two-phase system and a homogeneous system, and the mechanism of cellulose degradation to 5-HMF were investigated. The results show that ethyl n-butyrate has the best extraction effect on 5-HMF. Compared with the homogeneous system, the yield of 5-HMF and glucose in the two-phase system is significantly improved. At a temperature of 140 °C and a reaction time of 120 min, the yields of glucose and 5-HMF reached the maximum, which were 23.5% and 29.8%, respectively. After DES was reused three times, the yields of glucose and 5-HMF decreased greatly, indicating that the recycling rate of DES was low.

scholarly journals Efficient Purification of R-phycoerythrin from Marine Algae (Porphyra yezoensis) Based on a Deep Eutectic Solvents Aqueous Two-Phase System

Marine Drugs ◽  
2020 ◽  
Vol 18 (12) ◽  
pp. 618
Author(s):  
Yifeng Xu ◽  
Quanfu Wang ◽  
Yanhua Hou
Keyword(s):  
Driving Forces ◽  
Choline Chloride ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Porphyra Yezoensis ◽  
Deep Eutectic Solvents ◽  
Phase System ◽  
Two Phase ◽  
Native Page ◽  
Aqueous Two Phase System

R-phycoerythrin (R-PE), a marine bioactive protein, is abundant in Porphyra yezoensis with high protein content. In this study, R-PE was purified using a deep eutectic solvents aqueous two-phase system (DES-ATPS), combined with ammonium sulphate precipitation, and characterized by certain techniques. Firstly, choline chloride-urea (ChCl-U) was selected as the suitable DES to form ATPS for R-PE extraction. Then, single-factor experiments were conducted: the purity (A565/A280) of R-PE was 3.825, and the yield was 69.99% (w/w) under optimal conditions (adding 0.040 mg R-PE to ChCl-U (0.35 g)/K2HPO4 (0.8 g/mL, 0.5 mL) and extracting for 20 min). The sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) results revealed that the purified R-PE contained three main bands. One band was presented after purification in native-PAGE. The UV-vis spectra showed characteristic absorption peaks at 495, 540, and 565 nm. R-PE displayed an emission wavelength at 570 nm when excited at 495 nm. All spectra results illustrated that the structure of R-PE remained unchanged throughout the process, proving the effectiveness of this method. Transmission electron microscope (TEM) showed that aggregation and surrounding phenomena were the driving forces for R-PE extraction. This study could provide a green and simple purification method of R-PE in drug development.

Sign in / Sign up

Export Citation Format

Share Document